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Diffstat (limited to 'apps/examples/ostest/barrier.c')
| -rw-r--r-- | apps/examples/ostest/barrier.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/apps/examples/ostest/barrier.c b/apps/examples/ostest/barrier.c new file mode 100644 index 000000000..c88e1bed1 --- /dev/null +++ b/apps/examples/ostest/barrier.c @@ -0,0 +1,200 @@ +/**************************************************************************** + * examples/ostest/barrier.c + * + * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <stdio.h> +#include <unistd.h> +#include <pthread.h> + +#include "ostest.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +#define HALF_SECOND 500000L + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static pthread_barrier_t barrier; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: barrier_func + ****************************************************************************/ + +static void *barrier_func(void *parameter) +{ + int id = (int)parameter; + int status; + + printf("barrier_func: Thread %d started\n", id); +#ifndef CONFIG_DISABLE_SIGNALS + usleep(HALF_SECOND); +#endif + + /* Wait at the barrier until all threads are synchronized. */ + + printf("barrier_func: Thread %d calling pthread_barrier_wait()\n", + id); + status = pthread_barrier_wait(&barrier); + if (status == 0) + { + printf("barrier_func: Thread %d, back with " + "status=0 (I am not special)\n", + id, status); + } + else if (status == PTHREAD_BARRIER_SERIAL_THREAD) + { + printf("barrier_func: Thread %d, back with " + "status=PTHREAD_BARRIER_SERIAL_THREAD (I AM SPECIAL)\n", + id, status); + } + else + { + printf("barrier_func: ERROR thread %d could not get semaphore value\n", + id); + } + +#ifndef CONFIG_DISABLE_SIGNALS + usleep(HALF_SECOND); +#endif + printf("barrier_func: Thread %d done\n", id); + return NULL; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: barrier_test + ****************************************************************************/ + +void barrier_test(void) +{ + pthread_t barrier_thread[CONFIG_EXAMPLES_OSTEST_NBARRIER_THREADS]; + pthread_addr_t result; + pthread_attr_t attr; + pthread_barrierattr_t barrierattr; + int status; + int i; + + printf("barrier_test: Initializing barrier\n"); + + status = pthread_barrierattr_init(&barrierattr); + if (status != OK) + { + printf("barrier_test: pthread_barrierattr_init failed, status=%d\n", + status); + } + + status = pthread_barrier_init(&barrier, &barrierattr, + CONFIG_EXAMPLES_OSTEST_NBARRIER_THREADS); + if (status != OK) + { + printf("barrier_test: pthread_barrierattr_init failed, status=%d\n", + status); + } + + /* Create the barrier */ + + status = pthread_barrierattr_init(&barrierattr); + + /* Start CONFIG_EXAMPLES_OSTEST_NBARRIER_THREADS thread instances */ + + status = pthread_attr_init(&attr); + if (status != OK) + { + printf("barrier_test: pthread_attr_init failed, status=%d\n", + status); + } + + for (i = 0; i < CONFIG_EXAMPLES_OSTEST_NBARRIER_THREADS; i++) + { + status = pthread_create(&barrier_thread[i], &attr, barrier_func, + (pthread_addr_t)i); + if (status != 0) + { + printf("barrier_test: Error in thread %d create, status=%d\n", + i, status); + } + else + { + printf("barrier_test: Thread %d created\n", i); + } + } + + /* Wait for all thread instances to complete */ + + for (i = 0; i < CONFIG_EXAMPLES_OSTEST_NBARRIER_THREADS; i++) + { + status = pthread_join(barrier_thread[i], &result); + if (status != 0) + { + printf("barrier_test: Error in thread %d join, status=%d\n", + i, status); + } + else + { + printf("barrier_test: Thread %d completed with result=%p\n", + i, result); + } + } + + /* Destroy the barrier */ + + status = pthread_barrier_destroy(&barrier); + if (status != OK) + { + printf("barrier_test: pthread_barrier_destroy failed, status=%d\n", + status); + } + + status = pthread_barrierattr_destroy(&barrierattr); + if (status != OK) + { + printf("barrier_test: pthread_barrierattr_destroy failed, status=%d\n", + status); + } +} |