[sgasiorek] 74142: [NTUSER] Lock before getting DesktopDC. Fixes crash during loading DirectX CORE-7733

Author: sgasiorek
Date: Fri Mar 10 16:33:45 2017
New Revision: 74142

URL: http://svn.reactos.org/svn/reactos?rev=74142&view=rev
Log:
[NTUSER] Lock before getting DesktopDC. Fixes crash during loading DirectX CORE-7733

Modified:
    trunk/reactos/win32ss/user/ntuser/desktop.c

Modified: trunk/reactos/win32ss/user/ntuser/desktop.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/win32ss/user/ntuser/deskto…
==============================================================================
--- trunk/reactos/win32ss/user/ntuser/desktop.c	[iso-8859-1] (original)
+++ trunk/reactos/win32ss/user/ntuser/desktop.c	[iso-8859-1] Fri Mar 10 16:33:45 2017
@@ -932,6 +932,8 @@
     PWND DesktopObject = 0;
     HDC DesktopHDC = 0;
 
+    UserEnterExclusive();
+
     if (DcType == DC_TYPE_DIRECT)
     {
         DesktopObject = UserGetDesktopWindow();
@@ -942,6 +944,8 @@
         PMONITOR pMonitor = UserGetPrimaryMonitor();
         DesktopHDC = IntGdiCreateDisplayDC(pMonitor->hDev, DcType, EmptyDC);
     }
+
+    UserLeave();
 
     return DesktopHDC;
 }