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From: Antoine Pitrou <solipsis@pitrou.net>
Subject: Re: Using =?utf-8?b?UHlfQWRkUGVuZGluZ0NhbGw=?=
Date: Mon, 17 Sep 2012 22:42:20 +0000 (UTC)
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Xref: csiph.com comp.lang.python:29392

css322 <charles.salvia316 <at> gmail.com> writes:
> 
> (1) A worker thread calls Py_AddPendingCall and assigns a handler function.
> (2) When the Python interpreter runs, it calls the handler function whenever
it yields control to another thread

Not exactly. As the documentation says: "If successful, func will be called 
with the argument arg *at the earliest convenience*."
This is a deliberately vague wording to stress that the function will not be
called as early as you think. It *should* be called in a timely manner, but not
necessarily as soon as the thread switch happens.

Which begs the question:

> In this example, worker_thread is invoked in C as a pthread worker thread. This
> loops infinitely, but the pending call handler is never invoked.

What is your main Python thread doing? Is it running Python code (*)? Or do you
have a main Python thread at all? The "main Python thread" is the one from which
Py_Initialize() was called.

(*) for example, running one of the following functions:
http://docs.python.org/dev/c-api/veryhigh.html

Regards

Antoine.