go io_test 源码
golang io_test 代码
文件路径：/src/runtime/race/testdata/io_test.go
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package race_test
import (
"fmt"
"net"
"net/http"
"os"
"path/filepath"
"sync"
"testing"
"time"
)
func TestNoRaceIOFile(t *testing.T) {
x := 0
path := t.TempDir()
fname := filepath.Join(path, "data")
go func() {
x = 42
f, _ := os.Create(fname)
f.Write([]byte("done"))
f.Close()
}()
for {
f, err := os.Open(fname)
if err != nil {
time.Sleep(1e6)
continue
}
buf := make([]byte, 100)
count, err := f.Read(buf)
if count == 0 {
time.Sleep(1e6)
continue
}
break
}
_ = x
}
var (
regHandler sync.Once
handlerData int
)
func TestNoRaceIOHttp(t *testing.T) {
regHandler.Do(func() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
handlerData++
fmt.Fprintf(w, "test")
handlerData++
})
})
ln, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
t.Fatalf("net.Listen: %v", err)
}
defer ln.Close()
go http.Serve(ln, nil)
handlerData++
_, err = http.Get("http://" + ln.Addr().String())
if err != nil {
t.Fatalf("http.Get: %v", err)
}
handlerData++
_, err = http.Get("http://" + ln.Addr().String())
if err != nil {
t.Fatalf("http.Get: %v", err)
}
handlerData++
}
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