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What are all the differences between pipes and message queues?

Asked 2010-03-18T14:42:05.957
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What are all the differences between pipes and message queues?

Please explain both from vxworks & unix perspectives.

I think pipes are unidirectional but message queues aren't.

But don't pipes internally use message queues, then how come pipes are unidirectional but message queues are not?

What are the other differences you can think of (from design or usage or other perspectives)?

unix ipc message-queue pipe vxworks
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"VxWorks pipes differ significantly from UNIX pipes", says the vxWorks documentation, and they ain't kidding. Here's the manpages.

It looks like it would not be exaggerating much to say that the only similarity between Unix pipes and vxWorks pipes are that they're a form of IPC. The features are different, the APIs are different, and the implementations are surely very different.

answered 2010-03-20T04:01:17.667

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