/* Copyright (C) 2002-2014 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. 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 <http://www.gnu.org/licenses/>. */ /* Test of POSIX barriers. */ #include <pthread.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #define NTHREADS 20 #define ROUNDS 20 static pthread_barrier_t barriers[NTHREADS]; static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; static int counters[NTHREADS]; static int serial[NTHREADS]; static void * worker (void *arg) { void *result = NULL; int nr = (long int) arg; int i; for (i = 0; i < ROUNDS; ++i) { int j; int retval; if (nr == 0) { memset (counters, '\0', sizeof (counters)); memset (serial, '\0', sizeof (serial)); } retval = pthread_barrier_wait (&barriers[NTHREADS - 1]); if (retval != 0 && retval != PTHREAD_BARRIER_SERIAL_THREAD) { printf ("thread %d failed to wait for all the others\n", nr); result = (void *) 1; } for (j = nr; j < NTHREADS; ++j) { /* Increment the counter for this round. */ pthread_mutex_lock (&lock); ++counters[j]; pthread_mutex_unlock (&lock); /* Wait for the rest. */ retval = pthread_barrier_wait (&barriers[j]); /* Test the result. */ if (nr == 0 && counters[j] != j + 1) { printf ("barrier in round %d released but count is %d\n", j, counters[j]); result = (void *) 1; } if (retval != 0) { if (retval != PTHREAD_BARRIER_SERIAL_THREAD) { printf ("thread %d in round %d has nonzero return value != PTHREAD_BARRIER_SERIAL_THREAD\n", nr, j); result = (void *) 1; } else { pthread_mutex_lock (&lock); ++serial[j]; pthread_mutex_unlock (&lock); } } /* Wait for the rest again. */ retval = pthread_barrier_wait (&barriers[j]); /* Now we can check whether exactly one thread was serializing. */ if (nr == 0 && serial[j] != 1) { printf ("not exactly one serial thread in round %d\n", j); result = (void *) 1; } } } return result; } #define TEST_FUNCTION do_test () #define TIMEOUT 60 static int do_test (void) { pthread_t threads[NTHREADS]; int i; void *res; int result = 0; /* Initialized the barrier variables. */ for (i = 0; i < NTHREADS; ++i) if (pthread_barrier_init (&barriers[i], NULL, i + 1) != 0) { printf ("Failed to initialize barrier %d\n", i); exit (1); } /* Start the threads. */ for (i = 0; i < NTHREADS; ++i) if (pthread_create (&threads[i], NULL, worker, (void *) (long int) i) != 0) { printf ("Failed to start thread %d\n", i); exit (1); } /* And wait for them. */ for (i = 0; i < NTHREADS; ++i) if (pthread_join (threads[i], &res) != 0 || res != NULL) { printf ("thread %d returned a failure\n", i); result = 1; } else printf ("joined threads %d\n", i); if (result == 0) puts ("all OK"); return result; } #include "../test-skeleton.c"