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Re: PATCH: Always use ll/sc for mips

To: "Maciej W. Rozycki" <>
Subject: Re: PATCH: Always use ll/sc for mips
From: "H. J. Lu" <>
Date: Tue, 16 Jul 2002 08:42:08 -0700
Cc: Ulrich Drepper <>,, GNU C Library <>
In-reply-to: <>; from on Tue, Jul 16, 2002 at 05:22:36PM +0200
References: <1026781165.3673.11.camel@myware.mynet> <>
User-agent: Mutt/
On Tue, Jul 16, 2002 at 05:22:36PM +0200, Maciej W. Rozycki wrote:
> On 15 Jul 2002, Ulrich Drepper wrote:
> > > The ll/sc emulation is implemented in 2.4.0 and above. This patch makes
> > > glibc always use ll/sc.
> > 
> > Since I haven't seen any objections I've checked this patch in.
>  [I must have missed the original mail, sorry.]
>  It sucks performance-wise with no visible gain, so I don't think it is
> really desireable.  Since the no-ll/sc case is handled correctly, I see no

Only <sys/tas.h> is covered by the kernel interface. But it doesn't
cover atomicity.h in glibc and libstdc++.

> reason to remove the code.  The kernel interface is awkward, I admit, but
> it works (and is even handcoded in assembly for performance gain) and we
> may able to develop a better one eventually.


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