Difference between revisions of "Clocks and Time"
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* Absolute Time - A specific time. e.g. 10AM. | * Absolute Time - A specific time. e.g. 10AM. | ||
* Relative Time - A value expressed as relative to some other time value (usually the current value). e.g. 10000 milliseconds. | * Relative Time - A value expressed as relative to some other time value (usually the current value). e.g. 10000 milliseconds. | ||
| + | * Standard Java only has a wall clock - calendar time. But real time systems require: | ||
| + | ** A monotonic clock. | ||
| + | ** A countdown clock. | ||
| + | ** A CPU execution time clock. | ||
[[Category:RealtimeJava]] | [[Category:RealtimeJava]] | ||
Revision as of 09:27, 11 December 2011
Intro
- Absolute Time - A specific time. e.g. 10AM.
- Relative Time - A value expressed as relative to some other time value (usually the current value). e.g. 10000 milliseconds.
- Standard Java only has a wall clock - calendar time. But real time systems require:
- A monotonic clock.
- A countdown clock.
- A CPU execution time clock.
