Date: Mon, 23 Oct 2017 10:28:22 -0600 From: Ian Lepore <ian@freebsd.org> To: Konstantin Belousov <kib@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r324926 - head/share/man/man9 Message-ID: <1508776102.34364.7.camel@freebsd.org> In-Reply-To: <201710231614.v9NGEtuP036360@repo.freebsd.org> References: <201710231614.v9NGEtuP036360@repo.freebsd.org>
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On Mon, 2017-10-23 at 16:14 +0000, Konstantin Belousov wrote: > Author: kib > Date: Mon Oct 23 16:14:55 2017 > New Revision: 324926 > URL: https://svnweb.freebsd.org/changeset/base/324926 > > Log: > Expand explanation of atomicity. > > Mention per-location total order, out of thin air, and torn writes > guarantees. Mention C11 standard' memory model and one most important > FreeBSD additional requirement, that is aligned ordinary loads and > stores are atomic on processors. > > [...] > > +On all architectures supported by > +.Fx , > +ordinary loads and stores of naturally aligned integer types > +are atomic, as executed by the processor. This is not true on arm{v6,v7}. 64-bit integer types can be atomically loaded and stored with the appropriate functions from atomic.h, but are not ordinarily so, regardless of alignment. Smaller integer types do meet this requirement. -- Ian
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