204 lines
8.8 KiB
C++
204 lines
8.8 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_READGUARD_HXX_
|
|
#define __FRAMEWORK_THREADHELP_READGUARD_HXX_
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// my own includes
|
|
//_________________________________________________________________________________________________________________
|
|
|
|
#include <threadhelp/inoncopyable.h>
|
|
#include <threadhelp/irwlock.h>
|
|
|
|
//#ifndef __FRAMEWORK_THREADHELP_THREADHELPBASE_HXX_
|
|
//#include <threadhelp/threadhelpbase.hxx>
|
|
//#endif
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// interface includes
|
|
//_________________________________________________________________________________________________________________
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// other includes
|
|
//_________________________________________________________________________________________________________________
|
|
#include <sal/types.h>
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// namespace
|
|
//_________________________________________________________________________________________________________________
|
|
|
|
namespace framework{
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// const
|
|
//_________________________________________________________________________________________________________________
|
|
|
|
//_________________________________________________________________________________________________________________
|
|
// declarations
|
|
//_________________________________________________________________________________________________________________
|
|
|
|
/*-************************************************************************************************************//**
|
|
@short implement a guard to set read locks
|
|
@descr This guard should be used to set a lock for reading object internal member.
|
|
Nobody can control it but don't use member after successfuly locking for writing!
|
|
We never need a own mutex to safe our internal member access - because
|
|
a guard is used as function-local member only. There exist no multithreaded access to it realy ...
|
|
|
|
@attention a) To prevent us against wrong using, the default ctor, copy ctor and the =operator are maked private!
|
|
b) Use interface "IRWLock" of set LockHelper only - because we must support a finer granularity of locking.
|
|
Interface "IMutex" should be used by easier guard implementations ... like "ResetableGuard"!
|
|
|
|
@implements -
|
|
@base INonCopyable
|
|
|
|
@devstatus ready to use
|
|
*//*-*************************************************************************************************************/
|
|
class ReadGuard : private INonCopyable
|
|
{
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
// public methods
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
public:
|
|
|
|
/*-****************************************************************************************************//**
|
|
@short ctor
|
|
@descr These ctors initialize the guard with a reference to used lock member of object to protect.
|
|
Null isn't allowed as value!
|
|
|
|
@seealso -
|
|
|
|
@param "pLock" ,reference to used lock member of object to protect
|
|
@param "rLock" ,reference to used lock member of object to protect
|
|
@return -
|
|
|
|
@onerror -
|
|
*//*-*****************************************************************************************************/
|
|
inline ReadGuard( IRWLock* pLock )
|
|
: m_pLock ( pLock )
|
|
, m_bLocked ( sal_False )
|
|
{
|
|
lock();
|
|
}
|
|
|
|
//*********************************************************************************************************
|
|
inline ReadGuard( IRWLock& rLock )
|
|
: m_pLock ( &rLock )
|
|
, m_bLocked ( sal_False )
|
|
{
|
|
lock();
|
|
}
|
|
|
|
/*-****************************************************************************************************//**
|
|
@short dtor
|
|
@descr We unlock the used lock member automaticly if user forget it.
|
|
|
|
@seealso -
|
|
|
|
@param -
|
|
@return -
|
|
|
|
@onerror -
|
|
*//*-*****************************************************************************************************/
|
|
inline ~ReadGuard()
|
|
{
|
|
unlock();
|
|
}
|
|
|
|
/*-****************************************************************************************************//**
|
|
@short set read lock
|
|
@descr Call this method to set the read lock. The call will block till all current threads are synchronized!
|
|
|
|
@seealso method unlock()
|
|
|
|
@param -
|
|
@return -
|
|
|
|
@onerror -
|
|
*//*-*****************************************************************************************************/
|
|
inline void lock()
|
|
{
|
|
if( m_bLocked == sal_False )
|
|
{
|
|
m_pLock->acquireReadAccess();
|
|
m_bLocked = sal_True;
|
|
}
|
|
}
|
|
|
|
/*-****************************************************************************************************//**
|
|
@short unset read lock
|
|
@descr Call this method to unlock the rw-lock temp.!
|
|
Normaly we do it at dtor automaticly for you ...
|
|
|
|
@seealso method lock()
|
|
|
|
@param -
|
|
@return -
|
|
|
|
@onerror -
|
|
*//*-*****************************************************************************************************/
|
|
inline void unlock()
|
|
{
|
|
if( m_bLocked == sal_True )
|
|
{
|
|
m_pLock->releaseReadAccess();
|
|
m_bLocked = sal_False;
|
|
}
|
|
}
|
|
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
// private methods
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
private:
|
|
|
|
/*-****************************************************************************************************//**
|
|
@short disable using of these functions!
|
|
@descr It's not allowed to use this methods. Different problem can occure otherwise.
|
|
Thats why we disable it by make it private.
|
|
|
|
@seealso other ctor
|
|
|
|
@param -
|
|
@return -
|
|
|
|
@onerror -
|
|
*//*-*****************************************************************************************************/
|
|
ReadGuard();
|
|
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
// private member
|
|
//-------------------------------------------------------------------------------------------------------------
|
|
private:
|
|
|
|
IRWLock* m_pLock ; /// reference to lock-member of protected object
|
|
sal_Bool m_bLocked ; /// protection against multiple lock calls without unlock!
|
|
|
|
}; // class ReadGuard
|
|
|
|
} // namespace framework
|
|
|
|
#endif // #ifndef __FRAMEWORK_THREADHELP_READGUARD_HXX_
|