github.com/twelsh-aw/go/src@v0.0.0-20230516233729-a56fe86a7c81/runtime/race/testdata/io_test.go (about)

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package race_test
     6  
     7  import (
     8  	"fmt"
     9  	"net"
    10  	"net/http"
    11  	"os"
    12  	"path/filepath"
    13  	"sync"
    14  	"testing"
    15  	"time"
    16  )
    17  
    18  func TestNoRaceIOFile(t *testing.T) {
    19  	x := 0
    20  	path := t.TempDir()
    21  	fname := filepath.Join(path, "data")
    22  	go func() {
    23  		x = 42
    24  		f, _ := os.Create(fname)
    25  		f.Write([]byte("done"))
    26  		f.Close()
    27  	}()
    28  	for {
    29  		f, err := os.Open(fname)
    30  		if err != nil {
    31  			time.Sleep(1e6)
    32  			continue
    33  		}
    34  		buf := make([]byte, 100)
    35  		count, err := f.Read(buf)
    36  		if count == 0 {
    37  			time.Sleep(1e6)
    38  			continue
    39  		}
    40  		break
    41  	}
    42  	_ = x
    43  }
    44  
    45  var (
    46  	regHandler  sync.Once
    47  	handlerData int
    48  )
    49  
    50  func TestNoRaceIOHttp(t *testing.T) {
    51  	regHandler.Do(func() {
    52  		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    53  			handlerData++
    54  			fmt.Fprintf(w, "test")
    55  			handlerData++
    56  		})
    57  	})
    58  	ln, err := net.Listen("tcp", "127.0.0.1:0")
    59  	if err != nil {
    60  		t.Fatalf("net.Listen: %v", err)
    61  	}
    62  	defer ln.Close()
    63  	go http.Serve(ln, nil)
    64  	handlerData++
    65  	_, err = http.Get("http://" + ln.Addr().String())
    66  	if err != nil {
    67  		t.Fatalf("http.Get: %v", err)
    68  	}
    69  	handlerData++
    70  	_, err = http.Get("http://" + ln.Addr().String())
    71  	if err != nil {
    72  		t.Fatalf("http.Get: %v", err)
    73  	}
    74  	handlerData++
    75  }