pending tasks in loop

[benoitc]

It seems that active_handlers only return the number of active handlers at a a time but not return the real number of pending tasks. For example I can have one pending ticker not showing as active; should I reference all the loop tasks unsing ref() ?

[saghul]

active_handles is a libuv internal thing which shouldn't be in pyuv, so I'll probably remove it for 0.9.0, so don't rely on it.

loop.run() will return when no handle is holding a reference to it. Handles hold a reference to the loop when they are active, but you can unref() a handle after you start it if you don't want it to keep the loop alive.

I guess that you are dealing with the "how do I stop the loop" problem then. You can use loop.walk and close all handles, for example:

def cb(handle):
    if not handle.closed:
        handle.close()
loop.walk(cb)

Hope this helps.

[benoitc]

mm I have a heartbeat running in background to make sure the loop event handler is part of the tasks. Not sure in this case how I can do.If I unref it most probably the loop will close if no other handle is running I guess

[saghul]

Exactly. If you don't want the heartbeat to keep the loop alive unref() it after you start it. I usually do this for Signal handles, for example.

[benoitc]

OK thanks. This is finally what I do in flower:

benoitc/flower@294ed5a

The loop task will run until no pending events exists. A timer make sure that the loop let other tasks running.

[benoitc]

ok figured it. Closing the issue. Thanks for your answer.