From: Eric Hodel <drbrain@...7.net>
Date: 2004-12-04T02:59:10+09:00
Subject: Re: [nuby] about ruby multithreading

On 03 Dec 2004, at 08:12, Michael Neumann wrote:

> James Edward Gray II wrote:
>> On Dec 3, 2004, at 9:47 AM, Lionel Thiry wrote:
>> Hmm, good question.  I assume yes, but let's let someone who knows 
>> better than me answer this one...  ;)
>
> Yes:
>
>   Thread.new {
>     loop do
>       sleep 1
>       p "."
>     end
>    }
>
>    system("sleep 10000")
>
> And for IO operations, this is true, too. Ruby does not block on 
> read/write as it internally uses select.

No, system does not block other ruby threads.

$ cat x.rb
STDOUT.sync = true

Thread.new {
   loop do
     sleep 1
     puts Time.now
   end
}

system("sleep 10")

$ ruby -v x.rb
ruby 1.8.2 (2004-11-06) [powerpc-darwin7.6.0]
Fri Dec 03 09:57:47 PST 2004
Fri Dec 03 09:57:48 PST 2004
Fri Dec 03 09:57:49 PST 2004
Fri Dec 03 09:57:50 PST 2004
Fri Dec 03 09:57:51 PST 2004
Fri Dec 03 09:57:52 PST 2004
Fri Dec 03 09:57:53 PST 2004
Fri Dec 03 09:57:54 PST 2004
Fri Dec 03 09:57:55 PST 2004
$