MythTV: referencecounter.cpp Source File

00001 // -*- Mode: c++ -*-
00002 
00003 #include <QString>
00004 #include <QMutexLocker>
00005 #include "referencecounter.h"
00006 #include "mythlogging.h"
00007 
00008 ReferenceCounter::ReferenceCounter(void) :
00009     m_refCount(1)
00010 {
00011 }
00012 
00013 void ReferenceCounter::UpRef(void)
00014 {
00015     QMutexLocker mlock(&m_refLock);
00016     m_refCount++;
00017     LOG(VB_REFCOUNT, LOG_DEBUG, QString("%1(0x%2)::UpRef() -> %3")
00018                     .arg(metaObject()->className())
00019                     .arg((uint64_t)this,0,16)
00020                     .arg(QString::number(m_refCount)));
00021 }
00022 
00023 bool ReferenceCounter::DownRef(void)
00024 {
00025     m_refLock.lock();
00026     m_refCount--;
00027     LOG(VB_REFCOUNT, LOG_DEBUG, QString("%1(0x%2)::DownRef() -> %3")
00028                     .arg(metaObject()->className())
00029                     .arg((uint64_t)this,0,16)
00030                     .arg(QString::number(m_refCount)));
00031 
00032     if (m_refCount == 0)
00033     {
00034         m_refLock.unlock();
00035         delete this;
00036         return true;
00037     }
00038 
00039     m_refLock.unlock();
00040     return false;
00041 }
00042 
00043 ReferenceLocker::ReferenceLocker(ReferenceCounter *counter, bool upref) :
00044     m_refObject(counter)
00045 {
00046     if (upref)
00047         m_refObject->UpRef();
00048 }
00049 
00050 ReferenceLocker::~ReferenceLocker(void)
00051 {
00052     m_refObject->DownRef();
00053     m_refObject = NULL;
00054 }