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lukebakken/ruh-roh.md

Last active April 6, 2017 18:01
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Erlang Gotcha
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ruh-roh.md

What could go wrong here?

receiver() ->
    receive
        {first, Msg} ->
            io:format("receiver first ~s~n", [Msg]),
            receive
                {second, Msg} ->
                    io:format("receiver second ~s~n", [Msg]);
                stop ->
                    io:format("receiver inner STOP~n")
            end;
        stop ->
            io:format("receiver outer STOP~n")
    end,
    receiver().

Consider this input:

Pid ! {second, "ex3_1 second"},
Pid ! {first, "ex3_1 first"},
Pid ! stop
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