220 lines
9.1 KiB
C++
220 lines
9.1 KiB
C++
/*************************************************************************
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* $RCSfile: readguard.hxx,v $
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*
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* $Revision: 1.5 $
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*
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* last change: $Author: rt $ $Date: 2005-09-09 00:37:28 $
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*
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* The Contents of this file are made available subject to
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* the terms of GNU Lesser General Public License Version 2.1.
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*
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*
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* GNU Lesser General Public License Version 2.1
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* =============================================
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* Copyright 2005 by Sun Microsystems, Inc.
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* 901 San Antonio Road, Palo Alto, CA 94303, USA
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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 version 2.1, as published by the Free Software Foundation.
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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; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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************************************************************************/
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#ifndef __FRAMEWORK_THREADHELP_READGUARD_HXX_
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#define __FRAMEWORK_THREADHELP_READGUARD_HXX_
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//_________________________________________________________________________________________________________________
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// my own includes
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//_________________________________________________________________________________________________________________
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#ifndef __FRAMEWORK_THREADHELP_INONCOPYABLE_H_
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#include <threadhelp/inoncopyable.h>
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#endif
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#ifndef __FRAMEWORK_THREADHELP_IRWLOCK_H_
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#include <threadhelp/irwlock.h>
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#endif
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//#ifndef __FRAMEWORK_THREADHELP_THREADHELPBASE_HXX_
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//#include <threadhelp/threadhelpbase.hxx>
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//#endif
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//_________________________________________________________________________________________________________________
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// interface includes
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//_________________________________________________________________________________________________________________
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//_________________________________________________________________________________________________________________
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// other includes
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//_________________________________________________________________________________________________________________
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#ifndef _SAL_TYPES_H_
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#include <sal/types.h>
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#endif
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//_________________________________________________________________________________________________________________
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// namespace
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//_________________________________________________________________________________________________________________
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namespace framework{
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//_________________________________________________________________________________________________________________
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// const
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//_________________________________________________________________________________________________________________
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//_________________________________________________________________________________________________________________
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// declarations
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//_________________________________________________________________________________________________________________
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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 successfuly 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 realy ...
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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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@base INonCopyable
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@devstatus ready to use
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*//*-*************************************************************************************************************/
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class ReadGuard : private INonCopyable
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{
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//-------------------------------------------------------------------------------------------------------------
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// public methods
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//-------------------------------------------------------------------------------------------------------------
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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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//*********************************************************************************************************
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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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//-------------------------------------------------------------------------------------------------------------
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// private methods
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//-------------------------------------------------------------------------------------------------------------
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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 occure 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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//-------------------------------------------------------------------------------------------------------------
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// private member
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//-------------------------------------------------------------------------------------------------------------
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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 // #ifndef __FRAMEWORK_THREADHELP_READGUARD_HXX_
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