From: "Morris, Chris" <chris.morris@...>
Date: 2002-05-30T22:04:41+09:00
Subject: Thread id?

The following is the pickaxe thread example that outputs the id value of
each thread:

  require 'net/http'
  
  pages = %w( www.rubycentral.com
              www.awl.com
              www.pragmaticprogrammer.com
             )
  
  threads = []
  
  for page in pages
    threads << Thread.new(page) { |myPage|
  
      h = Net::HTTP.new(myPage, 80)
      puts "Fetching: #{myPage}"
      resp, data = h.get('/', nil )
      puts "Got #{myPage}:  #{resp.message} #{id.to_s}"
    }
  end
  
  threads.each { |aThread|  aThread.join }
  
Why does each thread output the same id value?

S:\SF-scrapware\scrapware\ruby\cl\index\src>thread
Fetching: www.rubycentral.com
Fetching: www.awl.com
Fetching: www.pragmaticprogrammer.com
Got www.rubycentral.com:  OK 22268684
Got www.pragmaticprogrammer.com:  OK 22268684
Got www.awl.com:  OK 22268684

S:\SF-scrapware\scrapware\ruby\cl\index\src>ruby -e 'puts RUBY_VERSION'
1.6.6

According to ri.rb:

"The same number will be returned on all calls to id for a given object, and
no two active objects will share an id."

Isn't each Thread instance a separate object?

Chris Morris
chris.morris@snelling.com