About Threads
The thread is the basic unit of execution in Windows. However, Windows does not create a thread in which to run a KMDF driver, and most KMDF drivers do not create threads. Instead, a driver is a group of functions that are called in an existing thread that is “borrowed” from an application or system component. The existing thread has a context that limits the data that the driver can access. It is important to understand the thread context in which certain driver callbacks run if you are creating drivers that perform some types of I/O operations.
Thread Scheduling
Windows schedules individual threads, not entire processes, for execution. Every thread has a scheduling priority—its thread priority—which is a value from 0 to 31, inclusive. ...
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