native_client_sdk/src/libraries/third_party/pthreads-win32/pthread_getschedparam.c

   1 /*
   2  * sched_getschedparam.c
   3  *
   4  * Description:
   5  * POSIX thread functions that deal with thread scheduling.
   6  *
   7  * --------------------------------------------------------------------------
   8  *
   9  *      Pthreads-win32 - POSIX Threads Library for Win32
  10  *      Copyright(C) 1998 John E. Bossom
  11  *      Copyright(C) 1999,2005 Pthreads-win32 contributors
  12  *
  13  *      Contact Email: rpj@callisto.canberra.edu.au
  14  *
  15  *      The current list of contributors is contained
  16  *      in the file CONTRIBUTORS included with the source
  17  *      code distribution. The list can also be seen at the
  18  *      following World Wide Web location:
  19  *      http://sources.redhat.com/pthreads-win32/contributors.html
  20  *
  21  *      This library is free software; you can redistribute it and/or
  22  *      modify it under the terms of the GNU Lesser General Public
  23  *      License as published by the Free Software Foundation; either
  24  *      version 2 of the License, or (at your option) any later version.
  25  *
  26  *      This library is distributed in the hope that it will be useful,
  27  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  29  *      Lesser General Public License for more details.
  30  *
  31  *      You should have received a copy of the GNU Lesser General Public
  32  *      License along with this library in the file COPYING.LIB;
  33  *      if not, write to the Free Software Foundation, Inc.,
  34  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  35  */
  36
  37 #include "pthread.h"
  38 #include "implement.h"
  39 #include "sched.h"
  40
  41 int
  42 pthread_getschedparam (pthread_t thread, int *policy,
  43                        struct sched_param *param)
  44 {
  45   int result;
  46
  47   /* Validate the thread id. */
  48   result = pthread_kill (thread, 0);
  49   if (0 != result)
  50     {
  51       return result;
  52     }
  53
  54   /*
  55    * Validate the policy and param args.
  56    * Check that a policy constant wasn't passed rather than &policy.
  57    */
  58   if (policy <= (int *) SCHED_MAX || param == NULL)
  59     {
  60       return EINVAL;
  61     }
  62
  63   /* Fill out the policy. */
  64   *policy = SCHED_OTHER;
  65
  66   /*
  67    * This function must return the priority value set by
  68    * the most recent pthread_setschedparam() or pthread_create()
  69    * for the target thread. It must not return the actual thread
  70    * priority as altered by any system priority adjustments etc.
  71    */
  72   param->sched_priority = ((ptw32_thread_t *)thread.p)->sched_priority;
  73
  74   return 0;
  75 }