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

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Revision 10 - (show annotations) (download)
Mon Sep 6 11:40:06 2010 UTC (9 years, 5 months ago) by william
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File size: 3328 byte(s)
exported r3113 from ./upstream/trunk
1 /*
2 * -------------------------------------------------------------
3 *
4 * Module: sem_getvalue.c
5 *
6 * Purpose:
7 * Semaphores aren't actually part of PThreads.
8 * They are defined by the POSIX Standard:
9 *
10 * POSIX 1003.1-2001
11 *
12 * -------------------------------------------------------------
13 *
14 * --------------------------------------------------------------------------
15 *
16 * Pthreads-win32 - POSIX Threads Library for Win32
17 * Copyright(C) 1998 John E. Bossom
18 * Copyright(C) 1999,2005 Pthreads-win32 contributors
19 *
20 * Contact Email: rpj@callisto.canberra.edu.au
21 *
22 * The current list of contributors is contained
23 * in the file CONTRIBUTORS included with the source
24 * code distribution. The list can also be seen at the
25 * following World Wide Web location:
26 * http://sources.redhat.com/pthreads-win32/contributors.html
27 *
28 * This library is free software; you can redistribute it and/or
29 * modify it under the terms of the GNU Lesser General Public
30 * License as published by the Free Software Foundation; either
31 * version 2 of the License, or (at your option) any later version.
32 *
33 * This library is distributed in the hope that it will be useful,
34 * but WITHOUT ANY WARRANTY; without even the implied warranty of
35 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
36 * Lesser General Public License for more details.
37 *
38 * You should have received a copy of the GNU Lesser General Public
39 * License along with this library in the file COPYING.LIB;
40 * if not, write to the Free Software Foundation, Inc.,
41 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
42 */
43
44 #include "ptw32pch.h"
45 #include "semaphore.h"
46
47
48 int
49 sem_getvalue (sem_t * sem, int *sval)
50 /*
51 * ------------------------------------------------------
52 * DOCPUBLIC
53 * This function stores the current count value of the
54 * semaphore.
55 * RESULTS
56 *
57 * Return value
58 *
59 * 0 sval has been set.
60 * -1 failed, error in errno
61 *
62 * in global errno
63 *
64 * EINVAL 'sem' is not a valid semaphore,
65 * ENOSYS this function is not supported,
66 *
67 *
68 * PARAMETERS
69 *
70 * sem pointer to an instance of sem_t
71 *
72 * sval pointer to int.
73 *
74 * DESCRIPTION
75 * This function stores the current count value of the semaphore
76 * pointed to by sem in the int pointed to by sval.
77 */
78 {
79 if (sem == NULL || *sem == NULL || sval == NULL)
80 {
81 errno = EINVAL;
82 return -1;
83 }
84 else
85 {
86 long value;
87 register sem_t s = *sem;
88 int result = 0;
89
90 if ((result = pthread_mutex_lock(&s->lock)) == 0)
91 {
92 /* See sem_destroy.c
93 */
94 if (*sem == NULL)
95 {
96 (void) pthread_mutex_unlock (&s->lock);
97 errno = EINVAL;
98 return -1;
99 }
100
101 value = s->value;
102 (void) pthread_mutex_unlock(&s->lock);
103 *sval = value;
104 }
105
106 return result;
107 }
108
109 } /* sem_getvalue */

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