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How can I send a message to process with Erlang? I did start a process and the output shows me that the pid (process identifier) is <0.39.0>. My question is how can I send a message to this process (<0.39.0>) manually.

2240
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scof007
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3 Answers3

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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
Thanos Tintinidis
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(emacs@yus-iMac.local)100> P = list_to_pid("<0.39.0>").
<0.39.0>
(emacs@yus-iMac.local)101> P!aaa.
aaa
Chen Yu
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Besides other solution,REGISTER func maybe helpful.

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

you can send msg to regpid everywhere.

liuyang1
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