thr_rwlockattr.c revision 214046 
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: head/lib/libthr/thread/thr_rwlockattr.c 214046 2010-10-18 23:37:56Z davidxu $
27 */
28
29#include "namespace.h"
30#include <errno.h>
31#include <stdlib.h>
32#include <pthread.h>
33#include "un-namespace.h"
34
35#include "thr_private.h"
36
37__weak_reference(_pthread_rwlockattr_destroy, pthread_rwlockattr_destroy);
38__weak_reference(_pthread_rwlockattr_getpshared, pthread_rwlockattr_getpshared);
39__weak_reference(_pthread_rwlockattr_getkind_np, pthread_rwlockattr_getkind_np);
40__weak_reference(_pthread_rwlockattr_init, pthread_rwlockattr_init);
41__weak_reference(_pthread_rwlockattr_setpshared, pthread_rwlockattr_setpshared);
42__weak_reference(_pthread_rwlockattr_setkind_np, pthread_rwlockattr_setkind_np);
43
44int
45_pthread_rwlockattr_destroy(pthread_rwlockattr_t *rwlockattr)
46{
47	pthread_rwlockattr_t prwlockattr;
48
49	if (rwlockattr == NULL)
50		return(EINVAL);
51
52	prwlockattr = *rwlockattr;
53
54	if (prwlockattr == NULL)
55		return(EINVAL);
56
57	free(prwlockattr);
58
59	return(0);
60}
61
62int
63_pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *rwlockattr,
64	int *pshared)
65{
66	*pshared = (*rwlockattr)->pshared;
67
68	return(0);
69}
70
71int
72_pthread_rwlockattr_init(pthread_rwlockattr_t *rwlockattr)
73{
74	pthread_rwlockattr_t prwlockattr;
75
76	if (rwlockattr == NULL)
77		return(EINVAL);
78
79	prwlockattr = (pthread_rwlockattr_t)
80		malloc(sizeof(struct pthread_rwlockattr));
81
82	if (prwlockattr == NULL)
83		return(ENOMEM);
84
85	prwlockattr->pshared 	= PTHREAD_PROCESS_PRIVATE;
86	prwlockattr->kind	= PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP;
87	*rwlockattr		= prwlockattr;
88
89	return(0);
90}
91
92int
93_pthread_rwlockattr_setpshared(pthread_rwlockattr_t *rwlockattr, int pshared)
94{
95	/* Only PTHREAD_PROCESS_PRIVATE is supported. */
96	if (pshared != PTHREAD_PROCESS_PRIVATE)
97		return(EINVAL);
98
99	(*rwlockattr)->pshared = pshared;
100
101	return(0);
102}
103
104int
105_pthread_rwlockattr_setkind_np(pthread_rwlockattr_t *attr, int kind)
106{
107	if (kind != PTHREAD_RWLOCK_PREFER_READER_NP &&
108	    kind != PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP &&
109	    kind != PTHREAD_RWLOCK_PREFER_WRITER_NP) {
110		return (EINVAL);
111	}
112	(*attr)->kind = kind;
113	return (0);
114}
115
116int
117_pthread_rwlockattr_getkind_np(const pthread_rwlockattr_t *attr, int *kind)
118{
119	*kind = (*attr)->kind;
120	return (0);
121}
122