From: Eric Wong <normalperson@...>
Date: 2011-03-02T04:16:53+09:00
Subject: Re: question: threads behaviour

Robert Klemme <shortcutter@googlemail.com> wrote:
> > 1.8 will schedule other threads if the blocking IO is for a socket/pipe
> > and uses the normal Ruby IO interfaces (or the extension author was
> > careful).  Filesystem I/O (including NFS) can block the entire process
> > in 1.8.
> 
> Where do you take that from?  AFAIK internally Ruby 1.8.* uses non
> blocking IO calls in combination with select() to be able to let other
> threads work while IO is under way.

Yes, I meant "blocking" from a user-visible perspective, not from a
kernel perspective.  If there's an EAGAIN it'll block the current thread
from a user perspective and schedule others using select(), but not
actually block on the syscall that caused EAGAIN.

-- 
Eric Wong