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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: writeguard.cxx,v $
*
* $Revision: 1.5 $
*
* last change: $Author: obo $ $Date: 2006-09-16 14:14:50 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_framework.hxx"
//_________________________________________________________________________________________________________________
// my own includes
//_________________________________________________________________________________________________________________
#ifndef __FRAMEWORK_THREADHELP_WRITEGUARD_HXX_
#include <threadhelp/writeguard.hxx>
#endif
#ifndef __FRAMEWORK_MACROS_DEBUG_HXX_
#include <macros/debug.hxx>
#endif
//_________________________________________________________________________________________________________________
// interface includes
//_________________________________________________________________________________________________________________
//_________________________________________________________________________________________________________________
// other includes
//_________________________________________________________________________________________________________________
//_________________________________________________________________________________________________________________
// const
//_________________________________________________________________________________________________________________
//_________________________________________________________________________________________________________________
// namespace
//_________________________________________________________________________________________________________________
namespace framework{
//_________________________________________________________________________________________________________________
// non exported const
//_________________________________________________________________________________________________________________
//_________________________________________________________________________________________________________________
// non exported declarations
//_________________________________________________________________________________________________________________
//_________________________________________________________________________________________________________________
// definitions
//_________________________________________________________________________________________________________________
/*-****************************************************************************************************//**
@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 -
*//*-*****************************************************************************************************/
WriteGuard::WriteGuard( IRWLock* pLock )
: m_pLock ( pLock )
, m_eMode ( E_NOLOCK )
{
lock();
}
//*****************************************************************************************************************
WriteGuard::WriteGuard( IRWLock& rLock )
: m_pLock ( &rLock )
, m_eMode ( E_NOLOCK )
{
lock();
}
/*-****************************************************************************************************//**
@short dtor
@descr We unlock the used lock member automaticly if user forget it.
@seealso -
@param -
@return -
@onerror -
*//*-*****************************************************************************************************/
WriteGuard::~WriteGuard()
{
unlock();
}
/*-****************************************************************************************************//**
@short set write lock
@descr Call this method to set the write lock. The call will block till all current threads are synchronized!
@seealso method unlock()
@param -
@return -
@onerror -
*//*-*****************************************************************************************************/
void WriteGuard::lock()
{
switch( m_eMode )
{
case E_NOLOCK : {
// Acquire write access and set return state.
// Mode is set later if it was successful!
m_pLock->acquireWriteAccess();
m_eMode = E_WRITELOCK;
}
break;
case E_READLOCK : {
// User has downgrade to read access before!
// We must release it before we can set a new write access!
m_pLock->releaseReadAccess ();
m_pLock->acquireWriteAccess();
m_eMode = E_WRITELOCK;
}
break;
}
}
/*-****************************************************************************************************//**
@short unset write 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 -
*//*-*****************************************************************************************************/
void WriteGuard::unlock()
{
switch( m_eMode )
{
case E_READLOCK : {
// Use has downgraded to a read lock!
m_pLock->releaseReadAccess();
m_eMode = E_NOLOCK;
}
break;
case E_WRITELOCK : {
m_pLock->releaseWriteAccess();
m_eMode = E_NOLOCK;
}
break;
}
}
/*-****************************************************************************************************//**
@short downgrade write access to read access without new blocking!
@descr If this write lock is set you can change it to a "read lock".
An "upgrade" is the same like new calling "lock()"!
@seealso -
@param -
@return -
@onerror -
*//*-*****************************************************************************************************/
void WriteGuard::downgrade()
{
if( m_eMode == E_WRITELOCK )
{
m_pLock->downgradeWriteAccess();
m_eMode = E_READLOCK;
}
}
/*-****************************************************************************************************//**
@short return internal lock state
@descr For user they dont know what they are doing there ...
@seealso -
@param -
@return Current set lock mode.
@onerror No error should occure.
*//*-*****************************************************************************************************/
ELockMode WriteGuard::getMode() const
{
return m_eMode;
}
} // namespace framework
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