mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-11-28 13:22:48 +00:00
120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Daniel Eischen.
|
|
* 4. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <errno.h>
|
|
#include <sys/param.h>
|
|
#include <pthread.h>
|
|
#include "pthread_private.h"
|
|
|
|
__weak_reference(_pthread_setschedparam, pthread_setschedparam);
|
|
|
|
int
|
|
_pthread_setschedparam(pthread_t pthread, int policy,
|
|
const struct sched_param *param)
|
|
{
|
|
int old_prio, in_readyq = 0, ret = 0;
|
|
|
|
if ((param == NULL) || (policy < SCHED_FIFO) || (policy > SCHED_RR)) {
|
|
/* Return an invalid argument error: */
|
|
ret = EINVAL;
|
|
} else if ((param->sched_priority < PTHREAD_MIN_PRIORITY) ||
|
|
(param->sched_priority > PTHREAD_MAX_PRIORITY)) {
|
|
/* Return an unsupported value error. */
|
|
ret = ENOTSUP;
|
|
|
|
/* Find the thread in the list of active threads: */
|
|
} else if ((ret = _find_thread(pthread)) == 0) {
|
|
/*
|
|
* Defer signals to protect the scheduling queues from
|
|
* access by the signal handler:
|
|
*/
|
|
_thread_kern_sig_defer();
|
|
|
|
if (param->sched_priority !=
|
|
PTHREAD_BASE_PRIORITY(pthread->base_priority)) {
|
|
/*
|
|
* Remove the thread from its current priority
|
|
* queue before any adjustments are made to its
|
|
* active priority:
|
|
*/
|
|
old_prio = pthread->active_priority;
|
|
if ((pthread->flags & PTHREAD_FLAGS_IN_PRIOQ) != 0) {
|
|
in_readyq = 1;
|
|
PTHREAD_PRIOQ_REMOVE(pthread);
|
|
}
|
|
|
|
/* Set the thread base priority: */
|
|
pthread->base_priority &=
|
|
(PTHREAD_SIGNAL_PRIORITY | PTHREAD_RT_PRIORITY);
|
|
pthread->base_priority = param->sched_priority;
|
|
|
|
/* Recalculate the active priority: */
|
|
pthread->active_priority = MAX(pthread->base_priority,
|
|
pthread->inherited_priority);
|
|
|
|
if (in_readyq) {
|
|
if ((pthread->priority_mutex_count > 0) &&
|
|
(old_prio > pthread->active_priority)) {
|
|
/*
|
|
* POSIX states that if the priority is
|
|
* being lowered, the thread must be
|
|
* inserted at the head of the queue for
|
|
* its priority if it owns any priority
|
|
* protection or inheritence mutexes.
|
|
*/
|
|
PTHREAD_PRIOQ_INSERT_HEAD(pthread);
|
|
}
|
|
else
|
|
PTHREAD_PRIOQ_INSERT_TAIL(pthread);
|
|
}
|
|
|
|
/*
|
|
* Check for any mutex priority adjustments. This
|
|
* includes checking for a priority mutex on which
|
|
* this thread is waiting.
|
|
*/
|
|
_mutex_notify_priochange(pthread);
|
|
}
|
|
|
|
/* Set the scheduling policy: */
|
|
pthread->attr.sched_policy = policy;
|
|
|
|
/*
|
|
* Undefer and handle pending signals, yielding if
|
|
* necessary:
|
|
*/
|
|
_thread_kern_sig_undefer();
|
|
}
|
|
return(ret);
|
|
}
|