Sending message Pid Erlang

问题

I would like to know, how can i send a message to process with erlang. I did start a process and the output shows me that the pid is <0.39.0>. My problem is how can i send a message to this process (<0.39.0>) manually.

Anyhelp would be appreciated

回答1:

While list_to_pid/1 can indeed be used to construct a PID and use it to send messages its usage is discouraged:

This BIF is intended for debugging and for use in the Erlang operating system. It should not be used in application programs.

A better approach would be to save the PID when you start the process:

1> P = spawn(fun() -> receive _ -> ok end end).
<0.34.0>
2> P!hi.
hi

回答2:

(emacs@yus-iMac.local)100> P = list_to_pid("<0.39.0>").
<0.39.0>
(emacs@yus-iMac.local)101> P!aaa.
aaa

回答3:

Besides other solution,REGISTER func maybe helpful.

    register(regpid,spawn(fun() -> receive _ ok end end).
    regpid ! msg.

you can send msg to regpid everywhere.

来源：https://stackoverflow.com/questions/14169931/sending-message-pid-erlang