1 // Copyright 2015 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 // This program produced false race reports when run under the C/C++ 8 // ThreadSanitizer, as it did not understand the synchronization in 9 // the Go code. 10 11 /* 12 #cgo CFLAGS: -fsanitize=thread 13 #cgo LDFLAGS: -fsanitize=thread 14 15 extern void GoRun(void); 16 17 // Yes, you can have definitions if you use //export, as long as they are weak. 18 19 int val __attribute__ ((weak)); 20 21 int run(void) __attribute__ ((weak)); 22 23 int run() { 24 val = 1; 25 GoRun(); 26 return val; 27 } 28 29 void setVal(int) __attribute__ ((weak)); 30 31 void setVal(int i) { 32 val = i; 33 } 34 */ 35 import "C" 36 37 import "runtime" 38 39 //export GoRun 40 func GoRun() { 41 runtime.LockOSThread() 42 c := make(chan bool) 43 go func() { 44 runtime.LockOSThread() 45 C.setVal(2) 46 c <- true 47 }() 48 <-c 49 } 50 51 func main() { 52 if v := C.run(); v != 2 { 53 panic(v) 54 } 55 } 56
