module WEBrick
  module Utils
    #
    # Sets IO operations on +io+ to be non-blocking
    def self?.set_non_blocking: (IO io) -> void

    #
    # Sets the close on exec flag for +io+
    def self?.set_close_on_exec: (IO io) -> void

    #
    # Changes the process's uid and gid to the ones of +user+
    def self?.su: (String user) -> void

    #
    # The server hostname
    def self?.getservername: () -> String

    #
    # Creates TCP server sockets bound to +address+:+port+ and returns them.
    #
    # It will create IPV4 and IPV6 sockets on all interfaces.
    def self?.create_listeners: (String host, Integer port) -> Array[TCPServer]

    #
    # Characters used to generate random strings
    RAND_CHARS: String

    #
    # Generates a random string of length +len+
    def self?.random_string: (Integer len) -> String

    #
    # Class used to manage timeout handlers across multiple threads.
    #
    # Timeout handlers should be managed by using the class methods which are
    # synchronized.
    #
    #   id = TimeoutHandler.register(10, Timeout::Error)
    #   begin
    #     sleep 20
    #     puts 'foo'
    #   ensure
    #     TimeoutHandler.cancel(id)
    #   end
    #
    # will raise Timeout::Error
    #
    #   id = TimeoutHandler.register(10, Timeout::Error)
    #   begin
    #     sleep 5
    #     puts 'foo'
    #   ensure
    #     TimeoutHandler.cancel(id)
    #   end
    #
    # will print 'foo'
    #
    class TimeoutHandler
      @queue: Thread::Queue

      @watcher: Thread?

      include Singleton

      #
      # Mutex used to synchronize access across threads
      TimeoutMutex: Thread::Mutex

      #
      # Registers a new timeout handler
      #
      # +time+:: Timeout in seconds
      # +exception+:: Exception to raise when timeout elapsed
      def self.register: (Numeric seconds, singleton(Exception) exception) -> Integer

      #
      # Cancels the timeout handler +id+
      def self.cancel: (Integer id) -> bool

      def self.terminate: () -> Thread?

      #
      # Creates a new TimeoutHandler.  You should use ::register and ::cancel
      # instead of creating the timeout handler directly.
      def initialize: () -> void

      private

      def watch: () -> bot

      def watcher: () -> Thread

      public

      #
      # Interrupts the timeout handler +id+ and raises +exception+
      def interrupt: (Thread thread, Integer id, singleton(Exception) exception) -> nil

      #
      # Registers a new timeout handler
      #
      # +time+:: Timeout in seconds
      # +exception+:: Exception to raise when timeout elapsed
      def register: (Thread thread, Numeric time, singleton(Exception) exception) -> Integer

      #
      # Cancels the timeout handler +id+
      def cancel: (Thread thread, Integer id) -> bool

      #
      def terminate: () -> Thread?
    end

    #
    # Executes the passed block and raises +exception+ if execution takes more
    # than +seconds+.
    #
    # If +seconds+ is zero or nil, simply executes the block
    def self?.timeout: [T] (Numeric? seconds, ?singleton(Exception) exception) { (?Numeric) -> T } -> T
  end
end