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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 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include "glthread/cond.h"
#include "glthread/lock.h"
#include "glthread/thread.h"
#include "glthread/yield.h"
#if ENABLE_DEBUGGING
# define dbgprintf printf
#else
# define dbgprintf if (0) printf
#endif
#if EXPLICIT_YIELD
# define yield() gl_thread_yield ()
#else
# define yield()
#endif
/*
* Condition check
*/
static int cond_value = 0;
gl_cond_define_initialized(static, condtest)
gl_lock_define_initialized(static, lockcond)
static void *
cond_routine (void *arg)
{
gl_lock_lock (lockcond);
while (!cond_value)
{
gl_cond_wait (condtest, lockcond);
}
gl_lock_unlock (lockcond);
cond_value = 2;
return NULL;
}
static void
test_cond ()
{
int remain = 2;
gl_thread_t thread;
cond_value = 0;
thread = gl_thread_create (cond_routine, NULL);
do
{
yield ();
remain = sleep (remain);
}
while (remain);
/* signal condition */
gl_lock_lock (lockcond);
cond_value = 1;
gl_cond_signal (condtest);
gl_lock_unlock (lockcond);
gl_thread_join (thread, NULL);
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 *
timedcond_routine (void *arg)
{
int ret;
struct timespec ts;
gl_lock_lock (lockcond);
while (!cond_value)
{
get_ts (&ts);
ret = glthread_cond_timedwait (&condtest, &lockcond, &ts);
if (ret == ETIMEDOUT)
cond_timeout = 1;
}
gl_lock_unlock (lockcond);
return NULL;
}
static void
test_timedcond (void)
{
int remain = 2;
gl_thread_t thread;
cond_value = cond_timeout = 0;
thread = gl_thread_create (timedcond_routine, NULL);
do
{
yield ();
remain = sleep (remain);
}
while (remain);
/* signal condition */
gl_lock_lock (lockcond);
cond_value = 1;
gl_cond_signal (condtest);
gl_lock_unlock (lockcond);
gl_thread_join (thread, NULL);
if (!cond_timeout)
abort ();
}
int
main ()
{
#if DO_TEST_COND
printf ("Starting test_cond ..."); fflush (stdout);
test_cond ();
printf (" OK\n"); fflush (stdout);
#endif
#if DO_TEST_TIMEDCOND
printf ("Starting test_timedcond ..."); fflush (stdout);
test_timedcond ();
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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