120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
/*
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* Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Daniel Eischen.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <errno.h>
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#include <sys/param.h>
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#include <pthread.h>
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#include "pthread_private.h"
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__weak_reference(_pthread_setschedparam, pthread_setschedparam);
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int
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_pthread_setschedparam(pthread_t pthread, int policy,
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const struct sched_param *param)
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{
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int old_prio, in_readyq = 0, ret = 0;
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if ((param == NULL) || (policy < SCHED_FIFO) || (policy > SCHED_RR)) {
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/* Return an invalid argument error: */
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ret = EINVAL;
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} else if ((param->sched_priority < PTHREAD_MIN_PRIORITY) ||
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(param->sched_priority > PTHREAD_MAX_PRIORITY)) {
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/* Return an unsupported value error. */
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ret = ENOTSUP;
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/* Find the thread in the list of active threads: */
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} else if ((ret = _find_thread(pthread)) == 0) {
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/*
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* Defer signals to protect the scheduling queues from
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* access by the signal handler:
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*/
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_thread_kern_sig_defer();
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if (param->sched_priority !=
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PTHREAD_BASE_PRIORITY(pthread->base_priority)) {
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/*
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* Remove the thread from its current priority
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* queue before any adjustments are made to its
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* active priority:
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*/
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old_prio = pthread->active_priority;
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if ((pthread->flags & PTHREAD_FLAGS_IN_PRIOQ) != 0) {
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in_readyq = 1;
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PTHREAD_PRIOQ_REMOVE(pthread);
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}
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/* Set the thread base priority: */
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pthread->base_priority &=
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(PTHREAD_SIGNAL_PRIORITY | PTHREAD_RT_PRIORITY);
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pthread->base_priority = param->sched_priority;
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/* Recalculate the active priority: */
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pthread->active_priority = MAX(pthread->base_priority,
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pthread->inherited_priority);
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if (in_readyq) {
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if ((pthread->priority_mutex_count > 0) &&
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(old_prio > pthread->active_priority)) {
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/*
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* POSIX states that if the priority is
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* being lowered, the thread must be
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* inserted at the head of the queue for
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* its priority if it owns any priority
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* protection or inheritence mutexes.
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*/
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PTHREAD_PRIOQ_INSERT_HEAD(pthread);
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}
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else
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PTHREAD_PRIOQ_INSERT_TAIL(pthread);
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}
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/*
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* Check for any mutex priority adjustments. This
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* includes checking for a priority mutex on which
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* this thread is waiting.
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*/
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_mutex_notify_priochange(pthread);
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}
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/* Set the scheduling policy: */
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pthread->attr.sched_policy = policy;
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/*
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* Undefer and handle pending signals, yielding if
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* necessary:
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*/
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_thread_kern_sig_undefer();
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}
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return(ret);
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}
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