Date: Thu, 7 Dec 2000 17:19:53 -0500 (EST) From: Daniel Eischen <eischen@vigrid.com> To: Jason Evans <jasone@canonware.com> Cc: Dan Eischen <eischen@vigrid.com>, smp@freebsd.org Subject: Re: Userland atomic assignments Message-ID: <Pine.SUN.3.91.1001207171540.10405A-100000@pcnet1.pcnet.com> In-Reply-To: <20001207140746.O2312@canonware.com>
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On 7 Dec 2000, Jason Evans wrote: > On Thu, Dec 07, 2000 at 04:15:05PM -0500, Dan Eischen wrote: > > What kind of atomic operations can we get in userland? > > If I have a singly linked list, where nodes are only added > > to the head or the tail and they are never removed, can I > > walk the list without fear of catching a bad head or > > node->next (when I'm at the end of the list) pointer? > > > > In other words, can I get an atomic_set_ptr() operation > > on each platform? I can also see the need for an > > atomic_set_int32() operation. > > I don't think we have an official API for atomic operations in userland. > There is <machine/atomic.h>, but it isn't documented as a userland API. I > agree that we need this or something similar in userland though. Any ideas > on the cleanest way to provide this? Something along the lines of <machine/atomic.h> I'd guess. I don't need compare and set, nor anything that complicated, just a couple of atomic store operations. I'm finding some places in libc that could really use an atomic_store_ptr(). -- Dan Eischen To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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