124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
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/*
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* sched_setschedparam.c
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*
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* Description:
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* POSIX thread functions that deal with thread scheduling.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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#include "sched.h"
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int
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pthread_setschedparam (pthread_t thread, int policy,
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const struct sched_param *param)
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{
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int result;
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/* Validate the thread id. */
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result = pthread_kill (thread, 0);
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if (0 != result)
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{
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return result;
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}
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/* Validate the scheduling policy. */
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if (policy < SCHED_MIN || policy > SCHED_MAX)
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{
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return EINVAL;
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}
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/* Ensure the policy is SCHED_OTHER. */
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if (policy != SCHED_OTHER)
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{
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return ENOTSUP;
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}
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return (ptw32_setthreadpriority (thread, policy, param->sched_priority));
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}
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int
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ptw32_setthreadpriority (pthread_t thread, int policy, int priority)
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{
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int prio;
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ptw32_mcs_local_node_t threadLock;
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int result = 0;
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ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
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prio = priority;
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/* Validate priority level. */
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if (prio < sched_get_priority_min (policy) ||
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prio > sched_get_priority_max (policy))
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{
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return EINVAL;
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}
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#if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
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/* WinCE */
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#else
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/* Everything else */
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if (THREAD_PRIORITY_IDLE < prio && THREAD_PRIORITY_LOWEST > prio)
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{
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prio = THREAD_PRIORITY_LOWEST;
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}
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else if (THREAD_PRIORITY_TIME_CRITICAL > prio
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&& THREAD_PRIORITY_HIGHEST < prio)
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{
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prio = THREAD_PRIORITY_HIGHEST;
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}
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#endif
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ptw32_mcs_lock_acquire (&tp->threadLock, &threadLock);
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/* If this fails, the current priority is unchanged. */
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if (0 == SetThreadPriority (tp->threadH, prio))
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{
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result = EINVAL;
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}
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else
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{
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/*
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* Must record the thread's sched_priority as given,
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* not as finally adjusted.
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*/
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tp->sched_priority = priority;
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}
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ptw32_mcs_lock_release (&threadLock);
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return result;
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}
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