From: "Vineet Gupta" <vineetg76@gmail.com>
To: "Chris Snook" <csnook@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Usage semantics of atomic_set ( )
Date: Sat, 12 Jan 2008 10:36:57 -0800 [thread overview]
Message-ID: <9f4f8abe0801121036gfdc14fctdbcc075ac6ae91c4@mail.gmail.com> (raw)
In-Reply-To: <478819EA.2080905@redhat.com>
> 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
prev parent reply other threads:[~2008-01-12 18:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-11 22:57 Vineet Gupta
2008-01-11 23:16 ` Roland Dreier
2008-01-12 1:37 ` Chris Snook
2008-01-12 18:36 ` Vineet Gupta [this message]
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