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Date: Sun, 29 May 2011 09:04:00 -0000
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Subject: Re: [v3] define std::thread::hardware_concurrency()
From: Jonathan Wakely <jwakely.gcc@gmail.com>
To: "libstdc++" <libstdc++@gcc.gnu.org>, gcc-patches <gcc-patches@gcc.gnu.org>
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On 28 May 2011 01:43, Jonathan Wakely wrote:
> This patch uses glibc's get_nprocs() or the non-standard but widely
> available _SC_NPROCESSORS_ONLN sysconf variable to determine the
> number of processors.
>
> 2011-05-28 =A0Jonathan Wakely =A0<jwakely.gcc@gmail.com>
>
> =A0 =A0 =A0 =A0* acinclude.m4: Define GLIBCXX_CHECK_GET_NPROCS and
> =A0 =A0 =A0 =A0GLIBCXX_CHECK_SC_NPROCESSORS_ONLN.
> =A0 =A0 =A0 =A0* configure.ac: Use them. Increase minor version.
> =A0 =A0 =A0 =A0* configure: Regenerate.
> =A0 =A0 =A0 =A0* config.h.in: Regenerate.
> =A0 =A0 =A0 =A0* include/std/thread (thread::hardware_concurrency): Remov=
e inline
> =A0 =A0 =A0 =A0definition.
> =A0 =A0 =A0 =A0* src/thread.cc (thread::hardware_concurrency): Define.
> =A0 =A0 =A0 =A0* config/abi/pre/gnu.ver: Export new symbol @3.4.17
> =A0 =A0 =A0 =A0* testsuite/util/testsuite_abi.cc: Add new version.
> =A0 =A0 =A0 =A0* testsuite/lib/libstdc++.exp (check_v3_target_nprocs): Ad=
d.
> =A0 =A0 =A0 =A0* testsuite/lib/dg-options.exp (dg-require-nprocs): Add.
> =A0 =A0 =A0 =A0* testsuite/30_threads/thread/members/hardware_concurrency=
.cc: Use
> =A0 =A0 =A0 =A0dg-require-nprocs and verify hardware_concurrency returns =
non-zero.
>
>
> Tested x86_64-linux, I intend to commit to trunk tomorrow.

I've checked that patch in, so the library version on mainline is
libstdc++.so.6.0.17 now.

If my configury changes or using sysconf breaks anything I'll try to
fix it asap.