text: /*
   * sched_setschedparam.c
   * 
   * Description:
   * POSIX thread functions that deal with thread scheduling.
   *
   * --------------------------------------------------------------------------
   *
   *      Pthreads-win32 - POSIX Threads Library for Win32
   *      Copyright(C) 1998 John E. Bossom
   *      Copyright(C) 1999,2005 Pthreads-win32 contributors
   * 
   *      Contact Email: rpj@callisto.canberra.edu.au
   * 
   *      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:
   *      http://sources.redhat.com/pthreads-win32/contributors.html
   * 
   *      This library is free software; you can redistribute it and/or
   *      modify it under the terms of the GNU Lesser General Public
   *      License as published by the Free Software Foundation; either
   *      version 2 of the License, or (at your option) any later version.
   * 
   *      This library is distributed in the hope that it will be useful,
   *      but WITHOUT ANY WARRANTY; without even the implied warranty of
   *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   *      Lesser General Public License for more details.
   * 
   *      You should have received a copy of the GNU Lesser General Public
   *      License along with this library in the file COPYING.LIB;
   *      if not, write to the Free Software Foundation, Inc.,
   *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
   */
  
  #include "pthread.h"
  #include "implement.h"
  #include "sched.h"
  
  int
  pthread_setschedparam (pthread_t thread, int policy,
  		       const struct sched_param *param)
  {
    int result;
  
    /* Validate the thread id. */
    result = pthread_kill (thread, 0);
    if (0 != result)
      {
        return result;
      }
  
    /* Validate the scheduling policy. */
    if (policy < SCHED_MIN || policy > SCHED_MAX)
      {
        return EINVAL;
      }
  
    /* Ensure the policy is SCHED_OTHER. */
    if (policy != SCHED_OTHER)
      {
        return ENOTSUP;
      }
  
    return (ptw32_setthreadpriority (thread, policy, param->sched_priority));
  }
  
  
  int
  ptw32_setthreadpriority (pthread_t thread, int policy, int priority)
  {
    int prio;
    ptw32_mcs_local_node_t threadLock;
    int result = 0;
    ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
  
    prio = priority;
  
    /* Validate priority level. */
    if (prio < sched_get_priority_min (policy) ||
        prio > sched_get_priority_max (policy))
      {
        return EINVAL;
      }
  
  #if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
  /* WinCE */
  #else
  /* Everything else */
  
    if (THREAD_PRIORITY_IDLE < prio && THREAD_PRIORITY_LOWEST > prio)
      {
        prio = THREAD_PRIORITY_LOWEST;
      }
    else if (THREAD_PRIORITY_TIME_CRITICAL > prio
  	   && THREAD_PRIORITY_HIGHEST < prio)
      {
        prio = THREAD_PRIORITY_HIGHEST;
      }
  
  #endif
  
    ptw32_mcs_lock_acquire (&tp->threadLock, &threadLock);
  
    /* If this fails, the current priority is unchanged. */
    if (0 == SetThreadPriority (tp->threadH, prio))
      {
        result = EINVAL;
      }
    else
      {
        /*
         * Must record the thread's sched_priority as given,
         * not as finally adjusted.
         */
        tp->sched_priority = priority;
      }
  
    ptw32_mcs_lock_release (&threadLock);
  
    return result;
  }
  