OpenWalnut  1.4.0
WConditionOneShot.cpp
1 //---------------------------------------------------------------------------
2 //
3 // Project: OpenWalnut ( http://www.openwalnut.org )
4 //
5 // Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS
6 // For more information see http://www.openwalnut.org/copying
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8 // This file is part of OpenWalnut.
9 //
10 // OpenWalnut is free software: you can redistribute it and/or modify
11 // it under the terms of the GNU Lesser General Public License as published by
12 // the Free Software Foundation, either version 3 of the License, or
13 // (at your option) any later version.
14 //
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18 // GNU Lesser General Public License for more details.
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21 // along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>.
22 //
23 //---------------------------------------------------------------------------
24 
25 #include "WConditionOneShot.h"
26 
28  : WCondition()
29 {
30  // initialize members
31  m_lock = boost::unique_lock<boost::shared_mutex>( m_mutex );
32 }
33 
35 {
36  // cleanup
37  try
38  {
39  m_lock.unlock();
40  }
41  catch( const boost::lock_error &e )
42  {
43  // ignore this particular error since it is thrown when the lock is not locked anymore
44  }
45 }
46 
48 {
49  // now we wait until the write lock is released and we can get a read lock
50  boost::shared_lock<boost::shared_mutex> slock = boost::shared_lock<boost::shared_mutex>( m_mutex );
51  slock.unlock();
52 }
53 
55 {
56  try
57  {
58  m_lock.unlock();
59  }
60  catch( const boost::lock_error &e )
61  {
62  // ignore this particular error since it is thrown when the lock is not locked anymore
63  // because the notify was called multiple times
64  }
65 
67 }
68 
boost::shared_mutex m_mutex
The mutex used for the condition.
Definition: WCondition.h:106
virtual void notify()
Notifies all waiting threads.
boost::unique_lock< boost::shared_mutex > m_lock
Locked as long the condition was not fired.
WConditionOneShot()
Default constructor.
Class to encapsulate boost::condition_variable_any.
Definition: WCondition.h:39
virtual void notify()
Notifies all waiting threads.
Definition: WCondition.cpp:44
virtual ~WConditionOneShot()
Destructor.
virtual void wait() const
Wait for the condition.