From: Sonny Chee <sonny.chee@...>
Date: 2007-03-31T01:55:41+09:00
Subject: Re: Exceptions occassionally lost by child threads

Thanks guys.  My bad.  For some reason I thought join(1) returned nil 
when the thread completed.  That should learn me to post messages when 
I'm half asleep:"P

In the following snippet the parent always catches the exception 
regardless of the position of the sleep 1 statment.

a = Thread.new {
  begin
    puts 'blue'
    sleep 2;
    raise ArgumentError.new('green')
  rescue Exception => err
    puts "Caught: #{err.message}"
    raise err
  end
}

begin
  b = a
  while a
    sleep 1   # position 1
    b = a.join(1)
    a = b if !a
    sleep 1   # position 2
  end
  puts 'yellow'
rescue Exception => err
  puts "Caught it again: #{err.message}"
end

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