Imported minitest 4.3.2 (r8026)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37967 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/minitest/parallel_each.rb

@@ -0,0 +1,36 @@
+# encoding: utf-8
+######################################################################
+# This file is imported from the minitest project.
+# DO NOT make modifications in this repo. They _will_ be reverted!
+# File a patch instead and assign it to Ryan Davis.
+######################################################################
+
+class ParallelEach
+  require 'thread'
+  include Enumerable
+
+  N = (ENV['N'] || 2).to_i
+
+  def initialize list
+    @queue = Queue.new # *sigh*... the Queue api sucks sooo much...
+
+    list.each { |i| @queue << i }
+    N.times { @queue << nil }
+  end
+
+  def grep pattern
+    self.class.new super
+  end
+
+  def each
+    threads = N.times.map {
+      Thread.new do
+        Thread.current.abort_on_exception = true
+        while job = @queue.pop
+          yield job
+        end
+      end
+    }
+    threads.map(&:join)
+  end
+end