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

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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (9 years, 11 months ago) by william
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committing r3113 initial commit again...
1 /*
2 * errno.c
3 *
4 * Description:
5 * This translation unit implements routines associated with spawning a new
6 * thread.
7 *
8 * --------------------------------------------------------------------------
9 *
10 * Pthreads-win32 - POSIX Threads Library for Win32
11 * Copyright(C) 1998 John E. Bossom
12 * Copyright(C) 1999,2005 Pthreads-win32 contributors
13 *
14 * Contact Email: rpj@callisto.canberra.edu.au
15 *
16 * The current list of contributors is contained
17 * in the file CONTRIBUTORS included with the source
18 * code distribution. The list can also be seen at the
19 * following World Wide Web location:
20 * http://sources.redhat.com/pthreads-win32/contributors.html
21 *
22 * This library is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU Lesser General Public
24 * License as published by the Free Software Foundation; either
25 * version 2 of the License, or (at your option) any later version.
26 *
27 * This library is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
30 * Lesser General Public License for more details.
31 *
32 * You should have received a copy of the GNU Lesser General Public
33 * License along with this library in the file COPYING.LIB;
34 * if not, write to the Free Software Foundation, Inc.,
35 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
36 */
37
38 #include "ptw32pch.h"
39
40 #if defined(NEED_ERRNO)
41
42 static int reallyBad = ENOMEM;
43
44 /*
45 * Re-entrant errno.
46 *
47 * Each thread has it's own errno variable in pthread_t.
48 *
49 * The benefit of using the pthread_t structure
50 * instead of another TSD key is TSD keys are limited
51 * on Win32 to 64 per process. Secondly, to implement
52 * it properly without using pthread_t you'd need
53 * to dynamically allocate an int on starting the thread
54 * and store it manually into TLS and then ensure that you free
55 * it on thread termination. We get all that for free
56 * by simply storing the errno on the pthread_t structure.
57 *
58 * MSVC and Mingw32 already have their own thread-safe errno.
59 *
60 * #if defined( _REENTRANT ) || defined( _MT )
61 * #define errno *_errno()
62 *
63 * int *_errno( void );
64 * #else
65 * extern int errno;
66 * #endif
67 *
68 */
69
70 int *
71 _errno (void)
72 {
73 pthread_t self;
74 int *result;
75
76 if ((self = pthread_self ()) == NULL)
77 {
78 /*
79 * Yikes! unable to allocate a thread!
80 * Throw an exception? return an error?
81 */
82 result = &reallyBad;
83 }
84 else
85 {
86 result = &(self->ptErrno);
87 }
88
89 return (result);
90
91 } /* _errno */
92
93 #endif /* (NEED_ERRNO) */

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