← Back to branch summary

~ubuntu-branches/ubuntu/raring/clamav/raring-updates

« back to all changes in this revision

Viewing changes to win32/3rdparty/pthreads/pthread_spin_trylock.c

  • Committer: Bazaar Package Importer
  • Author(s): Scott Kitterman
  • Date: 2011-06-18 11:56:34 UTC
  • mfrom: (0.35.21 sid)
  • Revision ID: james.westby@ubuntu.com-20110618115634-u2lovivet0qx34d0
Tags: 0.97.1+dfsg-1ubuntu1
* Merge from debian unstable.  Remaining changes:
  - Drop build-dep on electric-fence (in Universe)
  - Add apparmor profiles for clamd and freshclam along with maintainer
    script changes

Show diffs side-by-side

added added

removed removed

Lines of Context:
win32/3rdparty/pthreads/pthread_spin_trylock.c
1
 
/*
2
 
 * pthread_spin_trylock.c
3
 
 *
4
 
 * Description:
5
 
 * This translation unit implements spin 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 "pthread.h"
38
 
#include "implement.h"
39
 
 
40
 
 
41
 
int
42
 
pthread_spin_trylock (pthread_spinlock_t * lock)
43
 
{
44
 
  register pthread_spinlock_t s;
45
 
 
46
 
  if (NULL == lock || NULL == *lock)
47
 
    {
48
 
      return (EINVAL);
49
 
    }
50
 
 
51
 
  if (*lock == PTHREAD_SPINLOCK_INITIALIZER)
52
 
    {
53
 
      int result;
54
 
 
55
 
      if ((result = ptw32_spinlock_check_need_init (lock)) != 0)
56
 
        {
57
 
          return (result);
58
 
        }
59
 
    }
60
 
 
61
 
  s = *lock;
62
 
 
63
 
  switch ((long)
64
 
          PTW32_INTERLOCKED_COMPARE_EXCHANGE ((PTW32_INTERLOCKED_LPLONG) &
65
 
                                              (s->interlock),
66
 
                                              (PTW32_INTERLOCKED_LONG)
67
 
                                              PTW32_SPIN_LOCKED,
68
 
                                              (PTW32_INTERLOCKED_LONG)
69
 
                                              PTW32_SPIN_UNLOCKED))
70
 
    {
71
 
    case PTW32_SPIN_UNLOCKED:
72
 
      return 0;
73
 
    case PTW32_SPIN_LOCKED:
74
 
      return EBUSY;
75
 
    case PTW32_SPIN_USE_MUTEX:
76
 
      return pthread_mutex_trylock (&(s->u.mutex));
77
 
    }
78
 
 
79
 
  return EINVAL;
80
 
}