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Re: os.wait in svntest.main.copy_repos?

From: David Glasser <glasser_at_davidglasser.net>
Date: 2007-10-18 01:51:15 CEST

On 10/17/07, David Glasser <glasser@davidglasser.net> wrote:
> On 10/17/07, Philip Martin <philip@codematters.co.uk> wrote:
> > "David Glasser" <glasser@davidglasser.net> writes:
> >
> > > Oh, and also --parallel is broken: it makes a bunch of threads, each
> > > of which call popen3 and then wait, but there's no guarantee that the
> > > test they wait on will be the test they popen3'd.
> >
> > It also modifies an array in multiple threads without any locking; I
> > posted a mutex patch but then gave up when I encountered the wait
> > problem.
> From searching, it does appear that .append on a list should be
> atomic. However, I think we'll be happier if we just change it to use
> Queue. Will work on that now...

See r27264. In addition to only using explicitly synchronized data
structures, I think the new design is conceptually cleaner, and it
eliminates a lot of sleeps; seems to speed me up a small amount too.
Unfortunately the wait issues still exist.


David Glasser | glasser_at_davidglasser.net | http://www.davidglasser.net/
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Received on Thu Oct 18 01:51:24 2007

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