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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
// This program hung when run under the C/C++ ThreadSanitizer. TSAN defers
// asynchronous signals until the signaled thread calls into libc. The runtime's
// sysmon goroutine idles itself using direct usleep syscalls, so it could
// run for an arbitrarily long time without triggering the libc interceptors.
// See https://golang.org/issue/18717.
import (
"os"
"os/signal"
"syscall"
)
/*
#cgo CFLAGS: -g -fsanitize=thread
#cgo LDFLAGS: -g -fsanitize=thread
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void raise_usr2(int signo) {
raise(SIGUSR2);
}
static void register_handler(int signo) {
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_ONSTACK;
sa.sa_handler = raise_usr2;
if (sigaction(SIGUSR1, &sa, NULL) != 0) {
perror("failed to register SIGUSR1 handler");
exit(EXIT_FAILURE);
}
}
*/
import "C"
func main() {
ch := make(chan os.Signal, 1)
signal.Notify(ch, syscall.SIGUSR2)
C.register_handler(C.int(syscall.SIGUSR1))
syscall.Kill(syscall.Getpid(), syscall.SIGUSR1)
<-ch
}