Designing for Scalability with ErlangOTP by Francesco Cesarini

Author:Francesco Cesarini
Language: eng
Format: epub
Publisher: O'Reilly Media
Published: 2016-05-27T00:00:00+00:00

Basic template for starting a special process

The recommended approach to starting a special process is to use the proc_lib:start_link(Mod, Fun, Args) call instead of the spawn_link/3 BIF. Given a module, a function, and a list of arguments, it synchronously spawns a process and waits for this process to notify that it has correctly started through the proc_lib:init_ack(Value) call. Value is sent back to the parent process, becoming the return value of the start_link/3 call. Note how we are passing optional DbgOpts debug option parameters in our start_link call. We covered them in Chapter 5. For now, assume DbgOpts is an empty list. Note also how we are passing the Parent process ID to the init/3 function; we need it in our main loop. It is the result of the self() BIF in the start_link/2 call.

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