why doesn't signal gets emiited?

[naturalpsychic]

i dont understand why are my signals not working in this multi threaded app

file.h:

#include <QObject>
 
 
class FThread;
 
class File : public QObject
{
    Q_OBJECT
public:
    File(QObject *parent = 0);
    FThread *fthread;
public slots:
    void print();
 
 
 
};

#include <QObject>


class FThread;

class File : public QObject
{
    Q_OBJECT
public:
    File(QObject *parent = 0);
    FThread *fthread;
public slots:
    void print();



};

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fthread.h

#include <QThread>
 
 
class File;
class FThread : public QThread
{
    Q_OBJECT
public:
 
 
    FThread(QObject *parent = 0);
    virtual void run();
    File *f;
    void sampleFunc();
signals:
    void done();
 
 
};

#include <QThread>


class File;
class FThread : public QThread
{
    Q_OBJECT
public:


    FThread(QObject *parent = 0);
    virtual void run();
    File *f;
    void sampleFunc();
signals:
    void done();


};

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file.cpp:

#include "file.h"
#include <QDebug>
#include "fthread.h"
 
File::File(QObject *parent) :
    QObject(parent)
{
 
    connect(fthread,SIGNAL(done()),this,SLOT(print()));
 
}
void File::print(){
    qDebug()<<"printing from File object";
    fthread.exit();
}

#include "file.h"
#include <QDebug>
#include "fthread.h"

File::File(QObject *parent) :
    QObject(parent)
{

    connect(fthread,SIGNAL(done()),this,SLOT(print()));

}
void File::print(){
    qDebug()<<"printing from File object";
    fthread.exit();
}

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fthread.cpp

#include "fthread.h"
#include "file.h"
#include <QDebug>
 
FThread::FThread(QObject *parent) :
    QThread(parent)
{
 
    f=new File();
 
 
}
 
void FThread::run(){
 
    sampleFunc();      
    this->exec();
 
}
 
void FThread::sampleFunc()
{
         emit done();   //<<--------------SIGNAL SHOULD BE EMITTED FROM HERE
}

#include "fthread.h"
#include "file.h"
#include <QDebug>

FThread::FThread(QObject *parent) :
    QThread(parent)
{

    f=new File();


}

void FThread::run(){

    sampleFunc();      
    this->exec();

}

void FThread::sampleFunc()
{
         emit done();   //<<--------------SIGNAL SHOULD BE EMITTED FROM HERE
}

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main.cpp:

#include <QtCore/QCoreApplication>
#include <QDebug>
#include "fthread.h"
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    qDebug()<<"App started";
FThread fthread;
fthread.start();
fthread.wait();
    return a.exec();
}

#include <QtCore/QCoreApplication>
#include <QDebug>
#include "fthread.h"
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    qDebug()<<"App started";
FThread fthread;
fthread.start();
fthread.wait();
    return a.exec();
}

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NOTE:

i get following output:

App started
The program has unexpectedly finished.
...path/Thread exited with code 0

means it is exiting without error


any help please!!!!!!!