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Re: Shared mutex pool

From: Jonathan Wakely <jwakely at redhat dot com>
To: François Dumont <frs dot dumont at gmail dot com>
Cc: "libstdc++ at gcc dot gnu dot org" <libstdc++ at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Mon, 3 Oct 2016 11:29:11 +0100
Subject: Re: Shared mutex pool
Authentication-results: sourceware.org; auth=none
References: <b3e6eb84-402c-bb87-140a-e24800ef3fa2@gmail.com>

On 28/09/16 21:34 +0200, François Dumont wrote:

Hi
Here is the patch to share a mutex pool between debug mode andshared_ptr implementation. It saves 392 bytes on generated .so andwill make sure that fixing false sharing will impact both usages.
I preferred to leave implementation in shared_ptr.cc to avoidintroducing another translation unit.
   * src/c++11/shared_ptr.cc (mask, invalid, get_mutex): Move
   declaration...
   * src/c++11/mutex_pool.h: ... here. New.
   * src/c++11/debug.cc: Use latter.

   Tested under Linux x86_64, normal and debug modes.

Ok to commit ?


OK, thanks.

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