From: Bram Kuijper <a.l.w.kuijper@...>
Date: 2007-11-07T01:01:08+09:00
Subject: ruby thread newbie problem

Hi all,

As a ruby newbie, I am trying to have two Threads process the
contents of one Queue. However, in my code only one Thread is processing
the contents of Queue, instead of both Threads. How can I make sure that
_both_ Threads process the Queue mentioned below?


This is my code:

queue = Queue.new
queue << "$contents_of_queue"
queue << "$contents_of_queue"
queue << "$contents_of_queue"

threads = []

2.times do |thread_index|
	threads[thread_index] =
		Thread.new(thread_index) do | this_thread_name |
		
	# let each Thread work with things from the queue
	while ! queue.empty?	

			contents_of_queue = queue.deq

			# output Thread number
			puts "executing #{contents_of_queue} " \
				+ "by thread #{this_thread_name}"

		end
	end	
end

This code will output:
"executing $contents_of_queue by thread 0"
"executing $contents_of_queue by thread 0"
"executing $contents_of_queue by thread 0"

my question is: why will thread 1 never show up?

thanks,
Bram