text: /****************************************************************************
   *
   * Copyright 2016 Samsung Electronics All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied. See the License for the specific
   * language governing permissions and limitations under the License.
   *
   ****************************************************************************/
  /***********************************************************************
   * examples/kernel_sample/timedwait.c
   *
   *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * 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 <sys/types.h>
  #include <stdio.h>
  #include <time.h>
  #include <pthread.h>
  #include <unistd.h>
  #include <errno.h>
  
  #include "kernel_sample.h"
  
  /**************************************************************************
   * Private Definitions
   **************************************************************************/
  
  /**************************************************************************
   * Private Data
   **************************************************************************/
  
  static pthread_mutex_t mutex;
  static pthread_cond_t  cond;
  
  /**************************************************************************
   * Private Functions
   **************************************************************************/
  
  static void *thread_waiter(void *parameter)
  {
  	struct timespec ts;
  	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, &ts);
  	if (status != 0) {
  		printf("thread_waiter: ERROR clock_gettime failed\n");
  	}
  	ts.tv_sec += 5;
  
  	/* The wait -- no-one is ever going to awaken us */
  
  	status = pthread_cond_timedwait(&cond, &mutex, &ts);
  	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);
  	}
  }
  