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