From eafaeb9398216dacb92de69683ccdda6007efb1d Mon Sep 17 00:00:00 2001 From: patacongo Date: Sun, 20 Mar 2011 18:18:19 +0000 Subject: Move nuttx/examples to apps/examples git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3405 42af7a65-404d-4744-a932-0658087f49c3 --- apps/examples/ostest/sem.c | 246 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 246 insertions(+) create mode 100644 apps/examples/ostest/sem.c (limited to 'apps/examples/ostest/sem.c') diff --git a/apps/examples/ostest/sem.c b/apps/examples/ostest/sem.c new file mode 100644 index 000000000..850cf8040 --- /dev/null +++ b/apps/examples/ostest/sem.c @@ -0,0 +1,246 @@ +/*********************************************************************** + * sem.c + * + * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * 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 +#include +#include +#include +#include "ostest.h" + +#ifndef NULL +# define NULL (void*)0 +#endif + +static sem_t sem; + +static void *waiter_func(void *parameter) +{ + int id = (int)parameter; + int status; + int value; + + printf("waiter_func: Thread %d Started\n", id); + + /* Take the semaphore */ + + status = sem_getvalue(&sem, &value); + if (status < 0) + { + printf("waiter_func: ERROR thread %d could not get semaphore value\n", id); + } + else + { + printf("waiter_func: Thread %d initial semaphore value = %d\n", id, value); + } + + printf("waiter_func: Thread %d waiting on semaphore\n", id); + status = sem_wait(&sem); + if (status != 0) + { + printf("waiter_func: ERROR thread %d sem_wait failed\n", id); + } + printf("waiter_func: Thread %d awakened\n", id); + + status = sem_getvalue(&sem, &value); + if (status < 0) + { + printf("waiter_func: ERROR thread %d could not get semaphore value\n", id); + } + else + { + printf("waiter_func: Thread %d new semaphore value = %d\n", id, value); + } + + printf("waiter_func: Thread %d done\n", id); + return NULL; +} + +static void *poster_func(void *parameter) +{ + int id = (int)parameter; + int status; + int value; + + printf("poster_func: Thread %d started\n", id); + + /* Take the semaphore */ + + do + { + status = sem_getvalue(&sem, &value); + if (status < 0) + { + printf("poster_func: ERROR thread %d could not get semaphore value\n", id); + } + else + { + printf("poster_func: Thread %d semaphore value = %d\n", id, value); + } + + if (value < 0) + { + printf("poster_func: Thread %d posting semaphore\n", id); + status = sem_post(&sem); + if (status != 0) + { + printf("poster_func: ERROR thread %d sem_wait failed\n", id); + } + + pthread_yield(); + + status = sem_getvalue(&sem, &value); + if (status < 0) + { + printf("poster_func: ERROR thread %d could not get semaphore value\n", id); + } + else + { + printf("poster_func: Thread %d new semaphore value = %d\n", id, value); + } + } + } + while (value < 0); + + printf("poster_func: Thread %d done\n", id); + return NULL; + +} + +void sem_test(void) +{ + pthread_t waiter_thread1; + pthread_t waiter_thread2; + pthread_t poster_thread; +#ifdef SDCC + pthread_addr_t result; +#endif + struct sched_param sparam; + int prio_min; + int prio_max; + int prio_mid; + pthread_attr_t attr; + int status; + + printf("sem_test: Initializing semaphore to 0\n"); + sem_init(&sem, 0, 0); + + /* Start two waiter thread instances */ + + printf("sem_test: Starting waiter thread 1\n"); + status = pthread_attr_init(&attr); + if (status != OK) + { + printf("sem_test: pthread_attr_init failed, status=%d\n", status); + } + + prio_min = sched_get_priority_min(SCHED_FIFO); + prio_max = sched_get_priority_max(SCHED_FIFO); + prio_mid = (prio_min + prio_max) / 2; + + sparam.sched_priority = (prio_mid + prio_max) / 2; + status = pthread_attr_setschedparam(&attr,&sparam); + if (status != OK) + { + printf("sem_test: pthread_attr_setschedparam failed, status=%d\n", status); + } + else + { + printf("sem_test: Set thread 1 priority to %d\n", sparam.sched_priority); + } + + status = pthread_create(&waiter_thread1, &attr, waiter_func, (pthread_addr_t)1); + if (status != 0) + { + printf("sem_test: Error in thread 1 creation, status=%d\n", status); + } + + printf("sem_test: Starting waiter thread 2\n"); + status = pthread_attr_init(&attr); + if (status != 0) + { + printf("sem_test: pthread_attr_init failed, status=%d\n", status); + } + + sparam.sched_priority = prio_mid; + status = pthread_attr_setschedparam(&attr,&sparam); + if (status != OK) + { + printf("sem_test: pthread_attr_setschedparam failed, status=%d\n", status); + } + else + { + printf("sem_test: Set thread 2 priority to %d\n", sparam.sched_priority); + } + + status = pthread_create(&waiter_thread2, &attr, waiter_func, (pthread_addr_t)2); + if (status != 0) + { + printf("sem_test: Error in thread 2 creation, status=%d\n", status); + } + + printf("sem_test: Starting poster thread 3\n"); + status = pthread_attr_init(&attr); + if (status != 0) + { + printf("sem_test: pthread_attr_init failed, status=%d\n", status); + } + + sparam.sched_priority = (prio_min + prio_mid) / 2; + status = pthread_attr_setschedparam(&attr,&sparam); + if (status != OK) + { + printf("sem_test: pthread_attr_setschedparam failed, status=%d\n", status); + } + else + { + printf("sem_test: Set thread 3 priority to %d\n", sparam.sched_priority); + } + + status = pthread_create(&poster_thread, &attr, poster_func, (pthread_addr_t)3); + if (status != 0) + { + printf("sem_test: Error in thread 3 creation, status=%d\n", status); + } + +#ifdef SDCC + pthread_join(waiter_thread1, &result); + pthread_join(waiter_thread2, &result); + pthread_join(poster_thread, &result); +#else + pthread_join(waiter_thread1, NULL); + pthread_join(waiter_thread2, NULL); + pthread_join(poster_thread, NULL); +#endif +} -- cgit v1.2.3