[Python-Dev] tiny optimization in ceval mainloop

Jack Jansen Jack.Jansen@cwi.nl
Fri, 30 Aug 2002 10:18:26 +0200

On Friday, August 30, 2002, at 03:37 , Skip Montanaro wrote:

>     Greg> Could you have just one ticker, instead of one per thread?
> That would make ticker really count down checkinterval ticks.  Also, of
> possible interest is this declaration and comment in longobject.c:
>     static int ticker;  /* XXX Could be shared with ceval? */
> Any time C code would want to read or update ticker, it would have the 
> GIL,
> right?

Not if the idea that lead to this thread (clearing ticker if something 
is put in things_to_do)
is implemented, because we may be in an interrupt routine at the time we 
fiddle things_to_do.

And I don't think we can be sure that even clearing is guaranteed to 
work (if another
thread is halfway a load-decrement-store sequence the clear could be 
- Jack Jansen        <Jack.Jansen@oratrix.com>        
http://www.cwi.nl/~jack -
- If I can't dance I don't want to be part of your revolution -- Emma 
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