Initial import.

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ipf / Synchronization.c

/** @file\r
  Implementation of synchronization functions on Itanium.\r
\r
  Copyright (c) 2006, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
  Module Name:  Synchronization.c\r
\r
**/\r
\r
UINT32\r
EFIAPI\r
InternalSyncCompareExchange32 (\r
  IN      volatile UINT32           *Value,\r
  IN      UINT32                    CompareValue,\r
  IN      UINT32                    ExchangeValue\r
  );\r
\r
UINT32\r
EFIAPI\r
InternalSyncIncrement (\r
  IN      volatile UINT32           *Value\r
  )\r
{\r
  UINT32                            OriginalValue;\r
\r
  do {\r
    OriginalValue = *Value;\r
  } while (OriginalValue == InternalSyncCompareExchange32 (\r
                              Value,\r
                              OriginalValue,\r
                              OriginalValue + 1\r
                              ));\r
  return OriginalValue + 1;\r
}\r
\r
UINT32\r
EFIAPI\r
InternalSyncDecrement (\r
  IN      volatile UINT32           *Value\r
  )\r
{\r
  UINT32                            OriginalValue;\r
\r
  do {\r
    OriginalValue = *Value;\r
  } while (OriginalValue == InternalSyncCompareExchange32 (\r
                              Value,\r
                              OriginalValue,\r
                              OriginalValue - 1\r
                              ));\r
  return OriginalValue - 1;\r
}\r