/*++ Copyright (c) 1989 Microsoft Corporation Module Name: beep.h Abstract: These are the structures and defines that are used in the beep driver. Author: Lee A. Smith (lees) 02-Aug-1991. Revision History: --*/ #ifndef _BEEP_ #define _BEEP_ #include // // Define the device extension. // typedef struct _DEVICE_EXTENSION { KTIMER Timer; FAST_MUTEX Mutex; ULONG ReferenceCount; BOOLEAN TimerSet; } DEVICE_EXTENSION, *PDEVICE_EXTENSION; #endif // _BEEP_