251 lines
11 KiB
C++
251 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org 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
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#ifndef __FRAMEWORK_THREADHELP_GATE_HXX_
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#define __FRAMEWORK_THREADHELP_GATE_HXX_
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//_________________________________________________________________________________________________________________
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// my own includes
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//_________________________________________________________________________________________________________________
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#include <threadhelp/inoncopyable.h>
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#include <threadhelp/igate.h>
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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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#include <osl/mutex.hxx>
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#include <osl/conditn.hxx>
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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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// declarations
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//_________________________________________________________________________________________________________________
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/*-************************************************************************************************************//**
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@short implement a gate to block multiple threads at same time or unblock all
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@descr A gate can be used as a negative-condition! You can open a "door" - wait() will not block ...
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or you can close it - wait() blocks till open() is called again.
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As a special feature you can open the gate a little bit by sing openGap().
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Then all currently waiting threads are running immediately - but new ones are blocked!
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@attention To prevent us against wrong using, the default ctor, copy ctor and the =operator are maked private!
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@implements IGate
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@base IGate
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INonCopyable
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@devstatus ready to use
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*//*-*************************************************************************************************************/
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class Gate : public IGate
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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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@short ctor
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@descr These initialize the object right as an open gate.
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@seealso -
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@param -
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@return -
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@onerror -
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*//*-*****************************************************************************************************/
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inline Gate()
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: m_bClosed ( sal_False )
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, m_bGapOpen ( sal_False )
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{
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open();
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}
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/*-****************************************************************************************************//**
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@short dtor
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@descr Is user forget it - we open the gate ...
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blocked threads can running ... but I don't know
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if it's right - we are destroyed yet!?
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@seealso -
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@param -
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@return -
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@onerror -
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*//*-*****************************************************************************************************/
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inline virtual ~Gate()
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{
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open();
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}
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/*-****************************************************************************************************//**
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@interface IGate
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@short open the gate
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@descr A wait() call will not block then.
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@seealso method close()
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@param -
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@return -
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@onerror -
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*//*-*****************************************************************************************************/
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inline virtual void open()
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{
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// We must safe access to our internal member!
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::osl::MutexGuard aLock( m_aAccessLock );
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// Set condition -> wait don't block any longer -> gate is open
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m_aPassage.set();
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// Check if operation was successful!
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// Check returns false if condition isn't set => m_bClosed will be true then => we must return false; opening failed
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m_bClosed = ( m_aPassage.check() == sal_False );
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}
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/*-****************************************************************************************************//**
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@interface IGate
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@short close the gate
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@descr A wait() call will block then.
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@seealso method open()
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@param -
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@return -
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@onerror -
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*//*-*****************************************************************************************************/
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inline virtual void close()
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{
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// We must safe access to our internal member!
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::osl::MutexGuard aLock( m_aAccessLock );
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// Reset condition -> wait blocks now -> gate is closed
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m_aPassage.reset();
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// Check if operation was successful!
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// Check returns false if condition was reseted => m_bClosed will be true then => we can return true; closing ok
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m_bClosed = ( m_aPassage.check() == sal_False );
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}
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/*-****************************************************************************************************//**
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@interface IGate
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@short open gate for current waiting threads
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@descr All current waiting threads stand in wait() at line "m_aPassage.wait()" ...
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With this call you can open the passage for these waiting ones.
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The "gap" is closed by any new thread which call wait() automaticly!
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@seealso method wait()
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@seealso method open()
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@param -
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@return -
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@onerror -
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*//*-*****************************************************************************************************/
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inline virtual void openGap()
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{
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// We must safe access to our internal member!
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::osl::MutexGuard aLock( m_aAccessLock );
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// Open passage for current waiting threads.
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m_aPassage.set();
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// Check state of condition.
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// If condition is set check() returns true => m_bGapOpen will be true too => we can use it as return value.
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m_bGapOpen = ( m_aPassage.check() == sal_True );
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}
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/*-****************************************************************************************************//**
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@interface IGate
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@short must be called to pass the gate
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@descr If gate "open" => wait() will not block.
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If gate "closed" => wait() will block till somewhere open it again.
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If gap "open" => currently waiting threads unblocked, new ones blocked
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@seealso method wait()
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@seealso method open()
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@param "pTimeOut", optional parameter to wait a certain time
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@return true, if wait was successful (gate was opened)
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false, if condition has an error or timeout was reached!
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@onerror We return false.
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*//*-*****************************************************************************************************/
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inline virtual sal_Bool wait( const TimeValue* pTimeOut = NULL )
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{
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// We must safe access to our internal member!
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::osl::ClearableMutexGuard aLock( m_aAccessLock );
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// If gate not closed - caller can pass it.
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sal_Bool bSuccessful = sal_True;
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if( m_bClosed == sal_True )
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{
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// Otherwise first new thread must close an open gap!
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if( m_bGapOpen == sal_True )
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{
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m_bGapOpen = sal_False;
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m_aPassage.reset();
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}
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// Then we must release used access lock -
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// because next call will block ...
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// and if we hold the access lock nobody else can use this object without a dadlock!
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aLock.clear();
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// Wait for opening gate ...
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bSuccessful = ( m_aPassage.wait( pTimeOut ) == ::osl::Condition::result_ok );
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}
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return bSuccessful;
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}
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//-------------------------------------------------------------------------------------------------------------
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// private member
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//-------------------------------------------------------------------------------------------------------------
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private:
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::osl::Mutex m_aAccessLock ;
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::osl::Condition m_aPassage ;
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sal_Bool m_bClosed ;
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sal_Bool m_bGapOpen ;
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}; // class Gate
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} // namespace framework
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#endif // #ifndef __FRAMEWORK_THREADHELP_GATE_HXX_
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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