152 lines
3.6 KiB
C
152 lines
3.6 KiB
C
/* Test of POSIX barriers.
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Copyright (C) 2002-2022 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 <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define NTHREADS 20
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#define ROUNDS 20
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static pthread_barrier_t barriers[NTHREADS];
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static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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static int counters[NTHREADS];
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static int serial[NTHREADS];
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static void *
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worker (void *arg)
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{
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void *result = NULL;
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int nr = (long int) arg;
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int i;
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for (i = 0; i < ROUNDS; ++i)
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{
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int j;
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int retval;
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if (nr == 0)
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{
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memset (counters, '\0', sizeof (counters));
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memset (serial, '\0', sizeof (serial));
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}
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retval = pthread_barrier_wait (&barriers[NTHREADS - 1]);
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if (retval != 0 && retval != PTHREAD_BARRIER_SERIAL_THREAD)
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{
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printf ("thread %d failed to wait for all the others\n", nr);
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result = (void *) 1;
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}
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for (j = nr; j < NTHREADS; ++j)
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{
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/* Increment the counter for this round. */
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pthread_mutex_lock (&lock);
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++counters[j];
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pthread_mutex_unlock (&lock);
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/* Wait for the rest. */
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retval = pthread_barrier_wait (&barriers[j]);
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/* Test the result. */
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if (nr == 0 && counters[j] != j + 1)
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{
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printf ("barrier in round %d released but count is %d\n",
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j, counters[j]);
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result = (void *) 1;
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}
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if (retval != 0)
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{
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if (retval != PTHREAD_BARRIER_SERIAL_THREAD)
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{
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printf ("thread %d in round %d has nonzero return value != PTHREAD_BARRIER_SERIAL_THREAD\n",
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nr, j);
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result = (void *) 1;
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}
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else
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{
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pthread_mutex_lock (&lock);
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++serial[j];
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pthread_mutex_unlock (&lock);
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}
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}
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/* Wait for the rest again. */
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retval = pthread_barrier_wait (&barriers[j]);
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/* Now we can check whether exactly one thread was serializing. */
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if (nr == 0 && serial[j] != 1)
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{
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printf ("not exactly one serial thread in round %d\n", j);
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result = (void *) 1;
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}
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}
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}
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return result;
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}
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#define TEST_FUNCTION do_test ()
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#define TIMEOUT 60
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static int
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do_test (void)
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{
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pthread_t threads[NTHREADS];
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int i;
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void *res;
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int result = 0;
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/* Initialized the barrier variables. */
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for (i = 0; i < NTHREADS; ++i)
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if (pthread_barrier_init (&barriers[i], NULL, i + 1) != 0)
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{
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printf ("Failed to initialize barrier %d\n", i);
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exit (1);
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}
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/* Start the threads. */
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for (i = 0; i < NTHREADS; ++i)
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if (pthread_create (&threads[i], NULL, worker, (void *) (long int) i) != 0)
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{
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printf ("Failed to start thread %d\n", i);
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exit (1);
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}
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/* And wait for them. */
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for (i = 0; i < NTHREADS; ++i)
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if (pthread_join (threads[i], &res) != 0 || res != NULL)
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{
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printf ("thread %d returned a failure\n", i);
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result = 1;
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}
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else
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printf ("joined threads %d\n", i);
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if (result == 0)
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puts ("all OK");
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return result;
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}
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#include "../test-skeleton.c"
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