threadsafe?

threadsafe_array.rb

#!/usr/bin/env ruby

class Foo

  def initialize level
    @level = level
  end

  def decrease it
    @level[it] -=1
  end

  def [](it)
    @level[it]
  end
end

f = Foo.new(a: 1000, b: 200, c: 300)
## start 10 threads and use them to redice by 10 ==> 10 * 10 = 100

puts "Before"
p f
t = Array.new
100.times {
    t<< Thread.new{
        10.times { f.decrease(:a) }
        p f[:a]
    }
}

t.each(&:join)
puts "After"
p f