From: ts <decoux@...>
Date: 2002-03-28T23:17:10+09:00
Subject: Re: Threads in Iterators

>>>>> "N" == Norman Makoto Su <normsu@slab.tnr.sharp.co.jp> writes:

N> My concern is if there is a chance that two yields will happen at the same time
N> and mess things up (vals will be corrupted).  Is this possible?

 It depend what you call corrupted

pigeon% cat b.rb
#!/usr/bin/ruby
arr = [1,2,3,4]
def arr.each
  0.upto(length-1) do |i|
    Thread.new(self[i]) {|val|
      sleep(rand .1)
      yield val
    }
  end
end
vals = []
val = nil
arr.each {|val|
   vals << val
   sleep(rand .1)
   vals << (val + 10)
}
Thread.list.each do |aThread|
  aThread.join if aThread != Thread.current
end
puts vals
pigeon% 

pigeon% b.rb
4
14
3
1
11
2
12
12
pigeon% 

pigeon% b.rb
2
1
3
13
13
13
4
14
pigeon% 

Guy Decoux