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

   1 /*
   2  * sched_setschedparam.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_setschedparam (pthread_t thread, int policy,
  43                        const 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   /* Validate the scheduling policy. */
  55   if (policy < SCHED_MIN || policy > SCHED_MAX)
  56     {
  57       return EINVAL;
  58     }
  59
  60   /* Ensure the policy is SCHED_OTHER. */
  61   if (policy != SCHED_OTHER)
  62     {
  63       return ENOTSUP;
  64     }
  65
  66   return (ptw32_setthreadpriority (thread, policy, param->sched_priority));
  67 }
  68
  69
  70 int
  71 ptw32_setthreadpriority (pthread_t thread, int policy, int priority)
  72 {
  73   int prio;
  74   ptw32_mcs_local_node_t threadLock;
  75   int result = 0;
  76   ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
  77
  78   prio = priority;
  79
  80   /* Validate priority level. */
  81   if (prio < sched_get_priority_min (policy) ||
  82       prio > sched_get_priority_max (policy))
  83     {
  84       return EINVAL;
  85     }
  86
  87 #if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
  88 /* WinCE */
  89 #else
  90 /* Everything else */
  91
  92   if (THREAD_PRIORITY_IDLE < prio && THREAD_PRIORITY_LOWEST > prio)
  93     {
  94       prio = THREAD_PRIORITY_LOWEST;
  95     }
  96   else if (THREAD_PRIORITY_TIME_CRITICAL > prio
  97            && THREAD_PRIORITY_HIGHEST < prio)
  98     {
  99       prio = THREAD_PRIORITY_HIGHEST;
 100     }
 101
 102 #endif
 103
 104   ptw32_mcs_lock_acquire (&tp->threadLock, &threadLock);
 105
 106   /* If this fails, the current priority is unchanged. */
 107   if (0 == SetThreadPriority (tp->threadH, prio))
 108     {
 109       result = EINVAL;
 110     }
 111   else
 112     {
 113       /*
 114        * Must record the thread's sched_priority as given,
 115        * not as finally adjusted.
 116        */
 117       tp->sched_priority = priority;
 118     }
 119
 120   ptw32_mcs_lock_release (&threadLock);
 121
 122   return result;
 123 }