reactos/subsys/win32k/ntuser/userobj.c

   1 /* $Id: userobj.c,v 1.1 2001/07/06 00:05:05 rex Exp $
   2  *
   3  * COPYRIGHT:        See COPYING in the top level directory
   4  * PROJECT:          ReactOS kernel
   5  * PURPOSE:          USER Object manager interface definition
   6  * FILE:             subsys/win32k/ntuser/userobj.c
   7  * PROGRAMER:        Rex Jolliff (rex@lvcablemodem.com)
   8  *
   9  */
  10
  11 #undef WIN32_LEAN_AND_MEAN
  12 #include <windows.h>
  13 #define NDEBUG
  14 #include <debug.h>
  15 #include <ddk/ntddk.h>
  16 #include <win32k/userobj.h>
  17
  18 static  LIST_ENTRY  UserObjectList;
  19
  20 PUSER_OBJECT  USEROBJ_AllocObject (WORD size, WORD magic)
  21 {
  22   PUSER_OBJECT_HEADER  newObject;
  23
  24   newObject = ExAllocatePoolWithTag(PagedPool,
  25                                     size + sizeof (USER_OBJECT_HEADER),
  26                                     USER_OBJECT_TAG);
  27   if (newObject == 0)
  28   {
  29     return  0;
  30   }
  31   RtlZeroMemory(newObject, size + sizeof (USER_OBJECT_HEADER));
  32
  33   newObject->magic = magic;
  34   ExInitializeFastMutex (&newObject->mutex);
  35   InsertTailList (&UserObjectList, &newObject->listEntry);
  36
  37   return  UserObjectHeaderToBody (newObject);
  38 }
  39
  40 BOOL  USEROBJ_FreeObject (PUSER_OBJECT object, WORD magic)
  41 {
  42   PUSER_OBJECT_HEADER  objectHeader;
  43
  44   if (object == NULL)
  45   {
  46     return FALSE;
  47   }
  48   objectHeader = UserObjectBodyToHeader (object);
  49   if (objectHeader->magic != magic)
  50   {
  51     return  FALSE;
  52   }
  53   RemoveEntryList (&objectHeader->listEntry);
  54   ExFreePool (objectHeader);
  55
  56   return  TRUE;
  57 }
  58
  59 HUSEROBJ  USEROBJ_PtrToHandle (PUSER_OBJECT  object, WORD  magic)
  60 {
  61   PUSER_OBJECT_HEADER  objectHeader;
  62
  63   if (object == 0)
  64   {
  65     return  0;
  66   }
  67   objectHeader = UserObjectBodyToHeader (object);
  68   if (objectHeader->magic != magic)
  69   {
  70     return  0;
  71   }
  72
  73   return  UserObjectHeaderToHandle(objectHeader);
  74 }
  75
  76 PUSER_OBJECT  USEROBJ_HandleToPtr (HUSEROBJ  handle, WORD  magic)
  77 {
  78   PUSER_OBJECT_HEADER  objectHeader;
  79
  80   if (handle == 0)
  81   {
  82     return  0;
  83   }
  84   objectHeader = UserObjectHandleToHeader (handle);
  85   if ((objectHeader->magic != magic) &&
  86       (magic != UO_MAGIC_DONTCARE))
  87   {
  88     return  0;
  89   }
  90
  91   return  UserObjectHeaderToBody (objectHeader);
  92 }
  93
  94 BOOL  USEROBJ_LockObject (HUSEROBJ  objectHandle)
  95 {
  96   PUSER_OBJECT_HEADER  objectHeader;
  97
  98   if (objectHandle == 0)
  99   {
 100     return  FALSE;
 101   }
 102   objectHeader = UserObjectHandleToHeader (objectHandle);
 103
 104   ExAcquireFastMutexUnsafe (&objectHeader->mutex);
 105
 106   return  TRUE;
 107 }
 108
 109 BOOL  USEROBJ_UnlockObject (HUSEROBJ  objectHandle)
 110 {
 111   PUSER_OBJECT_HEADER  objectHeader;
 112
 113   if (objectHandle == 0)
 114   {
 115     return  FALSE;
 116   }
 117   objectHeader = UserObjectHandleToHeader (objectHandle);
 118
 119   ExReleaseFastMutexUnsafe (&objectHeader->mutex);
 120
 121   return  TRUE;
 122 }
 123
 124
 125