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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: gate.cxx,v $
*
* $Revision: 1.3 $
*
* last change: $Author: obo $ $Date: 2006-09-16 14:13:25 $
*
* 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_GATE_HXX_
#include <threadhelp/gate.hxx>
#endif
#ifndef __FRAMEWORK_THREADHELP_RESETABLEGUARD_HXX_
#include <threadhelp/resetableguard.hxx>
#endif
//_________________________________________________________________________________________________________________
// interface includes
//_________________________________________________________________________________________________________________
//_________________________________________________________________________________________________________________
// other includes
//_________________________________________________________________________________________________________________
//_________________________________________________________________________________________________________________
// const
//_________________________________________________________________________________________________________________
//_________________________________________________________________________________________________________________
// namespace
//_________________________________________________________________________________________________________________
namespace framework{
//_________________________________________________________________________________________________________________
// non exported const
//_________________________________________________________________________________________________________________
//_________________________________________________________________________________________________________________
// non exported declarations
//_________________________________________________________________________________________________________________
//_________________________________________________________________________________________________________________
// definitions
//_________________________________________________________________________________________________________________
//*****************************************************************************************************************
// constructor
//*****************************************************************************************************************
Gate::Gate()
: m_bClosed ( sal_False )
, m_bGapOpen ( sal_False )
{
open();
}
//*****************************************************************************************************************
// destructor
//*****************************************************************************************************************
Gate::~Gate()
{
open();
}
//*****************************************************************************************************************
// public method
//*****************************************************************************************************************
void Gate::open()
{
// We must safe access to our internal member!
ResetableGuard aLock( m_aAccessLock );
// Set condition -> wait don't block any longer -> gate is open
m_aPassage.set();
// Check if operation was successful!
// Check returns false if condition isn't set => m_bClosed will be true then => we must return false; opening failed
m_bClosed = ( m_aPassage.check() == sal_False );
}
//*****************************************************************************************************************
// public method
//*****************************************************************************************************************
void Gate::close()
{
// We must safe access to our internal member!
ResetableGuard aLock( m_aAccessLock );
// Reset condition -> wait blocks now -> gate is closed
m_aPassage.reset();
// Check if operation was successful!
// Check returns false if condition was reseted => m_bClosed will be true then => we can return true; closing ok
m_bClosed = ( m_aPassage.check() == sal_False );
}
//*****************************************************************************************************************
// public method
//*****************************************************************************************************************
void Gate::openGap()
{
// We must safe access to our internal member!
ResetableGuard aLock( m_aAccessLock );
// Open passage for current waiting threads.
m_aPassage.set();
// Check state of condition.
// If condition is set check() returns true => m_bGapOpen will be true too => we can use it as return value.
m_bGapOpen = ( m_aPassage.check() == sal_True );
}
//*****************************************************************************************************************
// public method
//*****************************************************************************************************************
sal_Bool Gate::wait( const TimeValue* pTimeOut )
{
// We must safe access to our internal member!
ResetableGuard aLock( m_aAccessLock );
// If gate not closed - caller can pass it.
sal_Bool bSuccessful = sal_True;
if( m_bClosed == sal_True )
{
// Otherwise first new thread must close an open gap!
if( m_bGapOpen == sal_True )
{
m_bGapOpen = sal_False;
m_aPassage.reset();
}
// Then we must release used access lock -
// because next call will block ...
// and if we hold the access lock nobody else can use this object without a dadlock!
aLock.unlock();
// Wait for opening gate ...
bSuccessful = ( m_aPassage.wait( pTimeOut ) == osl_cond_result_ok );
}
return bSuccessful;
}
//*****************************************************************************************************************
// public method
//*****************************************************************************************************************
sal_Bool Gate::isOpen() const
{
// I think we never need the access lock for pure reading of this bool member ...
return !m_bClosed;
}
} // namespace framework
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