617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan/*******************************************************************************
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * Copyright (C) 2004-2008 Intel Corp. All rights reserved.
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan *
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * Redistribution and use in source and binary forms, with or without
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * modification, are permitted provided that the following conditions are met:
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan *
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * - Redistributions of source code must retain the above copyright notice,
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * this list of conditions and the following disclaimer.
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan *
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * - Redistributions in binary form must reproduce the above copyright notice,
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * this list of conditions and the following disclaimer in the documentation
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * and/or other materials provided with the distribution.
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan *
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * - Neither the name of Intel Corp. nor the names of its
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * contributors may be used to endorse or promote products derived from this
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * software without specific prior written permission.
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan *
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * ARE DISCLAIMED. IN NO EVENT SHALL Intel Corp. OR THE CONTRIBUTORS
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan * POSSIBILITY OF SUCH DAMAGE.
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan *******************************************************************************/
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan//////////////////////////////////////////////////////////////////////////
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan// Lock.h
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan//
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan// This file contains the definition and implementation of the Lock class
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan// and the TryLock class
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan//////////////////////////////////////////////////////////////////////////
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan#ifndef _LAD_LOCK_H
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan#define _LAD_LOCK_H
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan#include "RWLock.h"
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan#ifndef NULL
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan#define NULL 0
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan#endif
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Loganclass Lock
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan{
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Loganpublic:
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan Lock(Semaphore &sem) : _sem(&sem), _rw_lock(NULL)
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan {
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan _sem->acquire();
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan }
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan Lock(RWLock &rw_lock, RWLock::RWMode mode = RWLock::READ_ONLY) :
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan _sem(NULL), _rw_lock(&rw_lock)
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan {
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan _rw_lock->acquire(mode);
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan }
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan ~Lock()
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan {
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan if (_sem) {
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan _sem->release();
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan }
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan if (_rw_lock) {
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan _rw_lock->release();
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan }
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan }
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Loganprivate:
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan Semaphore *_sem;
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan RWLock *_rw_lock;
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan};
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Loganclass TryLock
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan{
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Loganpublic:
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan TryLock(Semaphore &sem, bool &is_locked) : _sem(&sem)
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan {
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan _locked = _sem->acquireTry();
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan is_locked = _locked;
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan }
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan ~TryLock()
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan {
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan if (_locked) {
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan _sem->release();
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan }
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan }
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Loganprivate:
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan bool _locked;
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan Semaphore *_sem;
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan};
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan#endif //_LAD_LOCK_H
617e2443dfc17fe44fd44c0675d6aad2ffc9df42Mark Logan