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// Copyright 2016 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.
//go:build (linux && amd64) || (freebsd && amd64)
// +build linux,amd64 freebsd,amd64
package main
// Test that an external C thread that is calling malloc can be hit
// with SIGCHLD signals. This used to fail when built with the race
// detector, because in that case the signal handler would indirectly
// call the C malloc function.
/*
#include <errno.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sched.h>
#include <unistd.h>
#define ALLOCERS 100
#define SIGNALERS 10
static void* signalThread(void* p) {
pthread_t* pt = (pthread_t*)(p);
int i, j;
for (i = 0; i < 100; i++) {
for (j = 0; j < ALLOCERS; j++) {
if (pthread_kill(pt[j], SIGCHLD) < 0) {
return NULL;
}
}
usleep(1);
}
return NULL;
}
#define CALLS 100
static void* mallocThread(void* p) {
int i;
void *a[CALLS];
for (i = 0; i < ALLOCERS; i++) {
sched_yield();
}
for (i = 0; i < CALLS; i++) {
a[i] = malloc(i);
}
for (i = 0; i < CALLS; i++) {
free(a[i]);
}
return NULL;
}
void runRaceSignalThread() {
int i;
pthread_t m[ALLOCERS];
pthread_t s[SIGNALERS];
for (i = 0; i < ALLOCERS; i++) {
pthread_create(&m[i], NULL, mallocThread, NULL);
}
for (i = 0; i < SIGNALERS; i++) {
pthread_create(&s[i], NULL, signalThread, &m[0]);
}
for (i = 0; i < SIGNALERS; i++) {
pthread_join(s[i], NULL);
}
for (i = 0; i < ALLOCERS; i++) {
pthread_join(m[i], NULL);
}
}
*/
import "C"
import (
"fmt"
"os"
"time"
)
func init() {
register("CgoRaceSignal", CgoRaceSignal)
}
func CgoRaceSignal() {
// The failure symptom is that the program hangs because of a
// deadlock in malloc, so set an alarm.
go func() {
time.Sleep(5 * time.Second)
fmt.Println("Hung for 5 seconds")
os.Exit(1)
}()
C.runRaceSignalThread()
fmt.Println("OK")
}
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