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Enable thread::hardware_concurrency() to handle more than 64 processors #5459

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Merged
merged 15 commits into from
May 10, 2025
+52 −3
Merged

Enable thread::hardware_concurrency() to handle more than 64 processors #5459

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f6a5f91
Fix #5453 to enable handling of over 64 processors
YexuanXiao May 2, 2025
968f5d1
Use GetLogicalProcessorInformationEx
YexuanXiao May 3, 2025
c8f3af4
Add missing header files
YexuanXiao May 3, 2025
66016db
Align the stack buffer and add noexcept to the lambda
YexuanXiao May 3, 2025
27fc44e
Use the #error directive to report unknown architectures
YexuanXiao May 3, 2025
924ea74
Consistency: `std::` => `_STD`
StephanTLavavej May 8, 2025
3494728
Directly test the `BOOL` returned by `GetLogicalProcessorInformationEx`.
StephanTLavavej May 8, 2025
dad053a
Drop comment about the size of `Mask`; `popcount` handles this.
StephanTLavavej May 8, 2025
0cf6aa2
Detect 64-bit / 32-bit variation with `_WIN64`.
StephanTLavavej May 8, 2025
c9e6c96
Restructure control flow with a loop instead of a lambda.
StephanTLavavej May 8, 2025
2f05336
`buffer` => `stack_buffer`
StephanTLavavej May 8, 2025
da4724c
`count` => `logical_processors`
StephanTLavavej May 8, 2025
06b7eae
Handle multiple sockets.
StephanTLavavej May 8, 2025
29bb4fe
Add comments.
StephanTLavavej May 8, 2025
c4c52f0
Fix the ARM64EC internal build.
StephanTLavavej May 9, 2025
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4 changes: 1 addition & 3 deletions stl/src/cthread.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -103,9 +103,7 @@ _CRTIMP2_PURE _Thrd_id_t __cdecl _Thrd_id() noexcept { // return unique id for c
}

_CRTIMP2_PURE unsigned int __cdecl _Thrd_hardware_concurrency() noexcept { // return number of processors
SYSTEM_INFO info;
GetNativeSystemInfo(&info);
return info.dwNumberOfProcessors;
return GetActiveProcessorCount(ALL_PROCESSOR_GROUPS);
}

// TRANSITION, ABI: _Thrd_create() is preserved for binary compatibility
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