thr_affinity.c revision 177861 
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 177861 2008-04-02 11:41:12Z davidxu $
27 *
28 */
29
30#include "namespace.h"
31#include <pthread_np.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	if (td == curthread) {
49		error = cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID,
50			-1, cpusetsize, cpuset);
51		if (error == -1)
52			error = errno;
53	} else {
54		THR_THREAD_LOCK(curthread, td);
55		if (td->state == PS_DEAD) {
56			THR_THREAD_UNLOCK(curthread, td);
57			return (EINVAL);
58		}
59		tid = TID(td);
60		error = cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID, tid,
61			cpusetsize, cpuset);
62		if (error == -1)
63			error = errno;
64		THR_THREAD_UNLOCK(curthread, td);
65	}
66	return (error);
67}
68
69int
70_pthread_getaffinity_np(pthread_t td, size_t cpusetsize, cpuset_t *cpuset)
71{
72	struct pthread	*curthread = _get_curthread();
73	lwpid_t tid;
74	int error;
75
76	tid = TID(td);
77	error = cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_TID,
78		(td == curthread) ? -1 : tid, cpusetsize, cpuset);
79	if (error == -1)
80		error = errno;
81	return (error);
82}
83