/***********************************************************************
* timedwait.c
*
* Copyright (C) 2007 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 Gregory Nutt 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.
*
***********************************************************************/
#include <stdio.h>
#include <time.h>
#include <pthread.h>
#include <unistd.h>
#include "ostest.h"
static pthread_mutex_t mutex;
static pthread_cond_t cond;
static void *thread_waiter(void *parameter)
{
struct timespec time;
int status;
/* Take the mutex */
printf("%s: Taking mutex\n", __FUNCTION__);
status = pthread_mutex_lock(&mutex);
if (status != 0)
{
printf("%s: ERROR pthread_mutex_lock failed, status=%d\n", __FUNCTION__, status);
}
printf("%s: Starting 5 second wait for condition\n", __FUNCTION__);
status = clock_gettime(CLOCK_REALTIME, &time);
if (status != 0)
{
printf("%s: ERROR clock_gettime failed\n", __FUNCTION__);
}
time.tv_sec += 5;
/* The wait -- no-one is ever going to awaken us */
status = pthread_cond_timedwait(&cond, &mutex, &time);
if (status != 0)
{
printf("%s: ERROR pthread_cond_timedwait failed, status=%d\n", __FUNCTION__, status);
}
/* Release the mutex */
printf("%s: Releasing mutex\n", __FUNCTION__);
status = pthread_mutex_unlock(&mutex);
if (status != 0)
{
printf("%s: ERROR pthread_mutex_unlock failed, status=%d\n", __FUNCTION__, status);
}
printf("%s: Exit with status 0x12345678\n", __FUNCTION__);
pthread_exit((void*)0x12345678);
return NULL;
}
void timedwait_test(void)
{
pthread_t waiter;
pthread_attr_t attr;
struct sched_param sparam;
void *result;
int prio_max;
int status;
/* Initialize the mutex */
printf("%s: Initializing mutex\n", __FUNCTION__);
status = pthread_mutex_init(&mutex, NULL);
if (status != 0)
{
printf("%s: ERROR pthread_mutex_init failed, status=%d\n", __FUNCTION__, status);
}
/* Initialize the condition variable */
printf("%s: Initializing cond\n", __FUNCTION__);
status = pthread_cond_init(&cond, NULL);
if (status != 0)
{
printf("%s: ERROR pthread_condinit failed, status=%d\n", __FUNCTION__, status);
}
/* Start the waiter thread at higher priority */
printf("%s: Starting waiter\n", __FUNCTION__);
status = pthread_attr_init(&attr);
if (status != 0)
{
printf("%s: pthread_attr_init failed, status=%d\n", __FUNCTION__, status);
}
prio_max = sched_get_priority_max(SCHED_FIFO);
status = sched_getparam (getpid(), &sparam);
if (status != 0)
{
printf("%s: sched_getparam failed\n", __FUNCTION__);
sparam.sched_priority = PTHREAD_DEFAULT_PRIORITY;
}
sparam.sched_priority = (prio_max + sparam.sched_priority) / 2;
status = pthread_attr_setschedparam(&attr,&sparam);
if (status != OK)
{
printf("%s: pthread_attr_setschedparam failed, status=%d\n", __FUNCTION__, status);
}
else
{
printf("%s: Set thread 2 priority to %d\n", __FUNCTION__, sparam.sched_priority);
}
status = pthread_create(&waiter, &attr, thread_waiter, NULL);
if (status != 0)
{
printf("%s: pthread_create failed, status=%d\n", __FUNCTION__, status);
}
printf("%s: Joining\n", __FUNCTION__);
status = pthread_join(waiter, &result);
if (status != 0)
{
printf("%s: ERROR pthread_join failed, status=%d\n", __FUNCTION__, status);
}
else
{
printf("%s: waiter exited with result=%p\n", __FUNCTION__, result);
}
}