| 24 | } |
| 25 | |
| 26 | bool getProcessorInfoFromOS(int& cpus, int& cores, int& logicalCores, double& clockSpeed) |
| 27 | { |
| 28 | cpus = 0; |
| 29 | cores = 0; |
| 30 | logicalCores = 0; |
| 31 | clockSpeed = 0; |
| 32 | |
| 33 | // Clock speed |
| 34 | HKEY hKey; |
| 35 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT("HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0"), 0, KEY_EXECUTE, &hKey) == ERROR_SUCCESS) { |
| 36 | DWORD type = REG_DWORD; |
| 37 | DWORD val; |
| 38 | DWORD cbData = sizeof(val); |
| 39 | if (RegQueryValueEx(hKey, TEXT("~MHz"), NULL, &type, (LPBYTE)&val, &cbData) == ERROR_SUCCESS) { |
| 40 | if (type == REG_DWORD && cbData == sizeof(DWORD)) { |
| 41 | clockSpeed = val / 1000.0; |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | } |
| 46 | if (clockSpeed == 0) { |
| 47 | // Can't access registry, try QueryPerformanceFrequency (nearly always same speed as CPU) |
| 48 | LARGE_INTEGER f; |
| 49 | if (!QueryPerformanceFrequency(&f)) { |
| 50 | return false; |
| 51 | } |
| 52 | clockSpeed = f.QuadPart / 1000.0 / 1000.0; |
| 53 | } |
| 54 | |
| 55 | // Everything else |
| 56 | LPFN_GLPI glpi; |
| 57 | glpi = (LPFN_GLPI)GetProcAddress(GetModuleHandle(TEXT("kernel32")), "GetLogicalProcessorInformation"); |
| 58 | if (glpi == NULL) { |
| 59 | return false; |
| 60 | } |
| 61 | |
| 62 | PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL; |
| 63 | DWORD bufferLength = 0; |
| 64 | if (glpi(buffer, &bufferLength) == TRUE) { |
| 65 | return false; |
| 66 | } |
| 67 | |
| 68 | while (GetLastError() == ERROR_INSUFFICIENT_BUFFER) { |
| 69 | if (buffer != NULL) { |
| 70 | std::free(buffer); |
| 71 | } |
| 72 | buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)std::malloc(bufferLength); |
| 73 | if (buffer == NULL) { |
| 74 | return false; |
| 75 | } |
| 76 | if (glpi(buffer, &bufferLength) == TRUE) { |
| 77 | if (bufferLength / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) * sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) != bufferLength) { |
| 78 | // sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) must have changed (different from at compile time) |
| 79 | std::free(buffer); |
| 80 | return false; |
| 81 | } |
| 82 | |
| 83 | auto end = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)((char*)buffer + bufferLength); |
no test coverage detected