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/***********************************************************************
* apps/examples/ostest/semtimed.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <pthread.h>
#include <semaphore.h>
#include <time.h>
#include <sched.h>
#include <errno.h>
#include "ostest.h"
/***********************************************************************
* Preprocessor Definitions
***********************************************************************/
#ifndef NULL
# define NULL (void*)0
#endif
/***********************************************************************
* Private Data
***********************************************************************/
static sem_t sem;
/***********************************************************************
* Private Functions
***********************************************************************/
static void *poster_func(void *parameter)
{
/* Wait for one second, then post the semaphore */
printf("poster_func: Waiting for 1 second\n");
sleep(1);
printf("poster_func: Posting\n");
sem_post(&sem);
return NULL;
}
/***********************************************************************
* Public Functions
***********************************************************************/
void semtimed_test(void)
{
pthread_t poster_thread = (pthread_t)0;
#ifdef SDCC
pthread_addr_t result;
#endif
struct sched_param sparam;
struct timespec abstime;
struct timespec before;
struct timespec after;
int prio_min;
int prio_max;
int prio_mid;
pthread_attr_t attr;
int status;
printf("semtimed_test: Initializing semaphore to 0\n");
sem_init(&sem, 0, 0);
/* First, make sure that the timeout expires if the semaphore is never posted */
(void)clock_gettime(CLOCK_REALTIME, &before);
abstime.tv_sec = before.tv_sec + 2;
abstime.tv_nsec = before.tv_nsec;
printf("semtimed_test: Waiting for two second timeout\n");
status = sem_timedwait(&sem, &abstime);
(void)clock_gettime(CLOCK_REALTIME, &after);
if (status == OK)
{
printf("semtimed_test: ERROR: sem_timedwait succeeded\n");
}
else
{
int errcode = errno;
if (errcode == ETIMEDOUT)
{
printf("samwait_test: PASS\n");
}
else
{
printf("semtimed_test: ERROR: sem_timedwait failed with: %d\n", errcode);
}
}
(void)clock_gettime(CLOCK_REALTIME, &after);
printf("BEFORE: (%lu sec, %lu nsec)\n",
(unsigned long)before.tv_sec, (unsigned long)before.tv_nsec);
printf("AFTER: (%lu sec, %lu nsec)\n",
(unsigned long)after.tv_sec, (unsigned long)after.tv_nsec);
/* Now make sure that the time wait returns successfully if the semaphore is posted */
/* Start a poster thread. It will wait 1 seconds and post the semaphore */
printf("semtimed_test: Starting poster thread\n");
status = pthread_attr_init(&attr);
if (status != OK)
{
printf("semtimed_test: ERROR: pthread_attr_init failed, status=%d\n", status);
}
prio_min = sched_get_priority_min(SCHED_FIFO);
prio_max = sched_get_priority_max(SCHED_FIFO);
prio_mid = (prio_min + prio_max) / 2;
sparam.sched_priority = (prio_mid + prio_max) / 2;
status = pthread_attr_setschedparam(&attr,&sparam);
if (status != OK)
{
printf("semtimed_test: ERROR: pthread_attr_setschedparam failed, status=%d\n", status);
}
else
{
printf("semtimed_test: Set thread 1 priority to %d\n", sparam.sched_priority);
}
printf("semtimed_test: Starting poster thread 3\n");
status = pthread_attr_init(&attr);
if (status != 0)
{
printf("semtimed_test: ERROR: pthread_attr_init failed, status=%d\n", status);
}
sparam.sched_priority = (prio_min + prio_mid) / 2;
status = pthread_attr_setschedparam(&attr,&sparam);
if (status != OK)
{
printf("semtimed_test: pthread_attr_setschedparam failed, status=%d\n", status);
}
else
{
printf("semtimed_test: Set thread 3 priority to %d\n", sparam.sched_priority);
}
status = pthread_create(&poster_thread, &attr, poster_func, NULL);
if (status != 0)
{
printf("semtimed_test: ERROR: Poster thread creation failed: %d\n", status);
sem_destroy(&sem);
return;
}
/* Up to two seconds for the semaphore to be posted */
(void)clock_gettime(CLOCK_REALTIME, &before);
abstime.tv_sec = before.tv_sec + 2;
abstime.tv_nsec = before.tv_nsec;
printf("semtimed_test: Waiting for two second timeout\n");
status = sem_timedwait(&sem, &abstime);
(void)clock_gettime(CLOCK_REALTIME, &after);
if (status < 0)
{
int errcode = errno;
printf("semtimed_test: ERROR: sem_timedwait failed with: %d\n", errcode);
}
else
{
printf("semtimed_test: PASS: sem_timedwait succeeded\n");
}
(void)clock_gettime(CLOCK_REALTIME, &after);
printf("BEFORE: (%lu sec, %lu nsec)\n",
(unsigned long)before.tv_sec, (unsigned long)before.tv_nsec);
printf("AFTER: (%lu sec, %lu nsec)\n",
(unsigned long)after.tv_sec, (unsigned long)after.tv_nsec);
/* Clean up detritus left by the pthread */
#ifdef SDCC
if (poster_thread != (pthread_t)0)
{
pthread_join(poster_thread, &result);
}
#else
if (poster_thread != (pthread_t)0)
{
pthread_join(poster_thread, NULL);
}
#endif
sem_destroy(&sem);
}
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