qt - Advanced Python Scheduler BlockingScheduler not playing well with QtCore.SIGNAL in PyQt -

i have discovered interesting behaviour don't understand , wondering if has idea going on.

i developing program using pyqt4 , require data received rs485 interface updated every second

to achieve accurately, using advanced python scheduler's (aps) blockingscheduler schedule task every second.

the problem running signals emit main thread not received @ when blockingscheduler used, when use qtcore.qcoreapplication.processevents().

i don't quite understand because if have blocking loop in worker thread example:

while(true):     print('this loop never ends')     qtcore.qcoreapplication.processevents() 

all signals thread processed after print statement made. seems blockingscheduler not exhibit same behaviour this.

i have tried using backgroundscheduler , problem implementation backgroundscheduler seems have different event loop thread called from. results in clashes in communications hardware since there 2 execution loops fighting 1 serial bus.

my code looks this

class main_window():      # ui stuff goes here      def go(self):         # signal sent here         self.emit(signal('do_something'))  class worker1(qtcore.qobject):     def __init__(self):         ...      def go_pressed(self):         self.sched = blockingscheduler()         self.sched.add_job(self.start_monitoring, 'interval', seconds = 1, next_run_time = datetime.now())          self.sched.start()       def start_monitoring(self):         # data grabbing stuff here         qtcore.qcoreapplication.processevents()      def do_something(self):         # signal received here...         #  # create our application app = qtgui.qapplication(sys.argv) myapp = main_window() myapp.show()  # create qthread , qobject our worker worker = worker1()  thr = qtcore.qthread()   # move our object new thread worker.movetothread(thr)  app.connect(myapp,signal('do_something'),worker.do_something) 

so question is:

1) how make blockingscheduler see external signals

2) how make signals wait completion of task scheduled backgroundscheduler?

3) there better way schedule tasks every second without of being issue?