Merge pull request #141 from ruby-concurrency/actress

Wait for all children to terminate

Author: Petr Chalupa

lib/concurrent/actor/behaviour/terminates_children.rb

@@ -4,7 +4,7 @@ module Behaviour
       # Terminates all children when the actor terminates.
       class TerminatesChildren < Abstract
         def on_event(event)
-          children.each { |ch| ch << :terminate! } if event == :terminated
+          children.map { |ch| ch.ask :terminate! }.each(&:wait) if event == :terminated
           super event
         end
       end