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https://github.com/golang/go
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c8ef0df06c
When Go code is used with C code compiled with -fsanitize=thread, adds thread sanitizer calls so that correctly synchronized Go code does not cause spurious failure reports from the thread sanitizer. This may cause some false negatives, but for the thread sanitizer what is most important is avoiding false positives. Change-Id: If670e4a6f2874c7a2be2ff7db8728c6036340a52 Reviewed-on: https://go-review.googlesource.com/17421 Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
56 lines
941 B
Go
56 lines
941 B
Go
// 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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