MdePkg/Library/BaseSynchronizationLib/InterlockedDecrementMsc.c

   1 /** @file
   2   InterlockedDecrement function
   3
   4   Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 /**
  10   Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
  11 **/
  12
  13 long
  14 _InterlockedDecrement (
  15   long  *lpAddend
  16   );
  17
  18 #pragma intrinsic(_InterlockedDecrement)
  19
  20 /**
  21   Performs an atomic decrement of an 32-bit unsigned integer.
  22
  23   Performs an atomic decrement of the 32-bit unsigned integer specified by
  24   Value and returns the decrement value. The decrement operation must be
  25   performed using MP safe mechanisms. The state of the return value is not
  26   guaranteed to be MP safe.
  27
  28   @param  Value A pointer to the 32-bit value to decrement.
  29
  30   @return The decrement value.
  31
  32 **/
  33 UINT32
  34 EFIAPI
  35 InternalSyncDecrement (
  36   IN      volatile UINT32  *Value
  37   )
  38 {
  39   return _InterlockedDecrement ((long *)(Value));
  40 }