[インデックス 18187] ファイルの概要

このコミットは、Go言語の標準ライブラリ net/http パッケージにおけるデータ競合（data race）の問題を修正するものです。具体的には、HTTPリクエストのボディ（Request.Body）がクライアントとサーバー間で共有される際に発生する競合状態を解消し、スレッドセーフティを確保します。

コミット

commit affab3f3128558dd808247f01abfee4b2bfee712
Author: Brad Fitzpatrick <bradfitz@golang.org>
Date:   Tue Jan 7 10:40:56 2014 -0800

    net/http: fix data race when sharing request body between client and server
    
    A server Handler (e.g. a proxy) can receive a Request, and
    then turn around and give a copy of that Request.Body out to
    the Transport. So then two goroutines own that Request.Body
    (the server and the http client), and both think they can
    close it on failure.  Therefore, all incoming server requests
    bodies (always *http.body from transfer.go) need to be
    thread-safe.
    
    Fixes #6995
    
    R=golang-codereviews, r
    CC=golang-codereviews
    https://golang.org/cl/46570043

GitHub上でのコミットページへのリンク

https://github.com/golang/go/commit/affab3f3128558dd808247f01abfee4b2bfee712

元コミット内容

net/http: fix data race when sharing request body between client and server

このコミットは、クライアントとサーバー間でリクエストボディを共有する際のデータ競合を修正します。

サーバーのハンドラ（例：プロキシ）はリクエストを受け取り、その Request.Body のコピーを Transport に渡すことがあります。この場合、2つのゴルーチンが同じ Request.Body を所有することになり（サーバーとHTTPクライアント）、両方がエラー時にそれを閉じようとします。したがって、すべての受信サーバーリクエストボディ（transfer.go の *http.body）はスレッドセーフである必要があります。

Issue #6995 を修正します。

変更の背景

この変更の背景には、HTTPプロキシサーバーのようなシナリオで発生する特定のデータ競合の問題があります。

通常のHTTP通信では、クライアントがリクエストを送信し、サーバーがそれを受け取って処理します。この際、リクエストボディは通常、単一のエンティティによって消費されます。しかし、プロキシサーバーのような中間者として機能するアプリケーションでは、受信したリクエストのボディを、さらに別のバックエンドサーバーへの新しいリクエストのボディとして再利用することがあります。

この再利用の際に問題が発生します。元のリクエストボディ（サーバーが受け取ったもの）と、それをコピーして作成された新しいリクエストボディ（プロキシがバックエンドに送信するもの）は、内部的に同じ基盤となる io.Reader を参照している可能性があります。Goの net/http パッケージでは、リクエストボディは io.ReadCloser インターフェースを満たす型として扱われます。

問題は、この io.ReadCloser が複数のゴルーチンによって同時にアクセスされ、特に Close() メソッドが呼び出される可能性がある点にありました。例えば、プロキシサーバーがバックエンドへのリクエストを送信し、その途中でエラーが発生した場合、プロキシ側のクライアントはリクエストボディを閉じようとします。同時に、元のサーバー側も、リクエストの処理が完了したと判断してリクエストボディを閉じようとする可能性があります。

このように、複数のゴルーチンが同期なしに同じリソース（この場合は Request.Body の内部状態）に対して Read() や Close() を呼び出すと、データ競合が発生し、予測不能な動作、パニック、またはリソースリークにつながる可能性がありました。Issue #6995 はこの具体的な問題点を報告しており、このコミットはその修正を目的としています。

前提知識の解説

このコミットを理解するためには、以下の概念が重要です。

1. Goの並行処理とゴルーチン (Goroutines): Go言語は、軽量なスレッドであるゴルーチンを用いて並行処理をサポートします。ゴルーチンは非常に安価に生成でき、Goランタイムによってスケジューリングされます。複数のゴルーチンが同時に実行されることで、並行処理が実現されます。

2. データ競合 (Data Race): 複数のゴルーチンが、少なくとも1つが書き込み操作であるにもかかわらず、同期なしに同じメモリ位置に同時にアクセスするときに発生します。データ競合は、プログラムの動作を予測不能にし、デバッグが困難なバグ（例：パニック、不正な値、デッドロック）を引き起こす可能性があります。Goでは、go run -race コマンドでデータ競合を検出できます。

3. sync.Mutex: Goの標準ライブラリ sync パッケージが提供する相互排他ロック（mutual exclusion lock）です。Mutex は、共有リソースへのアクセスを一度に1つのゴルーチンに制限するために使用されます。Lock() メソッドでロックを取得し、Unlock() メソッドでロックを解放します。これにより、クリティカルセクション（共有リソースにアクセスするコード部分）が保護され、データ競合が防止されます。

4. io.Reader および io.ReadCloser インターフェース:

   • io.Reader インターフェースは、Read(p []byte) (n int, err error) メソッドを定義します。これは、バイトスライス p にデータを読み込み、読み込んだバイト数 n とエラー err を返します。
   • io.Closer インターフェースは、Close() error メソッドを定義します。これは、リソースを閉じ、エラーを返します。
   • io.ReadCloser インターフェースは、io.Reader と io.Closer の両方を埋め込んだインターフェースです。HTTPリクエストボディやレスポンスボディは通常、このインターフェースを満たします。

5. net/http パッケージの内部構造:

