misc/cgo/testsanitizers/testdata/tsan5.go

   1 // Copyright 2016 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 main
   6
   7 // Check that calls to C.malloc/C.free do not collide with the calls
   8 // made by the os/user package.
   9
  10 // #cgo CFLAGS: -fsanitize=thread
  11 // #cgo LDFLAGS: -fsanitize=thread
  12 // #include <stdlib.h>
  13 import "C"
  14
  15 import (
  16         "fmt"
  17         "os"
  18         "os/user"
  19         "runtime"
  20         "sync"
  21 )
  22
  23 func main() {
  24         u, err := user.Current()
  25         if err != nil {
  26                 fmt.Fprintln(os.Stderr, err)
  27                 // Let the test pass.
  28                 os.Exit(0)
  29         }
  30
  31         var wg sync.WaitGroup
  32         for i := 0; i < 20; i++ {
  33                 wg.Add(2)
  34                 go func() {
  35                         defer wg.Done()
  36                         for i := 0; i < 1000; i++ {
  37                                 user.Lookup(u.Username)
  38                                 runtime.Gosched()
  39                         }
  40                 }()
  41                 go func() {
  42                         defer wg.Done()
  43                         for i := 0; i < 1000; i++ {
  44                                 p := C.malloc(C.size_t(len(u.Username) + 1))
  45                                 runtime.Gosched()
  46                                 C.free(p)
  47                         }
  48                 }()
  49         }
  50         wg.Wait()
  51 }