[libcxx] r185451 - Windows support in thread::hardware_concurrency.
ofv at wanadoo.es
Tue Jul 2 14:55:47 PDT 2013
Nico and Howard,
Nico Rieck <nico.rieck at gmail.com> writes:
> On 02.07.2013 19:53, Howard Hinnant wrote:
>> +#elif defined(_WIN32)
>> + SYSTEM_INFO info;
>> + GetSystemInfo(&info);
>> + return info.dwNumberOfProcessors;
>> #else // defined(CTL_HW) && defined(HW_NCPU)
> I'm not that familiar with the implementation for the other platforms,
> but this snippet returns the number of logical processors. In my local
> Windows port I use the number of cores, as I think that's more
> appropriate. This is also what MSVCRT does on Windows.
As per my interpretation of the standard, returning the number of
logical processors is the right thing.
I checked VS2013 on a hyperthreaded machine and
std::thread::hardware_concurrency does just that. Same for
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