From: Scott <scott.h.snyder@...>
Date: 2006-08-11T00:05:08+09:00
Subject: Adding MonitorMixin causes compile failure when initialize takes a parameter

Hi, I am a relative newbie in Ruby and I need to do some simple thread
based programs.
In the new pickaxe book I saw this code for enabling a synchronized
block using a MonitorMixin

require 'monitor'

class Counter
	include MonitorMixin
	attr_reader :count
	def initialize
		@count = 0
		super
	end
	def tick
		synchronize do
			@count += 1
		end
		puts @count
	end
end

c = Counter.new
t1 = Thread.new{10000.times {c.tick} }
t2 = Thread.new{10000.times {c.tick} }
t1.join; t2.join

This works fine, except that in my application the class takes a
parameter, so I added a parameter to the new call and a parameter to
the initialize method as below,

require 'monitor'

class Counter
	include MonitorMixin
	attr_reader :count
	def initialize(init_param)
		@count = init_param
		super
	end
	def tick
		synchronize do
			@count += 1
		end
		puts @count
	end
end

c = Counter.new(2)
t1 = Thread.new{10000.times {c.tick} }
t2 = Thread.new{10000.times {c.tick} }
t1.join; t2.join

And when I do it fails to compile with the following error.
`initialize': wrong number of arguments (1 for 0) (ArgumentError)

What am I doing wrong?

Thanks for you r help with this 

Scott