2010-07-15 23:35:37 +01:00
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/* $Id$
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Part of the SWI-Prolog Semweb package
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Author: Jan Wielemaker
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E-mail: wielemak@science.uva.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 2006, University of Amsterdam
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program 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
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GNU General Public License for more details.
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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; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef LOCK_H_INCLUDED
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#define LOCK_H_INCLUDED
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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2010-07-20 14:33:33 +01:00
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#if defined(__WINDOWS__) || defined(__MINGW32__)
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2010-07-15 23:35:37 +01:00
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#include <windows.h>
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#if defined(_REENTRANT) && defined(__WINDOWS__)
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enum
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{ SIGNAL = 0,
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MAX_EVENTS = 1
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} win32_event_t;
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typedef struct
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{ HANDLE events[MAX_EVENTS]; /* events to be signalled */
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int waiters; /* # waiters */
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} win32_cond_t;
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#endif
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#else
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#include <pthread.h>
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#endif
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typedef struct rwlock
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{
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#ifdef _REENTRANT
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#ifdef __WINDOWS__
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CRITICAL_SECTION mutex;
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CRITICAL_SECTION misc_mutex;
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win32_cond_t rdcondvar;
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win32_cond_t wrcondvar;
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win32_cond_t upcondvar;
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#else
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pthread_mutex_t mutex;
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pthread_mutex_t misc_mutex;
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pthread_cond_t rdcondvar;
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pthread_cond_t wrcondvar;
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pthread_cond_t upcondvar;
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#endif
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int waiting_readers;
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int waiting_writers;
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int waiting_upgrade;
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size_t thread_max;
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int *read_by_thread;
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int allow_readers;
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int lock_level; /* recursive locks */
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#endif
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int writer;
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int readers;
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} rwlock;
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int rdlock(rwlock *lock);
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int wrlock(rwlock *lock, int allow_readers);
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int lockout_readers(rwlock *lock);
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void reallow_readers(rwlock *lock);
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int unlock(rwlock *lock, int rd);
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int lock_misc(rwlock *lock);
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int unlock_misc(rwlock *lock);
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int init_lock(rwlock *lock);
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int destroy_lock(rwlock *lock);
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#endif /*LOCK_H_INCLUDED*/
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