jack2/common/JackThreadedDriver.cpp

/*
 Copyright (C) 2001 Paul Davis
 Copyright (C) 2004-2008 Grame

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif

#ifdef WIN32
#pragma warning (disable : 4786)
#endif

#include "JackThreadedDriver.h"
#include "JackError.h"
#include "JackGlobals.h"
#include "JackClient.h"
#include "JackEngineControl.h"
#include "JackException.h"

namespace Jack
{

JackThreadedDriver::JackThreadedDriver(JackDriverClient* driver):fThread(this)
{
    fDriver = driver;
}

JackThreadedDriver::~JackThreadedDriver()
{
    delete fDriver;
}

int JackThreadedDriver::Start()
{
    jack_log("JackThreadedDriver::Start");

    if (fDriver->Start() < 0) {
        jack_error("Cannot start driver");
        return -1;
    }
    if (fThread.Start() < 0) {
        jack_error("Cannot start thread");
        return -1;
    }

    return 0;
}

int JackThreadedDriver::Stop()
{
    jack_log("JackThreadedDriver::Stop");
    
    switch (fThread.GetStatus()) {
            
        // Kill the thread in Init phase
        case JackThread::kStarting:
        case JackThread::kIniting:
            if (fThread.Kill() < 0) {
                jack_error("Cannot kill thread");
                return -1;
            }
            break;
           
        // Stop when the thread cycle is finished
        case JackThread::kRunning:
            if (fThread.Stop() < 0) {
                jack_error("Cannot stop thread"); 
                return -1;
            }
            break;
            
        default:
            break;
    }

    if (fDriver->Stop() < 0) {
        jack_error("Cannot stop driver");
        return -1;
    }
    return 0;
}

bool JackThreadedDriver::Execute()
{
    return (Process() == 0);
}

bool JackThreadedDriver::Init()
{
    if (fDriver->Init())  {
        if (fDriver->IsRealTime()) {
            jack_log("JackThreadedDriver::Init IsRealTime");
            // Will do "something" on OSX only...
            fThread.SetParams(GetEngineControl()->fPeriod, GetEngineControl()->fComputation, GetEngineControl()->fConstraint);
            if (fThread.AcquireRealTime(GetEngineControl()->fPriority) < 0)
                jack_error("AcquireRealTime error");
        }
        return true;
    } else {
        return false;
    }
}

bool JackRestartThreadedDriver::Execute()
{
    try {
        // Keep running even in case of error
        while (fThread.GetStatus() == JackThread::kRunning) {
            Process();
        }
    } catch (JackDriverException e) {
        e.PrintMessage();
        jack_log("Driver is restarted");
        fThread.SetStatus(JackThread::kIniting);
        fThread.DropRealTime();
        return Init();
    }
    return false;
}

} // end of namespace