ruby druby在同一个脚本文件中（原始资料，甚至缺少互斥体等）

Posted 2021-05-16

require 'drb/drb'

main_pid = Process.pid

f_proc_id = fork do
  puts "Started server fork with pid: #{Process.pid}, gpid: #{Process.getpgid(main_pid)}"

  class Front
    def initialize
      @global = [1,2,3,4]
    end

    def pop
      @global.pop
    end
  end

  f = Front.new
  DRb.start_service 'drbunix:/tmp/drb000', f
  DRb.thread.join
end

puts 'preparing to fork'
until File.exist? '/tmp/drb000'
  sleep 1
end
puts 'server ready'

pids = []
(1..3).each do

  pids << fork do
    puts "Hello from fork pid: #{Process.pid}"
    r = DRbObject.new_with_uri 'drbunix:/tmp/drb000'
    puts r.pop
  end

end

# hold your breath until all children finish
until pids.all? { |p|
  !system("ps --no-headers -p #{p} > /dev/null 2>&1") ||
      system("ps --no-headers -p #{p} | grep defunct> /dev/null 2>&1")
}
  sleep 1
end

puts 'shutting down main fork'
Process.kill 'HUP', f_proc_id

puts 'done'