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Reorg second paragraph too, to group related info together.

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dholland 2014-02-02 17:32:38 +00:00
parent 61bb893049
commit 74b6f13039
1 changed files with 6 additions and 10 deletions
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16
lib/libc/atomic/atomic_cas.3
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@ -1,4 +1,4 @@
.\" $NetBSD: atomic_cas.3,v 1.3 2014/02/02 17:30:06 dholland Exp $
.\" $NetBSD: atomic_cas.3,v 1.4 2014/02/02 17:32:38 dholland Exp $
.\"
.\" Copyright (c) 2007, 2010 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -100,15 +100,11 @@ The non-interlocked variants,
.Fn *_ni ,
guarantee atomicity within the same CPU with respect to
interrupts and preemption.
For example, they are suitable for synchronizing compare-and-swap
operations on a variable shared by a thread and an interrupt
that are bound to the same CPU.
The
.Fn *_ni
variants are not atomic with respect to different CPUs.
.Fn *_ni
variants should avoid the interprocessor synchronization overhead
of the standard compare-and-swap operations.
They are not atomic with respect to different CPUs.
These can be used to avoid interprocessor synchronization overhead
in some cases; for example, they are suitable for synchronized
operations on a variable shared by a thread and an interrupt that are
bound to the same CPU.
.Pp
The 64-bit variants of these functions are available only on platforms
that can support atomic 64-bit memory access.