1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Daniel Eischen.
18 * 4. Neither the name of the author nor the names of any co-contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include "namespace.h"
36 #include <sys/param.h>
37 #include <errno.h>
38 #include <pthread.h>
39 #include "un-namespace.h"
40
41 #include "thr_private.h"
42
43 __weak_reference(_pthread_setschedparam, pthread_setschedparam);
44
45 /*
46 * Set a thread's scheduling parameters, this should be done
47 * in kernel, doing it in userland is no-op.
48 */
49 int
_pthread_setschedparam(pthread_t pthread,int policy,const struct sched_param * param)50 _pthread_setschedparam(pthread_t pthread, int policy,
51 const struct sched_param *param)
52 {
53 struct pthread *curthread = _get_curthread();
54 int ret;
55
56 if (pthread == curthread)
57 THR_LOCK(curthread);
58 else if ((ret = _thr_find_thread(curthread, pthread,
59 /*include dead*/0)) != 0)
60 return (ret);
61 if (pthread->attr.sched_policy == policy &&
62 (policy == SCHED_OTHER ||
63 pthread->attr.prio == param->sched_priority)) {
64 pthread->attr.prio = param->sched_priority;
65 THR_THREAD_UNLOCK(curthread, pthread);
66 return (0);
67 }
68 ret = _thr_setscheduler(pthread->tid, policy, param);
69 if (ret == -1)
70 ret = errno;
71 else {
72 pthread->attr.sched_policy = policy;
73 pthread->attr.prio = param->sched_priority;
74 }
75 THR_THREAD_UNLOCK(curthread, pthread);
76 return (ret);
77 }
78