ABSTRACT
Hardware I/O IRP Queuing This chapter starts looking at the WdmIo and PHDIo drivers. Although the text only refers to the WdmIo driver, the techniques used in PHDIo are identical.
Any driver that talks to a real device will need to control access to the hardware. Chapter 9 mentioned that Critical section routines should be used to run routines that cannot be interrupted. Critical section routines are now used for real.
