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Fix race condition

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svn path=/trunk/; revision=8335
This commit is contained in:
Gé van Geldorp
2004-02-23 20:08:35 +00:00
parent 7a4c78bd4d
commit 405c0e0d5a
1 changed files with 15 additions and 13 deletions
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reactos/subsys/win32k/ntuser/msgqueue.c
+15 -13
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@@ -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: msgqueue.c,v 1.68 2004/02/22 12:25:02 navaraf Exp $
/* $Id: msgqueue.c,v 1.69 2004/02/23 20:08:35 gvg Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@@ -447,6 +447,19 @@ MsqPeekHardwareMessage(PUSER_MESSAGE_QUEUE MessageQueue, HWND hWnd,
DesktopWindow = IntGetWindowObject(IntGetDesktopWindow());
WaitObjects[1] = &MessageQueue->NewMessages;
WaitObjects[0] = &HardwareMessageQueueLock;
do
{
WaitStatus = KeWaitForMultipleObjects(2, WaitObjects, WaitAny, UserRequest,
UserMode, TRUE, NULL, NULL);
while (MsqDispatchOneSentMessage(MessageQueue))
{
;
}
}
while (NT_SUCCESS(WaitStatus) && STATUS_WAIT_0 != WaitStatus);
/* Process messages in the message queue itself. */
ExAcquireFastMutex(&MessageQueue->HardwareLock);
CurrentEntry = MessageQueue->HardwareMessagesListHead.Flink;
@@ -469,6 +482,7 @@ MsqPeekHardwareMessage(PUSER_MESSAGE_QUEUE MessageQueue, HWND hWnd,
RemoveEntryList(&Current->ListEntry);
}
ExReleaseFastMutex(&MessageQueue->HardwareLock);
KeReleaseMutex(&HardwareMessageQueueLock, FALSE);
*Message = Current;
IntReleaseWindowObject(DesktopWindow);
return(TRUE);
@@ -481,18 +495,6 @@ MsqPeekHardwareMessage(PUSER_MESSAGE_QUEUE MessageQueue, HWND hWnd,
ExReleaseFastMutex(&MessageQueue->HardwareLock);
/* Now try the global queue. */
WaitObjects[1] = &MessageQueue->NewMessages;
WaitObjects[0] = &HardwareMessageQueueLock;
do
{
WaitStatus = KeWaitForMultipleObjects(2, WaitObjects, WaitAny, UserRequest,
UserMode, TRUE, NULL, NULL);
while (MsqDispatchOneSentMessage(MessageQueue))
{
;
}
}
while (NT_SUCCESS(WaitStatus) && STATUS_WAIT_0 != WaitStatus);
/* Transfer all messages from the DPC accessible queue to the main queue. */
KeAcquireSpinLock(&SystemMessageQueueLock, &OldIrql);