lib/libthread_xu/thread/thr_rwlockattr.c

   1 /*-
   2  * Copyright (c) 1998 Alex Nash
   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  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/lib/libpthread/thread/thr_rwlockattr.c,v 1.8 2002/09/16 08:45:35 mini Exp $
  27  * $DragonFly: src/lib/libthread_xu/thread/thr_rwlockattr.c,v 1.1 2005/02/01 12:38:27 davidxu Exp $
  28  */
  29
  30 #include <errno.h>
  31 #include <stdlib.h>
  32
  33 #include <pthread.h>
  34 #include "thr_private.h"
  35
  36 __weak_reference(_pthread_rwlockattr_destroy, pthread_rwlockattr_destroy);
  37 __weak_reference(_pthread_rwlockattr_getpshared, pthread_rwlockattr_getpshared);
  38 __weak_reference(_pthread_rwlockattr_init, pthread_rwlockattr_init);
  39 __weak_reference(_pthread_rwlockattr_setpshared, pthread_rwlockattr_setpshared);
  40
  41 int
  42 _pthread_rwlockattr_destroy(pthread_rwlockattr_t *rwlockattr)
  43 {
  44         pthread_rwlockattr_t prwlockattr;
  45
  46         if (rwlockattr == NULL)
  47                 return(EINVAL);
  48
  49         prwlockattr = *rwlockattr;
  50
  51         if (prwlockattr == NULL)
  52                 return(EINVAL);
  53
  54         free(prwlockattr);
  55
  56         return(0);
  57 }
  58
  59 int
  60 _pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *rwlockattr,
  61         int *pshared)
  62 {
  63         *pshared = (*rwlockattr)->pshared;
  64
  65         return(0);
  66 }
  67
  68 int
  69 _pthread_rwlockattr_init(pthread_rwlockattr_t *rwlockattr)
  70 {
  71         pthread_rwlockattr_t prwlockattr;
  72
  73         if (rwlockattr == NULL)
  74                 return(EINVAL);
  75
  76         prwlockattr = (pthread_rwlockattr_t)
  77                 malloc(sizeof(struct pthread_rwlockattr));
  78
  79         if (prwlockattr == NULL)
  80                 return(ENOMEM);
  81
  82         prwlockattr->pshared    = PTHREAD_PROCESS_PRIVATE;
  83         *rwlockattr             = prwlockattr;
  84
  85         return(0);
  86 }
  87
  88 int
  89 _pthread_rwlockattr_setpshared(pthread_rwlockattr_t *rwlockattr, int pshared)
  90 {
  91         /* Only PTHREAD_PROCESS_PRIVATE is supported. */
  92         if (pshared != PTHREAD_PROCESS_PRIVATE)
  93                 return(EINVAL);
  94
  95         (*rwlockattr)->pshared = pshared;
  96
  97         return(0);
  98 }
  99