forked from Archive/PX4-Autopilot
150 lines
4.7 KiB
C
150 lines
4.7 KiB
C
/****************************************************************************
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* examples/elf/tests/mutex/mutex.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <pthread.h>
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/****************************************************************************
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* Private Data
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****************************************************************************/
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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 volatile bool bendoftest;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/* NOTE: it is necessary for functions that are referred to by function pointers
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* pointer to be declared with global scope (at least for ARM). Otherwise,
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* a relocation type that is not supported by ELF is generated by GCC.
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*/
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void thread_func(void *parameter)
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{
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int my_id = (int)parameter;
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int my_ndx = my_id - 1;
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int i;
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/* Loop 20 times. There is a 100 MS delay in the loop so this should
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* take about 2 seconds. The main thread will stop this thread after
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* 2 seconds by setting bendoftest in any event.
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*/
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for (i = 0; i < 20 && !bendoftest; i++);
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{
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if ((pthread_mutex_lock(&mut)) != 0)
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{
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printf("ERROR thread %d: pthread_mutex_lock failed\n", my_id);
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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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my_id, my_mutex);
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nerrors[my_ndx]++;
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}
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my_mutex = 1;
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usleep(100000);
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my_mutex = 0;
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if ((pthread_mutex_unlock(&mut)) != 0)
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{
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printf("ERROR thread %d: pthread_mutex_unlock failed\n", my_id);
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}
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nloops[my_ndx]++;
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int main(int argc, char **argv)
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{
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pthread_t thread1;
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pthread_t thread2;
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/* Initialize the mutex */
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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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bendoftest = false;
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if ((pthread_create(&thread1, NULL, (void*)thread_func, (void*)1)) != 0)
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{
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fprintf(stderr, "Error in thread#1 creation\n");
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}
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printf("Starting thread 2\n");
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if ((pthread_create(&thread2, NULL, (void*)thread_func, (void*)2)) != 0)
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{
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fprintf(stderr, "Error in thread#2 creation\n");
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}
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/* Wait a bit for the threads to do their thing. */
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sleep(2);
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/* Then ask them politely to stop running */
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printf("Stopping threads\n");
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bendoftest = true;
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pthread_join(thread1, NULL);
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pthread_join(thread2, NULL);
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printf("\tThread1\tThread2\n");
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printf("Loops\t%ld\t%ld\n", nloops[0], nloops[1]);
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printf("Errors\t%ld\t%ld\n", nerrors[0], nerrors[1]);
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return 0;
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}
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