This method is thread safe, however it may take some time to run (performance counter performance is highly variable) so care should be taken not to call this in a performance critical code section.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2