Timer Task Force

Timer Task Force

This page is used to collect requirements and suggestions concerning a hwtimer/vtimer/RTC redesign.

requirements

• very efficient timers for use in time-critical drivers
• easy-to-use interface

API

• Wait for a time period
• Await a point in time
• Wait for a (past) time + x
• (use RTC if available for super-long-time timers)

design questions

• what granularity to use? msec,usec,nsec, timer ticks, a combination?

current state:

• timer.h: timer hardware abstraction, using ticks

• hwtimer: low-level timer multiplexing, one timer.h timer using the same ticks

• vtimer: higher-level timer multiplexing, using one hwtimer, usecs

• first two look OK, are stable

• vtimer sucks