do control return back returning to previous slot/function from where signal generate

[wysota]

I can only suggest that you use a wait condition to stop the emiting thread and release it from a slot. It's still a bad design though, because you may experience unwanted behaviour when two objects are connected to that signal.

QMutex m;
QWaitCondition wcond;
connect(thread, SIGNAL(someSignal()), someother, SLOT(someSlot()));
//...
void MyThread::someMethod(){
  m.lock();
  emit someSignal();
  wcond.wait(&m);
  m.unlock();
}
//...
void OtherClass::someSlot(){
  doSomething();
  wcond.wakeAll();
}

QMutex m;
QWaitCondition wcond;
connect(thread, SIGNAL(someSignal()), someother, SLOT(someSlot()));
//...
void MyThread::someMethod(){
  m.lock();
  emit someSignal();
  wcond.wait(&m);
  m.unlock();
}
//...
void OtherClass::someSlot(){
  doSomething();
  wcond.wakeAll();
}

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I don't know what will happen if the slot will be called immediately after emit someSignal(), before wcond.wait() -- you might end up in a deadlock. You might want to take a look at QWaitCondition docs to see how to avoid it.