EUC 2006: Erlang Message Receive Fundamentals (3 of 3)

EUC 2006: Erlang Message Receive Fundamentals

Nov 8, 2006

Proposal for a Second Message Queue

Out of band communication not possible now
Propose having a 2nd message queue

Pid ! Msg delivers to the Data queue
Pid !@ Msg delivers to the Control queue
receive can match either queue

        receive
          {high_priority, ControlMsg1} ->> received_control_msg1;
          DataMsg -> received_data_msg;
          {low_priority, ControlMsg2} ->> received_control_msg2
        end

Pause and resume would not require unloading message queue
Priority messages could be handled easily in one process
The proposal is backwards compatible
Implementation replicates the existing functionality
Debate will continue on the erlang-questions mail list

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