From: Nick Garnett <nickg@cygnus.co.uk>
To: ecos-discuss@sourceware.cygnus.com
Subject: Re: [ECOS] No binary semaphore in C API?
Date: Mon, 26 Mar 2001 03:53:00 -0000 [thread overview]
Message-ID: <wwghf0glpyc.fsf@balti.cambridge.redhat.com> (raw)
In-Reply-To: <3AB67D44.AFB5E10D@redhat.com>
Jonathan Larmour <jlarmour@redhat.com> writes:
> Grant Edwards wrote:
> >
> > So, I wanted to use binary semaphores, but can't find the API.
> > The program is using counting semaphores right now, but using a
> > binary ones would be a bit more "defensive".
> >
> > Is there a technical reason that there isn't a C API for binary
> > semaphores, or is it something that just hasn't been done yet?
>
> Certainly no technical reason. Nick may not have done it out of principle.
> But right now he's on vacation, so it's best to wait till he returns.
>
It was never intended that the KAPI be a complete reflection of the
kernel implementation. It is meant to be a consistent, self-contained,
small API that can be used by C applications. Like the uITRON and
POSIX APIs it only exposes a subset. It was considered unnecessary to
export binary semaphores, since a counting semaphore initialized to 1
is functionally equivalent.
If I had had my way the KAPI would have been even more minimal that it
currently is.
--
Nick Garnett, eCos Kernel Architect
Red Hat, Cambridge, UK
next prev parent reply other threads:[~2001-03-26 3:53 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-16 12:01 Grant Edwards
2001-03-19 13:42 ` Jonathan Larmour
2001-03-26 3:53 ` Nick Garnett [this message]
2001-03-26 7:12 ` Fabrice Gautier
2001-03-26 11:37 ` Grant Edwards
2001-03-27 2:00 ` Nick Garnett
2001-03-27 5:32 ` Grant Edwards
2001-03-28 5:29 ` Bart Veer
2001-03-28 6:45 ` Sergei Organov
2001-03-28 7:38 ` Grant Edwards
2001-03-28 7:39 ` Bart Veer
2001-03-28 10:01 ` Jonathan Larmour
2001-03-28 10:01 ` Sergei Organov
2001-03-28 11:05 ` Grant Edwards
2001-03-29 11:51 ` Sergei Organov
2001-03-29 11:49 ` Grant Edwards
2001-03-29 11:55 ` Chris Gray
2001-03-29 19:33 ` Bart Veer
2001-03-29 20:50 ` Grant Edwards
2001-03-30 2:22 ` Sergei Organov
2001-03-30 6:54 ` Grant Edwards
2001-03-30 7:42 ` Sergei Organov
2001-03-30 5:39 Rosimildo daSilva
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