Re: [gentoo-portage-dev] PATCH: gentoolkit: Make portage.config object a global object

[Brian Harring]

On Tue, Sep 20, 2005 at 06:55:44PM -0500, Paul Varner wrote:
> On Tue, 2005-09-20 at 18:34 -0500, Brian Harring wrote:
> > > Updated patch to add a semaphore to control access to the global
> > > portage.config object. Unless anyone sees any other issues with this
> > > patch, I will be placing it into gentoolkit.
> > Reason for a semaphore over threading.Lock ?
>
> No reason other than I'm used to thinking of them as semaphores instead
> of locks, so semaphore is what I searched for in the Python docs.
Need to make some chunks of the rewrite thread safe, so I poked a bit;
python -m timeit -n 10000 -r 3 -s 'import threading;s=threading.Lock()' 's.acquire();s.release()'
around 1us
python -m timeit -n 10000 -r 3 -s 'import threading;s=threading.Semaphore()' 's.acquire();s.release()'
20us

Granted... It's being anal.  Just surprised me, and figured I'd poke 
to find out if you had a specific reason for using sem over the 
simpler (pretty much straight cpython) Lock :)
~harring