Erlang has selective receive, meaning it will go through all your receive branches in order, until one matches. With this code: receive {high_p, M

Erlang has selective receive, meaning it will go through all your receive branches in order, until one matches. With this code: receive {high_p, Message} -> process_high(Message); {low_p, Message} -> process_low(Message) end if the process has one high_p message and a low_p message, the high_p message will be processed first.