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WORK_QUEUE_TYPE enumeration

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  = 32
} 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

Header

Wdm.h (include Wdm.h, Ntddk.h, or Ntifs.h)

See also

IoQueueWorkItem
IoQueueWorkItemEx
IoTryQueueWorkItem

 

 

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