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Diffstat (limited to 'apps/examples/ostest/timedwait.c')
| -rw-r--r-- | apps/examples/ostest/timedwait.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/apps/examples/ostest/timedwait.c b/apps/examples/ostest/timedwait.c new file mode 100644 index 000000000..51622bad8 --- /dev/null +++ b/apps/examples/ostest/timedwait.c @@ -0,0 +1,201 @@ +/*********************************************************************** + * examples/ostest/timedwait.c + * + * Copyright (C) 2007, 2008 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 <stdio.h> +#include <time.h> +#include <pthread.h> +#include <unistd.h> +#include <errno.h> + +#include "ostest.h" + +/************************************************************************** + * Private Definitions + **************************************************************************/ + +#if CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0 +# define FFLUSH() fflush(stdout) +#else +# define FFLUSH() +#endif + +/************************************************************************** + * Private Data + **************************************************************************/ + +static pthread_mutex_t mutex; +static pthread_cond_t cond; + +/************************************************************************** + * Private Functions + **************************************************************************/ + +static void *thread_waiter(void *parameter) +{ + struct timespec time; + int status; + + /* Take the mutex */ + + printf("thread_waiter: Taking mutex\n"); + status = pthread_mutex_lock(&mutex); + if (status != 0) + { + printf("thread_waiter: ERROR pthread_mutex_lock failed, status=%d\n", status); + } + + printf("thread_waiter: Starting 5 second wait for condition\n"); + + status = clock_gettime(CLOCK_REALTIME, &time); + if (status != 0) + { + printf("thread_waiter: ERROR clock_gettime failed\n"); + } + time.tv_sec += 5; + + /* The wait -- no-one is ever going to awaken us */ + + status = pthread_cond_timedwait(&cond, &mutex, &time); + if (status != 0) + { + if (status == ETIMEDOUT) + { + printf("thread_waiter: pthread_cond_timedwait timed out\n"); + } + else + { + printf("thread_waiter: ERROR pthread_cond_timedwait failed, status=%d\n", status); + } + } + else + { + printf("thread_waiter: ERROR pthread_cond_timedwait returned without timeout, status=%d\n", status); + } + + /* Release the mutex */ + + printf("thread_waiter: Releasing mutex\n"); + status = pthread_mutex_unlock(&mutex); + if (status != 0) + { + printf("thread_waiter: ERROR pthread_mutex_unlock failed, status=%d\n", status); + } + + printf("thread_waiter: Exit with status 0x12345678\n"); + pthread_exit((pthread_addr_t)0x12345678); + return NULL; +} + +/************************************************************************** + * Public Definitions + **************************************************************************/ + +void timedwait_test(void) +{ + pthread_t waiter; + pthread_attr_t attr; + struct sched_param sparam; + void *result; + int prio_max; + int status; + + /* Initialize the mutex */ + + printf("thread_waiter: Initializing mutex\n"); + status = pthread_mutex_init(&mutex, NULL); + if (status != 0) + { + printf("timedwait_test: ERROR pthread_mutex_init failed, status=%d\n", status); + } + + /* Initialize the condition variable */ + + printf("timedwait_test: Initializing cond\n"); + status = pthread_cond_init(&cond, NULL); + if (status != 0) + { + printf("timedwait_test: ERROR pthread_condinit failed, status=%d\n", status); + } + + /* Start the waiter thread at higher priority */ + + printf("timedwait_test: Starting waiter\n"); + status = pthread_attr_init(&attr); + if (status != 0) + { + printf("timedwait_test: pthread_attr_init failed, status=%d\n", status); + } + + prio_max = sched_get_priority_max(SCHED_FIFO); + status = sched_getparam (getpid(), &sparam); + if (status != 0) + { + printf("timedwait_test: sched_getparam failed\n"); + sparam.sched_priority = PTHREAD_DEFAULT_PRIORITY; + } + + sparam.sched_priority = (prio_max + sparam.sched_priority) / 2; + status = pthread_attr_setschedparam(&attr,&sparam); + if (status != OK) + { + printf("timedwait_test: pthread_attr_setschedparam failed, status=%d\n", status); + } + else + { + printf("timedwait_test: Set thread 2 priority to %d\n", sparam.sched_priority); + } + + status = pthread_create(&waiter, &attr, thread_waiter, NULL); + if (status != 0) + { + printf("timedwait_test: pthread_create failed, status=%d\n", status); + } + + printf("timedwait_test: Joining\n"); + FFLUSH(); + status = pthread_join(waiter, &result); + if (status != 0) + { + printf("timedwait_test: ERROR pthread_join failed, status=%d\n", status); + } + else + { + printf("timedwait_test: waiter exited with result=%p\n", result); + } +} |