linux-kernel - Re: Usage semantics of atomic

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Message-ID: <9f4f8abe0801121036gfdc14fctdbcc075ac6ae91c4@mail.gmail.com>
Date:	Sat, 12 Jan 2008 10:36:57 -0800
From:	"Vineet Gupta" <vineetg76@...il.com>
To:	"Chris Snook" <csnook@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Usage semantics of atomic_set ( )

> What operations are you using to implement spinlocks?

The cpu provides atomic exchange instruction (atomic Read/write
semantics) which forms the back end of spin lock code.
__raw_spin_trylock( ) atomically swaps the lock memory with a reg (set
to 1)

Using a pool of spinlocks rather that original idea of spinlock per
atomic_t anyways seems to be a better idea.
I really appreciate the responses. Thanks a lot

-Vineet
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