/[pcsx2_0.9.7]/trunk/3rdparty/w32pthreads/pthread_rwlockattr_getpshared.c
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Contents of /trunk/3rdparty/w32pthreads/pthread_rwlockattr_getpshared.c

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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (9 years, 10 months ago) by william
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committing r3113 initial commit again...
1 /*
2 * pthread_rwlockattr_getpshared.c
3 *
4 * Description:
5 * This translation unit implements read/write lock primitives.
6 *
7 * --------------------------------------------------------------------------
8 *
9 * Pthreads-win32 - POSIX Threads Library for Win32
10 * Copyright(C) 1998 John E. Bossom
11 * Copyright(C) 1999,2005 Pthreads-win32 contributors
12 *
13 * Contact Email: rpj@callisto.canberra.edu.au
14 *
15 * The current list of contributors is contained
16 * in the file CONTRIBUTORS included with the source
17 * code distribution. The list can also be seen at the
18 * following World Wide Web location:
19 * http://sources.redhat.com/pthreads-win32/contributors.html
20 *
21 * This library is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU Lesser General Public
23 * License as published by the Free Software Foundation; either
24 * version 2 of the License, or (at your option) any later version.
25 *
26 * This library is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
29 * Lesser General Public License for more details.
30 *
31 * You should have received a copy of the GNU Lesser General Public
32 * License along with this library in the file COPYING.LIB;
33 * if not, write to the Free Software Foundation, Inc.,
34 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
35 */
36
37 #include "ptw32pch.h"
38
39 int
40 pthread_rwlockattr_getpshared (const pthread_rwlockattr_t * attr,
41 int *pshared)
42 /*
43 * ------------------------------------------------------
44 * DOCPUBLIC
45 * Determine whether rwlocks created with 'attr' can be
46 * shared between processes.
47 *
48 * PARAMETERS
49 * attr
50 * pointer to an instance of pthread_rwlockattr_t
51 *
52 * pshared
53 * will be set to one of:
54 *
55 * PTHREAD_PROCESS_SHARED
56 * May be shared if in shared memory
57 *
58 * PTHREAD_PROCESS_PRIVATE
59 * Cannot be shared.
60 *
61 *
62 * DESCRIPTION
63 * Rwlocks creatd with 'attr' can be shared between
64 * processes if pthread_rwlock_t variable is allocated
65 * in memory shared by these processes.
66 * NOTES:
67 * 1) pshared rwlocks MUST be allocated in shared
68 * memory.
69 * 2) The following macro is defined if shared rwlocks
70 * are supported:
71 * _POSIX_THREAD_PROCESS_SHARED
72 *
73 * RESULTS
74 * 0 successfully retrieved attribute,
75 * EINVAL 'attr' is invalid,
76 *
77 * ------------------------------------------------------
78 */
79 {
80 int result;
81
82 if ((attr != NULL && *attr != NULL) && (pshared != NULL))
83 {
84 *pshared = (*attr)->pshared;
85 result = 0;
86 }
87 else
88 {
89 result = EINVAL;
90 }
91
92 return (result);
93
94 } /* pthread_rwlockattr_getpshared */

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