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 1.11 2003/07/11 01:23:14 royce 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   return(STATUS_NOT_IMPLEMENTED);
  48 }
  49
  50 /*
  51  * @implemented
  52  */
  53 BOOLEAN STDCALL
  54 IoCancelIrp(PIRP Irp)
  55 {
  56    KIRQL oldlvl;
  57
  58    DPRINT("IoCancelIrp(Irp %x)\n",Irp);
  59
  60    IoAcquireCancelSpinLock(&oldlvl);
  61    Irp->Cancel = TRUE;
  62    if (Irp->CancelRoutine == NULL)
  63    {
  64       IoReleaseCancelSpinLock(oldlvl);
  65       return(FALSE);
  66    }
  67    Irp->CancelIrql = oldlvl;
  68    Irp->CancelRoutine(IoGetCurrentIrpStackLocation(Irp)->DeviceObject, Irp);
  69    return(TRUE);
  70 }
  71
  72 VOID
  73 IoInitCancelHandling(VOID)
  74 {
  75    KeInitializeSpinLock(&CancelSpinLock);
  76 }
  77
  78 /*
  79  * @implemented
  80  */
  81 VOID STDCALL
  82 IoAcquireCancelSpinLock(PKIRQL Irql)
  83 {
  84    KeAcquireSpinLock(&CancelSpinLock,Irql);
  85 }
  86
  87 /*
  88  * @implemented
  89  */
  90 VOID STDCALL
  91 IoReleaseCancelSpinLock(KIRQL Irql)
  92 {
  93    KeReleaseSpinLock(&CancelSpinLock,Irql);
  94 }
  95
  96 /* EOF */