getting a thread out of sleep

[mark]

On 21 Feb 2007 14:47:50 -0800, placid <Bulkan at gmail.com> wrote:
> On Feb 22, 3:23 am, mark <rkmr... at gmail.com> wrote:
> > On 20 Feb 2007 21:26:18 -0800, placid <Bul... at gmail.com> wrote:
> >
> >
> >
> > > On Feb 21, 4:21 pm, "placid" <Bul... at gmail.com> wrote:
> > > > On Feb 21, 4:12 pm, mark <rkmr... at gmail.com> wrote:
> > > > > On 20 Feb 2007 20:47:57 -0800, placid <Bul... at gmail.com> wrote:
> > > > > > On Feb 21, 3:08 pm, mark <rkmr... at gmail.com> wrote:
> > > > > > > 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 :
evtHandlerThread.currentEvent.set(): that I have only one event right?
Can you explain how I can have different event objects. I dont see how
I can do different functinos for same event.

Thanks a lot!

mark