thr_getschedparam.c revision 160321 
1/*
2 * Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
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. 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.
19 *
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
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: head/lib/libthr/thread/thr_getschedparam.c 160321 2006-07-13 06:35:43Z davidxu $
33 */
34
35#include "namespace.h"
36#include <errno.h>
37#include <pthread.h>
38#include "un-namespace.h"
39
40#include "thr_private.h"
41
42__weak_reference(_pthread_getschedparam, pthread_getschedparam);
43
44int
45_pthread_getschedparam(pthread_t pthread, int *policy,
46	struct sched_param *param)
47{
48	struct pthread *curthread = _get_curthread();
49	int ret;
50
51	if (policy == NULL || param == NULL)
52		return (EINVAL);
53
54	if (pthread == curthread) {
55		/*
56		 * Avoid searching the thread list when it is the current
57		 * thread.
58		 */
59		THR_LOCK(curthread);
60		ret = thr_getscheduler((pid_t)curthread->tid, policy, param,
61			sizeof(param));
62		if (ret == -1)
63			ret = errno;
64		THR_UNLOCK(curthread);
65	}
66	/* Find the thread in the list of active threads. */
67	else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0))
68	    == 0) {
69		THR_THREAD_LOCK(curthread, pthread);
70		ret = thr_getscheduler(pthread->tid, policy, param,
71			sizeof(param));
72		if (ret == -1)
73			ret = errno;
74		THR_THREAD_UNLOCK(curthread, pthread);
75		_thr_ref_delete(curthread, pthread);
76	}
77	return (ret);
78}
79