mirror of
https://github.com/golang/go
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56 lines
941 B
Go
56 lines
941 B
Go
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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// This program produced false race reports when run under the C/C++
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// ThreadSanitizer, as it did not understand the synchronization in
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// the Go code.
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/*
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#cgo CFLAGS: -fsanitize=thread
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#cgo LDFLAGS: -fsanitize=thread
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extern void GoRun(void);
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// Yes, you can have definitions if you use //export, as long as they are weak.
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int val __attribute__ ((weak));
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int run(void) __attribute__ ((weak));
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int run() {
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val = 1;
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GoRun();
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return val;
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}
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void setVal(int) __attribute__ ((weak));
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void setVal(int i) {
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val = i;
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}
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*/
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import "C"
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import "runtime"
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//export GoRun
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func GoRun() {
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runtime.LockOSThread()
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c := make(chan bool)
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go func() {
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runtime.LockOSThread()
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C.setVal(2)
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c <- true
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}()
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<-c
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}
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func main() {
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if v := C.run(); v != 2 {
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panic(v)
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}
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}
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