From: Andi Kleen <ak@suse.de>
To: Andi Kleen <ak@suse.de>,
William Lee Irwin III <wli@holomorphy.com>,
linux-arch@vger.kernel.org
Subject: Re: sem_is_locked()
Date: Wed, 22 Sep 2004 13:51:03 +0200 [thread overview]
Message-ID: <20040922115103.GB27432@wotan.suse.de> (raw)
In-Reply-To: <20040922123552.A2347@flint.arm.linux.org.uk>
On Wed, Sep 22, 2004 at 12:35:52PM +0100, Russell King wrote:
> On Wed, Sep 22, 2004 at 01:26:53PM +0200, Andi Kleen wrote:
> > On Wed, Sep 22, 2004 at 04:11:39AM -0700, William Lee Irwin III wrote:
> > > hch and some others (e.g. moi) trying to do vfs sweeps would very much
> > > like to have a sem_is_locked() to assist them; by any chance could arch
> > > maintainers help out with implementing this for various arches?
> >
> > On x86-64/i386 and probably most other architectures it is just
> > atomic_read(&sem->count) <= 0
>
> Obviously, generic code should not assume that a semaphore is
> implemented using atomic_t.
Sure, but with that fact it's pretty easy to implement the macro
wli wants for most architectures.
-Andi
next prev parent reply other threads:[~2004-09-22 11:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-22 11:11 sem_is_locked() William Lee Irwin III
2004-09-22 11:14 ` sem_is_locked() Matthew Wilcox
2004-09-22 11:26 ` sem_is_locked() Andi Kleen
2004-09-22 11:35 ` sem_is_locked() Russell King
2004-09-22 11:51 ` Andi Kleen [this message]
2004-09-22 11:58 ` sem_is_locked() William Lee Irwin III
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