Add option to use logical cores for default threads

programs/util.h

@@ -289,13 +289,19 @@ void UTIL_refFilename(FileNamesTable* fnt, const char* filename);
 FileNamesTable*
 UTIL_createExpandedFNT(const char* const* filenames, size_t nbFilenames, int followLinks);
 
+#if defined(_WIN32) || defined(WIN32)
+DWORD CountSetBits(ULONG_PTR bitMask);
+#endif
 
 /*-****************************************
  *  System
  ******************************************/
 
+int UTIL_countCores(int logical);
+
 int UTIL_countPhysicalCores(void);
 
+int UTIL_countLogicalCores(void);
 
 #if defined (__cplusplus)
 }