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/*
* source URL:
* http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=67838
*/
/*
* Author: Petter Reinholdtsen <pere@hungry.com>
* Date: 2002-02-13
* Lisence: GPL
*
* Small test program to demonstrate efence crashing on multithreaded
* programs.
* Link it like this, and it crashes with segfault.
* cc -o efence-thread-test efence-thread-test.c -lpthread -lefence
* Remove the -lefence, and it work as it should.
* The output from gdb when it fails:
*
* Program received signal SIGSEGV, Segmentation fault.
* [Switching to Thread 1026 (LWP 1189)]
* 0x400382c7 in memalign () from /usr/lib/libefence.so.0
* (gdb) bt
* #0 0x400382c7 in memalign () from /usr/lib/libefence.so.0
* #1 0x4003873c in malloc () from /usr/lib/libefence.so.0
* #2 0x400a0811 in fopen () from /lib/libc.so.6
* #3 0x080488e8 in thread_func ()
* #4 0x40027f0a in pthread_start_thread () from /lib/libpthread.so.0
* #5 0x40027f51 in pthread_start_thread_event () from /lib/libpthread.so.0
*/
/* check for pthread library */
#if (!defined(WIN32) || defined(__CYGWIN__))
#define HAVE_PTHREADS 1
#else
#define HAVE_PTHREADS 0
#endif
#include <stdlib.h>
#include <stdio.h>
#if HAVE_PTHREADS
#include <pthread.h>
#include "../duma.h"
static pthread_mutex_t mutex;
static volatile int threads_left = 2;
static void* thread_func(void *arg)
{
int i = 2000;
char *name = (char*)arg;
while (--i)
{
if (pthread_mutex_lock(&mutex))
{
fprintf(stderr, "error: %s failed to lock mutex.\n", name);
exit(1);
}
printf ("%s : %d\n", name, i);
if (pthread_mutex_unlock(&mutex))
{
fprintf(stderr, "error: %s failed to unlock mutex.\n", name);
exit(1);
}
{
/* Try to trigger efence error */
FILE *fp = fopen("/etc/resolv.conf", "r");
if (NULL != fp)
{
char buf[1024];
fread(buf, sizeof(buf), 1, fp);
fclose(fp);
}
}
}
--threads_left;
return NULL;
}
static void*
idle_func(void* arg)
{
(void)arg;
while (threads_left) ;
/* NOTREACHED */
return NULL;
}
int main(int argc, char **argv)
{
pthread_t hello_thread, goodbye_thread;
(void)argc;
(void)argv;
pthread_mutex_init(&mutex, NULL);
if (pthread_create(&hello_thread, NULL, thread_func, (void*)"hello"))
{
fprintf(stderr, "Failed to create hello thread\n");
exit(1);
}
if (pthread_create(&goodbye_thread, NULL, thread_func, (void*)"goodbye"))
{
fprintf(stderr, "Failed to create goodbye thread\n");
exit(1);
}
idle_func(NULL);
pthread_mutex_destroy(&mutex);
/* NOTREACHED */
return 0;
}
#else
int main(int argc, char **argv)
{
(void)argc;
(void)argv;
printf("Test not implemented for Win32 and Mingw\n");
return 0;
}
#endif
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