WDF_CALLBACK_CONSTRAINT - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// wudfddi_types.h

typedef enum _WDF_CALLBACK_CONSTRAINT {
  None,
  WdfDeviceLevel,
  WdfLevelReserved,
  WdfLevelMaximum
} WDF_CALLBACK_CONSTRAINT;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ne-wudfddi_types-_wdf_callback_constraint)

_WDF_CALLBACK_CONSTRAINT enumeration

Description

Constants

None

No callback functions into the driver are synchronized. The driver must handle all synchronization.

WdfDeviceLevel

All callback functions into the driver that are associated with the device are synchronized, including all callback functions that are associated with I/O queues. Only one event handler that is associated with the device can run at any given time.

WdfLevelReserved

Reserved.

WdfLevelMaximum

Remarks

Note that the above locking models apply only for I/O (that is, open, read, write, and device I/O control) operations and not for Plug and Play (PnP) and power management notifications.

View the official Windows Driver Kit DDI reference

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