erlang 消息发送 gen_server:call cast info

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消息发送

• 启动server

  {ok,Pid} = gen_server_example:start().  

• 发送call消息

  Mref = erlang:monitor(process,Pid).
  erlang:send(Pid,{'$gen_call',{self(),Mref},a}).

  • 接收返回消息并关闭引用

   receive
      {Mref, Reply} ->
          erlang:demonitor(Mref, [flush]),
          {ok, Reply};
      {'DOWN', Mref, _, _, noconnection} ->
          Node = get_node(Process),
          exit({nodedown, Node});
      {'DOWN', Mref, _, _, Reason} ->
          exit(Reason)
      after Timeout ->
          erlang:demonitor(Mref, [flush]),
          exit(timeout)
      end

• 发送cast消息

  erlang:send(Pid,{'$gen_cast',a}).

• 发送info消息

  erlang:send(Pid,a).

• 调试相关命令

  exit(gen_server_example,0). 
  erlang:registered().   
  Pid = whereis(gen_server_example).