EventMachine with fork and children ... Mark II

eventmachine-fork-example.rb

require 'rubygems'
require 'eventmachine'

require 'socket'

SOCKET = '/tmp/test.socket'

module Connection
  def receive_data(data)
    puts "\t#{data}"
  end
end

children = []

Signal.trap('SIGINT') do
  EventMachine.next_tick { EventMachine.stop_event_loop }
end

Signal.trap('EXIT') do
  puts "Killing #{children.size} children ..."

  children.each do |pid|
    Process.kill('SIGUSR1', pid) rescue Exception
  end
end

EventMachine.run do
  puts "Father PID: #{Process.pid}"

  EventMachine.start_unix_domain_server(SOCKET, Connection)

  EventMachine.add_periodic_timer(1) do
    puts "Father(#{Process.pid}): #{Time.now.to_s}"
  end

  4.times do |i|
    pid = EventMachine.fork_reactor do
      s = UNIXSocket.new(SOCKET)

      Signal.trap('SIGUSR1') do
        begin
          s.close unless s.closed?
        rescue IOError
        end

        EventMachine.stop_event_loop
      end

      Signal.trap('SIGCHLD') {}
      Signal.trap('EXIT')    {}

      EventMachine.add_periodic_timer(5) do
        s.send("Child[#{i}](#{Process.pid}): #{Time.now.to_s}", 0)
      end
    end

    children << pid

    puts "Child[#{i}] PID: #{pid}"

    Process.detach(pid)
  end
end