testing/ostest/timedwait.c

/****************************************************************************
 * apps/testing/ostest/timedwait.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you 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.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <assert.h>
#include <errno.h>
#include <pthread.h>
#include <sched.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>

#include "ostest.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);
      ASSERT(false);
    }

  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");
      ASSERT(false);
    }

  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);
          ASSERT(false);
        }
    }
  else
    {
      printf("thread_waiter: ERROR "
             "pthread_cond_timedwait returned without timeout, status=%d\n",
              status);
      ASSERT(false);
    }

  /* 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);
      ASSERT(false);
    }

  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);
      ASSERT(false);
    }

  /* 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);
      ASSERT(false);
    }

  /* 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 (gettid(), &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);
      ASSERT(false);
    }
  else
    {
      printf("timedwait_test: waiter exited with result=%p\n", result);
    }
}