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Does the following function block on its running core?
wait(Sec) ->
receive
after (1000 * Sec) -> ok
end.
A great answer will detail the internal working of Erlang and/or the CPU.
The process which executes that code will block, the scheduler which runs that process currently will not block. The code you posted is equal to a yield, but with a timeout.
The Erlang VM scheduler for that core will continue to execute other processes until that timeout fires and that process will be scheduled for execution again.