Date: Fri, 23 Nov 2012 11:48:59 -0800 From: Garrett Cooper <yanegomi@gmail.com> To: Oleksandr Tymoshenko <gonzo@bluezbox.com> Cc: arch@freebsd.org Subject: Re: [RFC] sema_wait_sig Message-ID: <CAGH67wS4toXOss=ZLWYn4zoHwzaFF9qg=TMVchGf7a257VSqnQ@mail.gmail.com> In-Reply-To: <E5FE70A7-D2D2-4021-950B-48FD84F11F08@bluezbox.com> References: <E5FE70A7-D2D2-4021-950B-48FD84F11F08@bluezbox.com>
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On Thu, Nov 22, 2012 at 10:12 PM, Oleksandr Tymoshenko
<gonzo@bluezbox.com> wrote:
> Hello,
>
> Is there any particular reason FreeBSD does not have sema_wait_sig
> function? It seems to be easily implementable using cv_wait_sig
> function.
>
> The reason I'm asking is that I'm getting some Linux drivers
> ported to FreeBSD and the code in question relies on semaphores
> and there is no obvious alternative to down_interruptible function.
> I realize that not all approaches to driver development are easily
> mappable from OS to OS but in this case lack of cv_wait_sig seems
> like gap in API. Unless of course there is strong rationale behind it.
There were a bunch of ACKs when John Polstra wanted to do work
add sema_wait_sig, but it looks like the work wasn't completed (or at
least not committed back to FreeBSD proper):
http://unix.derkeiler.com/Mailing-Lists/FreeBSD/arch/2004-06/0074.html
.
HTH,
-Garrett
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