mirror of https://github.com/acidanthera/audk.git
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
|
/** @file
|
||
|
|
InterlockedDecrement function
|
||
|
|
|
||
|
|
Copyright (c) 2006 - 2008, Intel Corporation<BR>
|
||
|
|
All rights reserved. This program and the accompanying materials
|
||
|
|
are licensed and made available under the terms and conditions of the BSD License
|
||
|
|
which accompanies this distribution. The full text of the license may be found at
|
||
|
|
http://opensource.org/licenses/bsd-license.php
|
||
|
|
|
||
|
|
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
|
||
|
|
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
|
||
|
|
|
||
|
|
**/
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
Performs an atomic decrement of an 32-bit unsigned integer.
|
||
|
|
|
||
|
|
Performs an atomic decrement of the 32-bit unsigned integer specified by
|
||
|
|
Value and returns the decrement value. The decrement operation must be
|
||
|
|
performed using MP safe mechanisms. The state of the return value is not
|
||
|
|
guaranteed to be MP safe.
|
||
|
|
|
||
|
|
@param Value A pointer to the 32-bit value to decrement.
|
||
|
|
|
||
|
|
@return The decrement value.
|
||
|
|
|
||
|
|
**/
|
||
|
|
UINT32
|
||
|
|
EFIAPI
|
||
|
|
InternalSyncDecrement (
|
||
|
|
IN UINT32 *Value
|
||
|
|
)
|
||
|
|
{
|
||
|
|
_asm {
|
||
|
|
mov eax, Value
|
||
|
|
lock dec dword ptr [eax]
|
||
|
|
mov eax, [eax]
|
||
|
|
}
|
||
|
|
}
|