pthread_getschedparam.c

/*
 * sched_getschedparam.c
 *
 * Description:
 * POSIX thread functions that deal with thread scheduling.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads4w - POSIX Threads for Windows
 *      Copyright 1998 John E. Bossom
 *      Copyright 1999-2018, Pthreads4w contributors
 *
 *      Homepage: https://sourceforge.net/projects/pthreads4w/
 *
 *      The current list of contributors is contained
 *      in the file CONTRIBUTORS included with the source
 *      code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *
 *      https://sourceforge.net/p/pthreads4w/wiki/Contributors/
 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "pthread.h"
#include "implement.h"
#include "sched.h"

int
pthread_getschedparam (pthread_t thread, int *policy,
		       struct sched_param *param)
{
  int result;

  /*
   * Validate the thread id. This method works for pthreads-win32 because
   * pthread_kill and pthread_t are designed to accommodate it, but the
   * method is not portable.
   */
  result = pthread_kill (thread, 0);
  if (0 != result)
    {
      return result;
    }

  if (policy == NULL)
    {
      return EINVAL;
    }

  /* Fill out the policy. */
  *policy = SCHED_OTHER;

  /*
   * This function must return the priority value set by
   * the most recent pthread_setschedparam() or pthread_create()
   * for the target thread. It must not return the actual thread
   * priority as altered by any system priority adjustments etc.
   */
  param->sched_priority = ((__ptw32_thread_t *)thread.p)->sched_priority;

  return 0;
}