OpenWalnut 1.2.5

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     // win crashes here sometimes
00037 #ifndef _MSC_VER
00038     // cleanup
00039     try
00040     {
00041         m_lock.unlock();
00042     }
00043     catch( const boost::lock_error &e )
00044     {
00045         // ignore this particular error since it is thrown when the lock is not locked anymore
00046     }
00047 #endif
00048 }
00049 
00050 void WConditionOneShot::wait() const
00051 {
00052     // now we wait until the write lock is released and we can get a read lock
00053     boost::shared_lock<boost::shared_mutex> slock = boost::shared_lock<boost::shared_mutex>( m_mutex );
00054     slock.unlock();
00055 }
00056 
00057 void WConditionOneShot::notify()
00058 {
00059     try
00060     {
00061         m_lock.unlock();
00062     }
00063     catch( const boost::lock_error &e )
00064     {
00065         // ignore this particular error since it is thrown when the lock is not locked anymore
00066         // because the notify was called multiple times
00067     }
00068 
00069     WCondition::notify();
00070 }
00071 
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