From: Christopher Rose <chrisrose.chrisrose@...>
Date: 2007-04-24T01:46:04+09:00
Subject: threads demo from pickaxe book - newbie question

All,

Please forgive a newbie question - I have tried searching for errata on
the Pickaxe book (2nd ed) but not found an answer.  I am running Ruby
1.8.2 on WinXP.  I type in, or source from file, the example - from pg.
143, copied below - into the interactive ruby prompt in the fxri tool.
I get to the line

t1.join ; t2.join

and the tool hangs.  Is this expected?  Is there some better way(s) to
debug thread-related issues?  Thanks for any advice -

Chris

P.S. Could someone please explain the purpose of the 'super' command in
this script?  Thx -

-----------------------<begin example pg. 143>----------------------



# with my current version of fxri, this hangs
 require 'monitor'
 class Counter < Monitor
  attr_reader :count
  def initialize
    @count = 0
    super
  end
  def tick
    synchronize do
      @count += 1
    end
  end
 end

 c = Counter.new
 t1 = Thread.new { 100_000.times { c.tick } }
 t2 = Thread.new { 100_000.times { c.tick } }

 t1.join ; t2.join

 c.count

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