ABSTRACT
Note that the no tion of real-time pro gram ming does not co in cide with the pro - gram ming of real-time clocks. Real-time com put ing (also called re ac tive com put ing) re fers to sys tems that are sub ject to a time con straint. For ex am ple, a pro gram that must en sure that a dead line is met be tween a world event and a sys tem re sponse. Non-real-time sys tems can not guar an tee a re sponse even if it is the usual re sult. In this sense, the topic of this chap ter is lim ited to clock ing de vices and rou tines that mea sure time in con ven tional units, not to real-time com put ing.
