annotate base/Serialiser.cpp @ 735:66c3f4e060e9

Merge
author Chris Cannam
date Wed, 23 May 2012 17:17:17 +0100
parents d095214ffbaf
children 14c776dad920
rev   line source
Chris@297 1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
Chris@297 2
Chris@297 3 /*
Chris@297 4 Sonic Visualiser
Chris@297 5 An audio file viewer and annotation editor.
Chris@297 6 Centre for Digital Music, Queen Mary, University of London.
Chris@297 7 This file copyright 2007 QMUL.
Chris@297 8
Chris@297 9 This program is free software; you can redistribute it and/or
Chris@297 10 modify it under the terms of the GNU General Public License as
Chris@297 11 published by the Free Software Foundation; either version 2 of the
Chris@297 12 License, or (at your option) any later version. See the file
Chris@297 13 COPYING included with this distribution for more information.
Chris@297 14 */
Chris@297 15
Chris@297 16 #include "Serialiser.h"
Chris@297 17
Chris@406 18 #include <iostream>
Chris@406 19
Chris@297 20 QMutex
Chris@297 21 Serialiser::m_mapMutex;
Chris@297 22
Chris@297 23 std::map<QString, QMutex *>
Chris@297 24 Serialiser::m_mutexMap;
Chris@297 25
Chris@297 26 Serialiser::Serialiser(QString id) :
Chris@297 27 m_id(id)
Chris@297 28 {
Chris@297 29 m_mapMutex.lock();
Chris@297 30
Chris@297 31 if (m_mutexMap.find(m_id) == m_mutexMap.end()) {
Chris@297 32 m_mutexMap[m_id] = new QMutex;
Chris@297 33 }
Chris@297 34
Chris@406 35 // The id mutexes are never deleted, so once we have a reference
Chris@406 36 // to the one we need, we can hold on to it while we release the
Chris@406 37 // map mutex. We need to release the map mutex, otherwise if the
Chris@406 38 // id mutex is currently held, it will never be released (because
Chris@406 39 // the destructor needs to hold the map mutex to release the id
Chris@406 40 // mutex).
Chris@406 41
Chris@406 42 QMutex *idMutex = m_mutexMap[m_id];
Chris@398 43
Chris@297 44 m_mapMutex.unlock();
Chris@406 45
Chris@406 46 idMutex->lock();
Chris@297 47 }
Chris@297 48
Chris@297 49 Serialiser::~Serialiser()
Chris@297 50 {
Chris@398 51 m_mapMutex.lock();
Chris@398 52
Chris@297 53 m_mutexMap[m_id]->unlock();
Chris@398 54
Chris@398 55 m_mapMutex.unlock();
Chris@297 56 }
Chris@297 57
Chris@297 58
Chris@297 59