thr_affinity.c revision 176763 
1/*
2 * Copyright (c) 2008, David Xu <davidxu@freebsd.org>
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 unmodified, this list of conditions, and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: head/lib/libthr/thread/thr_affinity.c 176763 2008-03-03 09:16:29Z davidxu $
27 *
28 */
29
30#include "namespace.h"
31#include <pthread.h>
32#include <sys/param.h>
33#include <sys/cpuset.h>
34#include "un-namespace.h"
35
36#include "thr_private.h"
37
38__weak_reference(_pthread_getaffinity_np, pthread_getaffinity_np);
39__weak_reference(_pthread_setaffinity_np, pthread_setaffinity_np);
40
41int
42_pthread_setaffinity_np(pthread_t td, size_t cpusetsize, const cpuset_t *cpuset)
43{
44	struct pthread	*curthread = _get_curthread();
45	lwpid_t		tid;
46	int		error;
47
48	THR_THREAD_LOCK(curthread, td);
49	if (td->state == PS_DEAD) {
50		THR_THREAD_UNLOCK(curthread, td);
51		return (EINVAL);
52	}
53	tid = TID(td);
54	error = cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, tid,
55	    cpusetsize, cpuset);
56	if (error == -1)
57		error = errno;
58	THR_THREAD_UNLOCK(curthread, td);
59	return (error);
60}
61
62int
63_pthread_getaffinity_np(pthread_t td, size_t cpusetsize, cpuset_t *cpuset)
64{
65	lwpid_t tid;
66	int error;
67
68	tid = TID(td);
69	error = cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, tid,
70	    cpusetsize, cpuset);
71	if (error == -1)
72		error = errno;
73	return (error);
74}
75