lib/libc_r/uthread/uthread_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  *      $Id: uthread_rwlockattr.c,v 1.1 1998/09/07 19:01:43 alex Exp $
  27  */
  28
  29 #ifdef _THREAD_SAFE
  30 #include <errno.h>
  31 #include <stdlib.h>
  32
  33 #include <pthread.h>
  34 #include "pthread_private.h"
  35
  36 int
  37 pthread_rwlockattr_destroy (pthread_rwlockattr_t *rwlockattr)
  38 {
  39         pthread_rwlockattr_t prwlockattr;
  40
  41         if (rwlockattr == NULL)
  42                 return(EINVAL);
  43
  44         prwlockattr = *rwlockattr;
  45
  46         if (prwlockattr == NULL)
  47                 return(EINVAL);
  48
  49         free(prwlockattr);
  50
  51         return(0);
  52 }
  53
  54 int
  55 pthread_rwlockattr_getpshared (const pthread_rwlockattr_t *rwlockattr,
  56         int *pshared)
  57 {
  58         *pshared = (*rwlockattr)->pshared;
  59
  60         return(0);
  61 }
  62
  63 int
  64 pthread_rwlockattr_init (pthread_rwlockattr_t *rwlockattr)
  65 {
  66         pthread_rwlockattr_t prwlockattr;
  67
  68         if (rwlockattr == NULL)
  69                 return(EINVAL);
  70
  71         prwlockattr = (pthread_rwlockattr_t)
  72                 malloc(sizeof(struct pthread_rwlockattr));
  73
  74         if (prwlockattr == NULL)
  75                 return(ENOMEM);
  76
  77         prwlockattr->pshared    = PTHREAD_PROCESS_PRIVATE;
  78         *rwlockattr             = prwlockattr;
  79
  80         return(0);
  81 }
  82
  83 int
  84 pthread_rwlockattr_setpshared (pthread_rwlockattr_t *rwlockattr,
  85         int *pshared)
  86 {
  87         int ps = *pshared;
  88
  89         /* only PTHREAD_PROCESS_PRIVATE is supported */
  90         if (ps != PTHREAD_PROCESS_PRIVATE)
  91                 return(EINVAL);
  92
  93         (*rwlockattr)->pshared = ps;
  94
  95         return(0);
  96 }
  97
  98 #endif /* _THREAD_SAFE */