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extension call backs and the GIL

Robin Becker robin at jessikat.fsnet.co.uk
Mon Sep 29 10:05:33 EDT 2003 
In article <6q4qyvep55.fsf at salmakis.intevation.de>, Bernhard Herzog
<bh at intevation.de> writes
>Robin Becker <robin at jessikat.fsnet.co.uk> writes:
>
>>>You need to reacquire the GIL prior to making the callback.
>> So does calling an extension release the GIL?
>
>No. It would be very inconvenient if it did because what most functions
>do first is to call one of the PyArg_ParseTuple functions which could
>execute arbitrary python code.

Thank goodness for that :)

>
>I think it would help if you described a bit more what the actual
>problem is or what the user does. 
>
>I looked briefly at the sources and assuming tha the accelerator in
>question is lib/_rl_accel.c and the callback whatever has been assigned
>to _SWRecover, could it be that the problem is that your user tries to
>use different callbacks in different threads? _SWRecover is a global
>after all and shared by all threads.

I'm not certain, but yes I think that's probably what the problem comes
down to; if so I can claim there are already too many breakages in our
font system to worry about that :( 

>
>   Bernhard
>

-- 
Robin Becker
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