Making a VC++ app have process "priority" on WIN2K programatically

[mgparrish]

Does anyone know how to make an app force itself to become a high (or real time) priority process on W2K?

I know how to use Win TaskManager to set the program process priority AFTER my app is executed, but is there any way to do this with my VC++ code without the use of an outside utility?

thx

 

[branyesz]

Yes it is, this is what MSDN writes about it:

The SetPriorityClass function sets the priority class for the specified process. This value together with the priority value of each thread of the process determines each thread's base priority level.

BOOL SetPriorityClass(
HANDLE hProcess, // handle to process
DWORD dwPriorityClass // priority class
);
Parameters
[ul][li]hProcess[/li]
[in] Handle to the process.
Windows NT/2000/XP: The handle must have the PROCESS_SET_INFORMATION access right. For more information, see Process Security and Access Rights.

[li]dwPriorityClass[/li]
[in] Specifies the priority class for the process. This parameter can be one of the following values.
[/ul]
[ul][li]ABOVE_NORMAL_PRIORITY_CLASS
Windows 2000/XP: Indicates a process that has priority above NORMAL_PRIORITY_CLASS but below HIGH_PRIORITY_CLASS.[/li]
[li]BELOW_NORMAL_PRIORITY_CLASS
Windows 2000/XP: Indicates a process that has priority above IDLE_PRIORITY_CLASS but below NORMAL_PRIORITY_CLASS.[/li]
[li]HIGH_PRIORITY_CLASS
Specify this class for a process that performs time-critical tasks that must be executed immediately. The threads of the process preempt the threads of normal or idle priority class processes. An example is the 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 application can use nearly all available CPU time.[/li]
[li]IDLE_PRIORITY_CLASS
Specify this class for a process whose threads run only when the system is idle. The threads of the process 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.[/li]
[li]NORMAL_PRIORITY_CLASS
Specify this class for a process with no special scheduling needs.[/li]
[li]REALTIME_PRIORITY_CLASS
Specify this class for a process that has the highest possible priority. The threads of the 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.[/li][/ul]

Return Values
If the function succeeds, the return value is nonzero.

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

Remarks
Every thread has a base priority level determined by the thread's priority value and the priority class of its process. The system uses the base priority level of all executable threads to determine which thread gets the next slice of CPU time. The SetThreadPriority function enables setting the base priority level of a thread relative to the priority class of its process. For more information, see Scheduling Priorities.

Requirements
Windows NT/2000/XP: Included in Windows NT 3.1 and later.
Windows 95/98/Me: Included in Windows 95 and later.
Header: Declared in Winbase.h; include Windows.h.
Library: Use Kernel32.lib.

 

[mgparrish]

Awesome!!!

Thx a bundle Branyesz!!!!