98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
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/* C11 threads condition broadcast variable tests.
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Copyright (C) 2018-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <threads.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <support/check.h>
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/* Condition variable where child threads will wait. */
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static cnd_t cond;
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/* Mutex to control wait on cond. */
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static mtx_t mutex;
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/* Number of threads which have entered the cnd_wait region. */
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static unsigned int waiting_threads;
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/* Code executed by each thread. */
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static int
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child_wait (void* data)
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{
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/* Wait until parent thread sends broadcast here. */
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mtx_lock (&mutex);
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++waiting_threads;
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cnd_wait (&cond, &mutex);
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mtx_unlock (&mutex);
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thrd_exit (thrd_success);
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}
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#define N 5
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static int
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do_test (void)
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{
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thrd_t ids[N];
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unsigned char i;
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if (cnd_init (&cond) != thrd_success)
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FAIL_EXIT1 ("cnd_init failed");
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if (mtx_init (&mutex, mtx_plain) != thrd_success)
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FAIL_EXIT1 ("mtx_init failed");
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/* Create N new threads. */
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for (i = 0; i < N; ++i)
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{
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if (thrd_create (&ids[i], child_wait, NULL) != thrd_success)
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FAIL_EXIT1 ("thrd_create failed");
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}
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/* Wait for other threads to reach their wait func. */
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while (true)
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{
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mtx_lock (&mutex);
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TEST_VERIFY (waiting_threads <= N);
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bool done_waiting = waiting_threads == N;
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mtx_unlock (&mutex);
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if (done_waiting)
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break;
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thrd_sleep (&((struct timespec){.tv_nsec = 100 * 1000 * 1000}), NULL);
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}
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mtx_lock (&mutex);
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if (cnd_broadcast (&cond) != thrd_success)
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FAIL_EXIT1 ("cnd_broadcast failed");
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mtx_unlock (&mutex);
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for (i = 0; i < N; ++i)
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{
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if (thrd_join (ids[i], NULL) != thrd_success)
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FAIL_EXIT1 ("thrd_join failed");
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}
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mtx_destroy (&mutex);
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cnd_destroy (&cond);
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return 0;
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}
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#include <support/test-driver.c>
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