thr_setprio.c revision 165967 
1/*
2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: head/lib/libthr/thread/thr_setprio.c 165967 2007-01-12 07:26:21Z imp $
30 */
31
32#include "namespace.h"
33#include <pthread.h>
34#include "un-namespace.h"
35
36#include "thr_private.h"
37
38__weak_reference(_pthread_setprio, pthread_setprio);
39
40int
41_pthread_setprio(pthread_t pthread, int prio)
42{
43	struct pthread	*curthread = _get_curthread();
44	struct sched_param	param;
45	int	ret;
46
47	param.sched_priority = prio;
48	if (pthread == curthread) {
49		THR_LOCK(curthread);
50		if (curthread->attr.sched_policy == SCHED_OTHER ||
51		    curthread->attr.prio == prio) {
52			curthread->attr.prio = prio;
53			ret = 0;
54		} else {
55			ret = _thr_setscheduler(curthread->tid,
56			    curthread->attr.sched_policy, &param);
57			if (ret == -1)
58				ret = errno;
59			else
60				curthread->attr.prio = prio;
61		}
62		THR_UNLOCK(curthread);
63	} else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0))
64		== 0) {
65		THR_THREAD_LOCK(curthread, pthread);
66		if (pthread->attr.sched_policy == SCHED_OTHER ||
67		    pthread->attr.prio == prio) {
68			pthread->attr.prio = prio;
69			ret = 0;
70		} else {
71			ret = _thr_setscheduler(pthread->tid,
72				curthread->attr.sched_policy, &param);
73			if (ret == -1)
74				ret = errno;
75			else
76				pthread->attr.prio = prio;
77		}
78		THR_THREAD_UNLOCK(curthread, pthread);
79		_thr_ref_delete(curthread, pthread);
80	}
81	return (ret);
82}
83