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Threading: execute a callback function in the parent thread

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  Threading: execute a callback function in the parent thread massi_srb@msn.com - 2015-03-20 10:29 -0700
    Re: Threading: execute a callback function in the parent thread Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-20 12:19 -0600

#87788 — Threading: execute a callback function in the parent thread

Hi everyone,

just like the title says I'm searching for a mechanism which allows to call a callback function from a thread, being the callback executed in the parent thread (it can also be the main thread). I'm basically looking for something like the CallAfter method of the wx or the signal slot mechanism of the pyqt. Is there something similar but made only in native python? any workaround is welcome.

Thanks in advance.

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#87791

On Fri, Mar 20, 2015 at 11:29 AM,  <massi_srb@msn.com> wrote:
> Hi everyone,
>
> just like the title says I'm searching for a mechanism which allows to call a callback function from a thread, being the callback executed in the parent thread (it can also be the main thread). I'm basically looking for something like the CallAfter method of the wx or the signal slot mechanism of the pyqt. Is there something similar but made only in native python? any workaround is welcome.

There's no general way to tell another thread to execute something,
because that thread is *already* executing something -- you can't just
interrupt it and say "here, do this instead". There has to be some
mechanism in place for scheduling the thing to be executed. You can do
this with the main thread of frameworks like wx because the main
thread in that case is running an event loop which enables the
callback to be scheduled.

If your target thread is not running an event loop or being used as an
executor (either of which should provide a specific API for this),
then you will need to have that thread explicitly checking a callback
queue from time to time to see if there's anything ready for it to
call.

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