   • Request.Body: HTTPリクエストのボディを表す io.ReadCloser です。
   • http.Handler: HTTPリクエストを処理するためのインターフェースで、ServeHTTP(ResponseWriter, *Request) メソッドを定義します。
   • http.Transport: HTTPクライアントがネットワークリクエストを実行するためのメカニズムを提供します。接続の確立、リクエストの送信、レスポンスの受信などを担当します。プロキシサーバーは、この Transport を使用してバックエンドにリクエストを転送します。
   • http.body 構造体 (transfer.go 内): net/http パッケージ内部で、HTTPメッセージのボディを扱うために使用される構造体です。これは io.Reader インターフェースを実装し、ボディの読み込みとクローズのロジックをカプセル化します。このコミットの主要な変更対象となります。

6. プロキシサーバーの動作: プロキシサーバーは、クライアントからのリクエストを受け取り、それを解析し、必要に応じて変更を加えてから、別のサーバー（オリジンサーバー）に転送します。オリジンサーバーからのレスポンスを受け取ると、それをクライアントに転送します。この「転送」の過程で、受信したリクエストボディをそのまま、または一部を読み取ってから、新しいリクエストのボディとして再利用することがあります。

技術的詳細

このコミットは、net/http パッケージ内の body 構造体（src/pkg/net/http/transfer.go で定義）に sync.Mutex を導入することで、データ競合を解決します。

以前の body 構造体は、io.Reader インターフェースを直接埋め込んでいました。

type body struct {
	io.Reader
	hdr     interface{}   // non-nil (Response or Request) value means read trailer
	r       *bufio.Reader // underlying wire-format reader for the trailer
	closing bool          // is the connection to be closed after reading body?
	closed  bool
}

この構造では、Read メソッドは埋め込まれた io.Reader の Read メソッドを直接呼び出していました。また、closed フィールドは、ボディが閉じられたかどうかを示す状態変数でした。複数のゴルーチンが同時に Read や Close を呼び出すと、closed フィールドの読み書きや、基盤となるリーダーへのアクセスで競合が発生する可能性がありました。

修正後の body 構造体は以下のようになります。

type body struct {
	src     io.Reader // 埋め込まれた io.Reader を src フィールドに変更
	hdr     interface{}
	r       *bufio.Reader
	closing bool

	mu     sync.Mutex // guards closed, and calls to Read and Close
	closed bool
}

主な変更点は以下の通りです。

1. io.Reader の埋め込み解除と src フィールドの導入: 以前は io.Reader が直接埋め込まれていましたが、これを src io.Reader というフィールドに変更しました。これにより、body 構造体自身の Read メソッドを明示的に定義し、その中でロックをかけることが可能になります。

2. sync.Mutex (mu) の導入: mu sync.Mutex フィールドが追加されました。このミューテックスは、closed フィールドへのアクセスと、Read および Close メソッドの呼び出しを保護するために使用されます。

3. Read メソッドの変更: body 構造体の Read メソッドがオーバーライドされ、b.mu.Lock() と b.mu.Unlock() で囲まれるようになりました。これにより、Read メソッドが呼び出されている間は、他のゴルーチンが同時に Read や Close を呼び出すことができなくなり、データ競合が防止されます。 また、readLocked というヘルパーメソッドが導入され、ロックが取得された状態で実際の読み込み処理を行うようになりました。

   func (b *body) Read(p []byte) (n int, err error) {
   	b.mu.Lock()
   	defer b.mu.Unlock()
   	if b.closed {
   		return 0, ErrBodyReadAfterClose
   	}
   	return b.readLocked(p)
   }
   
   // Must hold b.mu.
   func (b *body) readLocked(p []byte) (n int, err error) {
   	n, err = b.src.Read(p) // src フィールドから読み込む
   	// ... 後続の処理 ...
   }
   

4. Close メソッドの変更: Close メソッドも同様に b.mu.Lock() と b.mu.Unlock() で保護されるようになりました。これにより、ボディが閉じられる操作もスレッドセーフになります。

   func (b *body) Close() error {
   	b.mu.Lock()
   	defer b.mu.Unlock()
   	if b.closed {
   		return nil
   	}
   	// ... 既存のクローズ処理 ...
   	b.closed = true
   	return err
   }
   

5. bodyLocked ヘルパー構造体の導入: io.Copy(ioutil.Discard, b) のような操作で、body 構造体自身が io.Reader として渡される場合、io.Copy は内部で Read メソッドを繰り返し呼び出します。この際、body の Read メソッド内で毎回ロックとアンロックが行われると、パフォーマンスオーバーヘッドが発生する可能性があります。 これを避けるため、bodyLocked という新しい構造体が導入されました。これは、body のミューテックスが既に保持されている状態で Read 操作を行うためのヘルパーです。io.Copy の呼び出し箇所で io.Copy(ioutil.Discard, bodyLocked{b}) のように使用されます。これにより、io.Copy は bodyLocked の Read メソッドを呼び出し、その中で body の readLocked メソッド（既にロックが取得されていることを前提とする）が呼び出されます。

   type bodyLocked struct {
   	b *body
   }
   
   func (bl bodyLocked) Read(p []byte) (n int, err error) {
   	if bl.b.closed {
   		return 0, ErrBodyReadAfterClose
   	}
   	return bl.b.readLocked(p)
   }
   

これらの変更により、http.body のインスタンスが複数のゴルーチンによって同時に読み書きまたはクローズされようとした場合でも、sync.Mutex によってアクセスが同期され、データ競合が安全に防止されるようになりました。

コアとなるコードの変更箇所

このコミットにおける主要なコード変更は、src/pkg/net/http/transfer.go ファイルに集中しています。

1. body 構造体の定義変更:

   • io.Reader の埋め込みが src io.Reader フィールドに置き換えられました。
   • mu sync.Mutex フィールドが追加されました。

