Rack::Lock locks every request inside a mutex, so that every request will effectively be executed synchronously.
# File lib/rack/lock.rb, line 10 def initialize(app, mutex = Mutex.new) @app, @mutex = app, mutex end
# File lib/rack/lock.rb, line 14 def call(env) old, env[FLAG] = env[FLAG], false @mutex.lock response = @app.call(env) body = BodyProxy.new(response[2]) { @mutex.unlock } response[2] = body response ensure @mutex.unlock unless body env[FLAG] = old end