95 lines
4.6 KiB
C++
95 lines
4.6 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: irwlock.h,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 00:36:45 $
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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_IRWLOCK_H_
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#define __FRAMEWORK_THREADHELP_IRWLOCK_H_
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//_________________________________________________________________________________________________________________
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// includes
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//_________________________________________________________________________________________________________________
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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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// declarations
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//_________________________________________________________________________________________________________________
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/*-************************************************************************************************************//**
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@descr A guard (specialy a write guard) support different internal working states.
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His lock can set for reading or writing/reading! Or he was unlocked by user ...
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*//*-*************************************************************************************************************/
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enum ELockMode
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{
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E_NOLOCK ,
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E_READLOCK ,
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E_WRITELOCK
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};
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/*-************************************************************************************************************//**
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@descr We implement two guards for using an rw-lock. But if you wish to implement
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different rw-locks to you will have problems by using with same guard implementation!
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Thats why we define this "pure virtual base class" ...
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All rw-locks must support this base interface for working and all guard must use this one too!
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*//*-*************************************************************************************************************/
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class IRWLock
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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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@descr These functions must be supported by a derived class!
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acquireReadAccess() -try to register thread as reader
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releaseReadAccess() -unregister thread as reader
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acquireWriteAccess() -try to register thread as writer
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releaseWriteAccess() -unregister thread as writer
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downgradeWriteAccess() -make writer to reader
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*//*-*****************************************************************************************************/
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virtual void acquireReadAccess () =0;
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virtual void releaseReadAccess () =0;
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virtual void acquireWriteAccess () =0;
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virtual void releaseWriteAccess () =0;
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virtual void downgradeWriteAccess () =0;
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}; // class IRWLock
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} // namespace framework
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#endif // #ifndef __FRAMEWORK_THREADHELP_IRWLOCK_H_
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