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- // 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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