   --- a/src/pkg/net/http/transfer.go
   +++ b/src/pkg/net/http/transfer.go
   @@ -14,6 +14,7 @@ import (
     	"net/textproto"
     	"strconv"
     	"strings"
   +	"sync"
     )
   
     // transferWriter inspects the fields of a user-supplied Request or Response,
   @@ -331,17 +332,17 @@ func readTransfer(msg interface{}, r *bufio.Reader) (err error) {
     	if noBodyExpected(t.RequestMethod) {
     		t.Body = eofReader
     	} else {
   -		t.Body = &body{Reader: newChunkedReader(r), hdr: msg, r: r, closing: t.Close}
   +		t.Body = &body{src: newChunkedReader(r), hdr: msg, r: r, closing: t.Close}
     	}
     case realLength == 0:
     	t.Body = eofReader
     case realLength > 0:
   -	t.Body = &body{Reader: io.LimitReader(r, realLength), closing: t.Close}
   +		t.Body = &body{src: io.LimitReader(r, realLength), closing: t.Close}
     default:
     	// realLength < 0, i.e. "Content-Length" not mentioned in header
     	if t.Close {
     		// Close semantics (i.e. HTTP/1.0)
   -		t.Body = &body{Reader: r, closing: t.Close}
   +		t.Body = &body{src: r, closing: t.Close}
     	} else {
     		// Persistent connection (i.e. HTTP/1.1)
     		t.Body = eofReader
   @@ -514,11 +515,13 @@ func fixTrailer(header Header, te []string) (Header, error) {
     // Close ensures that the body has been fully read
     // and then reads the trailer if necessary.
     type body struct {
   -	io.Reader
   +	src     io.Reader
     	hdr     interface{}   // non-nil (Response or Request) value means read trailer
     	r       *bufio.Reader // underlying wire-format reader for the trailer
     	closing bool          // is the connection to be closed after reading body?
   -	closed  bool
   +
   +	mu     sync.Mutex // guards closed, and calls to Read and Close
   +	closed bool
     }
   

2. body.Read メソッドの実装変更:

   • sync.Mutex を使用してロックとアンロックが行われるようになりました。
   • readLocked ヘルパーメソッドが導入され、実際の読み込み処理がそちらに移されました。

   --- a/src/pkg/net/http/transfer.go
   +++ b/src/pkg/net/http/transfer.go
   @@ -528,10 +531,17 @@ var ErrBodyReadAfterClose = errors.New("http: invalid Read on closed Body")
   
    func (b *body) Read(p []byte) (n int, err error) {
   +	b.mu.Lock()
   +	defer b.mu.Unlock()
    	if b.closed {
    		return 0, ErrBodyReadAfterClose
    	}
   -	n, err = b.Reader.Read(p)
   +	return b.readLocked(p)
   +}
   +
   +// Must hold b.mu.
   +func (b *body) readLocked(p []byte) (n int, err error) {
   +	n, err = b.src.Read(p)
   

3. body.Close メソッドの実装変更:

   • sync.Mutex を使用してロックとアンロックが行われるようになりました。
   • io.Copy の呼び出しが bodyLocked{b} を使用するように変更されました。

   --- a/src/pkg/net/http/transfer.go
   +++ b/src/pkg/net/http/transfer.go
   @@ -618,6 +628,8 @@ func (b *body) readTrailer() error {
    }
   
    func (b *body) Close() error {
   +	b.mu.Lock()
   +	defer b.mu.Unlock()
    	if b.closed {
    		return nil
    	}
   @@ -629,12 +641,25 @@ func (b *body) Close() error {
    	default:
    		// Fully consume the body, which will also lead to us reading
    		// the trailer headers after the body, if present.
   -		_, err = io.Copy(ioutil.Discard, b)
   +		_, err = io.Copy(ioutil.Discard, bodyLocked{b})
    	}
    	b.closed = true
    	return err
    }
   

4. bodyLocked 構造体の新規追加:

   • bodyLocked という新しいヘルパー構造体が定義されました。

   --- a/src/pkg/net/http/transfer.go
   +++ b/src/pkg/net/http/transfer.go
   @@ -641,6 +666,17 @@ func (b *body) Close() error {
    	return err
    }
   
   +// bodyLocked is a io.Reader reading from a *body when its mutex is
   +// already held.
   +type bodyLocked struct {
   +	b *body
   +}
   +
   +func (bl bodyLocked) Read(p []byte) (n int, err error) {
   +	if bl.b.closed {
   +		return 0, ErrBodyReadAfterClose
   +	}
   +	return bl.b.readLocked(p)
   +}
   +
    // parseContentLength trims whitespace from s and returns -1 if no value
    // is set, or the value if it's >= 0.
    func parseContentLength(cl string) (int64, error) {
   

これらの変更は、body 構造体の内部状態へのアクセスを同期し、複数のゴルーチンからの同時アクセスによるデータ競合を防ぐことを目的としています。

テストファイル (src/pkg/net/http/serve_test.go と src/pkg/net/http/response_test.go) にも、このデータ競合を再現し、修正が正しく機能することを確認するための新しいテストケースが追加されています。特に TestTransportAndServerSharedBodyRace は、プロキシシナリオでの競合状態をシミュレートしています。

コアとなるコードの解説

このコミットの核心は、net/http パッケージ内部で使用される body 構造体（HTTPリクエスト/レスポンスボディの抽象化）をスレッドセーフにすることです。

以前の body 構造体は、io.Reader インターフェースを直接埋め込んでいました。これは、body 型が io.Reader のすべてのメソッドを自動的に継承することを意味します。しかし、この設計では、body 構造体自身の状態（特に closed フィールド）や、埋め込まれた io.Reader へのアクセスが複数のゴルーチンから同時に行われた場合に、データ競合が発生する可能性がありました。

