From: Roger Pack <rogerpack2005@...>
Date: 2009-06-24T04:17:54+09:00
Subject: Re: Threads + Forks in Ruby 1.9.1p129

> On 1.8.6 with green threads a fork() could result in a child process
> with all the threads present in the parent process, however I know
> that with the Apple default install of 1.8.6 on Leopard this is not
> the case. As I don't have the time to dig into the sources right now
> I'll float the hypothesis that 1.8.6 is being built with pthreads.

running this code:

Thread.new { puts 'hello'; loop { sleep 1; puts 'in 1' + 
Process.pid.to_s} }
fork {
 puts 'child' + Process.pid.to_s
 sleep
}
puts 'parent' + Process.pid.to_s
sleep

on ruby 1.8.7 [linux, no pthreads] results in only the parent running 
the thread, and also 1.9.2 does the same.  For what it's worth it seems 
that threads really don't run in child processes.

-=r
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