reactos/ntoskrnl/io/cancel.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 1998, 1999, 2000, 2001 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id: cancel.c,v 1.6 2001/04/09 02:45:03 dwelch Exp $
  20  *
  21  * PROJECT:         ReactOS kernel
  22  * FILE:            ntoskrnl/io/cancel.c
  23  * PURPOSE:         Cancel routine
  24  * PROGRAMMER:      David Welch (welch@mcmail.com)
  25  * UPDATE HISTORY:
  26  *                  Created 22/05/98
  27  */
  28
  29 /* INCLUDES *****************************************************************/
  30
  31 #include <ddk/ntddk.h>
  32
  33 #define NDEBUG
  34 #include <internal/debug.h>
  35
  36 /* GLOBALS *******************************************************************/
  37
  38 static KSPIN_LOCK CancelSpinLock;
  39
  40 /* FUNCTIONS *****************************************************************/
  41
  42 NTSTATUS STDCALL
  43 NtCancelIoFile (IN      HANDLE                  FileHandle,
  44                 OUT     PIO_STATUS_BLOCK        IoStatusBlock)
  45 {
  46   UNIMPLEMENTED;
  47 }
  48
  49 BOOLEAN STDCALL
  50 IoCancelIrp(PIRP Irp)
  51 {
  52    KIRQL oldlvl;
  53
  54    DPRINT("IoCancelIrp(Irp %x)\n",Irp);
  55
  56    IoAcquireCancelSpinLock(&oldlvl);
  57    Irp->Cancel = TRUE;
  58    if (Irp->CancelRoutine == NULL)
  59      {
  60         return(FALSE);
  61      }
  62    Irp->CancelRoutine(Irp->Stack[0].DeviceObject, Irp);
  63    IoReleaseCancelSpinLock(oldlvl);
  64    return(TRUE);
  65 }
  66
  67 VOID
  68 IoInitCancelHandling(VOID)
  69 {
  70    KeInitializeSpinLock(&CancelSpinLock);
  71 }
  72
  73 VOID STDCALL
  74 IoAcquireCancelSpinLock(PKIRQL Irql)
  75 {
  76    KeAcquireSpinLock(&CancelSpinLock,Irql);
  77 }
  78
  79 VOID STDCALL
  80 IoReleaseCancelSpinLock(KIRQL Irql)
  81 {
  82    KeReleaseSpinLock(&CancelSpinLock,Irql);
  83 }
  84
  85 /* EOF */