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Fix race condition when one thread changes the update region of a window

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and another thread retrieves a paint message for that window.

svn path=/trunk/; revision=8033
This commit is contained in:
Gé van Geldorp 2004-02-04 23:01:07 +00:00
parent 969bf0b926
commit 8fdb9cdcc1
3 changed files with 25 additions and 6 deletions
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2
reactos/subsys/win32k/include/window.h
View file

@ -59,6 +59,8 @@ typedef struct _WINDOW_OBJECT
/* Handle of region of the window to be updated. */
HANDLE UpdateRegion;
HANDLE NCUpdateRegion;
/* Lock to be held when manipulating (NC)UpdateRegion */
FAST_MUTEX UpdateLock;
/* Pointer to the owning thread's message queue. */
PUSER_MESSAGE_QUEUE MessageQueue;
struct _WINDOW_OBJECT* FirstChild;

26
reactos/subsys/win32k/ntuser/painting.c
View file

@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: painting.c,v 1.66 2004/02/03 17:53:55 navaraf Exp $
* $Id: painting.c,v 1.67 2004/02/04 23:01:07 gvg Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -52,7 +52,7 @@
#include <include/intgdi.h>
#define NDEBUG
#include <debug.h>
#include <win32k/debug1.h>
/* PRIVATE FUNCTIONS **********************************************************/
@ -68,6 +68,7 @@ IntValidateParent(PWINDOW_OBJECT Child, HRGN ValidRegion)
ParentWindow = IntGetWindowObject(Parent);
if (ParentWindow && !(ParentWindow->Style & WS_CLIPCHILDREN))
{
ExAcquireFastMutex(&ParentWindow->UpdateLock);
if (ParentWindow->UpdateRegion != 0)
{
INT OffsetX, OffsetY;
@ -84,6 +85,7 @@ IntValidateParent(PWINDOW_OBJECT Child, HRGN ValidRegion)
/* FIXME: If the resulting region is empty, remove fake posted paint message */
NtGdiOffsetRgn(ValidRegion, -OffsetX, -OffsetY);
}
ExReleaseFastMutex(&ParentWindow->UpdateLock);
}
IntReleaseWindowObject(ParentWindow);
Parent = NtUserGetAncestor(Parent, GA_PARENT);
@ -104,12 +106,14 @@ IntValidateParent(PWINDOW_OBJECT Child, HRGN ValidRegion)
* as valid, clears the WINDOWOBJECT_NEED_NCPAINT flag.
*/
HRGN FASTCALL
STATIC HRGN FASTCALL
IntGetNCUpdateRegion(PWINDOW_OBJECT Window)
{
HRGN WindowRgn;
HRGN NonclientRgn;
ASSERT(! ExTryToAcquireFastMutex(&Window->UpdateLock));
/*
* Generate the update region.
*/
@ -148,7 +152,7 @@ IntGetNCUpdateRegion(PWINDOW_OBJECT Window)
* Internal function used by IntRedrawWindow.
*/
VOID FASTCALL
STATIC VOID FASTCALL
IntPaintWindows(PWINDOW_OBJECT Window, ULONG Flags)
{
HDC hDC;
@ -163,6 +167,7 @@ IntPaintWindows(PWINDOW_OBJECT Window, ULONG Flags)
{
if (Window->Flags & WINDOWOBJECT_NEED_NCPAINT)
{
ExAcquireFastMutex(&Window->UpdateLock);
if (Window->NCUpdateRegion)
{
IntValidateParent(Window, Window->NCUpdateRegion);
@ -171,6 +176,7 @@ IntPaintWindows(PWINDOW_OBJECT Window, ULONG Flags)
Window->NCUpdateRegion = NULL;
Window->Flags &= ~WINDOWOBJECT_NEED_NCPAINT;
