Introducing Erlang: Getting Started in Functional Programming by Simon St. Laurent

Author:Simon St. Laurent [Laurent, Simon St.]
Language: eng
Format: azw3, pdf
Publisher: O'Reilly Media
Published: 2017-03-06T05:00:00+00:00

1> Pid1=spawn(bounce,report,[1]). <0.33.0> 2> register(bounce,Pid1). true 3> bounce ! hello. Received #1: hello hello ok 4> bounce ! "Really?". Received #2: "Really?" "Really?" ok

If you attempt to call a process that doesn’t exist (or one that has crashed), you’ll get a bad argument error:

6> zingo ! test. ** exception error: bad argument in operator !/2 called as zingo ! test

If you attempt to register a process to a name that is already in use, you’ll also get an error, but if a process has exited (or crashed), the name is effectively no longer in use and you can re-register it.

You can also use whereis/1 to retrieve the pid for a registered process (or undefined, if there is no process registered with that atom), and unregister/1 to take a process out of the registration list without killing it:

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