text: /***********************************************************************
   * apps/examples/ostest/semtimed.c
   *
   *   Copyright (C) 2014 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 <stdio.h>
  #include <pthread.h>
  #include <semaphore.h>
  #include <time.h>
  #include <sched.h>
  #include <errno.h>
  
  #include "ostest.h"
  
  /***********************************************************************
   * Preprocessor Definitions
   ***********************************************************************/
  
  #ifndef NULL
  # define NULL (void*)0
  #endif
  
  /***********************************************************************
   * Private Data
   ***********************************************************************/
  
  static sem_t sem;
  
  /***********************************************************************
   * Private Functions
   ***********************************************************************/
  
  static void *poster_func(void *parameter)
  {
    /* Wait for one second, then post the semaphore */
  
    printf("poster_func: Waiting for 1 second\n");
    sleep(1);
    printf("poster_func: Posting\n");
    sem_post(&sem);
    return NULL;
  }
  
  /***********************************************************************
   * Public Functions
   ***********************************************************************/
  
  void semtimed_test(void)
  {
    pthread_t poster_thread = (pthread_t)0;
  #ifdef SDCC
    pthread_addr_t result;
  #endif
    struct sched_param sparam;
    struct timespec abstime;
    struct timespec before;
    struct timespec after;
    int prio_min;
    int prio_max;
    int prio_mid;
    pthread_attr_t attr;
    int status;
  
    printf("semtimed_test: Initializing semaphore to 0\n");
    sem_init(&sem, 0, 0);
  
    /* First, make sure that the timeout expires if the semaphore is never posted */
  
    (void)clock_gettime(CLOCK_REALTIME, &before);
  
    abstime.tv_sec  = before.tv_sec + 2;
    abstime.tv_nsec = before.tv_nsec;
  
    printf("semtimed_test: Waiting for two second timeout\n");
    status = sem_timedwait(&sem, &abstime);
    (void)clock_gettime(CLOCK_REALTIME, &after);
  
    if (status == OK)
      {
        printf("semtimed_test: ERROR: sem_timedwait succeeded\n");
      }
    else
      {
        int errcode = errno;
        if (errcode == ETIMEDOUT)
          {
            printf("samwait_test:  PASS\n");
          }
        else
          {
            printf("semtimed_test: ERROR: sem_timedwait failed with: %d\n", errcode);
          }
      }
  
    (void)clock_gettime(CLOCK_REALTIME, &after);
    printf("BEFORE: (%lu sec, %lu nsec)\n",
            (unsigned long)before.tv_sec, (unsigned long)before.tv_nsec);
    printf("AFTER:  (%lu sec, %lu nsec)\n",
            (unsigned long)after.tv_sec, (unsigned long)after.tv_nsec);
  
    /* Now make sure that the time wait returns successfully if the semaphore is posted */
    /* Start a poster thread.  It will wait 1 seconds and post the semaphore */
  
    printf("semtimed_test: Starting poster thread\n");
    status = pthread_attr_init(&attr);
    if (status != OK)
      {
        printf("semtimed_test: ERROR: 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("semtimed_test: ERROR: pthread_attr_setschedparam failed, status=%d\n",  status);
      }
    else
      {
        printf("semtimed_test: Set thread 1 priority to %d\n",  sparam.sched_priority);
      }
  
  
    printf("semtimed_test: Starting poster thread 3\n");
    status = pthread_attr_init(&attr);
    if (status != 0)
      {
        printf("semtimed_test: ERROR: 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("semtimed_test: pthread_attr_setschedparam failed, status=%d\n",  status);
      }
    else
      {
        printf("semtimed_test: Set thread 3 priority to %d\n",  sparam.sched_priority);
      }
  
    status = pthread_create(&poster_thread, &attr, poster_func, NULL);
    if (status != 0)
      {
        printf("semtimed_test: ERROR: Poster thread creation failed: %d\n",  status);
        sem_destroy(&sem);
        return;
      }
  
    /* Up to two seconds for the semaphore to be posted */
  
    (void)clock_gettime(CLOCK_REALTIME, &before);
  
    abstime.tv_sec  = before.tv_sec + 2;
    abstime.tv_nsec = before.tv_nsec;
  
    printf("semtimed_test: Waiting for two second timeout\n");
    status = sem_timedwait(&sem, &abstime);
    (void)clock_gettime(CLOCK_REALTIME, &after);
  
    if (status < 0)
      {
        int errcode = errno;
        printf("semtimed_test: ERROR: sem_timedwait failed with: %d\n", errcode);
      }
    else
      {
        printf("semtimed_test: PASS: sem_timedwait succeeded\n");
      }
  
    (void)clock_gettime(CLOCK_REALTIME, &after);
    printf("BEFORE: (%lu sec, %lu nsec)\n",
            (unsigned long)before.tv_sec, (unsigned long)before.tv_nsec);
    printf("AFTER:  (%lu sec, %lu nsec)\n",
            (unsigned long)after.tv_sec, (unsigned long)after.tv_nsec);
  
  
    /* Clean up detritus left by the pthread */
  
  #ifdef SDCC
    if (poster_thread != (pthread_t)0)
      {
        pthread_join(poster_thread, &result);
      }
  #else
    if (poster_thread != (pthread_t)0)
      {
        pthread_join(poster_thread, NULL);
      }
  #endif
    sem_destroy(&sem);
  }
  