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/***********************************************************************
* rmutex.c
*
* Copyright (C) 2008 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.
*
***********************************************************************/
#include <stdio.h>
#include <pthread.h>
#include "ostest.h"
#ifndef NULL
# define NULL (void*)0
#endif
#define NTHREADS 3
#define NLOOPS 3
#define NRECURSIONS 3
static pthread_mutex_t mut;
static void thread_inner(int id, int level)
{
int status;
if (level < NRECURSIONS)
{
/* Take the mutex */
printf("thread_inner[%d, %d]: Locking\n", id, level);
status = pthread_mutex_lock(&mut);
if (status != 0)
{
printf("thread_inner[%d, %d]: ERROR pthread_mutex_lock failed: %d\n",
id, level, status);
}
printf("thread_inner[%d, %d]: Locked\n", id, level);
/* Give the other threads a chance */
pthread_yield();
thread_inner(id, level+1);
pthread_yield();
/* Unlock the mutex */
printf("thread_inner[%d, %d]: Unlocking\n", id, level);
status = pthread_mutex_unlock(&mut);
if (status != 0)
{
printf("thread_inner[%d, %d]: ERROR pthread_mutex_unlock failed: %d\n",
id, level, status);
}
printf("thread_inner[%d, %d]: Unlocked\n", id, level);
pthread_yield();
}
}
static void *thread_outer(void *parameter)
{
int i;
printf("thread_outer[%d]: Started\n", (int)parameter);
for (i = 0; i < NLOOPS; i++)
{
printf("thread_outer[%d]: Loop %d\n", (int)parameter, i);
thread_inner((int)parameter, 0);
}
printf("thread_outer[%d]: Exitting\n", (int)parameter);
pthread_exit(NULL);
return NULL; /* Non-reachable -- needed for some compilers */
}
void recursive_mutex_test(void)
{
pthread_t thread[NTHREADS];
#ifdef SDCC
pthread_addr_t result[NTHREADS];
pthread_attr_t attr;
#endif
pthread_mutexattr_t mattr;
int type;
int status;
int i;
/* Initialize the mutex attributes */
pthread_mutexattr_init(&mattr);
status = pthread_mutexattr_settype(&mattr, PTHREAD_MUTEX_RECURSIVE);
if (status != 0)
{
printf("recursive_mutex_test: ERROR pthread_mutexattr_settype failed, status=%d\n", status);
}
status = pthread_mutexattr_gettype(&mattr, &type);
if (status != 0)
{
printf("recursive_mutex_test: ERROR pthread_mutexattr_gettype failed, status=%d\n", status);
}
if (type != PTHREAD_MUTEX_RECURSIVE)
{
printf("recursive_mutex_test: ERROR pthread_mutexattr_gettype return type=%d\n", type);
}
/* Initialize the mutex */
printf("recursive_mutex_test: Initializing mutex\n");
pthread_mutex_init(&mut, &mattr);
/* Start the threads -- all at the same, default priority */
for (i = 0; i < NTHREADS; i++)
{
printf("recursive_mutex_test: Starting thread %d\n", i+1);
#ifdef SDCC
(void)pthread_attr_init(&attr);
status = pthread_create(&thread[i], &attr, thread_outer, (pthread_addr_t)i+1);
#else
status = pthread_create(&thread[i], NULL, thread_outer, (pthread_addr_t)i+1);
#endif
if (status != 0)
{
printf("recursive_mutex_test: ERRROR thread#%d creation: %d\n", i+1, status);
}
}
/* Wait for all; of the threads to complete */
for (i = 0; i < NTHREADS; i++)
{
printf("recursive_mutex_test: Waiting for thread %d\n", i+1);
#ifdef SDCC
pthread_join(thread[i], &result1);
#else
pthread_join(thread[i], NULL);
#endif
}
printf("recursive_mutex_test: Complete\n");
}
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