From: Jacob Fugal <lukfugl@...>
Date: 2005-09-03T08:20:15+09:00
Subject: Re: Idiomatic conversion of yielding block to array

On 9/2/05, Simon Kr�ger <SimonKroeger@gmx.de> wrote:
> Jacob Fugal wrote:
> > Why not something simple like so:
> > ... <snip> ...
>
> because zip converts each argument to an array, which isn't what you
> want if there are many lines.

Ah, yes. I'd probably do it with SyncEnumerator rather than zip as
well, then[1]. I just used zip since its what you started with and you
didn't specify performance as an issue.

> True SyncEnumerator does it with continuations but i wasn't ready for
> this mind bending stuff (yet). (and now i don't need to make knots in my
> brain, because Levin was so nice to tell us about SyncEnumerator)

Very true. Thanks, Levin.

> But what exactly isn't thread safe? SizedQueue is.

Unless SizedQueue is built with threads in mind and does alternating
blocking on pushes (<<) and pops. If it does, I apologize.

Assuming I'm not wasting time by not looking at the SizedQueue
documentation, the problem is that there's no guarantee that the main
thread won't run several pops before returning control to the thread
that's pushing into the queue.

> Threads aren't evil.

No, but naive non-thread-safe code is. Well, it's broken, at least...
not necessarily *evil*. :)

Jacob Fugal