MSDN Library


Windows Mobile 6.5
A version of this page is also available for

This function sets the priority value for the specified thread.

BOOL SetThreadPriority(
  HANDLE hThread,
  int nPriority


[in] Handle to the thread whose priority value is to be set.


[in] Specifies the priority value for the thread.

The following table shows possible values.

Value Description


Indicates 3 points above normal priority.


Indicates 2 points above normal priority.


Indicates 1 point above normal priority.


Indicates normal priority.


Indicates 1 point below normal priority.


Indicates 2 points below normal priority.


Indicates 3 points below normal priority.


Indicates 4 points below normal priority.

The priority levels zero through 7 that were available in earlier versions of Windows Embedded CE are now mapped to priority levels 248 through 255. These symbolic priority names should only be used with SetThreadPriority, and not with CeSetThreadPriority.

Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.

Windows Embedded CE does not support priority classes. The order in which threads are scheduled is determined only by their thread priorities.

This function enables setting the base priority level of a thread without considering priority classes.

Threads are scheduled in a round-robin fashion at each priority level. Threads at a lower level are only scheduled when no executable threads exist at a higher level.

All threads initially start at THREAD_PRIORITY_NORMAL (251).

Use the GetThreadPriority function to get the priority value of a thread.

Use thread priority values to differentiate the relative priorities of the tasks of a process. For example, a thread that handles input for a window could have a higher priority level than a thread that performs intensive calculations for the CPU.

When manipulating priorities, be sure a high-priority thread does not consume all available CPU time.

For more information about priority levels in Windows Embedded CE, see Priority Levels.

Windows Embedded CEWindows CE 1.0 and later
Windows MobileWindows Mobile Version 5.0 and later

Community Additions

© 2016 Microsoft