优先处理 Erlang 消息，也称为选择性接收

Question

我有一个进程代码，我想发一个'die'问题来杀掉它。但我想确保每次 kill 消息都被优先处理，所以如果有一个 - 进程将立即死亡。

receive 
 die -> dead;
after
0 -> receive
      Message -> do_something(Message)
    after
    0 -> func(NewX)
    end
end.

Answer 1

使用您的代码，您正在忙着等待，您可以执行以下操作：

func(X) ->
    receive % This checks the whole mailbox for 'die'
        die -> dead; 
    after 0 -> % No 'die' message in mailbox, process the next Message whenever it arrives
        receive % This checks only the next Message in the mailbox
            die -> dead;
            Message -> func(do_something(X, Message))
        end
    end.

优先处理 Erlang 消息，也称为选择性接收

Process message prioritizing Erlang, also known as Selective Receives

erlang