[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
lost).
--
- 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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