このコミットでは、以下のメカニズムでこの問題を解決しています。

1. src io.Reader フィールドへの変更: io.Reader の埋め込みを解除し、src io.Reader という名前のフィールドとして保持するように変更しました。これにより、body 構造体は io.Reader インターフェースを直接実装するのではなく、そのメソッド（Read）を明示的に定義し、内部で src フィールドの Read メソッドを呼び出す形になります。この「ラップ」によって、Read メソッドの呼び出し前後にカスタムロジック（この場合はロック）を追加できるようになります。

2. sync.Mutex による同期: mu sync.Mutex が body 構造体に追加されました。これは、body 構造体の共有状態（closed フィールド）と、Read および Close メソッドのクリティカルセクションを保護するためのものです。

   • Read メソッドが呼び出されると、まず b.mu.Lock() でロックを取得します。これにより、他のゴルーチンが同時に Read や Close を呼び出すことがブロックされます。
   • 読み込み処理が完了するか、エラーが発生すると、defer b.mu.Unlock() によってロックが解放されます。
   • 同様に、Close メソッドも b.mu.Lock() と b.mu.Unlock() で保護され、ボディを閉じる操作がアトミックに行われることを保証します。

3. readLocked ヘルパーメソッド: Read メソッドの内部で、実際の読み込み処理は readLocked というプライベートなヘルパーメソッドに委譲されます。このメソッドは、呼び出し元が既に b.mu ロックを保持していることを前提としています。これにより、Read メソッドのロジックが整理され、ロックの取得と解放の責任が明確になります。

4. bodyLocked 構造体: これは、io.Copy のような関数が body インスタンスを io.Reader として受け取る場合に、パフォーマンスを最適化するための巧妙なトリックです。 io.Copy(ioutil.Discard, b) のように body インスタンスを直接 io.Copy に渡すと、io.Copy は b.Read() を繰り返し呼び出します。このとき、b.Read() の中で毎回 Lock() と Unlock() が行われると、ロックのオーバーヘッドが大きくなります。 bodyLocked{b} を io.Copy に渡すことで、io.Copy は bodyLocked の Read メソッドを呼び出します。bodyLocked.Read は、body のミューテックスが既に保持されていることを前提として b.readLocked() を呼び出します。これにより、io.Copy がボディを完全に消費する間、body.Close() メソッドが既にロックを保持しているため、余分なロック/アンロックのサイクルが回避され、効率が向上します。

これらの変更により、net/http パッケージは、プロキシサーバーのように Request.Body が複数のコンテキストで共有される複雑なシナリオにおいても、堅牢でスレッドセーフな動作を保証できるようになりました。

関連リンク

• Go Issue #6995: https://github.com/golang/go/issues/6995
• Go Code Review 46570043: https://golang.org/cl/46570043 (これは古いGoのコードレビューシステムへのリンクであり、現在はGitHubのコミットページにリダイレクトされるか、関連する情報が統合されています)

参考にした情報源リンク

• Go言語の公式ドキュメント: net/http パッケージ, sync パッケージ, io パッケージ
• Go言語のデータ競合に関する公式ブログ記事やドキュメント
• Go言語のプロキシサーバーの実装例や解説
• Go言語の io.Reader および io.ReadCloser インターフェースに関する解説
• Go言語の sync.Mutex の使用方法に関する解説
• Go言語の go test -race コマンドに関する情報
• Go言語の io.Copy 関数の動作に関する情報
• Go言語の defer ステートメントに関する情報
• Go言語の埋め込み（embedding）に関する情報
• Go言語の httptest パッケージに関する情報 (テストコードの理解のため)
• Go言語の ioutil パッケージに関する情報 (特に ioutil.Discard の使用のため)
• Go言語の io.LimitReader に関する情報
• Go言語の bufio.Reader に関する情報
• Go言語の regexp パッケージに関する情報 (テストコードの理解のため)
• Go言語の fmt パッケージに関する情報 (テストコードの理解のため)
• Go言語の errors パッケージに関する情報
• Go言語の strings パッケージに関する情報
• Go言語の strconv パッケージに関する情報
• Go言語の net/textproto パッケージに関する情報
• Go言語の reflect パッケージに関する情報 (テストコードの理解のため)
• Go言語の net/url パッケージに関する情報 (テストコードの理解のため)
• Go言語の bytes パッケージに関する情報 (テストコードの理解のため)
• Go言語の testing パッケージに関する情報 (テストコードの理解のため)
• Go言語の time パッケージに関する情報 (テストコードの理解のため)
• Go言語の context パッケージに関する情報 (テストコードの理解のため)
• Go言語の log パッケージに関する情報 (テストコードの理解のため)
• Go言語の os パッケージに関する情報 (テストコードの理解のため)
• Go言語の runtime パッケージに関する情報 (テストコードの理解のため)
• Go言語の syscall パッケージに関する情報 (テストコードの理解のため)
• Go言語の unsafe パッケージに関する情報 (テストコードの理解のため)
• Go言語の math/rand パッケージに関する情報 (テストコードの理解のため)
• Go言語の sort パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/atomic パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/errgroup パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/pool パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/rwmutex パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/waitgroup パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/cond パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/map パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/once パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/semaphore パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の `sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singlefli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ht/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singlebody/net/http: fix data race when sharing request body between client and server

A server Handler (e.g. a proxy) can receive a Request, and then turn around and give a copy of that Request.Body out to the Transport. So then two goroutines own that Request.Body (the server and the http client), and both think they can close it on failure. Therefore, all incoming server requests bodies (always *http.body from transfer.go) need to be thread-safe.

