pthread_specific.c revision 1.14 
1/*	$NetBSD: pthread_specific.c,v 1.14 2007/12/01 01:19:31 ad Exp $	*/
2
3/*-
4 * Copyright (c) 2001, 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Nathan J. Williams.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *        This product includes software developed by the NetBSD
21 *        Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40__RCSID("$NetBSD: pthread_specific.c,v 1.14 2007/12/01 01:19:31 ad Exp $");
41
42/* Functions and structures dealing with thread-specific data */
43
44#include "pthread.h"
45#include "pthread_int.h"
46
47#include <sys/lwpctl.h>
48
49__strong_alias(__libc_thr_setspecific,pthread_setspecific)
50__strong_alias(__libc_thr_getspecific,pthread_getspecific)
51__strong_alias(__libc_thr_curcpu,pthread_curcpu_np)
52
53int
54pthread_setspecific(pthread_key_t key, const void *value)
55{
56	pthread_t self;
57
58	self = pthread__self();
59	/*
60	 * We can't win here on constness. Having been given a
61	 * "const void *", we can only assign it to other const void *,
62	 * and return it from functions that are const void *, without
63	 * generating a warning.
64	 */
65	/*LINTED const cast*/
66	self->pt_specific[key] = (void *) value;
67	self->pt_havespecific = 1;
68
69	return 0;
70}
71
72void *
73pthread_getspecific(pthread_key_t key)
74{
75
76	return pthread__self()->pt_specific[key];
77}
78
79unsigned int
80pthread_curcpu_np(void)
81{
82	lwpctl_t *lc = pthread__self()->pt_lwpctl;
83	if (lc == NULL)
84		return 0;
85	return lc->lc_curcpu;
86}
87