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Diffstat (limited to 'apps/examples/nxflat/tests/mutex/mutex.c')
| -rw-r--r-- | apps/examples/nxflat/tests/mutex/mutex.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/apps/examples/nxflat/tests/mutex/mutex.c b/apps/examples/nxflat/tests/mutex/mutex.c new file mode 100644 index 000000000..78a63306d --- /dev/null +++ b/apps/examples/nxflat/tests/mutex/mutex.c @@ -0,0 +1,149 @@ +/**************************************************************************** + * examples/nxflat/tests/mutex/mutex.c + * + * Copyright (C) 2009 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 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <pthread.h> + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +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 volatile bool bendoftest; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/* NOTE: it is necessary for functions that are referred to by function pointers + * pointer to be declared with global scope (at least for ARM). Otherwise, + * a relocation type that is not supported by NXFLAT is generated by GCC. + */ + +void thread_func(void *parameter) +{ + int my_id = (int)parameter; + int my_ndx = my_id - 1; + int i; + + /* Loop 20 times. There is a 100 MS delay in the loop so this should + * take about 2 seconds. The main thread will stop this thread after + * 2 seconds by setting bendoftest in any event. + */ + + for (i = 0; i < 20 && !bendoftest; i++); + { + if ((pthread_mutex_lock(&mut)) != 0) + { + printf("ERROR thread %d: pthread_mutex_lock failed\n", my_id); + } + + if (my_mutex == 1) + { + printf("ERROR thread=%d: " + "my_mutex should be zero, instead my_mutex=%d\n", + my_id, my_mutex); + nerrors[my_ndx]++; + } + + my_mutex = 1; + usleep(100000); + my_mutex = 0; + + if ((pthread_mutex_unlock(&mut)) != 0) + { + printf("ERROR thread %d: pthread_mutex_unlock failed\n", my_id); + } + + nloops[my_ndx]++; + } +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +int main(int argc, char **argv) +{ + pthread_t thread1; + pthread_t thread2; + + /* Initialize the mutex */ + + pthread_mutex_init(&mut, NULL); + + /* Start two thread instances */ + + printf("Starting thread 1\n"); + bendoftest = false; + if ((pthread_create(&thread1, NULL, (void*)thread_func, (void*)1)) != 0) + { + fprintf(stderr, "Error in thread#1 creation\n"); + } + + printf("Starting thread 2\n"); + if ((pthread_create(&thread2, NULL, (void*)thread_func, (void*)2)) != 0) + { + fprintf(stderr, "Error in thread#2 creation\n"); + } + + /* Wait a bit for the threads to do their thing. */ + + sleep(2); + + /* Then ask them politely to stop running */ + + printf("Stopping threads\n"); + bendoftest = true; + pthread_join(thread1, NULL); + pthread_join(thread2, NULL); + + printf("\tThread1\tThread2\n"); + printf("Loops\t%ld\t%ld\n", nloops[0], nloops[1]); + printf("Errors\t%ld\t%ld\n", nerrors[0], nerrors[1]); + + return 0; +} + |