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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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SetPriorityClass
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 the process
| DWORD dwPriorityClass
| // priority class value
| );
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Parameters
hProcess
Identifies the process.
Windows NT: The handle must have the PROCESS_SET_INFORMATION access right. For more
information, see Process Objects.
dwPriorityClass
Specifies the priority class for the process. Specify one of the following
values:
Priority
| Meaning
| 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 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 application can use nearly all available CPU time.
| 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.
| NORMAL_PRIORITY_CLASS
| Specify this class for a process with no special scheduling needs.
| 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.
|
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.
See Also
CreateProcess, CreateThread, GetPriorityClass, GetThreadPriority, SetThreadPriority
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