MsqDecPaintCountQueue(Window->MessageQueue);
ExReleaseFastMutex(&Window->UpdateLock);
}
if (Window->Flags & WINDOWOBJECT_NEED_ERASEBKGND)
@ -197,6 +203,7 @@ IntPaintWindows(PWINDOW_OBJECT Window, ULONG Flags)
Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT)
{
IntSendMessage(hWnd, WM_PAINT, 0, 0);
ExAcquireFastMutex(&Window->UpdateLock);
if (Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT)
{
Window->Flags &= ~WINDOWOBJECT_NEED_INTERNALPAINT;
@ -205,6 +212,7 @@ IntPaintWindows(PWINDOW_OBJECT Window, ULONG Flags)
MsqDecPaintCountQueue(Window->MessageQueue);
}
}
ExReleaseFastMutex(&Window->UpdateLock);
}
}
}
@ -282,6 +290,7 @@ IntInvalidateWindows(PWINDOW_OBJECT Window, HRGN hRgn, ULONG Flags)
* Save current state of pending updates
*/
ExAcquireFastMutex(&Window->UpdateLock);
HadPaintMessage = Window->UpdateRegion != NULL ||
Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT;
HadNCPaintMessage = Window->Flags & WINDOWOBJECT_NEED_NCPAINT;
@ -418,6 +427,8 @@ IntInvalidateWindows(PWINDOW_OBJECT Window, HRGN hRgn, ULONG Flags)
else
MsqIncPaintCountQueue(Window->MessageQueue);
}
ExReleaseFastMutex(&Window->UpdateLock);
}
/*
@ -614,15 +625,17 @@ IntGetPaintMessage(HWND hWnd, PW32THREAD Thread, MSG *Message,
#if 0
DPRINT1("PAINTING BUG: Thread marked as containing dirty windows, but no dirty windows found!\n");
#endif
/* FIXME: Lock the queue! */
ExAcquireFastMutex(&MessageQueue->Lock);
MessageQueue->PaintPosted = 0;
MessageQueue->PaintCount = 0;
ExReleaseFastMutex(&MessageQueue->Lock);
return FALSE;
}
Window = IntGetWindowObject(Message->hwnd);
if (Window != NULL)
{
ExAcquireFastMutex(&Window->UpdateLock);
if (Window->Flags & WINDOWOBJECT_NEED_NCPAINT)
{
Message->message = WM_NCPAINT;
@ -647,6 +660,7 @@ IntGetPaintMessage(HWND hWnd, PW32THREAD Thread, MSG *Message,
}
}
}
ExReleaseFastMutex(&Window->UpdateLock);
IntReleaseWindowObject(Window);
return TRUE;
@ -724,6 +738,7 @@ NtUserBeginPaint(HWND hWnd, PAINTSTRUCT* lPs)
return NULL;
}
ExAcquireFastMutex(&Window->UpdateLock);
if (Window->UpdateRegion != NULL)
{
MsqDecPaintCountQueue(Window->MessageQueue);
@ -739,6 +754,7 @@ NtUserBeginPaint(HWND hWnd, PAINTSTRUCT* lPs)
{
NtUserGetClientRect(Window, &lPs->rcPaint);
}
ExReleaseFastMutex(&Window->UpdateLock);
if (Window->Flags & WINDOWOBJECT_NEED_ERASEBKGND)
{

3
reactos/subsys/win32k/ntuser/window.c
View file

@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: window.c,v 1.180 2004/02/04 01:10:25 rcampbell Exp $
/* $Id: window.c,v 1.181 2004/02/04 23:01:07 gvg Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -1251,6 +1251,7 @@ NtUserCreateWindowEx(DWORD dwExStyle,
InitializeListHead(&WindowObject->PropListHead);
ExInitializeFastMutex(&WindowObject->PropListLock);
ExInitializeFastMutex(&WindowObject->ChildrenListLock);
ExInitializeFastMutex(&WindowObject->UpdateLock);
RtlInitUnicodeString(&WindowObject->WindowName, WindowName.Buffer);