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/* Verify that condition variables synchronized by PI mutexes don't hang.
Copyright (C) 2012-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#define THREADS_NUM 5
#define MAXITER 50000
static pthread_mutex_t mutex;
static pthread_mutexattr_t mutex_attr;
static pthread_cond_t cond;
static pthread_t threads[THREADS_NUM];
static int pending = 0;
typedef void * (*threadfunc) (void *);
void *
thread_fun_timed (void *arg)
{
int *ret = arg;
int rv, i;
printf ("Started thread_fun_timed[%d]\n", *ret);
for (i = 0; i < MAXITER / THREADS_NUM; i++)
{
rv = pthread_mutex_lock (&mutex);
if (rv)
{
printf ("pthread_mutex_lock: %s(%d)\n", strerror (rv), rv);
*ret = 1;
goto out;
}
while (!pending)
{
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += 20;
rv = pthread_cond_timedwait (&cond, &mutex, &ts);
/* There should be no timeout either. */
if (rv)
{
printf ("pthread_cond_wait: %s(%d)\n", strerror (rv), rv);
*ret = 1;
goto out;
}
}
pending--;
rv = pthread_mutex_unlock (&mutex);
if (rv)
{
printf ("pthread_mutex_unlock: %s(%d)\n", strerror (rv), rv);
*ret = 1;
goto out;
}
}
*ret = 0;
out:
return ret;
}
void *
thread_fun (void *arg)
{
int *ret = arg;
int rv, i;
printf ("Started thread_fun[%d]\n", *ret);
for (i = 0; i < MAXITER / THREADS_NUM; i++)
{
rv = pthread_mutex_lock (&mutex);
if (rv)
{
printf ("pthread_mutex_lock: %s(%d)\n", strerror (rv), rv);
*ret = 1;
goto out;
}
while (!pending)
{
rv = pthread_cond_wait (&cond, &mutex);
if (rv)
{
printf ("pthread_cond_wait: %s(%d)\n", strerror (rv), rv);
*ret = 1;
goto out;
}
}
pending--;
rv = pthread_mutex_unlock (&mutex);
if (rv)
{
printf ("pthread_mutex_unlock: %s(%d)\n", strerror (rv), rv);
*ret = 1;
goto out;
}
}
*ret = 0;
out:
return ret;
}
static int
do_test_wait (threadfunc f)
{
int i;
int rv;
int counter = 0;
int retval[THREADS_NUM];
puts ("Starting test");
rv = pthread_mutexattr_init (&mutex_attr);
if (rv)
{
printf ("pthread_mutexattr_init: %s(%d)\n", strerror (rv), rv);
return 1;
}
rv = pthread_mutexattr_setprotocol (&mutex_attr, PTHREAD_PRIO_INHERIT);
if (rv)
{
printf ("pthread_mutexattr_setprotocol: %s(%d)\n", strerror (rv), rv);
return 1;
}
rv = pthread_mutex_init (&mutex, &mutex_attr);
if (rv)
{
printf ("pthread_mutex_init: %s(%d)\n", strerror (rv), rv);
return 1;
}
rv = pthread_cond_init (&cond, NULL);
if (rv)
{
printf ("pthread_cond_init: %s(%d)\n", strerror (rv), rv);
return 1;
}
for (i = 0; i < THREADS_NUM; i++)
{
retval[i] = i;
rv = pthread_create (&threads[i], NULL, f, &retval[i]);
if (rv)
{
printf ("pthread_create: %s(%d)\n", strerror (rv), rv);
return 1;
}
}
for (; counter < MAXITER; counter++)
{
rv = pthread_mutex_lock (&mutex);
if (rv)
{
printf ("pthread_mutex_lock: %s(%d)\n", strerror (rv), rv);
return 1;
}
if (!(counter % 100))
printf ("counter: %d\n", counter);
pending += 1;
rv = pthread_cond_signal (&cond);
if (rv)
{
printf ("pthread_cond_signal: %s(%d)\n", strerror (rv), rv);
return 1;
}
rv = pthread_mutex_unlock (&mutex);
if (rv)
{
printf ("pthread_mutex_unlock: %s(%d)\n", strerror (rv), rv);
return 1;
}
}
for (i = 0; i < THREADS_NUM; i++)
{
void *ret;
rv = pthread_join (threads[i], &ret);
if (rv)
{
printf ("pthread_join: %s(%d)\n", strerror (rv), rv);
return 1;
}
if (ret && *(int *)ret)
{
printf ("Thread %d returned with an error\n", i);
return 1;
}
}
return 0;
}
static int
do_test (void)
{
puts ("Testing pthread_cond_wait");
int ret = do_test_wait (thread_fun);
if (ret)
return ret;
puts ("Testing pthread_cond_timedwait");
return do_test_wait (thread_fun_timed);
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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