tsan6.go

Documentation: cmd/cgo/internal/testsanitizers/testdata

     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 writes to Go allocated memory, with Go synchronization,
     8  // do not look like a race.
     9  
    10  /*
    11  #cgo CFLAGS: -fsanitize=thread
    12  #cgo LDFLAGS: -fsanitize=thread
    13  
    14  void f(char *p) {
    15  	*p = 1;
    16  }
    17  */
    18  import "C"
    19  
    20  import (
    21  	"runtime"
    22  	"sync"
    23  )
    24  
    25  func main() {
    26  	var wg sync.WaitGroup
    27  	var mu sync.Mutex
    28  	c := make(chan []C.char, 100)
    29  	for i := 0; i < 10; i++ {
    30  		wg.Add(2)
    31  		go func() {
    32  			defer wg.Done()
    33  			for i := 0; i < 100; i++ {
    34  				c <- make([]C.char, 4096)
    35  				runtime.Gosched()
    36  			}
    37  		}()
    38  		go func() {
    39  			defer wg.Done()
    40  			for i := 0; i < 100; i++ {
    41  				p := &(<-c)[0]
    42  				mu.Lock()
    43  				C.f(p)
    44  				mu.Unlock()
    45  			}
    46  		}()
    47  	}
    48  	wg.Wait()
    49  }
    50
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