[erlang-questions] Why use send_after to send a message is reverse?

Jesper Louis Andersen jesper.louis.andersen@REDACTED
Tue Jun 9 15:25:57 CEST 2015

On Tue, Jun 9, 2015 at 1:32 PM, Dao Gui <guidao1013@REDACTED> wrote:

> this output is:
> dddd:2
> dddd:1

Not always!

Suppose we have:

                erlang:send_after(1000,Pid, 1),
                timer:sleep(1), %% Simulate that we get broken here and
other work has to be carried out

Then the answer is


In other words, you better not rely on messages sent in the same time slot
have the same ordering every time around. In R18, with multiple timer
wheels, the situation is even more nondeterministic.

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