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#include <QtGui/QApplication>
#include "threada.h"
#include <QDebug>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	qDebug()<<"START ============================";

	qDebug()<<"Main Thread ID: "<<a.thread()->currentThreadId();
	ThreadB threadB;
	ThreadA threadA(&threadB);

	return a.exec();
}

#ifndef THREADA_H
#define THREADA_H

#include <QThread>
#include "threadb.h"

class ThreadA : public QThread
{
	Q_OBJECT

public:
	ThreadA(ThreadB*);
void run();

private:
	ThreadB *threadB;
};

#endif // THREADA_H

#include "threada.h"
#include <QDebug>

ThreadA::ThreadA(ThreadB *thB)
	: QThread()
{
	threadB=thB;
	moveToThread(this);
	start(); 
}

void ThreadA::run()
{
	QByteArray dataToSend="HELLO WORLD!";
	qDebug()<<"functionSendData("+dataToSend+") From "<<currentThreadId();
	threadB->functionSendData(dataToSend);
	//exec();
}

#ifndef THREADB_H
#define THREADB_H

#include <QThread>

class ThreadB : public QThread
{
	Q_OBJECT

public:
	ThreadB();

	void functionSendData(QByteArray);

private slots:
	void slotSendData(QByteArray);
signals:
	void signalSendData(QByteArray);
};

#endif // THREADB_H

#include "threadb.h"
#include <QDebug>
#include <QCoreApplication>

ThreadB::ThreadB()
	: QThread()
{
	connect(this,SIGNAL(signalSendData(QByteArray)),this,SLOT(slotSendData(QByteArray)));
	moveToThread(this);
	start();
}

void ThreadB::slotSendData(QByteArray data)
{
	//чтото делать с данными
	qDebug()<<"slotSendData("+data+") From "<<currentThreadId();
	qDebug()<<"END ============================";
	QCoreApplication::quit();
}

void ThreadB::functionSendData(QByteArray data)
{
	qDebug()<<"signalSendData("+data+") From "<<currentThreadId();
	emit signalSendData(data);
}

Main Thread ID: 0x1af4 
functionSendData(HELLO WORLD!) From 0x1f6c 
signalSendData(HELLO WORLD!) From 0x1f6c
slotSendData(HELLO WORLD!) From 0x1e34