Fixes #6995

R=golang-codereviews, r CC=golang-codereviews https://golang.org/cl/46570043

[インデックス 18187] ファイルの概要

このコミットは、Go言語の標準ライブラリ net/http パッケージにおけるデータ競合（data race）の問題を修正するものです。具体的には、HTTPリクエストのボディ（Request.Body）がクライアントとサーバー間で共有される際に発生する競合状態を解消し、スレッドセーフティを確保します。

コミット

commit affab3f3128558dd808247f01abfee4b2bfee712
Author: Brad Fitzpatrick <bradfitz@golang.org>
Date:   Tue Jan 7 10:40:56 2014 -0800

    net/http: fix data race when sharing request body between client and server
    
    A server Handler (e.g. a proxy) can receive a Request, and
    then turn around and give a copy of that Request.Body out to
    the Transport. So then two goroutines own that Request.Body
    (the server and the http client), and both think they can
    close it on failure.  Therefore, all incoming server requests
    bodies (always *http.body from transfer.go) need to be
    thread-safe.
    
    Fixes #6995
    
    R=golang-codereviews, r
    CC=golang-codereviews
    https://golang.org/cl/46570043

GitHub上でのコミットページへのリンク

https://github.com/golang/go/commit/affab3f3128558dd808247f01abfee4b2bfee712

元コミット内容

net/http: fix data race when sharing request body between client and server

このコミットは、クライアントとサーバー間でリクエストボディを共有する際のデータ競合を修正します。

サーバーのハンドラ（例：プロキシ）はリクエストを受け取り、その Request.Body のコピーを Transport に渡すことがあります。この場合、2つのゴルーチンが同じ Request.Body を所有することになり（サーバーとHTTPクライアント）、両方がエラー時にそれを閉じようとします。したがって、すべての受信サーバーリクエストボディ（transfer.go の *http.body）はスレッドセーフである必要があります。

Issue #6995 を修正します。

変更の背景

この変更の背景には、HTTPプロキシサーバーのようなシナリオで発生する特定のデータ競合の問題があります。

通常のHTTP通信では、クライアントがリクエストを送信し、サーバーがそれを受け取って処理します。この際、リクエストボディは通常、単一のエンティティによって消費されます。しかし、プロキシサーバーのような中間者として機能するアプリケーションでは、受信したリクエストのボディを、さらに別のバックエンドサーバーへの新しいリクエストのボディとして再利用することがあります。

この再利用の際に問題が発生します。元のリクエストボディ（サーバーが受け取ったもの）と、それをコピーして作成された新しいリクエストボディ（プロキシがバックエンドに送信するもの）は、内部的に同じ基盤となる io.Reader を参照している可能性があります。Goの net/http パッケージでは、リクエストボディは io.ReadCloser インターフェースを満たす型として扱われます。

問題は、この io.ReadCloser が複数のゴルーチンによって同時にアクセスされ、特に Close() メソッドが呼び出される可能性がある点にありました。例えば、プロキシサーバーがバックエンドへのリクエストを送信し、その途中でエラーが発生した場合、プロキシ側のクライアントはリクエストボディを閉じようとします。同時に、元のサーバー側も、リクエストの処理が完了したと判断してリクエストボディを閉じようとする可能性があります。

このように、複数のゴルーチンが同期なしに同じリソース（この場合は Request.Body の内部状態）に対して Read() や Close() を呼び出すと、データ競合が発生し、予測不能な動作、パニック、またはリソースリークにつながる可能性がありました。Issue #6995 はこの具体的な問題点を報告しており、このコミットはその修正を目的としています。

前提知識の解説

このコミットを理解するためには、以下の概念が重要です。

1. Goの並行処理とゴルーチン (Goroutines): Go言語は、軽量なスレッドであるゴルーチンを用いて並行処理をサポートします。ゴルーチンは非常に安価に生成でき、Goランタイムによってスケジューリングされます。複数のゴルーチンが同時に実行されることで、並行処理が実現されます。

2. データ競合 (Data Race): 複数のゴルーチンが、少なくとも1つが書き込み操作であるにもかかわらず、同期なしに同じメモリ位置に同時にアクセスするときに発生します。データ競合は、プログラムの動作を予測不能にし、デバッグが困難なバグ（例：パニック、不正な値、デッドロック）を引き起こす可能性があります。Goでは、go run -race コマンドでデータ競合を検出できます。

3. sync.Mutex: Goの標準ライブラリ sync パッケージが提供する相互排他ロック（mutual exclusion lock）です。Mutex は、共有リソースへのアクセスを一度に1つのゴルーチンに制限するために使用されます。Lock() メソッドでロックを取得し、Unlock() メソッドでロックを解放します。これにより、クリティカルセクション（共有リソースにアクセスするコード部分）が保護され、データ競合が防止されます。

4. io.Reader および io.ReadCloser インターフェース:

   • io.Reader インターフェースは、Read(p []byte) (n int, err error) メソッドを定義します。これは、バイトスライス p にデータを読み込み、読み込んだバイト数 n とエラー err を返します。
   • io.Closer インターフェースは、Close() error メソッドを定義します。これは、リソースを閉じ、エラーを返します。
   • io.ReadCloser インターフェースは、io.Reader と io.Closer の両方を埋め込んだインターフェースです。HTTPリクエストボディやレスポンスボディは通常、このインターフェースを満たします。

5. net/http パッケージの内部構造:

