Message 149051 - Python tracker

Message149051

Author	mrmekon
Recipients	mrmekon, ronaldoussoren
Date	2011-12-08.20:26:13
SpamBayes Score	0.00022666578
Marked as misclassified	No
Message-id	<1323375974.18.0.406983892582.issue13558@psf.upfronthosting.co.za>
In-reply-to

Content
The multiprocessing package appears to spawn a new process by calling only fork(). Apple's CoreFoundation libraries (and possibly more, I do not know the full extent) require new processes to be spawned with the full fork()+exec*() combo. When using PyObjC to access native Mac libraries, Python's multithreading library is not usable. The error thrown is: ------------------------ The process has forked and you cannot use this CoreFoundation functionality safely. You MUST exec(). Break on __THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___YOU_MUST_EXEC__() to debug. ------------------------ Test code: https://gist.github.com/1448398

Content

The multiprocessing package appears to spawn a new process by calling only fork().  Apple's CoreFoundation libraries (and possibly more, I do not know the full extent) *require* new processes to be spawned with the full fork()+exec*() combo.

When using PyObjC to access native Mac libraries, Python's multithreading library is not usable.  The error thrown is:

------------------------
The process has forked and you cannot use this CoreFoundation functionality safely. You MUST exec().
Break on __THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___YOU_MUST_EXEC__() to debug.
------------------------

Test code: https://gist.github.com/1448398

History
Date	User	Action	Args
2011-12-08 20:26:14	mrmekon	set	recipients: + mrmekon, ronaldoussoren
2011-12-08 20:26:14	mrmekon	set	messageid: <1323375974.18.0.406983892582.issue13558@psf.upfronthosting.co.za>
2011-12-08 20:26:13	mrmekon	link	issue13558 messages
2011-12-08 20:26:13	mrmekon	create