Hi,
Attached is a simple testcase which emits a signal from a worker thread, and
then waits until the main thread has released a database connection.
It works fine under Linux, but under OSX Qt 4.7RC, PyQt 4.7.4, the slot never
get's called, i.e. print "slot called" never gets executed.
From Googling around I know that putting the main thread to sleep with a
QWaitCondition also puts the event loop to sleep. However, here we don't put
the main thread to sleep, but only the worker thread, and only after we emit
the signal.
What then is the reason that the slot never gets called on OSX?
Cheers,
Peter
import os
import sys
import select
import socket
from PyQt4 import QtCore, QtGui
mutex = QtCore.QMutex()
database_released = QtCore.QWaitCondition()
class ServerThread(QtCore.QThread):
sync_started_signal = QtCore.pyqtSignal()
def __init__(self):
QtCore.QThread.__init__(self)
self.server_has_connection = False
def run(self):
mutex.lock()
print "emitting signal..."
self.sync_started_signal.emit()
print "waiting for main thread..."
if not self.server_has_connection:
database_released.wait(mutex)
print "OK!"
mutex.unlock()
class QtSyncServer(QtCore.QObject):
def __init__(self):
self.thread = ServerThread()
self.thread.sync_started_signal.connect(\
self.unload_database)
self.thread.start()
def unload_database(self):
print "slot called"
mutex.lock()
if not self.thread.server_has_connection:
self.thread.server_has_connection = True
database_released.wakeAll()
mutex.unlock()
app = QtGui.QApplication(sys.argv)
widget = QtGui.QWidget()
widget.resize(250, 150)
widget.setWindowTitle('simple')
widget.show()
q = QtSyncServer()
app.exec_()
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