Thread-to-thread signals not working

[Ruuttu]

Signals are not getting through if sender and receiver are in different threads.

import time
from PySide.QtCore import *
from PySide.QtGui import *

class NoiseMaker(QObject):
	noise = Signal(int)
	def work(self):
		while True:
			print "Making some noise"
			self.noise.emit( 100 )
			time.sleep(0.5)
			
class Listener(QObject):
	def work(self):
		while True:
			time.sleep(0.5)
			
	def receiveNoise(self, integer):
		print "Got some noise"
		
class App(QApplication):
	def __init__(self):
		super( App, self ).__init__([])
		
		# Create workers
		self.noiseMaker = NoiseMaker()
		self.listener = Listener()
		
		# Create threads
		self.noiseMakerThread = QThread()
		self.listenerThread = QThread()
		
		# Move workers to threads
		self.noiseMaker.moveToThread( self.noiseMakerThread )
		self.listener.moveToThread( self.listenerThread )
		
		# NoiseMaker emits to Listener
		self.noiseMaker.noise.connect( self.listener.receiveNoise )
		
		# Start noise thread
		self.noiseMakerThread.started.connect( self.noiseMaker.work )
		self.noiseMakerThread.start()
		
		# Start listener thread
		self.listenerThread.started.connect( self.listener.work )
		self.listenerThread.start()
		
	
App().exec_()

Expected output:
Making some noise
Got some noise

Actual output:
Making some noise

However:
If you comment out these lines the example works:

		self.noiseMaker.moveToThread( self.noiseMakerThread )
		self.listener.moveToThread( self.listenerThread )

Alternatively, if you move both workers to the same thread, that also works:

		self.noiseMaker.moveToThread( self.noiseMakerThread )
		self.listener.moveToThread( self.noiseMakerThread )