subsys/win32k/ntuser/guicheck.c

   1  /* $Id$
   2  *
   3  * COPYRIGHT:        See COPYING in the top level directory
   4  * PROJECT:          ReactOS kernel
   5  * PURPOSE:          GUI state check
   6  * FILE:             subsys/win32k/ntuser/guicheck.c
   7  * PROGRAMER:        Casper S. Hornstrup (chorns@users.sourceforge.net)
   8  * NOTES:            The GuiCheck() function performs a few delayed operations:
   9  *                   1) A GUI process is assigned a window station
  10  *                   2) A message queue is created for a GUI thread before use
  11  *                   3) The system window classes are registered for a process
  12  * REVISION HISTORY:
  13  *       06-06-2001  CSH  Created
  14  */
  15
  16 /* INCLUDES ******************************************************************/
  17
  18 #include <ddk/ntddk.h>
  19 #include <napi/teb.h>
  20 #include <win32k/win32k.h>
  21 #include <include/guicheck.h>
  22 #include <include/msgqueue.h>
  23 #include <include/object.h>
  24 #include <napi/win32.h>
  25 #include <include/winsta.h>
  26
  27 #define NDEBUG
  28 #include <debug.h>
  29
  30 /* GLOBALS *******************************************************************/
  31
  32 static ULONG NrGuiApplicationsRunning = 0;
  33
  34 /* FUNCTIONS *****************************************************************/
  35
  36 VOID
  37 W32kGraphicsCheck(VOID)
  38 {
  39   if (NrGuiApplicationsRunning == 0)
  40     {
  41       W32kInitializeDesktopGraphics();
  42     }
  43   NrGuiApplicationsRunning++;
  44 }
  45
  46 VOID
  47 W32kGuiCheck(VOID)
  48 {
  49   if (PsGetWin32Process() == NULL)
  50     {
  51       NTSTATUS Status;
  52
  53       PsCreateWin32Process(PsGetCurrentProcess());
  54
  55       InitializeListHead(&PsGetWin32Process()->ClassListHead);
  56       ExInitializeFastMutex(&PsGetWin32Process()->ClassListLock);
  57
  58       Status =
  59         ValidateWindowStationHandle(PROCESS_WINDOW_STATION(),
  60                                     UserMode,
  61                                     GENERIC_ALL,
  62                                     &PsGetWin32Process()->WindowStation);
  63       if (!NT_SUCCESS(Status))
  64         {
  65           DbgPrint("W32K: Failed to reference a window station for "
  66                    "process.\n");
  67         }
  68     }
  69
  70   if (PsGetWin32Thread() == NULL)
  71     {
  72       NTSTATUS Status;
  73
  74       PsCreateWin32Thread(PsGetCurrentThread());
  75       PsGetWin32Thread()->MessageQueue = MsqCreateMessageQueue();
  76       InitializeListHead(&PsGetWin32Thread()->WindowListHead);
  77       ExInitializeFastMutex(&PsGetWin32Thread()->WindowListLock);
  78
  79       /* By default threads get assigned their process's desktop. */
  80       PsGetWin32Thread()->Desktop = NULL;
  81       Status = ObReferenceObjectByHandle(PsGetCurrentProcess()->Win32Desktop,
  82                                          GENERIC_ALL,
  83                                          ExDesktopObjectType,
  84                                          UserMode,
  85                                          (PVOID*)&PsGetWin32Thread()->Desktop,
  86                                          NULL);
  87       if (!NT_SUCCESS(Status))
  88         {
  89           DbgPrint("W32K: Failed to reference a desktop for thread.\n");
  90         }
  91     }
  92 }
  93
  94 /* EOF */