By Penny Orwick
Grasp the good points and features of the recent home windows driving force Foundation--with information directly from the specialists. the recent home windows driving force beginning, in response to the home windows motive force equipment, simplifies motive force improvement with new types and instruments wide-spread to builders who paintings with Microsoft visible Studio®. This in-depth consultant gives you authoritative tips on those new types, directly from the groups at Microsoft who constructed the home windows motive force beginning and in line with suggestions from beta testers. you will get boost insights, useful suggestion, and most sensible practices for utilizing the home windows driving force Foundation--helping you succeed in new degrees of talent. contains code samples in Microsoft visible C++.
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Extra info for Developing Drivers with the Microsoft Windows Driver Foundation
Neither I/O simply passes the buffer's user-mode address to the driver. The driver has no assurance that the pointer is even valid by the time it attempts to access the buffer. A driver can safely access the user-mode buffer, but only if the driver takes steps to ensure that the buffer pointer is valid. Chapter 8, "I/O Flow and Dispatching," provides a discussion of how to perform I/O by using each of these transfer mechanisms. How to Transfer Data to or from a Device Many I/O requests require the driver to transfer data to or from a device.
However, potential race conditions can be managed to prevent such problems. The following are the two basic approaches: • Synchronization Uses synchronization objects to protect access to shared data. • Serialization Prevents race conditions from occurring by queuing the requests that must access the shared data to guarantee that they are always handled in sequence, never at the same time. Tip Timing issues can be much more critical with drivers than with applications, especially on multiprocessor systems.
User mode A restricted operating mode in which applications and UMDF drivers run that does not permit direct access to core Windows routines or data structures. • work item A mechanism used by high-IRQL routines to have some of their processing performed at PASSIVE_LEVEL. Chapter 3: WDF Fundamentals Overview The WDF driver model defines an object-oriented, event-driven environment for both kernel-mode (KMDF) and user-mode (UMDF) drivers. Driver code manages device-specific features, and a Microsoft-supplied framework calls the WDF driver to respond to events that affect the operation of its device.