From: "ara.t.howard" <ara.t.howard@...>
Date: 2007-09-11T13:43:57+09:00
Subject: Re: Thread deadlock problem


On Sep 10, 2007, at 9:35 PM, wimxa@yahoo.com wrote:

> require 'thread'
>
> mutex = Mutex.new
> c_produce = ConditionVariable.new
> c_consume = ConditionVariable.new
> full = false
> t1 = Thread.new do
>   while true
> 	 mutex.synchronize do
> 		c_produce.wait mutex while full
> 		print 'F'
> 		full = true
> 		c_consume.signal
> 	 end
>          #sleep 0.001
>   end
> end
> t2 = Thread.new do
>   while true
> 	 mutex.synchronize do
> 		c_consume.wait mutex while !full
> 		print '.'
> 		full = false
> 		c_produce.signal
> 	 end
>   end
> end
> t1.join
> t2.join

it seems like you are making if very hard on yourself.  why not  
something like this:

cfp:~ > cat a.rb
require 'thread'

q = SizedQueue.new 42

producer = Thread.new do
   loop do
     q.push Time.now.to_f
   end
end

consumer = Thread.new do
   loop do
     p(( data = q.pop ))
   end
end

producer.join
consumer.join

??

if you really want to roll your own stuff check out the code in  
thread.rb - the Queue and SizedQueue classes are basically the code  
you are writing above.


cheers.

a @ http://drawohara.com/
--
we can deny everything, except that we have the possibility of being  
better. simply reflect on that.
h.h. the 14th dalai lama