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Re: [PATCH] Unify pthread_spin_[try]lock implementations.

From: Jeff Law <law at redhat dot com>
To: Roland McGrath <roland at hack dot frob dot com>
Cc: Maxim Kuvyrkov <maxim at codesourcery dot com>, Andrew Haley <aph at redhat dot com>, David Miller <davem at davemloft dot net>, "Joseph S. Myers" <joseph at codesourcery dot com>, Richard Sandiford <rdsandiford at googlemail dot com>, libc-ports at sourceware dot org, GLIBC Devel <libc-alpha at sourceware dot org>, Chris Metcalf <cmetcalf at tilera dot com>
Date: Wed, 15 Aug 2012 11:24:18 -0600
Subject: Re: [PATCH] Unify pthread_spin_[try]lock implementations.
References: <Pine.LNX.4.64.1206282306320.20312@digraph.polyomino.org.uk> <65B470D2-4D01-4BA1-AEC5-A72C0006EA22@codesourcery.com> <20120711081441.73BB22C093@topped-with-meat.com> <20120711.012509.1325789838255235021.davem@davemloft.net> <4FFD3CD9.4030206@redhat.com> <84304C03-6A49-4263-9016-05486EDC0E98@codesourcery.com> <4FFD4114.9000806@redhat.com> <E1DB09C1-0E3E-4088-9793-C0CAB80B5084@codesourcery.com> <20120711112235.B28CA2C099@topped-with-meat.com> <7FBB4F87-9FF3-4239-818F-5A38C8094011@codesourcery.com> <20120725181300.DD1812C0B5@topped-with-meat.com> <36A2FFD8-0C98-4AB6-8C64-2EEC5CC67A63@codesourcery.com> <20120815162637.B74982C0F2@topped-with-meat.com> <BE128C9A-CABC-4E04-A48E-316EAE8E0C64@codesourcery.com> <502BD690.50501@redhat.com> <20120815171042.D94E52C0D2@topped-with-meat.com>

On 08/15/2012 11:10 AM, Roland McGrath wrote:

It seems to me that SPIN_LOCK_READS_BETWEEN_CMPXCHG may have the
property that varying it at runtime based on the characteristics of the
particular chip running the application might be worthwhile.


Nothing prevents a machine from defining the macro to use a global variable
that is set by some machine-specific initialization code.

Understood. Just wanted to raise the issue. No pressing need to resolve it now, but it's on Red Hat's radar and now it's on the community's radar :-)

jeff

References:
- Re: [PATCH] Unify pthread_spin_[try]lock implementations.
  - From: Maxim Kuvyrkov
- Re: [PATCH] Unify pthread_spin_[try]lock implementations.
  - From: Roland McGrath
- Re: [PATCH] Unify pthread_spin_[try]lock implementations.
  - From: Maxim Kuvyrkov
- Re: [PATCH] Unify pthread_spin_[try]lock implementations.
  - From: Jeff Law
- Re: [PATCH] Unify pthread_spin_[try]lock implementations.
  - From: Roland McGrath

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