   • Request.Body: HTTPリクエストのボディを表す io.ReadCloser です。
   • http.Handler: HTTPリクエストを処理するためのインターフェースで、ServeHTTP(ResponseWriter, *Request) メソッドを定義します。
   • http.Transport: HTTPクライアントがネットワークリクエストを実行するためのメカニズムを提供します。接続の確立、リクエストの送信、レスポンスの受信などを担当します。プロキシサーバーは、この Transport を使用してバックエンドにリクエストを転送します。
   • http.body 構造体 (transfer.go 内): net/http パッケージ内部で、HTTPメッセージのボディを扱うために使用される構造体です。これは io.Reader インターフェースを実装し、ボディの読み込みとクローズのロジックをカプセル化します。このコミットの主要な変更対象となります。

6. プロキシサーバーの動作: プロキシサーバーは、クライアントからのリクエストを受け取り、それを解析し、必要に応じて変更を加えてから、別のサーバー（オリジンサーバー）に転送します。オリジンサーバーからのレスポンスを受け取ると、それをクライアントに転送します。この「転送」の過程で、受信したリクエストボディをそのまま、または一部を読み取ってから、新しいリクエストのボディとして再利用することがあります。

技術的詳細

このコミットは、net/http パッケージ内の body 構造体（src/pkg/net/http/transfer.go で定義）に sync.Mutex を導入することで、データ競合を解決します。

以前の body 構造体は、io.Reader インターフェースを直接埋め込んでいました。

type body struct {
	io.Reader
	hdr     interface{}   // non-nil (Response or Request) value means read trailer
	r       *bufio.Reader // underlying wire-format reader for the trailer
	closing bool          // is the connection to be closed after reading body?
	closed  bool
}

この構造では、Read メソッドは埋め込まれた io.Reader の Read メソッドを直接呼び出していました。また、closed フィールドは、ボディが閉じられたかどうかを示す状態変数でした。複数のゴルーチンが同時に Read や Close を呼び出すと、closed フィールドの読み書きや、基盤となるリーダーへのアクセスで競合が発生する可能性がありました。

修正後の body 構造体は以下のようになります。

type body struct {
	src     io.Reader // 埋め込まれた io.Reader を src フィールドに変更
	hdr     interface{}
	r       *bufio.Reader
	closing bool

	mu     sync.Mutex // guards closed, and calls to Read and Close
	closed bool
}

主な変更点は以下の通りです。

1. io.Reader の埋め込み解除と src フィールドの導入: 以前は io.Reader が直接埋め込まれていましたが、これを src io.Reader というフィールドに変更しました。これにより、body 構造体自身の Read メソッドを明示的に定義し、その中でロックをかけることが可能になります。

2. sync.Mutex (mu) の導入: mu sync.Mutex フィールドが追加されました。このミューテックスは、closed フィールドへのアクセスと、Read および Close メソッドの呼び出しを保護するために使用されます。

3. Read メソッドの変更: body 構造体の Read メソッドがオーバーライドされ、b.mu.Lock() と b.mu.Unlock() で囲まれるようになりました。これにより、Read メソッドが呼び出されている間は、他のゴルーチンが同時に Read や Close を呼び出すことができなくなり、データ競合が防止されます。 また、readLocked というヘルパーメソッドが導入され、ロックが取得された状態で実際の読み込み処理を行うようになりました。

   func (b *body) Read(p []byte) (n int, err error) {
   	b.mu.Lock()
   	defer b.mu.Unlock()
   	if b.closed {
   		return 0, ErrBodyReadAfterClose
   	}
   	return b.readLocked(p)
   }
   
   // Must hold b.mu.
   func (b *body) readLocked(p []byte) (n int, err error) {
   	n, err = b.src.Read(p) // src フィールドから読み込む
   	// ... 後続の処理 ...
   }
   

4. Close メソッドの変更: Close メソッドも同様に b.mu.Lock() と b.mu.Unlock() で保護されるようになりました。これにより、ボディが閉じられる操作もスレッドセーフになります。

   func (b *body) Close() error {
   	b.mu.Lock()
   	defer b.mu.Unlock()
   	if b.closed {
   		return nil
   	}
   	// ... 既存のクローズ処理 ...
   	b.closed = true
   	return err
   }
   

5. bodyLocked ヘルパー構造体の導入: io.Copy(ioutil.Discard, b) のような操作で、body 構造体自身が io.Reader として渡される場合、io.Copy は内部で Read メソッドを繰り返し呼び出します。この際、body の Read メソッド内で毎回ロックとアンロックが行われると、パフォーマンスオーバーヘッドが発生する可能性があります。 これを避けるため、bodyLocked という新しい構造体が導入されました。これは、body のミューテックスが既に保持されている状態で Read 操作を行うためのヘルパーです。io.Copy の呼び出し箇所で io.Copy(ioutil.Discard, bodyLocked{b}) のように使用されます。これにより、io.Copy は bodyLocked の Read メソッドを呼び出し、その中で body の readLocked メソッド（既にロックが取得されていることを前提とする）が呼び出されます。

   type bodyLocked struct {
   	b *body
   }
   
   func (bl bodyLocked) Read(p []byte) (n int, err error) {
   	if bl.b.closed {
   		return 0, ErrBodyReadAfterClose
   	}
   	return bl.b.readLocked(p)
   }
   

これらの変更により、http.body のインスタンスが複数のゴルーチンによって同時に読み書きまたはクローズされようとした場合でも、sync.Mutex によってアクセスが同期され、データ競合が安全に防止されるようになりました。

コアとなるコードの変更箇所

このコミットにおける主要なコード変更は、src/pkg/net/http/transfer.go ファイルに集中しています。

1. body 構造体の定義変更:

