lib/libpthread/pthread_specific.c

   1 /*      $NetBSD: pthread_specific.c,v 1.20 2008/04/28 20:23:01 martin 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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __RCSID("$NetBSD: pthread_specific.c,v 1.20 2008/04/28 20:23:01 martin Exp $");
  34
  35 /* Functions and structures dealing with thread-specific data */
  36
  37 #include "pthread.h"
  38 #include "pthread_int.h"
  39
  40 #include <sys/lwpctl.h>
  41
  42 __strong_alias(__libc_thr_setspecific,pthread_setspecific)
  43 __strong_alias(__libc_thr_getspecific,pthread_getspecific)
  44 __strong_alias(__libc_thr_curcpu,pthread_curcpu_np)
  45
  46 int
  47 pthread_setspecific(pthread_key_t key, const void *value)
  48 {
  49         pthread_t self;
  50
  51         self = pthread__self();
  52         /*
  53          * We can't win here on constness. Having been given a
  54          * "const void *", we can only assign it to other const void *,
  55          * and return it from functions that are const void *, without
  56          * generating a warning.
  57          */
  58         /*LINTED const cast*/
  59         self->pt_specific[key] = (void *) value;
  60         self->pt_havespecific = 1;
  61
  62         return 0;
  63 }
  64
  65 void *
  66 pthread_getspecific(pthread_key_t key)
  67 {
  68
  69         return pthread__self()->pt_specific[key];
  70 }
  71
  72 unsigned int
  73 pthread_curcpu_np(void)
  74 {
  75
  76         return pthread__self()->pt_lwpctl->lc_curcpu;
  77 }