[erlang-questions] order-preserving send?
Thu Aug 28 01:57:36 CEST 2008
On Wednesday, August 27, atomly wrote:
> [Bill McKeeman <Bill.McKeeman@REDACTED>]
> > Simple newbie question. Suppose I have a process id U, and send two
> > messages
> > U ! Message1.
> > U ! Message2.
> > Is there a guarantee that the messages will be received in the order
> > they were sent?
> No. There's not even a guarantee that both (or either) messages will be
That misleading and, for practical purposes, wrong.
>From the FAQ:
| 10.9 Is the order of message reception guaranteed?
| Yes, but only within one process.
| If there is a live process and you send it message A and then message
| B, it's guaranteed that if message B arrived, message A arrived before
| On the other hand, imagine processes P, Q and R. P sends message A to
| Q, and then message B to R. There is no guarantee that A arrives
| before B. (Distributed Erlang would have a pretty tough time if this
| was required!)
The next question is also relevant:
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