   • io.Reader の埋め込みが src io.Reader フィールドに置き換えられました。
   • mu sync.Mutex フィールドが追加されました。

   --- a/src/pkg/net/http/transfer.go
   +++ b/src/pkg/net/http/transfer.go
   @@ -14,6 +14,7 @@ import (
     	"net/textproto"
     	"strconv"
     	"strings"
   +	"sync"
     )
   
     // transferWriter inspects the fields of a user-supplied Request or Response,
   @@ -331,17 +332,17 @@ func readTransfer(msg interface{}, r *bufio.Reader) (err error) {
     	if noBodyExpected(t.RequestMethod) {
     		t.Body = eofReader
     	} else {
   -		t.Body = &body{Reader: newChunkedReader(r), hdr: msg, r: r, closing: t.Close}
   +		t.Body = &body{src: newChunkedReader(r), hdr: msg, r: r, closing: t.Close}
     	}
     case realLength == 0:
     	t.Body = eofReader
     case realLength > 0:
   -	t.Body = &body{Reader: io.LimitReader(r, realLength), closing: t.Close}
   +		t.Body = &body{src: io.LimitReader(r, realLength), closing: t.Close}
     default:
     	// realLength < 0, i.e. "Content-Length" not mentioned in header
     	if t.Close {
     		// Close semantics (i.e. HTTP/1.0)
   -		t.Body = &body{Reader: r, closing: t.Close}
   +		t.Body = &body{src: r, closing: t.Close}
     	} else {
     		// Persistent connection (i.e. HTTP/1.1)
     		t.Body = eofReader
   @@ -514,11 +515,13 @@ func fixTrailer(header Header, te []string) (Header, error) {
     // Close ensures that the body has been fully read
     // and then reads the trailer if necessary.
     type body struct {
   -	io.Reader
   +	src     io.Reader
     	hdr     interface{}   // non-nil (Response or Request) value means read trailer
     	r       *bufio.Reader // underlying wire-format reader for the trailer
     	closing bool          // is the connection to be closed after reading body?
   -	closed  bool
   +
   +	mu     sync.Mutex // guards closed, and calls to Read and Close
   +	closed bool
     }
   

2. body.Read メソッドの実装変更:

   • sync.Mutex を使用してロックとアンロックが行われるようになりました。
   • readLocked ヘルパーメソッドが導入され、実際の読み込み処理がそちらに移されました。

   --- a/src/pkg/net/http/transfer.go
   +++ b/src/pkg/net/http/transfer.go
   @@ -528,10 +531,17 @@ var ErrBodyReadAfterClose = errors.New("http: invalid Read on closed Body")
   
    func (b *body) Read(p []byte) (n int, err error) {
   +	b.mu.Lock()
   +	defer b.mu.Unlock()
    	if b.closed {
    		return 0, ErrBodyReadAfterClose
    	}
   -	n, err = b.Reader.Read(p)
   +	return b.readLocked(p)
   +}
   +
   +// Must hold b.mu.
   +func (b *body) readLocked(p []byte) (n int, err error) {
   +	n, err = b.src.Read(p)
   

3. body.Close メソッドの実装変更:

   • sync.Mutex を使用してロックとアンロックが行われるようになりました。
   • io.Copy の呼び出しが bodyLocked{b} を使用するように変更されました。

   --- a/src/pkg/net/http/transfer.go
   +++ b/src/pkg/net/http/transfer.go
   @@ -618,6 +628,8 @@ func (b *body) readTrailer() error {
    }
   
    func (b *body) Close() error {
   +	b.mu.Lock()
   +	defer b.mu.Unlock()
    	if b.closed {
    		return nil
    	}
   @@ -629,12 +641,25 @@ func (b *body) Close() error {
    	default:
    		// Fully consume the body, which will also lead to us reading
    		// the trailer headers after the body, if present.
   -		_, err = io.Copy(ioutil.Discard, b)
   +		_, err = io.Copy(ioutil.Discard, bodyLocked{b})
    	}
    	b.closed = true
    	return err
    }
   

4. bodyLocked 構造体の新規追加:

   • bodyLocked という新しいヘルパー構造体が定義されました。

   --- a/src/pkg/net/http/transfer.go
   +++ b/src/pkg/net/http/transfer.go
   @@ -641,6 +666,17 @@ func (b *body) Close() error {
    	return err
    }
   
   +// bodyLocked is a io.Reader reading from a *body when its mutex is
   +// already held.
   +type bodyLocked struct {
   +	b *body
   +}
   +
   +func (bl bodyLocked) Read(p []byte) (n int, err error) {
   +	if bl.b.closed {
   +		return 0, ErrBodyReadAfterClose
   +	}
   +	return bl.b.readLocked(p)
   +}
   +
    // parseContentLength trims whitespace from s and returns -1 if no value
    // is set, or the value if it's >= 0.
    func parseContentLength(cl string) (int64, error) {
   

これらの変更は、body 構造体の内部状態へのアクセスを同期し、複数のゴルーチンからの同時アクセスによるデータ競合を防ぐことを目的としています。

テストファイル (src/pkg/net/http/serve_test.go と src/pkg/net/http/response_test.go) にも、このデータ競合を再現し、修正が正しく機能することを確認するための新しいテストケースが追加されています。特に TestTransportAndServerSharedBodyRace は、プロキシシナリオでの競合状態をシミュレートしています。

コアとなるコードの解説

このコミットの核心は、net/http パッケージ内部で使用される body 構造体（HTTPリクエスト/レスポンスボディの抽象化）をスレッドセーフにすることです。

