IoRequestDpc function (wdm.h)

The IoRequestDpc routine queues a driver-supplied DpcForIsr routine to complete interrupt-driven I/O processing at a lower IRQL.

Syntax

void IoRequestDpc(
  [in] PDEVICE_OBJECT         DeviceObject,
  [in] PIRP                   Irp,
  [in] __drv_aliasesMem PVOID Context
);

Parameters

[in] DeviceObject

Pointer to the device object for which the request that caused the interrupt is being processed.

[in] Irp

Pointer to the current IRP for the specified device.

[in] Context

Pointer to a driver-determined context to be passed to the DPC routine.

Return value

None

Remarks

Callers of IoRequestDpc must be running at DIRQL.

Drivers call IoRequestDpc from an InterruptService routine. Because of this, IoRequestDpc runs at the DIRQL value that was specified by SynchronizeIrql when the driver called IoConnectInterrupt. However, it is also possible to queue a DPC at any IRQL >= DISPATCH_LEVEL by using the KeXxxDpc routines. For more information, see Which Type of DPC Should You Use?

Requirements

See also

IoInitializeDpcRequest

KeInitializeDpc

KeInsertQueueDpc