245116cafc
and sched_get_priority_max() syscalls. - Remove unused fields from structure pthread_attr.
96 lines
3.3 KiB
C
96 lines
3.3 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 "namespace.h"
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#include <sys/param.h>
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#include <errno.h>
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#include <pthread.h>
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#include "un-namespace.h"
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#include "thr_private.h"
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__weak_reference(_pthread_setschedparam, pthread_setschedparam);
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/*
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* Set a thread's scheduling parameters, this should be done
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* in kernel, doing it in userland is no-op.
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*/
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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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struct pthread *curthread = _get_curthread();
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int ret = 0;
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if ((param == NULL) || (policy < SCHED_FIFO) || (policy > SCHED_RR)) {
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ret = EINVAL;
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} else if (param->sched_priority < _thr_priorities[policy-1].pri_min ||
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param->sched_priority > _thr_priorities[policy-1].pri_max) {
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ret = ENOTSUP;
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} else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0))
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== 0) {
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/*
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* Lock the threads scheduling queue while we change
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* its priority:
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*/
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THR_THREAD_LOCK(curthread, pthread);
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if (pthread->state == PS_DEAD) {
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THR_THREAD_UNLOCK(curthread, pthread);
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_thr_ref_delete(curthread, pthread);
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return (ESRCH);
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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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if (param->sched_priority == pthread->base_priority)
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/*
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* There is nothing to do; unlock the threads
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* scheduling queue.
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*/
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THR_THREAD_UNLOCK(curthread, pthread);
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else {
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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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THR_THREAD_UNLOCK(curthread, pthread);
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}
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_thr_ref_delete(curthread, pthread);
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}
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return (ret);
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}
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