From: Jamis Buck <jgb3@...>
Date: 2004-09-12T02:23:15+09:00
Subject: Re: Net-SSH Threaded PortForward Script Problems

otaku wrote:
> Justin,
> 
> i am not sure the syntax is correct
> however its looking like perhaps you may be correct
> in regard to the race condition
> 
> the Programming Ruby book provides an example of using mutex

[snip]

You want more than just a mutex, though--you need a condition variable. 
The CV lets you wait until some other condition has been satisfied (it's 
useful for helping to prevent deadlocks):

   require 'thread'

   m = Mutex.new
   cv = ConditionVariable.new

   Thread.new do
     m.synchronize do
       # do some work
       cv.signal
     end
   end

   # wait until the cv is signaled
   m.synchronize { cv.wait( m ) }

Justin was saying you need to use a condition variable to let your 
program know that the threads have all started properly, and are ready 
to accept connections.

-- 
Jamis Buck
jgb3@email.byu.edu
http://www.jamisbuck.org/jamis

"I use octal until I get to 8, and then I switch to decimal."