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https://github.com/golang/go
synced 2024-11-18 08:14:41 -07:00
66736880ca
Add TSAN acquire/release calls to runtime/cgo to match the ones generated by cgo. This avoids a false positive race around the malloc memory used in runtime/cgo when other goroutines are simultaneously calling malloc and free from cgo. These new calls will only be used when building with CGO_CFLAGS and CGO_LDFLAGS set to -fsanitize=thread, which becomes a requirement to avoid all false positives when using TSAN. These are needed not just for runtime/cgo, but also for any runtime package that uses cgo (such as net and os/user). Add an unused attribute to the _cgo_tsan_acquire and _cgo_tsan_release functions, in case there are no actual cgo function calls. Add a test that checks that setting CGO_CFLAGS/CGO_LDFLAGS avoids a false positive report when using os/user. Change-Id: I0905c644ff7f003b6718aac782393fa219514c48 Reviewed-on: https://go-review.googlesource.com/23492 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
52 lines
927 B
Go
52 lines
927 B
Go
// Copyright 2016 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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// Check that calls to C.malloc/C.free do not collide with the calls
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// made by the os/user package.
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// #cgo CFLAGS: -fsanitize=thread
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// #cgo LDFLAGS: -fsanitize=thread
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// #include <stdlib.h>
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import "C"
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import (
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"fmt"
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"os"
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"os/user"
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"runtime"
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"sync"
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)
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func main() {
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u, err := user.Current()
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if err != nil {
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fmt.Fprintln(os.Stderr, err)
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// Let the test pass.
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os.Exit(0)
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}
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var wg sync.WaitGroup
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for i := 0; i < 20; i++ {
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wg.Add(2)
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go func() {
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defer wg.Done()
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for i := 0; i < 1000; i++ {
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user.Lookup(u.Username)
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runtime.Gosched()
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}
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}()
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go func() {
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defer wg.Done()
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for i := 0; i < 1000; i++ {
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p := C.malloc(C.size_t(len(u.Username) + 1))
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runtime.Gosched()
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C.free(p)
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}
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}()
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}
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wg.Wait()
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}
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