WORK_QUEUE_TYPE enumeration (wdm.h)
The WORK_QUEUE_TYPE enumeration type indicates the type of system worker thread that handles a work item.
Syntax
typedef enum _WORK_QUEUE_TYPE {
CriticalWorkQueue,
DelayedWorkQueue,
HyperCriticalWorkQueue,
NormalWorkQueue,
BackgroundWorkQueue,
RealTimeWorkQueue,
SuperCriticalWorkQueue,
MaximumWorkQueue,
CustomPriorityWorkQueue
} WORK_QUEUE_TYPE;
Constants
CriticalWorkQueue Indicates a real-time system worker thread. The assigned priority level is 13. |
DelayedWorkQueue Indicates an ordinary worker thread. The assigned priority level is 12. |
HyperCriticalWorkQueue System priority level. The assigned priority level is 15. |
NormalWorkQueue System priority level. The assigned priority level is 8 |
BackgroundWorkQueue System priority level. The assigned priority level is 7. |
RealTimeWorkQueue System priority level. The assigned priority level is18. |
SuperCriticalWorkQueue System priority level. The assigned priority level is 14. |
MaximumWorkQueue System priority maximum. No priority level assigned. |
CustomPriorityWorkQueue The queue has a custom priority level assigned by the caller. The CustomPriorityWorkQueue value is the base priority level for the custom priority queue. Work items are queued at a particular priority by setting QueueType to CustomPriorityWorkQueue + Priority where Priority is the KPRIORITY value for the work item. This queue type is valid starting with Windows 8.1. |
Remarks
For drivers targeting Windows 8.1 or later versions of Windows, use of only CustomPriorityWorkQueue with a custom priority level is recommended.
A work queue priority < 17 is advised since queuing
at a higher priority may interfere with work item processing by critical system components.
For more information about system worker threads, see System Worker Threads.
Requirements
Requirement | Value |
---|---|
Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |