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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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