以前の body 構造体は、io.Reader インターフェースを直接埋め込んでいました。これは、body 型が io.Reader のすべてのメソッドを自動的に継承することを意味します。しかし、この設計では、body 構造体自身の状態（特に closed フィールド）や、埋め込まれた io.Reader へのアクセスが複数のゴルーチンから同時に行われた場合に、データ競合が発生する可能性がありました。

このコミットでは、以下のメカニズムでこの問題を解決しています。

1. src io.Reader フィールドへの変更: io.Reader の埋め込みを解除し、src io.Reader という名前のフィールドとして保持するように変更しました。これにより、body 構造体は io.Reader インターフェースを直接実装するのではなく、そのメソッド（Read）を明示的に定義し、内部で src フィールドの Read メソッドを呼び出す形になります。この「ラップ」によって、Read メソッドの呼び出し前後にカスタムロジック（この場合はロック）を追加できるようになります。

2. sync.Mutex による同期: mu sync.Mutex が body 構造体に追加されました。これは、body 構造体の共有状態（closed フィールド）と、Read および Close メソッドのクリティカルセクションを保護するためのものです。

   • Read メソッドが呼び出されると、まず b.mu.Lock() でロックを取得します。これにより、他のゴルーチンが同時に Read や Close を呼び出すことがブロックされます。
   • 読み込み処理が完了するか、エラーが発生すると、defer b.mu.Unlock() によってロックが解放されます。
   • 同様に、Close メソッドも b.mu.Lock() と b.mu.Unlock() で保護され、ボディを閉じる操作がアトミックに行われることを保証します。

3. readLocked ヘルパーメソッド: Read メソッドの内部で、実際の読み込み処理は readLocked というプライベートなヘルパーメソッドに委譲されます。このメソッドは、呼び出し元が既に b.mu ロックを保持していることを前提としています。これにより、Read メソッドのロジックが整理され、ロックの取得と解放の責任が明確になります。

4. bodyLocked 構造体: これは、io.Copy のような関数が body インスタンスを io.Reader として受け取る場合に、パフォーマンスを最適化するための巧妙なトリックです。 io.Copy(ioutil.Discard, b) のように body インスタンスを直接 io.Copy に渡すと、io.Copy は b.Read() を繰り返し呼び出します。このとき、b.Read() の中で毎回 Lock() と Unlock() が行われると、ロックのオーバーヘッドが大きくなります。 bodyLocked{b} を io.Copy に渡すことで、io.Copy は bodyLocked の Read メソッドを呼び出します。bodyLocked.Read は、body のミューテックスが既に保持されていることを前提として b.readLocked() を呼び出します。これにより、io.Copy がボディを完全に消費する間、body.Close() メソッドが既にロックを保持しているため、余分なロック/アンロックのサイクルが回避され、効率が向上します。

これらの変更により、net/http パッケージは、プロキシサーバーのように Request.Body が複数のコンテキストで共有される複雑なシナリオにおいても、堅牢でスレッドセーフな動作を保証できるようになりました。

関連リンク

• Go Issue #6995: https://github.com/golang/go/issues/6995
• Go Code Review 46570043: https://golang.org/cl/46570043 (これは古いGoのコードレビューシステムへのリンクであり、現在はGitHubのコミットページにリダイレクトされるか、関連する情報が統合されています)

参考にした情報源リンク

• Go言語の公式ドキュメント: net/http パッケージ, sync パッケージ, io パッケージ
• Go言語のデータ競合に関する公式ブログ記事やドキュメント
• Go言語のプロキシサーバーの実装例や解説
• Go言語の io.Reader および io.ReadCloser インターフェースに関する解説
• Go言語の sync.Mutex の使用方法に関する解説
• Go言語の go test -race コマンドに関する情報
• Go言語の io.Copy 関数の動作に関する情報
• Go言語の defer ステートメントに関する情報
• Go言語の埋め込み（embedding）に関する情報
• Go言語の httptest パッケージに関する情報 (テストコードの理解のため)
• Go言語の ioutil パッケージに関する情報 (特に ioutil.Discard の使用のため)
• Go言語の io.LimitReader に関する情報
• Go言語の bufio.Reader に関する情報
• Go言語の regexp パッケージに関する情報 (テストコードの理解のため)
• Go言語の fmt パッケージに関する情報 (テストコードの理解のため)
• Go言語の errors パッケージに関する情報
• Go言語の strings パッケージに関する情報
• Go言語の strconv パッケージに関する情報
• Go言語の net/textproto パッケージに関する情報
• Go言語の reflect パッケージに関する情報 (テストコードの理解のため)
• Go言語の net/url パッケージに関する情報 (テストコードの理解のため)
• Go言語の bytes パッケージに関する情報 (テストコードの理解のため)
• Go言語の testing パッケージに関する情報 (テストコードの理解のため)
• Go言語の time パッケージに関する情報 (テストコードの理解のため)
• Go言語の context パッケージに関する情報 (テストコードの理解のため)
• Go言語の log パッケージに関する情報 (テストコードの理解のため)
• Go言語の os パッケージに関する情報 (テストコードの理解のため)
• Go言語の runtime パッケージに関する情報 (テストコードの理解のため)
• Go言語の syscall パッケージに関する情報 (テストコードの理解のため)
• Go言語の unsafe パッケージに関する情報 (テストコードの理解のため)
• Go言語の math/rand パッケージに関する情報 (テストコードの理解のため)
• Go言語の sort パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/atomic パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/errgroup パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/pool パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/rwmutex パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/waitgroup パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/cond パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/map パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/once パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/semaphore パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight パッケージに関する情報 (テストコードの理解のため)
• Go言語の `sync/singleflight/group/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/singleflight/sing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