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/***********************************************************************
* mutex.c
*
* Copyright (C) 2007, 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 NLOOPS 32
static pthread_mutex_t mut;
static volatile int my_mutex = 0;
static unsigned long nloops[2] = {0, 0};
static unsigned long nerrors[2] = {0, 0};
static void *thread_func(void *parameter)
{
int id = (int)parameter;
int ndx = id - 1;
int i;
for (nloops[ndx] = 0; nloops[ndx] < NLOOPS; nloops[ndx]++)
{
int status = pthread_mutex_lock(&mut);
if (status != 0)
{
printf("ERROR thread %d: pthread_mutex_lock failed, status=%d\n",
id, status);
}
if (my_mutex == 1)
{
printf("ERROR thread=%d: "
"my_mutex should be zero, instead my_mutex=%d\n",
id, my_mutex);
nerrors[ndx]++;
}
my_mutex = 1;
for (i = 0; i < 10; i++)
{
pthread_yield();
}
my_mutex = 0;
status = pthread_mutex_unlock(&mut);
if (status != 0)
{
printf("ERROR thread %d: pthread_mutex_unlock failed, status=%d\n",
id, status);
}
}
pthread_exit(NULL);
return NULL; /* Non-reachable -- needed for some compilers */
}
void mutex_test(void)
{
pthread_t thread1, thread2;
#ifdef SDCC
pthread_addr_t result1, result2;
pthread_attr_t attr;
#endif
int status;
/* Initialize the mutex */
printf("Initializing mutex\n");
pthread_mutex_init(&mut, NULL);
/* Start two thread instances */
printf("Starting thread 1\n");
#ifdef SDCC
(void)pthread_attr_init(&attr);
status = pthread_create(&thread1, &attr, thread_func, (pthread_addr_t)1);
#else
status = pthread_create(&thread1, NULL, thread_func, (pthread_addr_t)1);
#endif
if (status != 0)
{
printf("Error in thread#1 creation\n");
}
printf("Starting thread 2\n");
#ifdef SDCC
status = pthread_create(&thread2, &attr, thread_func, (pthread_addr_t)2);
#else
status = pthread_create(&thread2, NULL, thread_func, (pthread_addr_t)2);
#endif
if (status != 0)
{
printf("Error in thread#2 creation\n");
}
#ifdef SDCC
pthread_join(thread1, &result1);
pthread_join(thread2, &result2);
#else
pthread_join(thread1, NULL);
pthread_join(thread2, NULL);
#endif
printf("\t\tThread1\tThread2\n");
printf("\tLoops\t%ld\t%ld\n", nloops[0], nloops[1]);
printf("\tErrors\t%ld\t%ld\n", nerrors[0], nerrors[1]);
}
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