Re: [Pyobjc-dev] PyObjC and multiprocessing module

[Ronald O. <ron...@ma...>]

On 7 Dec, 2011, at 23:54, Trevor Bentley wrote:

> I found a bunch of hits for this on Google, but no answers:
> 
> I am working on a Python application that uses the multiprocessing library.  I am trying to spawn a process and perform text-to-speech with pyttsx, but I get the dreaded  __THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___YOU_MUST_EXEC__()  error.

Most of Apple's frameworks beyond the basic Unix tools require that you child proceses immediately call execv() instead of forking of a child and doing work there as multiprocessing does.
> 
> Is there any way to get this working, short of switching back to threads?  I see that the 'correct' way is to fork() and exec(), but I don't see any way to make that compatible with the multiprocessing module's API.

Multiprocessing uses fork+exec on windows, because those aren't separate system calls there but AFAIK you cannot force the multiprocessing library to do the same on Unix platforms.

Could you file a bug on python's tracker about the problem you ran into?  A demo program that only uses the stdlib would be great (possibly something using Tkinter), but isn't required.

Ronald

> 
> Thanks,
> 
> -Trevor
> 
> ------------------------------------------------------------------------------
> Cloud Services Checklist: Pricing and Packaging Optimization
> This white paper is intended to serve as a reference, checklist and point of 
> discussion for anyone considering optimizing the pricing and packaging model 
> of a cloud services business. Read Now!
> http://www.accelacomm.com/jaw/sfnl/114/51491232/_______________________________________________
> Pyobjc-dev mailing list
> Pyo...@li...
> https://lists.sourceforge.net/lists/listinfo/pyobjc-dev