[35dec5]: pthread_rwlock_timedwrlock.c Maximize Restore History

Download this file

pthread_rwlock_timedwrlock.c    140 lines (121 with data), 3.6 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
/*
* pthread_rwlock_timedwrlock.c
*
* Description:
* This translation unit implements read/write lock primitives.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <limits.h>
#include "pthread.h"
#include "implement.h"
int
pthread_rwlock_timedwrlock (pthread_rwlock_t * rwlock,
const struct timespec *abstime)
{
int result;
pthread_rwlock_t rwl;
if (rwlock == NULL || *rwlock == NULL)
{
return EINVAL;
}
/*
* We do a quick check to see if we need to do more work
* to initialise a static rwlock. We check
* again inside the guarded section of ptw32_rwlock_check_need_init()
* to avoid race conditions.
*/
if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
{
result = ptw32_rwlock_check_need_init (rwlock);
if (result != 0 && result != EBUSY)
{
return result;
}
}
rwl = *rwlock;
if (rwl->nMagic != PTW32_RWLOCK_MAGIC)
{
return EINVAL;
}
if ((result =
pthread_mutex_timedlock (&(rwl->mtxExclusiveAccess), abstime)) != 0)
{
return result;
}
if ((result =
pthread_mutex_timedlock (&(rwl->mtxSharedAccessCompleted),
abstime)) != 0)
{
(void) pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
return result;
}
if (rwl->nExclusiveAccessCount == 0)
{
if (rwl->nCompletedSharedAccessCount > 0)
{
rwl->nSharedAccessCount -= rwl->nCompletedSharedAccessCount;
rwl->nCompletedSharedAccessCount = 0;
}
if (rwl->nSharedAccessCount > 0)
{
rwl->nCompletedSharedAccessCount = -rwl->nSharedAccessCount;
/*
* This routine may be a cancelation point
* according to POSIX 1003.1j section 18.1.2.
*/
#ifdef _MSC_VER
#pragma inline_depth(0)
#endif
pthread_cleanup_push (ptw32_rwlock_cancelwrwait, (void *) rwl);
do
{
result =
pthread_cond_timedwait (&(rwl->cndSharedAccessCompleted),
&(rwl->mtxSharedAccessCompleted),
abstime);
}
while (result == 0 && rwl->nCompletedSharedAccessCount < 0);
pthread_cleanup_pop ((result != 0) ? 1 : 0);
#ifdef _MSC_VER
#pragma inline_depth()
#endif
if (result == 0)
{
rwl->nSharedAccessCount = 0;
}
}
}
if (result == 0)
{
rwl->nExclusiveAccessCount++;
}
return result;
}