From: Dave Thomas <Dave@...>
Date: 2001-07-28T23:22:25+09:00
Subject: [ruby-talk:18699] Possible threading problem under Windows



I'm working on getting Rubicon to run to completion under Windows, and
I've come across a possible problem with threading.

     threads = []
     3.times do |i|
       threads << Thread.new(i) do |tno|
         1000000.times do |i|
           puts("#{tno}: #{i}") if i%100000 == 0
         end
       end
     end

     puts "Waiting"
     threads.each {|t| t.join}
     puts "Done"


Under Linux, the above produces:

     0: 0
     1: 0
     2: 0
     Waiting
     0: 100000
     1: 100000
     2: 100000
     0: 200000
     1: 200000
     2: 200000
     0: 300000
     1: 300000
     2: 300000
     .....
     0: 900000
     1: 900000
     2: 900000
     Done

On my W2K box, with a freshly compiled 1.7.1/Cygwin, I get

     0: 0
     0: 100000
     0: 200000
     0: 300000
     0: 400000
     0: 500000
     0: 600000
     0: 700000
     0: 800000
     0: 900000
     1: 0
     1: 100000
     1: 200000
     1: 300000
     1: 400000
     1: 500000
     1: 600000
     1: 700000
     1: 800000
     1: 900000
     2: 0
     2: 100000
     2: 200000
     2: 300000
     2: 400000
     2: 500000
     2: 600000
     2: 700000
     2: 800000
     2: 900000
     Waiting
     Done

That is, all threads run to completion: there's no preemption. The
same thing happens with the 1.6.4 from the Installshield distribution.

Dave