mrcly
Run TCP client in a background/non-blocking process
Hi,
i am running a TCP client using gen_tcp inside a GenServer, which is called by DynamicSupervisor using Supervisor.start_client(). Whenever I call this method, the output (which is logged with IO.puts) is blocking the REPL. I start the application via iex -S mix. In the future, it is planned to execute some actions when a specific message is received via TCP, but that’s not implemented currently. However, I need to perform multiple TCP-clients at once and after calling Supervisor.start_client() once, the REPL is blocked and another TCP client cant be spawned.
How can I run this TCP-Client in a background/non-blocking process?
Thanks in advance.
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evadne
Do not do the work in init/1. Init is supposed to return quickly. Instead use continuation. See GenServer — Elixir v1.11.4. Return {:ok, state, {:continue, continue}} in your init/1 callback and continue your setup / whatever other sort of blocking operation in handle_continue/2.
entone
Yeah, without seeing your client code, it’s hard to say why it would be blocking. Even a long running init callback shouldn’t block indefinitely.
My guess would be that your making a blocking call from within your init callback.
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