140 lines
3.6 KiB
C
140 lines
3.6 KiB
C
/*
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* pthread_rwlock_timedwrlock.c
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*
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* Description:
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* This translation unit implements read/write lock primitives.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <limits.h>
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#include "pthread.h"
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#include "implement.h"
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int
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pthread_rwlock_timedwrlock (pthread_rwlock_t * rwlock,
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const struct timespec *abstime)
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{
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int result;
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pthread_rwlock_t rwl;
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if (rwlock == NULL || *rwlock == NULL)
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{
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return EINVAL;
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}
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/*
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* We do a quick check to see if we need to do more work
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* to initialise a static rwlock. We check
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* again inside the guarded section of ptw32_rwlock_check_need_init()
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* to avoid race conditions.
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*/
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if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
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{
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result = ptw32_rwlock_check_need_init (rwlock);
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if (result != 0 && result != EBUSY)
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{
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return result;
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}
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}
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rwl = *rwlock;
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if (rwl->nMagic != PTW32_RWLOCK_MAGIC)
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{
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return EINVAL;
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}
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if ((result =
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pthread_mutex_timedlock (&(rwl->mtxExclusiveAccess), abstime)) != 0)
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{
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return result;
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}
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if ((result =
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pthread_mutex_timedlock (&(rwl->mtxSharedAccessCompleted),
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abstime)) != 0)
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{
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(void) pthread_mutex_unlock (&(rwl->mtxExclusiveAccess));
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return result;
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}
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if (rwl->nExclusiveAccessCount == 0)
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{
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if (rwl->nCompletedSharedAccessCount > 0)
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{
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rwl->nSharedAccessCount -= rwl->nCompletedSharedAccessCount;
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rwl->nCompletedSharedAccessCount = 0;
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}
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if (rwl->nSharedAccessCount > 0)
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{
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rwl->nCompletedSharedAccessCount = -rwl->nSharedAccessCount;
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/*
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* This routine may be a cancelation point
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* according to POSIX 1003.1j section 18.1.2.
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*/
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#if defined(_MSC_VER) && _MSC_VER < 1400
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#pragma inline_depth(0)
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#endif
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pthread_cleanup_push (ptw32_rwlock_cancelwrwait, (void *) rwl);
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do
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{
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result =
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pthread_cond_timedwait (&(rwl->cndSharedAccessCompleted),
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&(rwl->mtxSharedAccessCompleted),
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abstime);
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}
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while (result == 0 && rwl->nCompletedSharedAccessCount < 0);
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pthread_cleanup_pop ((result != 0) ? 1 : 0);
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#if defined(_MSC_VER) && _MSC_VER < 1400
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#pragma inline_depth()
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#endif
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if (result == 0)
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{
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rwl->nSharedAccessCount = 0;
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}
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}
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}
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if (result == 0)
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{
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rwl->nExclusiveAccessCount++;
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}
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return result;
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}
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