143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/***********************************************************************
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* mutex.c
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*
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* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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***********************************************************************/
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#include <stdio.h>
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#include <pthread.h>
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#include "ostest.h"
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#ifndef NULL
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# define NULL (void*)0
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#endif
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#define NLOOPS 32
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static pthread_mutex_t mut;
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static volatile int my_mutex = 0;
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static unsigned long nloops[2] = {0, 0};
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static unsigned long nerrors[2] = {0, 0};
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static void *thread_func(void *parameter)
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{
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int id = (int)parameter;
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int ndx = id - 1;
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int i;
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for (nloops[ndx] = 0; nloops[ndx] < NLOOPS; nloops[ndx]++)
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{
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int status = pthread_mutex_lock(&mut);
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if (status != 0)
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{
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printf("ERROR thread %d: pthread_mutex_lock failed, status=%d\n",
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id, status);
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}
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if (my_mutex == 1)
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{
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printf("ERROR thread=%d: "
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"my_mutex should be zero, instead my_mutex=%d\n",
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id, my_mutex);
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nerrors[ndx]++;
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}
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my_mutex = 1;
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for (i = 0; i < 10; i++)
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{
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pthread_yield();
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}
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my_mutex = 0;
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status = pthread_mutex_unlock(&mut);
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if (status != 0)
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{
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printf("ERROR thread %d: pthread_mutex_unlock failed, status=%d\n",
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id, status);
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}
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}
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pthread_exit(NULL);
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return NULL; /* Non-reachable -- needed for some compilers */
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}
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void mutex_test(void)
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{
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pthread_t thread1, thread2;
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#ifdef SDCC
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pthread_addr_t result1, result2;
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pthread_attr_t attr;
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#endif
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int status;
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/* Initialize the mutex */
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printf("Initializing mutex\n");
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pthread_mutex_init(&mut, NULL);
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/* Start two thread instances */
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printf("Starting thread 1\n");
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#ifdef SDCC
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(void)pthread_attr_init(&attr);
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status = pthread_create(&thread1, &attr, thread_func, (pthread_addr_t)1);
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#else
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status = pthread_create(&thread1, NULL, thread_func, (pthread_addr_t)1);
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#endif
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if (status != 0)
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{
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printf("Error in thread#1 creation\n");
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}
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printf("Starting thread 2\n");
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#ifdef SDCC
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status = pthread_create(&thread2, &attr, thread_func, (pthread_addr_t)2);
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#else
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status = pthread_create(&thread2, NULL, thread_func, (pthread_addr_t)2);
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#endif
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if (status != 0)
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{
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printf("Error in thread#2 creation\n");
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}
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#ifdef SDCC
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pthread_join(thread1, &result1);
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pthread_join(thread2, &result2);
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#else
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pthread_join(thread1, NULL);
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pthread_join(thread2, NULL);
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#endif
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printf("\t\tThread1\tThread2\n");
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printf("\tLoops\t%ld\t%ld\n", nloops[0], nloops[1]);
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printf("\tErrors\t%ld\t%ld\n", nerrors[0], nerrors[1]);
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}
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