OpenWalnut  1.4.0
WConditionOneShot.cpp
00001 //---------------------------------------------------------------------------
00002 //
00003 // Project: OpenWalnut ( http://www.openwalnut.org )
00004 //
00005 // Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS
00006 // For more information see http://www.openwalnut.org/copying
00007 //
00008 // This file is part of OpenWalnut.
00009 //
00010 // OpenWalnut is free software: you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as published by
00012 // the Free Software Foundation, either version 3 of the License, or
00013 // (at your option) any later version.
00014 //
00015 // OpenWalnut is distributed in the hope that it will be useful,
00016 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00018 // GNU Lesser General Public License for more details.
00019 //
00020 // You should have received a copy of the GNU Lesser General Public License
00021 // along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>.
00022 //
00023 //---------------------------------------------------------------------------
00024 
00025 #include "WConditionOneShot.h"
00026 
00027 WConditionOneShot::WConditionOneShot()
00028     : WCondition()
00029 {
00030     // initialize members
00031     m_lock = boost::unique_lock<boost::shared_mutex>( m_mutex );
00032 }
00033 
00034 WConditionOneShot::~WConditionOneShot()
00035 {
00036     // cleanup
00037     try
00038     {
00039         m_lock.unlock();
00040     }
00041     catch( const boost::lock_error &e )
00042     {
00043         // ignore this particular error since it is thrown when the lock is not locked anymore
00044     }
00045 }
00046 
00047 void WConditionOneShot::wait() const
00048 {
00049     // now we wait until the write lock is released and we can get a read lock
00050     boost::shared_lock<boost::shared_mutex> slock = boost::shared_lock<boost::shared_mutex>( m_mutex );
00051     slock.unlock();
00052 }
00053 
00054 void WConditionOneShot::notify()
00055 {
00056     try
00057     {
00058         m_lock.unlock();
00059     }
00060     catch( const boost::lock_error &e )
00061     {
00062         // ignore this particular error since it is thrown when the lock is not locked anymore
00063         // because the notify was called multiple times
00064     }
00065 
00066     WCondition::notify();
00067 }
00068