Right now I have a thread that sleeps for sometime and check if an
event has happened and go back to sleep. Now instead I want the thread
to sleep until the event has occured process the event and go back to sleep
class eventhndler(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
def run(self):
while True:
time.sleep(SLEEPTIME)
''''do event stuff'''
The way i would do this is by using an threading.Event (
http://docs.python.org/lib/event-objects.html)
<code>
class eventhandler(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.event = threading.Event()
def run:
while True:
# block until some event happens
self.event.wait()
""" do stuff here """
self.event.clear()
</code>
the way to use this is to get the main/separate thread to set() the
event object.
Can you give an example of how to get the main threead to set teh event object?
this is exactly what i wanted to do!
thanks a lot!
mark>
oops I've miss-typed the thread variable name the following should
work
<code>
if __name__ == "__main__":
evtHandlerThread = eventhandler()
evtHandlerThread.start()
# do something here #
evtHandlerThread.event.set()
# do more stuff here #
evtHandlerThread.event.set()
</code>
Can I have the same thread process two or more events? Can you tell
how to do this? The code you gave is waiting on one event right. How
can I do it for more events?
thanks a lot!
mark
I don't think a thread can block on more than one event at a time. But
you can make it block on more then one event one at a time.
<code>
class eventhandler(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.events = [threading.Event(), threading.Event()]
self.currentEvent = None
def run:
while True:
for event in self.events:
self.currentEvent = event
# block until some event happens
self.currentEvent.wait()
""" do stuff here """
self.currentEvent.clear()
if __name__ == "__main__":
evtHandlerThread = eventhandler()
evtHandlerThread.start()
# do something here #
evtHandlerThread.currentEvent.set()
# do more stuff here #
evtHandlerThread.currentEvent.set()
</code>
what the thread does is sequentially waits for two events to happen
and then execute the same code. You could change this code to perform
different functions for different event objects.
Once the thread starts it is going to wait on the event that is the
first element of the list right? This would mean :