reactos/lib/intrlck/decrement.c

   1 /*
   2  * PROJECT:     ReactOS system libraries
   3  * LICENSE:     GPL - See COPYING in the top level directory
   4  * FILE:        lib/intrlck/decrement.c
   5  * PURPOSE:     Inter lock decrements
   6  * PROGRAMMERS: Copyright 1995 Martin von Loewis
   7  *              Copyright 1997 Onno Hovers
   8  */
   9
  10 #include <windows.h>
  11
  12 /************************************************************************
  13 *           InterlockedDecrement                                        *
  14 *                                                                       *
  15 * InterlockedDecrement adds -1 to a long variable and returns           *
  16 * the resulting decremented value.                                      *
  17 *                                                                       *
  18 ************************************************************************/
  19
  20 LONG NTAPI
  21 InterlockedDecrement(
  22         LPLONG lpAddend)
  23 {
  24         return InterlockedExchangeAdd( lpAddend, -1 ) - 1;
  25 }