From: Bill Atkins <batkins57@...>
Date: 2005-08-09T07:55:15+09:00
Subject: Re: Threading+TCPServer issues on Win32

Right, I tried select as well, but no dice.  Is there some workaround,
aside from splitting off separate processes?

Bill

On 8/8/05, Simon Kr�ger <SimonKroeger@gmx.de> wrote:
> Bill Atkins wrote:
> 
> > I'm having an issue with threading and TCP servers on Win32.  I've
> > boiled down the issue to the following code:
> >
> > -----
> >
> > require 'socket'
> >
> > t = Thread.new do
> >   serv = TCPServer.new '', 344
> >   sock = serv.accept
> >   sock.puts "ok"
> >   sock.close
> >   serv.close
> > end
> >
> > puts "OK, enter text: "
> > puts gets
> >
> > -----
> >
> > So with a server listening in the background, the program should
> > accept one new request and respond with "ok".  In the meantime, it
> > should be waiting for the user to enter text on STDIN.
> >
> > If this program is running in a UNIX environment, I can telnet to port
> > 344 and I'll be greeted with "ok" and the program will continue to
> > wait for user input.  However, when I run the same code on Windows,
> > the connection on port 344 opens (i.e. there is no connection refused
> > error), but no text is received.  If I enter a word on the server's
> > STDIN and hit enter, the server quits and the connection is severed,
> > but the "ok" still doesn't get to the client.
> >
> > I am quite possibly missing something obvious here, but I'm not sure
> > what it is.  Any help would be appreciated.
> >
> 
> Hi Bill,
> 
> that's the same problem as
> 
> require 'timeout'
> timeout(1){ puts gets }
> 
> this will never return (or throw the timeout exception) as
> long as you do not hit a key.
> Ruby has no native threads, it gets stuck on blocking system
> calls.
> 
> I tried to circumvent the problem with Kernel#select, but for
> some reason
> 
> select( [$stdin], nil, nil, 1.5 )
> 
> always returns immediately. Is there someone who can explain?
> 
> cheers
> 
> Simon
> 
> 


-- 
Bill Atkins