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tsan2.go
// Copyright 2015 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 // This program produced false race reports when run under the C/C++ // ThreadSanitizer, as it did not understand the synchronization in // the Go code. /* #cgo CFLAGS: -fsanitize=thread #cgo LDFLAGS: -fsanitize=thread extern void GoRun(void); // Yes, you can have definitions if you use //export, as long as they are weak. int val __attribute__ ((weak)); int run(void) __attribute__ ((weak)); int run() { val = 1; GoRun(); return val; } void setVal(int) __attribute__ ((weak)); void setVal(int i) { val = i; } */ import "C" import "runtime" //export GoRun func GoRun() { runtime.LockOSThread() c := make(chan bool) go func() { runtime.LockOSThread() C.setVal(2) c <- true }() <-c } func main() { if v := C.run(); v != 2 { panic(v) } }
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