[ros-users] rospy.sleep() blocking callbacks

[Ken Conley]

You probably shouldn't call sleep inside of a click callback -- this
applies to any form of sleep, not just rospy. I haven't used
Python/Tk, but, in general, sleeping event callbacks in GUI apps leads
to all sorts of bad problems.

 - Ken

On Tue, Jul 6, 2010 at 3:05 PM, Dan Lazewatsky <dlaz at cse.wustl.edu> wrote:
> I'm writing on a GUI in Python/Tk - I have a subscriber which is
> listening for image messages and setting a class member variable with
> the newest image, and a GUI element that needs to use image (after
> sending a message to move a pan/tilt). On click I use rospy.sleep() to
> wait for the pan/tilt to settle down before using any images. However,
> I've noticed that once I call rospy.sleep() inside the click callback,
> the callback for the image subscriber stops getting called. It was my
> understanding that subscriber callbacks are run asynchronously in
> their own thread, so a sleep in a different thread should have no
> effect. What's going on here? What am I missing?
>
> Thanks,
> -Dan
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