diff options
| author | mdkinney <mdkinney@6f19259b-4bc3-4df7-8a09-765794883524> | 2009-01-30 00:45:13 +0000 |
|---|---|---|
| committer | mdkinney <mdkinney@6f19259b-4bc3-4df7-8a09-765794883524> | 2009-01-30 00:45:13 +0000 |
| commit | 720d3c5fb31b6b2df535f7a281d5d9d297c5eede (patch) | |
| tree | 7f9e1cd0d0a83ae3d5583b186b152ab469f48376 /MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.c | |
| parent | 914826ba1dc3f03b2a3a88842ba7e41923231258 (diff) | |
| download | edk2-platforms-720d3c5fb31b6b2df535f7a281d5d9d297c5eede.tar.xz | |
Split out Synchronization Library from Base Library
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7377 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.c')
| -rw-r--r-- | MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.c b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.c new file mode 100644 index 0000000000..d1f0868a83 --- /dev/null +++ b/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.c @@ -0,0 +1,42 @@ +/** @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]
+ }
+}
|