Do not stop the EventMachine's reactor when Thin was started

inside a running loop.

Eg.:

  EM.run
    server = Thin::Server.start(3000)
    # This will NOT call EM.stop because Thin was started inside a
    # running loop.
    server.stop
  end

Author: macournoyer

lib/thin/backends/base.rb

@@ -53,6 +53,7 @@ def initialize
         @no_epoll                       = false
         @ssl                            = nil
         @threaded                       = nil
+        @started_reactor                = false
       end
 
       # Start the backend and connect it.
@@ -67,6 +68,7 @@ def start
         if EventMachine.reactor_running?
           starter.call
         else
+          @started_reactor = true
           EventMachine.run(&starter)
         end
       end
@@ -88,7 +90,7 @@ def stop!
         @running  = false
         @stopping = false
 
-        EventMachine.stop if EventMachine.reactor_running?
+        EventMachine.stop if @started_reactor && EventMachine.reactor_running?
         @connections.each_value { |connection| connection.close_connection }
         close
       end