56 lines
1.2 KiB
Go
56 lines
1.2 KiB
Go
// Copyright 2017 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 hung when run under the C/C++ ThreadSanitizer. TSAN defers
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// asynchronous signals until the signaled thread calls into libc. The runtime's
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// sysmon goroutine idles itself using direct usleep syscalls, so it could
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// run for an arbitrarily long time without triggering the libc interceptors.
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// See https://golang.org/issue/18717.
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import (
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"os"
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"os/signal"
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"syscall"
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)
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/*
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#cgo CFLAGS: -g -fsanitize=thread
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#cgo LDFLAGS: -g -fsanitize=thread
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static void raise_usr2(int signo) {
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raise(SIGUSR2);
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}
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static void register_handler(int signo) {
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_ONSTACK;
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sa.sa_handler = raise_usr2;
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if (sigaction(SIGUSR1, &sa, NULL) != 0) {
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perror("failed to register SIGUSR1 handler");
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exit(EXIT_FAILURE);
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}
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}
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*/
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import "C"
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func main() {
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ch := make(chan os.Signal)
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signal.Notify(ch, syscall.SIGUSR2)
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C.register_handler(C.int(syscall.SIGUSR1))
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syscall.Kill(syscall.Getpid(), syscall.SIGUSR1)
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<-ch
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}
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