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#include "thread.h"

/*
 * QThread derived class with additional capability to move a QObject to the
 * new thread, to stop the thread and move the QObject back to the thread where
 *it came from. 
 */

Thread::Thread( QObject *parent)
    : QThread (parent)
{
    //we need a class that receives signals from other threads and emits a signal in response
    shutDownHelper=new QSignalMapper;
    shutDownHelper->setMapping(this,0);
    connect(this, SIGNAL(started()), this, SLOT(setReadyStatus() ), Qt::DirectConnection);
    connect(this, SIGNAL(aboutToStop()), shutDownHelper, SLOT(map()) );
}

//------------------------------------------------------
Thread::~Thread()
{
    delete shutDownHelper;
}

//------------------------------------------------------
// starts thread, moves worker to this thread and blocks
void Thread::launchWorker(QObject *worker)
{
    worker = worker;
    start();
    int i=0;
    worker->moveToThread(this);
    shutDownHelper->moveToThread(this);
    connect(shutDownHelper, SIGNAL(mapped(int) ), this, SLOT(stopExecutor()), Qt::DirectConnection );
    mutex.lock();
    waitCondition.wait(&mutex);
}

//------------------------------------------------------
// puts a command to stop processing in the event queue of worker thread
void Thread::stop()
{
    emit aboutToStop();
}

//------------------------------------------------------

// methods above this line should be called in  gui thread context
// methods below this line are private and will be run in  secondary thread context

//------------------------------------------------------
void Thread::stopExecutor()  //secondary thread context
{
    exit();
}

//------------------------------------------------------
void Thread::setReadyStatus()
{
    waitCondition.wakeAll();
}
