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// Copyright 2016 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 main
// Check that writes to Go allocated memory, with Go synchronization,
// do not look like a race.
/*
#cgo CFLAGS: -fsanitize=thread
#cgo LDFLAGS: -fsanitize=thread
void f(char *p) {
*p = 1;
}
*/
import "C"
import (
"runtime"
"sync"
)
func main() {
var wg sync.WaitGroup
var mu sync.Mutex
c := make(chan []C.char, 100)
for i := 0; i < 10; i++ {
wg.Add(2)
go func() {
defer wg.Done()
for i := 0; i < 100; i++ {
c <- make([]C.char, 4096)
runtime.Gosched()
}
}()
go func() {
defer wg.Done()
for i := 0; i < 100; i++ {
p := &(<-c)[0]
mu.Lock()
C.f(p)
mu.Unlock()
}
}()
}
wg.Wait()
}
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