Книга: Real-Time Concepts for Embedded Systems

11.8 Points to Remember

11.8 Points to Remember

Some points to remember include the following:

· Hardware timers (hard timers) are handled within the context of the ISR. The timer handler must conform to general restrictions placed on the ISR.

· The kernel scheduler depends on the announcement of time passing per tick.

· Soft timers are built on hard timers and are less accurate because of various delays.

· A soft-timer handling facility should allow for efficient timer installation, cancellation, and timer bookkeeping.

· A soft-timer facility built using the timing-wheel approach provides efficient operations for installation, cancellation, and timer bookkeeping.

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