reactos/subsystems/win32/win32k/ntuser/ntuser.c

   1 /*
   2  *  ReactOS W32 Subsystem
   3  *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 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: painting.c 16320 2005-06-29 07:09:25Z navaraf $
  20  *
  21  *  COPYRIGHT:        See COPYING in the top level directory
  22  *  PROJECT:          ReactOS kernel
  23  *  PURPOSE:          ntuser init. and main funcs.
  24  *  FILE:             subsys/win32k/ntuser/ntuser.c
  25  *  REVISION HISTORY:
  26  *       16 July 2005   Created (hardon)
  27  */
  28
  29 /* INCLUDES ******************************************************************/
  30
  31 #include <w32k.h>
  32
  33 #define NDEBUG
  34 #include <debug.h>
  35
  36 ERESOURCE UserLock;
  37
  38 /* FUNCTIONS **********************************************************/
  39
  40
  41 NTSTATUS FASTCALL InitUserImpl(VOID)
  42 {
  43    NTSTATUS Status;
  44
  45    ExInitializeResourceLite(&UserLock);
  46
  47    if (!UserCreateHandleTable())
  48    {
  49       DPRINT1("Failed creating handle table\n");
  50       return STATUS_INSUFFICIENT_RESOURCES;
  51    }
  52
  53    Status = InitSessionImpl();
  54    if (!NT_SUCCESS(Status))
  55    {
  56       DPRINT1("Error init session impl.\n");
  57       return Status;
  58    }
  59
  60    if (!gpsi)
  61    {
  62       gpsi = UserHeapAlloc(sizeof(SERVERINFO));
  63       if (gpsi)
  64       {
  65          RtlZeroMemory(gpsi, sizeof(SERVERINFO));
  66          DPRINT("Global Server Data -> %x\n", gpsi);
  67       }
  68    }
  69    return STATUS_SUCCESS;
  70 }
  71
  72 /*
  73 RETURN
  74    True if current thread owns the lock (possibly shared)
  75 */
  76 BOOL FASTCALL UserIsEntered()
  77 {
  78    return ExIsResourceAcquiredExclusiveLite(&UserLock)
  79       || ExIsResourceAcquiredSharedLite(&UserLock);
  80 }
  81
  82 BOOL FASTCALL UserIsEnteredExclusive()
  83 {
  84    return ExIsResourceAcquiredExclusiveLite(&UserLock);
  85 }
  86
  87 VOID FASTCALL CleanupUserImpl(VOID)
  88 {
  89    ExDeleteResourceLite(&UserLock);
  90 }
  91
  92 VOID FASTCALL UserEnterShared(VOID)
  93 {
  94    KeEnterCriticalRegion();
  95    ExAcquireResourceSharedLite(&UserLock, TRUE);
  96 }
  97
  98 VOID FASTCALL UserEnterExclusive(VOID)
  99 {
 100    KeEnterCriticalRegion();
 101    ExAcquireResourceExclusiveLite(&UserLock, TRUE);
 102 }
 103
 104 VOID FASTCALL UserLeave(VOID)
 105 {
 106    ExReleaseResourceLite(&UserLock);
 107    KeLeaveCriticalRegion();
 108 }