please dont rip this site Prev Next

GetPriorityClass info  Overview  Group

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

DWORD GetPriorityClass(

    HANDLE hProcess 

// handle to the process

   );

Parameters

hProcess
Identifies the process.

Windows NT: The handle must have PROCESS_QUERY_INFORMATION access. For more information, see Process Objects.

Return Values

If the function succeeds, the return value is the priority class of the specified process.

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

The processís priority class is one of the following values:

Priority

Meaning

HIGH_PRIORITY_CLASS

Indicates a process that performs time-critical tasks that must be executed immediately for it to run correctly. The threads of a high-priority class process preempt the threads of normal or idle priority class processes. An example is Windows Task List, which must respond quickly when called by the user, regardless of the load on the operating system. Use extreme care when using the high-priority class, because a high-priority class CPU-bound application can use nearly all available cycles.

IDLE_PRIORITY_CLASS

Indicates a process whose threads run only when the system is idle and are preempted by the threads of any process running in a higher priority class. An example is a screen saver. The idle priority class is inherited by child processes.

NORMAL_PRIORITY_CLASS

Indicates a normal process with no special scheduling needs.

REALTIME_PRIORITY_CLASS

Indicates a process that has the highest possible priority. The threads of a real-time priority class process preempt the threads of all other processes, including operating system processes performing important tasks. For example, a real-time process that executes for more than a very brief interval can cause disk caches not to flush or cause the mouse to be unresponsive.

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, see the SetPriorityClass function.

See Also

GetThreadPriority, SetPriorityClass, SetThreadPriority 

See also:


file: /Techref/os/win/api/win32/func/src/f36_16.htm, 4KB, , updated: 2000/4/7 12:19, local time: 2022/5/21 14:47,
TOP NEW HELP FIND: 
3.239.129.91:LOG IN

 ©2022 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF="http://www.piclist.com/techref/os/win/api/win32/func/src/f36_16.htm"> GetPriorityClass</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2022 contributors:
o List host: MIT, Site host massmind.org, Top posters @20220521
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
 

Welcome to www.piclist.com!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .