freebsd-dev/lib/libthr/thread/thr_setprio.c

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
* 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. 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 JOHN BIRRELL 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.
*/
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include "namespace.h"
#include <pthread.h>
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#include "un-namespace.h"
#include "thr_private.h"
__weak_reference(_pthread_setprio, pthread_setprio);
int
_pthread_setprio(pthread_t pthread, int prio)
{
struct pthread *curthread = _get_curthread();
struct sched_param param;
int ret;
param.sched_priority = prio;
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if (pthread == curthread)
THR_LOCK(curthread);
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else if ((ret = _thr_find_thread(curthread, pthread, /*include dead*/0)))
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return (ret);
if (pthread->attr.sched_policy == SCHED_OTHER ||
pthread->attr.prio == prio) {
pthread->attr.prio = prio;
ret = 0;
} else {
ret = _thr_setscheduler(pthread->tid,
pthread->attr.sched_policy, &param);
if (ret == -1)
ret = errno;
else
pthread->attr.prio = prio;
}
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THR_THREAD_UNLOCK(curthread, pthread);
return (ret);
}