MythTV: mythsignalingtimer.cpp Source File

00001 /* -*- Mode: c++ -*-
00002  *
00003  *   Copyright (C) 2010 Jim Stichnoth, Daniel Kristjansson
00004  *
00005  *   This program is free software; you can redistribute it and/or modify
00006  *   it under the terms of the GNU General Public License as published by
00007  *   the Free Software Foundation; either version 2 of the License, or
00008  *   (at your option) any later version.
00009  *
00010  *   This program is distributed in the hope that it will be useful,
00011  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *   GNU General Public License for more details.
00014  *
00015  *   You should have received a copy of the GNU General Public License
00016  *   along with this program; if not, write to the Free Software
00017  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00018  */
00019 
00020 #include "mythsignalingtimer.h"
00021 #include "mythlogging.h"
00022 
00023 MythSignalingTimer::MythSignalingTimer(
00024     QObject *parent, const char *slot) :
00025     QObject(parent), MThread("SignalingTimer"),
00026     dorun(false), running(false), microsec(0)
00027 {
00028     connect(this, SIGNAL(timeout()), parent, slot,
00029             Qt::QueuedConnection);
00030 }
00031 
00032 MythSignalingTimer::~MythSignalingTimer()
00033 {
00034     stop();
00035     wait();
00036 }
00037 
00038 void MythSignalingTimer::start(int msec)
00039 {
00040     if (msec <= 0)
00041         return;
00042 
00043     microsec = 1000 * msec;
00044 
00045     QMutexLocker locker(&startStopLock);
00046     if (!running)
00047     {
00048         dorun = true;
00049         MThread::start();
00050         while (dorun && !running)
00051             usleep(10 * 1000);
00052     }
00053 }
00054 
00055 void MythSignalingTimer::stop(void)
00056 {
00057     if (is_current_thread(this))
00058     {
00059         dorun = false;
00060         return;
00061     }
00062 
00063     QMutexLocker locker(&startStopLock);
00064     if (running)
00065     {
00066         dorun = false;
00067         wait();
00068     }
00069 }
00070 
00071 void MythSignalingTimer::run(void)
00072 {
00073     running = true;
00074     RunProlog();
00075     while (dorun)
00076     {
00077         usleep(microsec);
00078         if (dorun)
00079             emit timeout();
00080     }
00081     RunEpilog();
00082     running = false;
00083 }