179 lines
9.7 KiB
C++
179 lines
9.7 KiB
C++
/*************************************************************************
|
|
*
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* Copyright 2000, 2010 Oracle and/or its affiliates.
|
|
*
|
|
* OpenOffice.org - a multi-platform office productivity suite
|
|
*
|
|
* This file is part of OpenOffice.org.
|
|
*
|
|
* OpenOffice.org is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License version 3
|
|
* only, as published by the Free Software Foundation.
|
|
*
|
|
* OpenOffice.org is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License version 3 for more details
|
|
* (a copy is included in the LICENSE file that accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* version 3 along with OpenOffice.org. If not, see
|
|
* <http://www.openoffice.org/license.html>
|
|
* for a copy of the LGPLv3 License.
|
|
*
|
|
************************************************************************/
|
|
|
|
#ifndef __FRAMEWORK_THREADHELP_LOCKHELPER_HXX_
|
|
#define __FRAMEWORK_THREADHELP_LOCKHELPER_HXX_
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// my own includes
|
|
//_________________________________________________________________________________________________________________
|
|
|
|
#include <threadhelp/inoncopyable.h>
|
|
#include <threadhelp/imutex.h>
|
|
#include <threadhelp/irwlock.h>
|
|
#include <threadhelp/fairrwlock.hxx>
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// interface includes
|
|
//_________________________________________________________________________________________________________________
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// other includes
|
|
//_________________________________________________________________________________________________________________
|
|
#include <osl/mutex.hxx>
|
|
#include <vos/mutex.hxx>
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// namespace
|
|
//_________________________________________________________________________________________________________________
|
|
|
|
namespace framework{
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// const
|
|
//_________________________________________________________________________________________________________________
|
|
|
|
/*-************************************************************************************************************//**
|
|
@descr If you use a lock or mutex as a member of your class and whish to use it earlier then other ones
|
|
you should have a look on this implementation. You must use it as the first base class
|
|
of your implementation - because base classes are initialized by his order and before your
|
|
member! Thats why ist a good place to declare your thread help member so.
|
|
*//*-*************************************************************************************************************/
|
|
enum ELockType
|
|
{
|
|
E_NOTHING = 0 ,
|
|
E_OWNMUTEX = 1 ,
|
|
E_SOLARMUTEX = 2 ,
|
|
E_FAIRRWLOCK = 3
|
|
};
|
|
|
|
#define ENVVAR_LOCKTYPE DECLARE_ASCII("LOCKTYPE_FRAMEWORK")
|
|
#define FALLBACK_LOCKTYPE E_SOLARMUTEX
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// declarations
|
|
//_________________________________________________________________________________________________________________
|
|
|
|
/*-************************************************************************************************************//**
|
|
@short helper to set right lock in right situation
|
|
@descr This helper support different types of locking:
|
|
a) no locks - transparent for user!
|
|
This could be usefull for simluation or single threaded environments!
|
|
b) own mutex
|
|
An object use his own osl-mutex to be threadsafe. Usefull for easy and exclusiv locking.
|
|
c) solar mutex
|
|
An object use our solar mutex and will be a part of a greater safed "threadsafe code block".
|
|
Could be usefull for simulation and testing of higher modules!
|
|
d) fair rw-lock
|
|
An object use an implementation of a fair rw-lock. This increase granularity of t hreadsafe mechanism
|
|
and should be used for high performance threadsafe code!
|
|
|
|
@attention We support two interfaces - "IMutex" and "IRWLock". Don't mix using of it!
|
|
A guard implementation should use one interface only!
|
|
|
|
@implements IMutex
|
|
@implements IRWLock
|
|
|
|
@base INonCopyable
|
|
IMutex
|
|
IRWLock
|
|
|
|
@devstatus draft
|
|
*//*-*************************************************************************************************************/
|
|
class LockHelper : public IMutex
|
|
, public IRWLock
|
|
, private INonCopyable
|
|
{
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
// public methods
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
public:
|
|
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
// ctor/dtor
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
LockHelper( ::vos::IMutex* pSolarMutex = NULL );
|
|
virtual ~LockHelper( );
|
|
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
// interface ::framework::IMutex
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
virtual void acquire();
|
|
virtual void release();
|
|
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
// interface ::framework::IRWLock
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
virtual void acquireReadAccess ();
|
|
virtual void releaseReadAccess ();
|
|
virtual void acquireWriteAccess ();
|
|
virtual void releaseWriteAccess ();
|
|
virtual void downgradeWriteAccess();
|
|
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
// something else
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
static LockHelper& getGlobalLock ( ::vos::IMutex* pSolarMutex = NULL );
|
|
::osl::Mutex& getShareableOslMutex( );
|
|
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
// private methods
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
private:
|
|
|
|
static ELockType& implts_getLockType();
|
|
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
// private member
|
|
// a) Make some member mutable for using in const functions!
|
|
// b) "m_eLockType" define, which of follow members is used!
|
|
// You can use "m_pFairRWLock" as a fair rw-lock (multiple reader / one writer / looks for incoming order of threads too) ...
|
|
// or you can use a normal osl mutex ("m_pOwnMutex") ...
|
|
// ... or the solarmuex as "m_pSolarMutex" (must be set from outside! because some components must be vcl-free!)
|
|
// ... but sometimes you need a shareable osl mutex!
|
|
// 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.
|
|
// Creation and using of "m_pShareableOslMutex" isn't neccessary!
|
|
// ii ) Otherwise you have no osl mutex ... so you must create "m_pShareableOslMutex" and use it twice!
|
|
// In this case you must lock two member everytime - "m_pShareableMutex" AND "m_pFairRWLock" or "m_pSolarMutex" or ...
|
|
// It isn't realy fine - but the only possible way.
|
|
// iii) There exist another special case - E_NOTHING is set! Then we should create this shareable mutex ...
|
|
// nad you can use it ... but this implmentation ignore it.
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
private:
|
|
|
|
ELockType m_eLockType ;
|
|
|
|
mutable FairRWLock* m_pFairRWLock ;
|
|
mutable ::osl::Mutex* m_pOwnMutex ;
|
|
mutable ::vos::IMutex* m_pSolarMutex ;
|
|
mutable ::osl::Mutex* m_pShareableOslMutex ;
|
|
mutable sal_Bool m_bDummySolarMutex ;
|
|
};
|
|
|
|
} // namespace framework
|
|
|
|
#endif // #ifndef __FRAMEWORK_THREADHELP_LOCKHELPER_HXX_
|