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62 lines
1.6 KiB
ReStructuredText
62 lines
1.6 KiB
ReStructuredText
PRThreadPriority
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================
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A thread's priority setting.
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Syntax
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------
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.. code::
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#include <prthread.h>
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typedef enum PRThreadPriority
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{
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PR_PRIORITY_FIRST = 0,
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PR_PRIORITY_LOW = 0,
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PR_PRIORITY_NORMAL = 1,
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PR_PRIORITY_HIGH = 2,
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PR_PRIORITY_URGENT = 3,
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PR_PRIORITY_LAST = 3
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} PRThreadPriority;
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Enumerators
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~~~~~~~~~~~
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``PR_PRIORITY_FIRST``
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Placeholder.
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``PR_PRIORITY_LOW``
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The lowest possible priority. This priority is appropriate for
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threads that are expected to perform intensive computation.
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``PR_PRIORITY_NORMAL``
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The most commonly expected priority.
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``PR_PRIORITY_HIGH``
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Slightly higher priority than ``PR_PRIORITY_NORMAL``. This priority
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is for threads performing work of high urgency but short duration.
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``PR_PRIORITY_URGENT``
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Highest priority. Only one thread at a time typically has this
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priority.
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``PR_PRIORITY_LAST``
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Placeholder
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Description
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-----------
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In general, an NSPR thread of higher priority has a statistically better
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chance of running relative to threads of lower priority. However,
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because of the multiple strategies NSPR uses to implement threading on
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various host platforms, NSPR priorities are not precisely defined. At
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best they are intended to specify a preference in the amount of CPU time
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that a higher-priority thread might expect relative to a lower-priority
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thread. This preference is still subject to resource availability and
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must not be used in place of proper synchronization.
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See Also
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--------
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`Setting Thread
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Priorities <Introduction_to_NSPR#Setting_Thread_Priorities>`__.
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