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/* Test of condition variables in multithreaded situations.
Copyright (C) 2008-2023 Free Software Foundation, Inc.
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 3 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, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#if USE_ISOC_THREADS || USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS || USE_WINDOWS_THREADS
/* Which tests to perform.
Uncomment some of these, to verify that all tests crash if no locking
is enabled. */
#define DO_TEST_COND 1
#define DO_TEST_TIMEDCOND 1
/* Whether to help the scheduler through explicit sched_yield().
Uncomment this to see if the operating system has a fair scheduler. */
#define EXPLICIT_YIELD 1
/* Whether to print debugging messages. */
#define ENABLE_DEBUGGING 0
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#if EXPLICIT_YIELD
# include <sched.h>
#endif
#if HAVE_DECL_ALARM
# include <signal.h>
# include <unistd.h>
#endif
#include "macros.h"
#if ENABLE_DEBUGGING
# define dbgprintf printf
#else
# define dbgprintf if (0) printf
#endif
#if EXPLICIT_YIELD
# define yield() sched_yield ()
#else
# define yield()
#endif
/*
* Condition check
*/
static int cond_value = 0;
static pthread_cond_t condtest;
static pthread_mutex_t lockcond;
static void *
pthread_cond_wait_routine (void *arg)
{
ASSERT (pthread_mutex_lock (&lockcond) == 0);
while (!cond_value)
{
ASSERT (pthread_cond_wait (&condtest, &lockcond) == 0);
}
ASSERT (pthread_mutex_unlock (&lockcond) == 0);
cond_value = 2;
return NULL;
}
static void
test_pthread_cond_wait ()
{
struct timespec remain;
pthread_t thread;
int ret;
remain.tv_sec = 2;
remain.tv_nsec = 0;
cond_value = 0;
ASSERT (pthread_create (&thread, NULL, pthread_cond_wait_routine, NULL) == 0);
do
{
yield ();
ret = nanosleep (&remain, &remain);
ASSERT (ret >= -1);
}
while (ret == -1 && (remain.tv_sec != 0 || remain.tv_nsec != 0));
/* signal condition */
ASSERT (pthread_mutex_lock (&lockcond) == 0);
cond_value = 1;
ASSERT (pthread_cond_signal (&condtest) == 0);
ASSERT (pthread_mutex_unlock (&lockcond) == 0);
ASSERT (pthread_join (thread, NULL) == 0);
if (cond_value != 2)
abort ();
}
/*
* Timed Condition check
*/
static int cond_timeout;
static void
get_ts (struct timespec *ts)
{
struct timeval now;
gettimeofday (&now, NULL);
ts->tv_sec = now.tv_sec + 1;
ts->tv_nsec = now.tv_usec * 1000;
}
static void *
pthread_cond_timedwait_routine (void *arg)
{
int ret;
struct timespec ts;
ASSERT (pthread_mutex_lock (&lockcond) == 0);
while (!cond_value)
{
get_ts (&ts);
ret = pthread_cond_timedwait (&condtest, &lockcond, &ts);
if (ret == ETIMEDOUT)
cond_timeout = 1;
}
ASSERT (pthread_mutex_unlock (&lockcond) == 0);
return NULL;
}
static void
test_pthread_cond_timedwait (void)
{
struct timespec remain;
pthread_t thread;
int ret;
remain.tv_sec = 2;
remain.tv_nsec = 0;
cond_value = cond_timeout = 0;
ASSERT (pthread_create (&thread, NULL, pthread_cond_timedwait_routine, NULL)
== 0);
do
{
yield ();
ret = nanosleep (&remain, &remain);
ASSERT (ret >= -1);
}
while (ret == -1 && (remain.tv_sec != 0 || remain.tv_nsec != 0));
/* signal condition */
ASSERT (pthread_mutex_lock (&lockcond) == 0);
cond_value = 1;
ASSERT (pthread_cond_signal (&condtest) == 0);
ASSERT (pthread_mutex_unlock (&lockcond) == 0);
ASSERT (pthread_join (thread, NULL) == 0);
if (!cond_timeout)
abort ();
}
int
main ()
{
#if HAVE_DECL_ALARM
/* Declare failure if test takes too long, by using default abort
caused by SIGALRM. */
int alarm_value = 600;
signal (SIGALRM, SIG_DFL);
alarm (alarm_value);
#endif
ASSERT (pthread_cond_init (&condtest, NULL) == 0);
{
pthread_mutexattr_t attr;
ASSERT (pthread_mutexattr_init (&attr) == 0);
ASSERT (pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_NORMAL) == 0);
ASSERT (pthread_mutex_init (&lockcond, &attr) == 0);
ASSERT (pthread_mutexattr_destroy (&attr) == 0);
}
#if DO_TEST_COND
printf ("Starting test_pthread_cond_wait ..."); fflush (stdout);
test_pthread_cond_wait ();
printf (" OK\n"); fflush (stdout);
#endif
#if DO_TEST_TIMEDCOND
printf ("Starting test_pthread_cond_timedwait ..."); fflush (stdout);
test_pthread_cond_timedwait ();
printf (" OK\n"); fflush (stdout);
#endif
return 0;
}
#else
/* No multithreading available. */
#include <stdio.h>
int
main ()
{
fputs ("Skipping test: multithreading not enabled\n", stderr);
return 77;
}
#endif
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