Chapter 20. Timers
Timers are used in almost all types of software but are especially useful for writing systems or network software. Most timers are implemented with the assistance of an underlying hardware timer, accessed through your operating system interface, which indicates timer expiration in an OS-dependent fashion. Once the hardware timer expires, it notifies the operating system, which in turn will notify the calling application. Achieving all this varies greatly, depending on the machine/OS.
In this chapter, we introduce timers and how they are built with timer queues. We then discuss the timer queue facilities provided by ACE and incorporate them into a crude timer dispatcher. Next, we show you some of the prebuilt timer dispatchers ...
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