FltCbdqEnable function (fltkernel.h)
FltCbdqEnable enables a callback data queue that was disabled by a previous call to FltCbdqDisable.
Syntax
VOID FLTAPI FltCbdqEnable(
[in, out] PFLT_CALLBACK_DATA_QUEUE Cbdq
);
Parameters
[in, out] Cbdq
Pointer to the callback data queue.
Return value
None
Remarks
FltCbdqEnable reenables a callback data queue that was disabled by a previous call to FltCbdqDisable. After the callback data queue is reenabled, it can once again accept new items.
Minifilter drivers can use the FltCbdqXxx routines to implement a callback data queue for IRP-based I/O operations. By using these routines, minifilter drivers can make their queue cancel-safe; the system transparently handles I/O cancellation for the minifilter driver.
The FltCbdqXxx routines can only be used for IRP-based I/O operations. To determine whether a given callback data structure represents an IRP-based I/O operation, use the FLT_IS_IRP_OPERATION macro.
If the queue is protected by a spin lock rather than a mutex object or resource variable, the caller of FltCbdqEnable can be running at IRQL <= DISPATCH_LEVEL. If a mutex or resource is used, the caller must be running at IRQL <= APC_LEVEL.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Universal |
| Header | fltkernel.h (include Fltkernel.h) |
| IRQL | See Remarks section |