Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20150414231627.GR6817@brightrain.aerifal.cx>
Date: Tue, 14 Apr 2015 19:16:27 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] Use CAS instead of atomic swap to implement
 spinlock

On Wed, Apr 15, 2015 at 01:44:53AM +0300, Alexander Monakov wrote:
> This should allow spinning without constantly dirtying cache lines holding the
> spinlock value.  On architectures without native atomic swap, musl implement
> a_swap by looping around a_cas.

It won't help on x86, where all lock-prefixed ops perform both a read
and a write even if they fail. But it should help in ll/sc style
archs, and shouldn't hurt on x86.

Rich

Powered by blists - more mailing lists

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.