Function GetLogicalProcessorCountInWindows

src/misc/sysos.cpp:25–55

#if !defined(_M_ARM64)
        int GetLogicalProcessorCountInWindows() {
            DWORD returnLength = 0;
            vector<unsigned char> buffer;
            PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX info = nullptr;
            // First, call to get the size of the data needed.
            GetLogicalProcessorInformationEx(RelationAll, NULL, &returnLength);
            buffer.resize(returnLength);
            // Now retrieve the data.
            if (GetLogicalProcessorInformationEx(RelationAll, reinterpret_cast<SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *>(buffer.data()), &returnLength)) {
                int logicalProcessorCount = 0;
                DWORD offset = 0;
                // Parse the returned buffer for processor information
                while (offset < returnLength) {
                    info = reinterpret_cast<SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *>(buffer.data() + offset);
                    if (info->Relationship == RelationProcessorCore) {
                        // For each core, count the number of set bits in the GroupMask
                        for (int i = 0; i < info->Processor.GroupCount; ++i) {
                            auto mask = info->Processor.GroupMask[i].Mask;
                            // Count bits set to 1 in the processor mask
                            while (mask) {
                                logicalProcessorCount += (mask & 1);
                                mask >>= 1;
                            }
                        }
                    }
                    offset += info->Size;
                }
                return logicalProcessorCount;
            }
            return 0;
        }

        bool g_isVHSet = false;
        void ( * g_HwBpHandler ) ( int, void * ) = nullptr;