From: Lee Hinman <matthew.hinman@...>
Date: 2009-06-23T14:06:59+09:00
Subject: Threads + Forks in Ruby 1.9.1p129

Hey All,
I'm seeing some weirdness trying to get Ara's forkoff gem working on  
ruby 1.9.1.

Here's some code that duplicates the problem:

#!/usr/bin/env ruby
require 'thread'
t1 = Thread.new do
   pid = fork
   unless pid
     sleep(1)
     exit
   end
   Process.waitpid(pid)
end
t2 = Thread.new do
   pid = fork
   unless pid
     sleep(1)
     exit
   end
   Process.waitpid(pid)
end
t1.join
t2.join

On Ruby 1.8.6, it runs for ~1.2 seconds, then exits. On Ruby 1.9.1, it  
runs and hangs forever and I'm left with zombie processes every time I  
run it.

Can someone help me understand why this code hangs indefinitely  
please? Some kind of deadlock issue (similar to bug #1525) maybe?

Full ruby version: ruby 1.9.1p129 (2009-05-12 revision 23412) [i386- 
darwin9.7.0] (on OSX 10.5)

Thanks,
Lee