rubyのthreadでエラーが出ない。

http://www.namaraii.com/rubytips/?%A5%B9%A5%EC%A5%C3%A5%C9#l7

このロジック。

ruby 1.8.7だと、正常に動作。

indou@MacBook:work:$ rvm use 1.8.7

Using /Users/indou/.rvm/gems/ruby-1.8.7-p370

indou@MacBook:work:$ ruby thread0.rb

500

Square(500) = 22.3606797749979

300

Square(300) = 17.3205080756888

.

indou@MacBook:work:$ 

ruby 1.9.3だと、正常に動作しない。

indou@MacBook:work:$ rvm use 1.9.3

Using /Users/indou/.rvm/gems/ruby-1.9.3-p194

indou@MacBook:work:$ ruby thread0.rb

500

300

.

indou@MacBook:work:$ 

indou@MacBook:work:$ sdiff thread0.rb.bk20121025 thread0.rb

require "thread"                              require "thread"

q = Queue.new                                   q = Queue.new

t = Thread.new do                              t = Thread.new do

  loop do                                     loop do

    n = q.pop                                       n = q.pop

    if n.to_i >= 0                                  if n.to_i >= 0

      val = Math::sqrt(n)                          |           begin

      puts "Square(#{n}) = #{val}"                     |             val = Math::sqrt(n)

                                         >             puts "Square(#{n}) = #{val}"

                                         >           rescue Exception => e

                                         >             p e

                                         >           end

    else                                       else

      puts "?"                                         puts "?"

    end                                            end

  end                                          end

end                                        end

while line = gets                              while line = gets

  if line.chop! == "."                                if line.chop! == "."

    break                                       break

  else                                          else

    q.push(line)                                  q.push(line)

  end                                          end

end                                        end

indou@MacBook:work:$ 

indou@MacBook:work:$ ruby  thread0.rb

500

#

.

indou@MacBook:work:$ 

なんだ。Math::sqrt(n)でエラーになってる。なんで、エラー表示されないんだろう。

indou@MacBook:work:$ cat ts.rb

n = gets

p Math::sqrt(n)

indou@MacBook:work:$ ruby ts.rb

500

ts.rb:3:in `sqrt': can't convert String into Float (TypeError)

     from ts.rb:3:in `

'

indou@MacBook:work:$

スレッドがなければエラー表示される。 

indou@MacBook:work:$ sdiff thread0.rb.bk20121025.1 thread0.rb

require "thread"                              require "thread"

q = Queue.new                                   q = Queue.new

t = Thread.new do                              t = Thread.new do

  loop do                                     loop do

    n = q.pop                                       n = q.pop

    if n.to_i >= 0                                  if n.to_i >= 0

      begin                                    |           val = Math::sqrt(n.to_i)

        val = Math::sqrt(n)                          |           puts "Square(#{n}) = #{val}"

        puts "Square(#{n}) = #{val}"                     <

      rescue Exception => e                          <

        p e                                    <

      end                                    <

    else                                       else

      puts "?"                                         puts "?"

    end                                            end

  end                                          end

end                                        end

while line = gets                              while line = gets

  if line.chop! == "."                                if line.chop! == "."

    break                                       break

  else                                          else

    q.push(line)                                  q.push(line)

  end                                          end

end                                        end

indou@MacBook:work:$ 

indou@MacBook:work:$ ruby  thread0.rb

500

Square(500) = 22.360679774997898

300

Square(300) = 17.320508075688775

.

indou@MacBook:work:$