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Re: Fwd: [PATCH] spinlock spin with pause instruction

From: Mark Geisert <mark at maxrnd dot com>
To: cygwin-patches at cygwin dot com
Date: Fri, 11 Mar 2016 22:25:56 -0800
Subject: Re: Fwd: [PATCH] spinlock spin with pause instruction
Authentication-results: sourceware.org; auth=none
References: <CAKw7uVgrjqZVznRMoCbsjyz4YXast5YtAAmpWQorOw7YXqbOhw at mail dot gmail dot com> <CAKw7uVg78t2V8KKLYfPyhb97XjU+aUb4KV-poz7i_wwDeJ6b=g at mail dot gmail dot com>

Václav Haisman wrote:

Hi.

I have noticed that Cygwin's spinlock goes into heavy sleeping code
for each spin. It seems it would be a good idea to actually try to
spin a bit first. There is this 'pause' instruction which let's the
CPU make such busy loops be less busy. Here is a patch to do this.

I wanted to try out this patch but compilation is failing on the "unlikely"call. Is that a macro that needs defining or something else?

Thanks,

..mark

Follow-Ups:
- Re: Fwd: [PATCH] spinlock spin with pause instruction
  - From: VÃclav Haisman

References:
- Fwd: [PATCH] spinlock spin with pause instruction
  - From: VÃclav Haisman

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