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[libc++][Windows] Enable thread::hardware_concurrency to support more than 64 processors #168229

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Merged
frederick-vs-ja merged 1 commit into from
Nov 21, 2025
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[libc++][Windows] Enable thread::hardware_concurrency to support more than 64 processors #168229

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4 changes: 1 addition & 3 deletions libcxx/src/thread.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -74,9 +74,7 @@ unsigned thread::hardware_concurrency() noexcept {
return 0;
return static_cast<unsigned>(result);
#elif defined(_LIBCPP_WIN32API)
SYSTEM_INFO info;
GetSystemInfo(&info);
return info.dwNumberOfProcessors;
return static_cast<unsigned>(GetActiveProcessorCount(ALL_PROCESSOR_GROUPS));
#else // defined(CTL_HW) && defined(HW_NCPU)
// TODO: grovel through /proc or check cpuid on x86 and similar
// instructions on other architectures.
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