svcore
1.9
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00001 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ 00002 00003 /* 00004 Sonic Visualiser 00005 An audio file viewer and annotation editor. 00006 Centre for Digital Music, Queen Mary, University of London. 00007 This file copyright 2007 QMUL. 00008 00009 This program is free software; you can redistribute it and/or 00010 modify it under the terms of the GNU General Public License as 00011 published by the Free Software Foundation; either version 2 of the 00012 License, or (at your option) any later version. See the file 00013 COPYING included with this distribution for more information. 00014 */ 00015 00016 #include "Serialiser.h" 00017 00018 #include <iostream> 00019 00020 QMutex 00021 Serialiser::m_mapMutex; 00022 00023 std::map<QString, QMutex *> 00024 Serialiser::m_mutexMap; 00025 00026 Serialiser::Serialiser(QString id) : 00027 m_id(id) 00028 { 00029 m_mapMutex.lock(); 00030 00031 if (m_mutexMap.find(m_id) == m_mutexMap.end()) { 00032 m_mutexMap[m_id] = new QMutex; 00033 } 00034 00035 // The id mutexes are never deleted, so once we have a reference 00036 // to the one we need, we can hold on to it while we release the 00037 // map mutex. We need to release the map mutex, otherwise if the 00038 // id mutex is currently held, it will never be released (because 00039 // the destructor needs to hold the map mutex to release the id 00040 // mutex). 00041 00042 QMutex *idMutex = m_mutexMap[m_id]; 00043 00044 m_mapMutex.unlock(); 00045 00046 idMutex->lock(); 00047 } 00048 00049 Serialiser::~Serialiser() 00050 { 00051 m_mapMutex.lock(); 00052 00053 m_mutexMap[m_id]->unlock(); 00054 00055 m_mapMutex.unlock(); 00056 } 00057 00058 00059