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Re: implementation of std::thread::hardware_concurrency()

From: Mike Stump <mikestump at comcast dot net>
To: Jonathan Wakely <jwakely dot gcc at gmail dot com>
Cc: niXman <i dot nixman at gmail dot com>, libstdc++ at gcc dot gnu dot org, gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Tue, 1 Nov 2011 10:06:02 -0700
Subject: Re: implementation of std::thread::hardware_concurrency()
References: <CAMPTgK2Fph+jQBtKQ+nHa7+BMdUCu=zT3dWaUO0pc7z=Xg8mWg@mail.gmail.com> <0223B132-51E6-4B54-8C2D-0EC690A5E9E0@oracle.com> <CAMPTgK0dyW0uP03vmOJ4N53vk0NwbFOgirGFqwz7wD2SFZhE_A@mail.gmail.com> <alpine.DEB.2.02.1111011251120.7409@laptop-mg.saclay.inria.fr> <CAMPTgK1HA3dXodt53hg7tAfB8brQpzQTyFC1ConFQ0X4xjM3xQ@mail.gmail.com> <CAH6eHdSorga8wBaLSeTFzZZ-r4mi-j7k39EG_qwKTkT4cQNTnA@mail.gmail.com> <CAH6eHdSdKetFrk81JPB5pG+RQb_gYAzcvJm1u71eyCSUvQF4CA@mail.gmail.com> <CAH6eHdQ8pnvHJNxx9NephOc_-rdYts6cUzXEqFoSfXpoQsbAEQ@mail.gmail.com>

On Nov 1, 2011, at 8:55 AM, Jonathan Wakely wrote:
> Is there a reason you used "hw.ncpu" not the constant HW_NCPU ?

I suspect on some systems, this would be a runtime value....  so, no fixed constant could ever work.

Follow-Ups:
- Re: implementation of std::thread::hardware_concurrency()
  - From: Jonathan Wakely

References:
- Re: implementation of std::thread::hardware_concurrency()
  - From: niXman
- Re: implementation of std::thread::hardware_concurrency()
  - From: Marc Glisse
- Re: implementation of std::thread::hardware_concurrency()
  - From: niXman
- Re: implementation of std::thread::hardware_concurrency()
  - From: Jonathan Wakely
- Re: implementation of std::thread::hardware_concurrency()
  - From: Jonathan Wakely
- Re: implementation of std::thread::hardware_concurrency()
  - From: Jonathan Wakely

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