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GetThreadPriority info  Overview  Group

The GetThreadPriority function returns the priority value for the specified thread. This value, together with the priority class of the threadís process, determines the threadís base-priority level.

int GetThreadPriority(

    HANDLE hThread 

// handle to thread

   );

Parameters

hThread
Identifies the thread.

Windows NT: The handle must have THREAD_QUERY_INFORMATION access. For more information, see Thread Objects.

Return Values

If the function succeeds, the return value is the threadís priority level.

If the function fails, the return value is THREAD_PRIORITY_ERROR_RETURN. To get extended error information, call GetLastError.

The threadís priority level is one of the following values:

Priority

Meaning

THREAD_PRIORITY_ABOVE_NORMAL

Indicates 1 point above normal priority for the priority class.

THREAD_PRIORITY_BELOW_NORMAL

Indicates 1 point below normal priority for the priority class.

THREAD_PRIORITY_HIGHEST

Indicates 2 points above normal priority for the priority class.

THREAD_PRIORITY_IDLE

Indicates a base-priority level of 1 for IDLE_PRIORITY_CLASS, NORMAL_PRIORITY_CLASS, or HIGH_PRIORITY_CLASS processes, and a base-priority level of 16 for REALTIME_PRIORITY_CLASS processes.

THREAD_PRIORITY_LOWEST

Indicates 2 points below normal priority for the priority class.

THREAD_PRIORITY_NORMAL

Indicates normal priority for the priority class.

THREAD_PRIORITY_TIME_CRITICAL

Indicates a base-priority level of 15 for IDLE_PRIORITY_CLASS, NORMAL_PRIORITY_CLASS, or HIGH_PRIORITY_CLASS processes, and a base-priority level of 31 for REALTIME_PRIORITY_CLASS processes.

Remarks

Every thread has a base-priority level determined by the threadís priority value and the priority class of its process. The operating system uses the base-priority level of all executable threads to determine which thread gets the next slice of CPU time. Threads are scheduled in a round-robin fashion at each priority level, and only when there are no executable threads at a higher level will scheduling of threads at a lower level take place.

For a table that shows the base-priority levels for each combination of priority class and thread priority value, refer to the SetPriorityClass function.

See Also

GetPriorityClass, SetPriorityClass, SetThreadPriority 

See also:


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