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Date: Mon, 03 Sep 2007 08:12:40 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] Down interruptible
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To: Iwan Budi Kusnanto <iwanbk@domain.hid>
Cc: xenomai@xenomai.org

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Iwan Budi Kusnanto wrote:
> Hello all
> why rt_sem_p does not have behaviour like down_interruptible (that
> receive a signal while being blocked on a semaphore to give up the
> "down"/"p" operation).Is that a bad design?
> sem_wait (posix skin)have behaviour like that.

rt_sem_p() does have the desired property. If you observed anything
different in practice, it would be a bug and we would be happy to hear
more details (used versions, testcase code, etc.).

Just note that signal delivery breaks the determinism of the target
application.

>=20
> In what situation we must use posix skin?
> In what situation we must use native skin?

There are no technical reasons to pick any of them, it's purely a design
question of your application (/me being in hurry and can't go into
details ATM).

Jan


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