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Diffstat (limited to 'nuttx/examples/ostest/mutex.c')
-rw-r--r-- | nuttx/examples/ostest/mutex.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/nuttx/examples/ostest/mutex.c b/nuttx/examples/ostest/mutex.c new file mode 100644 index 0000000000..d6cad9e39f --- /dev/null +++ b/nuttx/examples/ostest/mutex.c @@ -0,0 +1,120 @@ +/*********************************************************************** + * mutex.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt 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); +} + +void mutex_test(void) +{ + pthread_t thread1, thread2; + + /* Initialize the mutex */ + + printf("Initializing mutex\n"); + pthread_mutex_init(&mut, NULL); + + /* Start two thread instances */ + + printf("Starting thread 1\n"); + if ((pthread_create(&thread1, NULL, thread_func, (void*)1)) != 0) + { + printf("Error in thread#1 creation\n"); + } + + printf("Starting thread 2\n"); + if ((pthread_create(&thread2, NULL, thread_func, (void*)2)) != 0) + { + printf("Error in thread#2 creation\n"); + } + + pthread_join(thread1, NULL); + pthread_join(thread2, NULL); + + printf("%s:\t\tThread1\tThread2\n", __FUNCTION__); + printf("%s:\tLoops\t%ld\t%ld\n", __FUNCTION__, nloops[0], nloops[1]); + printf("%s:\tErrors\t%ld\t%ld\n", __FUNCTION__, nerrors[0], nerrors[1]); +} |