reactos/hal/halx86/generic/fmutex.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/hal/x86/fmutex.c
   6  * PURPOSE:         Implements fast mutexes
   7  * PROGRAMMER:      David Welch (welch@cwcom.net)
   8  *                  Eric Kohl (ekohl@rz-online.de)
   9  * UPDATE HISTORY:
  10  *                  Created 09/06/2000
  11  */
  12
  13 /* INCLUDES *****************************************************************/
  14
  15 #define NDEBUG
  16 #include <hal.h>
  17
  18 /* FUNCTIONS *****************************************************************/
  19
  20 #undef KeEnterCriticalRegion
  21 #undef KeLeaveCriticalRegion
  22 VOID FASTCALL
  23 ExAcquireFastMutex (PFAST_MUTEX FastMutex)
  24 {
  25    KeEnterCriticalRegion();
  26    ExAcquireFastMutexUnsafe(FastMutex);
  27 }
  28
  29
  30 VOID FASTCALL
  31 ExReleaseFastMutex (PFAST_MUTEX FastMutex)
  32 {
  33   ExReleaseFastMutexUnsafe(FastMutex);
  34   KeLeaveCriticalRegion();
  35 }
  36
  37
  38 BOOLEAN FASTCALL
  39 ExTryToAcquireFastMutex (PFAST_MUTEX FastMutex)
  40 {
  41   KeEnterCriticalRegion();
  42   if (InterlockedExchange(&FastMutex->Count, 0) == 1)
  43     {
  44       FastMutex->Owner = KeGetCurrentThread();
  45       return(TRUE);
  46     }
  47   else
  48     {
  49       KeLeaveCriticalRegion();
  50       return(FALSE);
  51     }
  52 }
  53
  54 /* EOF */