230 lines
11 KiB
C++
230 lines
11 KiB
C++
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/*************************************************************************
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*
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* $RCSfile: lockhelper.hxx,v $
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*
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* $Revision: 1.1 $
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*
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* last change: $Author: as $ $Date: 2001-06-11 10:11:46 $
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*
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* The Contents of this file are made available subject to the terms of
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* either of the following licenses
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*
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* - GNU Lesser General Public License Version 2.1
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* - Sun Industry Standards Source License Version 1.1
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*
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* Sun Microsystems Inc., October, 2000
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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 2000 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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* Sun Industry Standards Source License Version 1.1
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* =================================================
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* The contents of this file are subject to the Sun Industry Standards
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* Source License Version 1.1 (the "License"); You may not use this file
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* except in compliance with the License. You may obtain a copy of the
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* License at http://www.openoffice.org/license.html.
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*
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* Software provided under this License is provided on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
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* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
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* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
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* See the License for the specific provisions governing your rights and
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* obligations concerning the Software.
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*
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* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
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*
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* Copyright: 2000 by Sun Microsystems, Inc.
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*
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* All Rights Reserved.
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*
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* Contributor(s): _______________________________________
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*
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*
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************************************************************************/
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#ifndef __FRAMEWORK_THREADHELP_LOCKHELPER_HXX_
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#define __FRAMEWORK_THREADHELP_LOCKHELPER_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_IMUTEX_H_
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#include <threadhelp/imutex.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_FAIRRWLOCK_HXX_
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#include <threadhelp/fairrwlock.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 _OSL_MUTEX_HXX_
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#include <osl/mutex.hxx>
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#endif
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#ifndef _VOS_MUTEX_HXX_
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#include <vos/mutex.hxx>
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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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@descr If you use a lock or mutex as a member of your class and whish to use it earlier then other ones
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you should have a look on this implementation. You must use it as the first base class
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of your implementation - because base classes are initialized by his order and before your
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member! Thats why ist a good place to declare your thread help member so.
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*//*-*************************************************************************************************************/
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enum ELockType
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{
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E_NOTHING = 0 ,
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E_OWNMUTEX = 1 ,
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E_SOLARMUTEX = 2 ,
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E_FAIRRWLOCK = 3
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};
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#define ENVVAR_LOCKTYPE DECLARE_ASCII("LOCKTYPE_FRAMEWORK")
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#define FALLBACK_LOCKTYPE E_OWNMUTEX
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//_________________________________________________________________________________________________________________
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// declarations
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//_________________________________________________________________________________________________________________
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/*-************************************************************************************************************//**
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@short helper to set right lock in right situation
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@descr This helper support different types of locking:
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a) no locks - transparent for user!
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This could be usefull for simluation or single threaded environments!
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b) own mutex
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An object use his own osl-mutex to be threadsafe. Usefull for easy and exclusiv locking.
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c) solar mutex
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An object use our solar mutex and will be a part of a greater safed "threadsafe code block".
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Could be usefull for simulation and testing of higher modules!
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d) fair rw-lock
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An object use an implementation of a fair rw-lock. This increase granularity of t hreadsafe mechanism
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and should be used for high performance threadsafe code!
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@attention We support two interfaces - "IMutex" and "IRWLock". Don't mix using of it!
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A guard implementation should use one interface only!
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@implements IMutex
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@implements IRWLock
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@base INonCopyable
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IMutex
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IRWLock
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@devstatus draft
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*//*-*************************************************************************************************************/
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class LockHelper : public IMutex
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, public IRWLock
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, 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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// ctor/dtor
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//-------------------------------------------------------------------------------------------------------------
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LockHelper( ::vos::IMutex* pSolarMutex = NULL );
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virtual ~LockHelper( );
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//-------------------------------------------------------------------------------------------------------------
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// interface ::framework::IMutex
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//-------------------------------------------------------------------------------------------------------------
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virtual void acquire();
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virtual void release();
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//-------------------------------------------------------------------------------------------------------------
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// interface ::framework::IRWLock
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//-------------------------------------------------------------------------------------------------------------
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virtual void acquireReadAccess ();
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virtual void releaseReadAccess ();
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virtual void acquireWriteAccess ();
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virtual void releaseWriteAccess ();
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virtual void downgradeWriteAccess();
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//-------------------------------------------------------------------------------------------------------------
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// something else
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//-------------------------------------------------------------------------------------------------------------
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static LockHelper& getGlobalLock ( ::vos::IMutex* pSolarMutex = NULL );
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::osl::Mutex& getShareableOslMutex( );
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//-------------------------------------------------------------------------------------------------------------
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// private methods
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//-------------------------------------------------------------------------------------------------------------
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private:
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static ELockType& implts_getLockType();
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//-------------------------------------------------------------------------------------------------------------
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// private member
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// a) Make some member mutable for using in const functions!
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// b) "m_eLockType" define, which of follow members is used!
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// You can use "m_pFairRWLock" as a fair rw-lock (multiple reader / one writer / looks for incoming order of threads too) ...
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// or you can use a normal osl mutex ("m_pOwnMutex") ...
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// ... or the solarmuex as "m_pSolarMutex" (must be set from outside! because some components must be vcl-free!)
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// ... but sometimes you need a shareable osl mutex!
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// In this case you has some problems: i ) If your lock type is set to E_OWNMUTEX => it's easy; you can use your member "m_pOwnMutex" - it's a osl mutex.
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// Creation and using of "m_pShareableOslMutex" isn't neccessary!
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// ii ) Otherwise you have no osl mutex ... so you must create "m_pShareableOslMutex" and use it twice!
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// In this case you must lock two member everytime - "m_pShareableMutex" AND "m_pFairRWLock" or "m_pSolarMutex" or ...
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// It isn't realy fine - but the only possible way.
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// iii) There exist another special case - E_NOTHING is set! Then we should create this shareable mutex ...
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// nad you can use it ... but this implmentation ignore it.
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//-------------------------------------------------------------------------------------------------------------
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private:
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ELockType m_eLockType ;
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mutable FairRWLock* m_pFairRWLock ;
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mutable ::osl::Mutex* m_pOwnMutex ;
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mutable ::vos::IMutex* m_pSolarMutex ;
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mutable ::osl::Mutex* m_pShareableOslMutex ;
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};
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} // namespace framework
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#endif // #ifndef __FRAMEWORK_THREADHELP_LOCKHELPER_HXX_
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