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/* C11 threads condition broadcast variable tests.
Copyright (C) 2018-2024 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 <threads.h>
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
#include <support/check.h>
/* Condition variable where child threads will wait. */
static cnd_t cond;
/* Mutex to control wait on cond. */
static mtx_t mutex;
/* Number of threads which have entered the cnd_wait region. */
static unsigned int waiting_threads;
/* Code executed by each thread. */
static int
child_wait (void* data)
{
/* Wait until parent thread sends broadcast here. */
mtx_lock (&mutex);
++waiting_threads;
cnd_wait (&cond, &mutex);
mtx_unlock (&mutex);
thrd_exit (thrd_success);
}
#define N 5
static int
do_test (void)
{
thrd_t ids[N];
unsigned char i;
if (cnd_init (&cond) != thrd_success)
FAIL_EXIT1 ("cnd_init failed");
if (mtx_init (&mutex, mtx_plain) != thrd_success)
FAIL_EXIT1 ("mtx_init failed");
/* Create N new threads. */
for (i = 0; i < N; ++i)
{
if (thrd_create (&ids[i], child_wait, NULL) != thrd_success)
FAIL_EXIT1 ("thrd_create failed");
}
/* Wait for other threads to reach their wait func. */
while (true)
{
mtx_lock (&mutex);
TEST_VERIFY (waiting_threads <= N);
bool done_waiting = waiting_threads == N;
mtx_unlock (&mutex);
if (done_waiting)
break;
thrd_sleep (&((struct timespec){.tv_nsec = 100 * 1000 * 1000}), NULL);
}
mtx_lock (&mutex);
if (cnd_broadcast (&cond) != thrd_success)
FAIL_EXIT1 ("cnd_broadcast failed");
mtx_unlock (&mutex);
for (i = 0; i < N; ++i)
{
if (thrd_join (ids[i], NULL) != thrd_success)
FAIL_EXIT1 ("thrd_join failed");
}
mtx_destroy (&mutex);
cnd_destroy (&cond);
return 0;
}
#include <support/test-driver.c>
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