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/****************************************************************************
* 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);
}
}
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