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 #include <hal.h>
  16 #define NDEBUG
  17 #include <debug.h>
  18
  19 /* FUNCTIONS *****************************************************************/
  20
  21 #undef KeEnterCriticalRegion
  22 #undef KeLeaveCriticalRegion
  23 VOID FASTCALL
  24 ExAcquireFastMutex (PFAST_MUTEX FastMutex)
  25 {
  26    KeEnterCriticalRegion();
  27    ExAcquireFastMutexUnsafe(FastMutex);
  28 }
  29
  30
  31 VOID FASTCALL
  32 ExReleaseFastMutex (PFAST_MUTEX FastMutex)
  33 {
  34   ExReleaseFastMutexUnsafe(FastMutex);
  35   KeLeaveCriticalRegion();
  36 }
  37
  38
  39 BOOLEAN FASTCALL
  40 ExTryToAcquireFastMutex (PFAST_MUTEX FastMutex)
  41 {
  42   KeEnterCriticalRegion();
  43   if (InterlockedExchange(&FastMutex->Count, 0) == 1)
  44     {
  45       FastMutex->Owner = KeGetCurrentThread();
  46       return(TRUE);
  47     }
  48   else
  49     {
  50       KeLeaveCriticalRegion();
  51       return(FALSE);
  52     }
  53 }
  54
  55 /* EOF */