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92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/* Test for sem_post race: bug 14532.
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Copyright (C) 2012-2020 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 <semaphore.h>
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#include <stdio.h>
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#define NTHREADS 10
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#define NITER 100000
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sem_t sem;
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int c;
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volatile int thread_fail;
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static void *
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tf (void *arg)
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{
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for (int i = 0; i < NITER; i++)
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{
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if (sem_wait (&sem) != 0)
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{
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perror ("sem_wait");
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thread_fail = 1;
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}
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++c;
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if (sem_post (&sem) != 0)
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{
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perror ("sem_post");
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thread_fail = 1;
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}
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}
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return NULL;
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}
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static int
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do_test (void)
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{
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if (sem_init (&sem, 0, 0) != 0)
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{
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perror ("sem_init");
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return 1;
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}
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pthread_t th[NTHREADS];
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for (int i = 0; i < NTHREADS; i++)
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{
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if (pthread_create (&th[i], NULL, tf, NULL) != 0)
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{
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puts ("pthread_create failed");
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return 1;
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}
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}
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if (sem_post (&sem) != 0)
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{
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perror ("sem_post");
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return 1;
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}
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for (int i = 0; i < NTHREADS; i++)
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if (pthread_join (th[i], NULL) != 0)
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{
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puts ("pthread_join failed");
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return 1;
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}
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if (c != NTHREADS * NITER)
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{
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printf ("c = %d, should be %d\n", c, NTHREADS * NITER);
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return 1;
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}
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return thread_fail;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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