From: kjana@...4lab.to (YANAGAWA Kazuhisa)
Date: 2002-09-23T00:30:11+09:00
Subject: Re: Avoiding busy waiting

In message <200209221747.22910.harryo@zip.com.au>
harryo@zip.com.au writes:

> I note that the documentation in PR says that
> ConditionVariable.signal() wakes up the first thread in line waiting
> for the lock.  Does that mean that if noone is waiting, the signal
> just gets thrown away?  In that case, things may be OK.

Yes, ConditionVariable#signal just dequeues a thread waiting on the
ConditionVariable and awakes it.

See thread.rb.  `t.run if t' means that.


> Anyway, I guess you get the picture.  Is there a clean way to handle this 
> situation?  Maybe there's a library or class I'm not aware of that provides 
> this kind of blocking queue.

And then see thread.rb again.  There's Queue and SizedQueue which
implements synchronized queue.

# Actually I've not used Thread more than toy examples, but I believe
# logically it works unless a bug exists.


-- 
kjana@dm4lab.to                             September 23, 2002
He knows most who speaks least.