global_register_name.org

global:register_name(Name, Pid).
global:unregister_name(Name).
当global 出现命名冲突时，默认是随机kill其中一个
但也可以覆盖默认行为

 Resolve = fun(_Name,Pid1,Pid2) ->
     case process_info(Pid1, message_queue_len) > process_info(Pid2, message_queue_len) of
	 true -> Pid1;
	 false -> Pid2
     end
 end,
global:register_name({zombie, 12}, self(), Resolve).

而global 也默认提供了几个函数来解决这种冲突

• fun global:random_exit_name/3
  will kill a process randomly. This is the default option.
  
• fun global:random_notify_name/3
  will randomly pick one of the two processes as the one to
  survive, and it will send {global_name_conflict, Name} to the process
  that lost.
  
• fun global:notify_all_name/3
  it unregisters both pids, and sends the message {global_name_conflict,
  Name, OtherPid} to both processes and lets them resolve the issue
  themselves so they re-register again.