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14 gru 2021 · Starting an I/O Queue. When a driver calls WdfIoQueueCreate to create an I/O queue, the framework automatically enables the queue to receive I/O requests and to deliver them to a driver. Drivers typically call WdfIoQueueCreate from within an EvtDriverDeviceAdd callback function.
2 lut 2023 · Most drivers create I/O queues in their EvtDriverDeviceAdd callback function. To create an I/O queue for a device, the driver calls the framework queue object's WdfIoQueueCreate method (which creates a framework queue object).
For each device that is connected to a system and supported by a particular driver, the driver can use the following combinations of I/O queues and request handlers: A single, default I/O queue and a single request handler, EvtIoDefault.
It covers the components that make up the I/O system, including the I/O manager, Plug and Play (PnP) manager, and power manager, and also examines the structure and components of the I/O system and the various types of device drivers.
In Windows 10 simply reducing the process priority in Task Manager doesn't change its disk IO priority. You need to use some tools like https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer
16 kwi 2015 · Use ReadFileEx and WriteFileEx to queue Asynchronous Procedure Calls (APCs) to the calling thread and SleepEx (or WaitFor{Single|Multiple}ObjectsEx) with Alertable TRUE to receive a notification message for each operation when it completes. This method is similar to an IO completion port, but only works for one thread.
14 gru 2021 · When a driver creates an I/O queue, it can specify whether the queue is power-managed. When I/O requests are available in a power-managed queue, the framework delivers the requests to the driver only if the device is in its working (D0) state.
