/***********************************************************************
* apps/examples/nsem.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 <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <sched.h>
#include <errno.h>
#include "ostest.h"
#ifdef CONFIG_FS_NAMED_SEMAPHORES
/***********************************************************************
* Pre-processor Definitions
***********************************************************************/
#define SEM1_NAME "foo"
#define SEM2_NAME "bar"
#ifndef NULL
# define NULL (void*)0
#endif
/***********************************************************************
* Private Data
***********************************************************************/
/***********************************************************************
* Private Functions
***********************************************************************/
static FAR void *nsem_peer(void *parameter)
{
FAR sem_t *sem1;
FAR sem_t *sem2;
/* Open semaphore 1. This should have already been created by
* nsem_test().
*/
printf("nsem_peer: Open semaphore 1\n");
sem1 = sem_open(SEM1_NAME, 0);
if (sem1 == (FAR sem_t*)ERROR)
{
int errcode = errno;
printf("nsem_peer: ERROR: sem_open(1) failed: %d\n", errcode);
return NULL;
}
/* Open semaphore 2. We will create that one */
printf("nsem_peer: Create semaphore 2 with value == 0\n");
sem2 = sem_open(SEM2_NAME, O_CREAT|O_EXCL, 0644, 0);
if (sem1 == (FAR sem_t*)ERROR)
{
int errcode = errno;
printf("nsem_peer: ERROR: sem_open(2) failed: %d\n", errcode);
return NULL;
}
/* Post and discard semaphore 1 */
printf("nsem_peer: Post, close, and unlink semaphore 1\n");
sem_post(sem1);
sem_close(sem1);
sem_unlink(SEM1_NAME);
/* Now post and close semaphore 2 */
printf("nsem_peer: Post and close semaphore 2\n");
sem_post(sem2);
sem_close(sem2);
return NULL;
}
/***********************************************************************
* Public Functions
***********************************************************************/
void nsem_test(void)
{
pthread_t peer = (pthread_t)0;
#ifdef SDCC
pthread_addr_t result;
#endif
FAR sem_t *sem1;
FAR sem_t *sem2;
struct sched_param sparam;
int prio_min;
int prio_max;
int prio_mid;
pthread_attr_t attr;
int status;
/* Open semaphore 2. We will create that one */
printf("nsem_test: Create semaphore 1 with value == 0\n");
sem1 = sem_open(SEM1_NAME, O_CREAT|O_EXCL, 0644, 0);
if (sem1 == (FAR sem_t*)ERROR)
{
int errcode = errno;
printf("nsem_peer: ERROR: sem_open(1) failed: %d\n", errcode);
return;
}
/* Start the peer thread */
printf("nsem_test: Starting peer peer\n");
status = pthread_attr_init(&attr);
if (status != OK)
{
printf("nsem_test: 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("nsem_test: ERROR: pthread_attr_setschedparam failed, status=%d\n", status);
}
else
{
printf("nsem_test: Set peer priority to %d\n", sparam.sched_priority);
}
status = pthread_create(&peer, &attr, nsem_peer, NULL);
if (status != 0)
{
printf("nsem_test: ERROR: Peer thread creation failed: %d\n", status);
return;
}
/* Wait for the peer to post semaphore 1 */
printf("nsem_test: Wait on semaphore 1\n");
status = sem_wait(sem1);
if (status < 0)
{
int errcode = errno;
printf("nsem_test: ERROR: sem_wait(1) failed: %d\n", errcode);
pthread_cancel(peer);
return;
}
/* Close sem1. It should already have been unlinked by the nsem_peer */
printf("nsem_test: Close semaphore 1\n");
sem_close(sem1);
/* Open semaphore 2. This should have already been created by
* nsem_peer().
*/
printf("nsem_test: Open semaphore 2\n");
sem2 = sem_open(SEM2_NAME, 0);
if (sem2 == (FAR sem_t*)ERROR)
{
int errcode = errno;
printf("nsem_test: ERROR: sem_open(2) failed: %d\n", errcode);
pthread_cancel(peer);
return;
}
/* Wait for the peer to post semaphore 2 */
printf("nsem_test: Wait on semaphore 2\n");
status = sem_wait(sem2);
if (status < 0)
{
int errcode = errno;
printf("nsem_test: ERROR: sem_wait(1) failed: %d\n", errcode);
pthread_cancel(peer);
return;
}
/* Close and unlink semaphore 2 */
printf("nsem_test: Close and unlink semaphore 2\n");
sem_close(sem2);
sem_unlink(SEM2_NAME);
#ifdef SDCC
if (peer != (pthread_t)0)
{
pthread_join(peer, &result);
}
#else
if (peer != (pthread_t)0)
{
pthread_join(peer, NULL);
}
#endif
}
#endif /* CONFIG_FS_NAMED_SEMAPHORES */
