1 /** @file 2 InterlockedDecrement function 3 4 Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR> 5 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 Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics. 17 **/ 18 19 long _InterlockedDecrement( 20 long * lpAddend 21 ); 22 23 #pragma intrinsic(_InterlockedDecrement) 24 25 /** 26 Performs an atomic decrement of an 32-bit unsigned integer. 27 28 Performs an atomic decrement of the 32-bit unsigned integer specified by 29 Value and returns the decrement value. The decrement operation must be 30 performed using MP safe mechanisms. The state of the return value is not 31 guaranteed to be MP safe. 32 33 @param Value A pointer to the 32-bit value to decrement. 34 35 @return The decrement value. 36 37 **/ 38 UINT32 39 EFIAPI 40 InternalSyncDecrement ( 41 IN volatile UINT32 *Value 42 ) 43 { 44 return _InterlockedDecrement ((long *)(UINTN)(Value)); 45 } 46 47
