vendor/rails/actionpack/lib/action_controller/vendor/rack-1.0/rack/lock.rb

   1 module Rack
   2   class Lock
   3     FLAG = 'rack.multithread'.freeze
   4
   5     def initialize(app, lock = Mutex.new)
   6       @app, @lock = app, lock
   7     end
   8
   9     def call(env)
  10       old, env[FLAG] = env[FLAG], false
  11       @lock.synchronize { @app.call(env) }
  12     ensure
  13       env[FLAG] = old
  14     end
  15   end
  16 end