2 * Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Daniel Eischen.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * $FreeBSD: src/lib/libpthread/thread/thr_setschedparam.c,v 1.13 2003/04/21 04:02:56 deischen Exp $
33 * $DragonFly: src/lib/libthread_xu/thread/thr_setschedparam.c,v 1.4 2006/04/05 12:12:23 davidxu Exp $
36 #include <machine/tls.h>
39 #include <sys/param.h>
41 #include "thr_private.h"
44 _pthread_setschedparam(pthread_t pthread, int policy,
45 const struct sched_param *param)
47 struct pthread *curthread = tls_get_curthread();
50 if ((param == NULL) || (policy < SCHED_FIFO) || (policy > SCHED_RR)) {
51 /* Return an invalid argument error: */
53 } else if ((param->sched_priority < THR_MIN_PRIORITY) ||
54 (param->sched_priority > THR_MAX_PRIORITY)) {
55 /* Return an unsupported value error. */
58 /* Find the thread in the list of active threads: */
59 } else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0))
62 * Lock the threads scheduling queue while we change
65 THR_THREAD_LOCK(curthread, pthread);
66 if (pthread->state == PS_DEAD) {
67 THR_THREAD_UNLOCK(curthread, pthread);
68 _thr_ref_delete(curthread, pthread);
72 /* Set the scheduling policy: */
73 pthread->attr.sched_policy = policy;
75 if (param->sched_priority ==
76 THR_BASE_PRIORITY(pthread->base_priority))
78 * There is nothing to do; unlock the threads
81 THR_THREAD_UNLOCK(curthread, pthread);
83 /* Set the thread base priority: */
84 pthread->base_priority = param->sched_priority;
86 /* Recalculate the active priority: */
87 pthread->active_priority = MAX(pthread->base_priority,
88 pthread->inherited_priority);
90 /* Unlock the threads scheduling queue: */
91 THR_THREAD_UNLOCK(curthread, pthread);
93 _thr_ref_delete(curthread, pthread);
98 __strong_reference(_pthread_setschedparam, pthread_setschedparam);