glibc/tests/Regression/bz495955-RHEL5-glibc-doesn-t-use-private-futex-system/priv-mutex.c
Sergey Kolosov ab4bc8a24e Extend the test coverage
Move some of the RHEL QE testcases upstream to Fedora.
2022-05-31 09:29:27 +02:00

182 lines
4.7 KiB
C

/******************************************************************************
*
* Copyright © International Business Machines Corp., 2009
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* NAME
* priv-mutex.c
*
* DESCRIPTION
* Test the shared and private settings of pthread mutexes.
*
* USAGE:
* priv-mutex [-p][-s]
*
* AUTHOR
* Darren Hart <dvhltc@us.ibm.com>
*
* HISTORY
* 2009-Apr-9: Initial version by Darren Hart <dvhltc@us.ibm.com>
*
*****************************************************************************/
#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include <pthread.h>
#include <time.h>
#include <errno.h>
#define MUTEX_PSHARED_FLAG 128
#define MUTEX_PI_FLAG 32
pthread_mutex_t mutex;
pthread_barrier_t lock_barrier;
pthread_barrier_t unlock_barrier;
void usage(char *arg0)
{
printf("usage: %s [-p][-s]\n");
printf("-p: use private mutexes\n");
printf("-s: use shared mutexes\n");
printf("no args: use system default\n");
}
void *lock_thread(void *arg)
{
int ret;
if (pthread_mutex_lock(&mutex))
{
perror("lock_thread failed to acquire the lock");
return NULL;
}
/* Let the main thread know we took the lock. */
ret = pthread_barrier_wait(&lock_barrier);
if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD) {
perror("pthread_barrier_wait failed");
return NULL;
}
/* Wait for the main thread to timeout trying to get the lock. */
ret = pthread_barrier_wait(&unlock_barrier);
if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD) {
perror("pthread_barrier_wait failed");
return NULL;
}
if (pthread_mutex_unlock(&mutex))
{
perror("main failed to release the lock");
return NULL;
}
pthread_exit(0);
}
int main(int argc, char *argv[])
{
int opt, pshared, child_ret, set_pshared = 0, ret = 0;
pthread_mutexattr_t attr;
struct timespec timeout;
pthread_t child;
while ((opt = getopt(argc, argv, "ps")) != -1) {
switch (opt) {
case 'p':
pshared = PTHREAD_PROCESS_PRIVATE;
set_pshared = 1;
break;
case 's':
pshared = PTHREAD_PROCESS_SHARED;
set_pshared = 1;
break;
default:
usage(argv[0]);
return -1;
}
}
/* Setup the mutex. */
if (pthread_mutexattr_init(&attr)) {
perror("pthread_mutexattr_init failed");
return -1;
}
if (pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_INHERIT)) {
perror("pthread_mutexattr_setprotocol failed");
return -1;
}
if (set_pshared) {
if (pthread_mutexattr_setpshared(&attr, pshared)) {
perror("pthread_mutexattr_setpshared failed");
return -1;
}
}
if (pthread_mutex_init(&mutex, &attr)) {
perror("pthread_mutex_init failed");
return -1;
}
printf("Using %s mutexes\n", mutex.__data.__kind & MUTEX_PSHARED_FLAG ?
"PTHREAD_PROCESS_SHARED" : "PTHREAD_PROCESS_PRIVATE");
/* Setup the barriers. */
if (pthread_barrier_init(&lock_barrier, NULL, 2)) {
perror("failed to create lock_barrier");
return -1;
}
if (pthread_barrier_init(&unlock_barrier, NULL, 2)) {
perror("failed to create lock_barrier");
return -1;
}
/*
* Spawn a thread to grab the lock and then try to grab it here,
* forcing glibc to make the appropriate futex system-call.
*/
if (pthread_create(&child, NULL, lock_thread, NULL)) {
perror("failed to create child thread");
return -1;
}
ret = pthread_barrier_wait(&lock_barrier);
if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD) {
perror("pthread_barrier_wait failed");
return -1;
}
timeout.tv_sec = 0;
timeout.tv_nsec = 100000;
ret = pthread_mutex_timedlock(&mutex, &timeout);
if (ret && ret != ETIMEDOUT) {
perror("main failed to acquire the lock");
return -1;
}
ret = pthread_barrier_wait(&unlock_barrier);
if (ret && ret != PTHREAD_BARRIER_SERIAL_THREAD) {
perror("pthread_barrier_wait failed");
return -1;
}
pthread_join(child, NULL);
/* Cleanup */
if (pthread_mutex_destroy(&mutex)) {
perror("pthread_mutex_destroy failed");
ret = -1;
}
if (pthread_mutexattr_destroy(&attr)) {
perror("pthread_mutexattr_destroy failed");
ret = -1;
}
return ret;
}