Scheduling

The operating system's scheduler decides when to run each ready thread according to its schedule, the algorithm that determines when a thread runs, how long it runs, and what threads can preempt it. A thread's schedule depends on its purpose. The scheduling requirements of an application thread, for example, are different from those of a thread that handles user input. The CommonPoint application system defines several schedule types:

• Application schedule, for threads that execute application code.
• User interface schedule, for threads that gather user input.
• Server schedule, for threads that execute important "background" code.
• Support schedule, for threads that execute less critical background code.

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