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| 1 | This readme refers to the file thr-mach.c.
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| 2 |
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| 3 | Under mach, thread priorities are kinda strange-- any given thread has
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| 4 | a MAXIMUM priority and a BASE priority. The BASE priority is the
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| 5 | current priority of the thread and the MAXIMUM is the maximum possible
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| 6 | priority the thread can assume. The developer can lower, but never
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| 7 | raise the maximum priority.
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| 8 |
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| 9 | The gcc concept of thread priorities is that they run at one of three
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| 10 | levels; interactive, background, and low.
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| 11 |
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| 12 | Under mach, this is translated to:
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| 13 |
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| 14 | interactive -- set priority to maximum
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| 15 | background -- set priority to 2/3 of maximum
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| 16 | low -- set priority to 1/3 of maximum
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| 17 |
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| 18 | This means that it is possible for a thread with the priority of
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| 19 | interactive to actually run at a lower priority than another thread
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| 20 | with a background, or even low, priority if the developer has modified
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| 21 | the maximum priority.
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| 22 |
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| 23 |
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