From: Joel VanderWerf <vjoel@...>
Date: 2006-02-19T06:48:52+09:00
Subject: Re: Hello, and a question about finding a defined Class from C

Jacob Repp wrote:
> It's not that simple. For example:
> 
> # server
> server = Thread.new {
>   s = UDPSocket.open
>   s.bind(nil, 5000)
>   while(true)
>     data, cli = s.recvfrom(256)
>     puts "Server got #{data} from #{cli}"
>     Thread.pass
>   end
> }
> client = Thread.new {
>   s = UDPSocket.open
>   s.connect('localhost', 5000)
>   while(true)
>      s.send("hello", 0)
>      Thread.pass
>   end
> }
> 
> The problem occurs on the first call that the sever thread makes to
> recvfrom(). This is a blocking call and since ruby is actually a
> single threaded process (with virtual soft threads) this hangs all of
> the other virtual threads. So for my test app which is trying to run a
> simulation thread as well as handle socket and console IO this becomes
> a problem quickly.

That code works fine for me, using ruby-1.8.4, both linux and windows 
(the one-click msvc-built version).

Also, the Thread.pass is not needed.

I did add a line at the end:

sleep

(You could also use Thread.join(client) or similar.)

-- 
        vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407