172 lines
6.2 KiB
C++
172 lines
6.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_FRAMEWORK_INC_THREADHELP_READGUARD_HXX
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#define INCLUDED_FRAMEWORK_INC_THREADHELP_READGUARD_HXX
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#include <boost/noncopyable.hpp>
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#include <threadhelp/irwlock.h>
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#include <sal/types.h>
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namespace framework{
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/*-************************************************************************************************************
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@short implement a guard to set read locks
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@descr This guard should be used to set a lock for reading object internal member.
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Nobody can control it but don't use member after successfully locking for writing!
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We never need a own mutex to safe our internal member access - because
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a guard is used as function-local member only. There exist no multithreaded access to it really ...
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@attention a) To prevent us against wrong using, the default ctor, copy ctor and the =operator are maked private!
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b) Use interface "IRWLock" of set LockHelper only - because we must support a finer granularity of locking.
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Interface "IMutex" should be used by easier guard implementations ... like "ResetableGuard"!
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@implements -
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@devstatus ready to use
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*//*-*************************************************************************************************************/
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class ReadGuard : private boost::noncopyable
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{
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// public methods
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public:
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/*-****************************************************************************************************
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@short ctor
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@descr These ctors initialize the guard with a reference to used lock member of object to protect.
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Null isn't allowed as value!
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@seealso -
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@param "pLock" ,reference to used lock member of object to protect
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@param "rLock" ,reference to used lock member of object to protect
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@return -
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@onerror -
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*//*-*****************************************************************************************************/
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inline ReadGuard( IRWLock* pLock )
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: m_pLock ( pLock )
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, m_bLocked ( sal_False )
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{
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lock();
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}
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inline ReadGuard( IRWLock& rLock )
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: m_pLock ( &rLock )
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, m_bLocked ( sal_False )
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{
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lock();
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}
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/*-****************************************************************************************************
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@short dtor
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@descr We unlock the used lock member automaticly if user forget it.
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@seealso -
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@param -
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@return -
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@onerror -
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*//*-*****************************************************************************************************/
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inline ~ReadGuard()
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{
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unlock();
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}
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/*-****************************************************************************************************
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@short set read lock
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@descr Call this method to set the read lock. The call will block till all current threads are synchronized!
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@seealso method unlock()
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@param -
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@return -
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@onerror -
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*//*-*****************************************************************************************************/
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inline void lock()
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{
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if( m_bLocked == sal_False )
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{
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m_pLock->acquireReadAccess();
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m_bLocked = sal_True;
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}
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}
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/*-****************************************************************************************************
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@short unset read lock
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@descr Call this method to unlock the rw-lock temp.!
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Normaly we do it at dtor automaticly for you ...
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@seealso method lock()
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@param -
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@return -
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@onerror -
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*//*-*****************************************************************************************************/
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inline void unlock()
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{
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if( m_bLocked == sal_True )
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{
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m_pLock->releaseReadAccess();
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m_bLocked = sal_False;
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}
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}
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// private methods
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private:
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/*-****************************************************************************************************
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@short disable using of these functions!
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@descr It's not allowed to use this methods. Different problem can occur otherwise.
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Thats why we disable it by make it private.
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@seealso other ctor
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@param -
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@return -
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@onerror -
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*//*-*****************************************************************************************************/
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ReadGuard();
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// private member
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private:
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IRWLock* m_pLock ; /// reference to lock-member of protected object
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sal_Bool m_bLocked ; /// protection against multiple lock calls without unlock!
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}; // class ReadGuard
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} // namespace framework
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#endif // INCLUDED_FRAMEWORK_INC_THREADHELP_READGUARD_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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