[erlang-questions] [Q] erlang:check_process_code/2

Bjorn Gustavsson <>
Thu Apr 17 16:50:08 CEST 2008

Ladislav Lenart <> writes:

> Hello,
> I think I run into trouble with code purge/delete machinery. To solve
> this puzzle, I need to understand how erlang:check_process_code/2
> works. Could anyone please tell me under which circumstances this
> function returns true? I know that it is "when a process is executing
> old code" but what does that really mean (for example, what if the
> process references a Fun from that module,...)?

Yes, if a fun references old code, erlang:check_process_code/2 will
return true.

Björn Gustavsson, Erlang/OTP, Ericsson AB

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