I/O Queues
An I/O queue object represents a queue that presents I/O requests to the driver and provides a way to control the flow of I/O requests to a driver. A WDF I/O queue is more than just a list of pending requests, however. Queue objects track requests that are active in the driver, support request cancellation, manage the concurrency of requests, can optionally synchronize their operations with the Plug and Play and power state of the device, and can optionally synchronize calls to the driver’s I/O event callback functions.
The driver creates its I/O queues after it creates the device object. To create a queue, a driver calls one of the following methods:
A UMDF driver calls IWDFDevice::CreateIoQueue.
A KMDF driver calls WdfIoQueueCreate
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