Add preforking model for a more solid concurrency

Author: gauravmc

config.ru

@@ -1,7 +1,7 @@
 class App
   def call(env)
     if env['PATH_INFO'] == '/'
-      [200, { 'Content-Type' => 'text/html' }, ['Hello from the rack application inside config.ru.']]
+      [200, { 'Content-Type' => 'text/html' }, ["Hello from the rack application inside config.ru with PID: #{Process.pid}\n"]]
     else
       [404, { 'Content-Type' => 'text/html' }, ['Boo.']]
     end

hyperloop.rb

@@ -8,11 +8,30 @@ def initialize port
     @server = TCPServer.new port
   end
 
+  def prefork
+    3.times do
+      fork do
+        start
+      end
+    end
+
+    waitall
+  end
+
+  def waitall
+    Process.waitall
+
+  rescue Interrupt
+    puts "\nKilled all. No zombies."
+  end
+
   def start
     loop do
       socket = @server.accept
       Thread.new { SocketHandler.new(socket).process }
     end
+
+  rescue Interrupt
   end
 end
 
@@ -95,4 +114,4 @@ def close_socket
 
 server = Hyperloop.new 3000
 puts "Starting Hyperloop server on port 3000"
-server.start
+server.prefork