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Elaborate a bit more in the first paragraph.

This commit is contained in:
thorpej 2007-03-09 07:13:06 +00:00
parent 7a35085f7e
commit 0eddebcf62
1 changed files with 4 additions and 3 deletions
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7
sys/arch/arm/include/mutex.h
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@ -1,4 +1,4 @@
/* $NetBSD: mutex.h,v 1.4 2007/03/09 07:11:10 thorpej Exp $ */
/* $NetBSD: mutex.h,v 1.5 2007/03/09 07:13:06 thorpej Exp $ */
/*-
* Copyright (c) 2002, 2007 The NetBSD Foundation, Inc.
@ -40,9 +40,10 @@
#define _ARM_MUTEX_H_
/*
* The ARM mutex implementation is troublesome, because ARM (< v6) lacks a
* The ARM mutex implementation is troublesome, because pre-v6 ARM lacks a
* compare-and-set operation. However, there aren't any MP pre-v6 ARM
* systems to speak of.
* systems to speak of. We are mostly concerned with atomicity with respect
* to interrupts.
*
* SMP for spin mutexes is easy - we don't need to know who owns the lock.
* For adaptive mutexes, we need an aditional interlock.