factor out poll_readers

lib/foreman/engine.rb

@@ -94,11 +94,7 @@ private ######################################################################
     kill_all "SIGKILL"
   end
 
-  def watch_for_output
+  def poll_readers
-    Thread.new do
-      require "win32console" if Foreman.windows?
-      begin
-        loop do
     rs, ws = IO.select(readers.values, [], [], 1)
     (rs || []).each do |r|
       data = r.gets
@@ -108,6 +104,14 @@ private ######################################################################
       info message, ps, color
     end
   end
+
+  def watch_for_output
+    Thread.new do
+      require "win32console" if Foreman.windows?
+      begin
+        loop do
+          poll_readers
+        end
       rescue Exception => ex
         puts ex.message
         puts ex.backtrace