From: Joel VanderWerf <vjoel@...>
Date: 2009-09-07T17:14:05+09:00
Subject: Re: Executing system commands in threads under Ruby 1.8.6

vhaerun vh wrote:
> I tried to write a script that makes use of external binaries. Each
> external binary is called from a different thread, but, under 1.8.6,
> this doesn't seem to work. Everything is executing in a sequential-like
> manner.
> The guys from StackOverflow said this was because of Ruby's thread
> implementation ( and when I tried the same code under JRuby, it worked
> ).
> 
> Is there some way to make my script work under 1.8.6, or is upgrading to
> 1.9 the only solution?

What do you mean by external binary? Something you invoke with #system 
or the like?

$ ruby -e 't=Thread.new {system "echo foo; sleep 1; echo bar"}; system 
"echo baz; sleep 1; echo quux"; t.join'
foo
baz
bar
quux

Note the order of output: baz before bar. So it's not sequential.

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