From: Jaeyong Lee <crizin@...>
Date: 2010-11-17T16:50:41+09:00
Subject: Thread problem

Hi all,

I learning ruby thread and faced to thread problem.

Here's my test code that sum 1 to 1000.

--
threads = []

sum = 0

1.upto(1000) { |external|
  threads << Thread.new(external) { |local|
    sleep(rand(0.01))
    sum = sum + local
  }
}

threads.each() { |thread| thread.join() }

puts sum
--

I expected '500500' but output is smaller than. (ex: 499864)

Please let me know what problem is.

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