MdePkg/Library/BaseLib/Ia32/CpuPause.c

   1 /** @file
   2   CpuPause function.
   3
   4   Copyright (c) 2006 - 2008, 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
  17
  18 /**
  19   Requests CPU to pause for a short period of time.
  20
  21   Requests CPU to pause for a short period of time. Typically used in MP
  22   systems to prevent memory starvation while waiting for a spin lock.
  23
  24 **/
  25 VOID
  26 EFIAPI
  27 CpuPause (
  28   VOID
  29   )
  30 {
  31   _asm {
  32     pause
  33   }
  34 }
  35