MdePkg/Library/BaseLib/Ia32/InterlockedIncrement.c

   1 /** @file
   2   InterLockedIncrement function
   3
   4   Copyright (c) 2006 - 2007, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 //
  16 // Include common header file for this module.
  17 //
  18
  19
  20 /**
  21   Performs an atomic increment of an 32-bit unsigned integer.
  22
  23   Performs an atomic increment of the 32-bit unsigned integer specified by
  24   Value and returns the incremented value. The increment 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 increment.
  29
  30   @return The incremented value.
  31
  32 **/
  33 UINT32
  34 EFIAPI
  35 InternalSyncIncrement (
  36   IN      UINT32                    *Value
  37   )
  38 {
  39   _asm {
  40     mov     eax, Value
  41     lock    inc     dword ptr [eax]
  42     mov     eax, [eax]
  43   }
  44 }
  45