Timer and Time-of-Day Kernel Services

The Timer and Time-of-Day kernel services provide kernel extensions with the ability to be notified when a period of time has passed.

The tstart service supports a very fine granularity of time. The timeout service is built on the tstart service and is provided for compatibility with earlier versions of the operating system. The w_start service provides a timer with less granularity, but much cheaper path-length overhead when starting a timer.

The Timer and Time-of-Day kernel services are divided into the following categories: