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bug#5372: Calling url-retrieve-synchronously in a timer

From: Stefan Monnier
Subject: bug#5372: Calling url-retrieve-synchronously in a timer
Date: Wed, 13 Jan 2010 14:57:58 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1.91 (gnu/linux)

>>>> Furthermore, it doesn't look like a good thing to
>>>> do anyway: timer code should not run for an indefinite amount of time,
>>> Maybe you misunderstod me.  If I do the call to
>>> url-retrieve-synchronously from the command loop it finishes very
>>> quickly (in this case), but if I do the same thing in a timer
>>> it hangs.
>> I understood you alright.  The fact that "it finishes quickly" when you
>> try it doesn't mean that it will always run in a definite amount of time.
> What is the problem with letting code in a timer run/wait for a long time?

Since it's run asynchronously, it can interrupt the user unexpectedly.

Also timer code is normally run with inhibit-quit non-nil, so the user
has no way to abort the timer code.  So you'd need to use
with-local-quit at least, which in turn means that if the user happens
to press C-g while your timer happens to be running, it will be aborted.


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