129 lines
2.3 KiB
C
129 lines
2.3 KiB
C
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/*++
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Copyright (c) 1997-1999 Microsoft Corporation
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Module Name:
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notify.c
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Abstract:
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Manages KM to UM notification queue
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Author:
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AlanWar
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Environment:
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Kernel Mode
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Revision History:
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--*/
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#include "wmikmp.h"
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void WmipInitializeNotifications(
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void
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);
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void WmipEventNotification(
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IN PVOID Context
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(INIT,WmipInitializeNotifications)
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#pragma alloc_text(PAGE,WmipEventNotification)
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#endif
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WORK_QUEUE_ITEM WmipEventWorkQueueItem;
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LIST_ENTRY WmipNPEvent = {&WmipNPEvent, &WmipNPEvent};
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KSPIN_LOCK WmipNPNotificationSpinlock;
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LONG WmipEventWorkItems;
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#if DBG
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ULONG WmipNPAllocFail;
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#endif
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void WmipInitializeNotifications(
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void
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)
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{
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PAGED_CODE();
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ExInitializeWorkItem( &WmipEventWorkQueueItem,
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WmipEventNotification,
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NULL );
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KeInitializeSpinLock(&WmipNPNotificationSpinlock);
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}
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void WmipEventNotification(
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IN PVOID Context
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)
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/*++
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Routine Description:
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Work item routine to call WmipNotifyUserMode on behalf of an event fired
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by a driver
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Arguments:
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Context is not used
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Return Value:
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--*/
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{
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PWNODE_HEADER WnodeEventItem;
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PLIST_ENTRY NotificationPacketList;
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PREGENTRY RegEntry;
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PEVENTWORKCONTEXT EventContext;
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PAGED_CODE();
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do
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{
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NotificationPacketList = ExInterlockedRemoveHeadList(
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&WmipNPEvent,
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&WmipNPNotificationSpinlock);
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WmipAssert(NotificationPacketList != NULL);
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EventContext = (PEVENTWORKCONTEXT)
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CONTAINING_RECORD(NotificationPacketList,
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EVENTWORKCONTEXT,
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ListEntry);
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WnodeEventItem = EventContext->Wnode;
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//
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// Restore the Wnode->Version from ->ClientContext
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//
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WnodeEventItem->Version = WnodeEventItem->ClientContext;
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WnodeEventItem->ClientContext = 0;
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WnodeEventItem->Linkage = 0;
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WmipProcessEvent(WnodeEventItem,
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FALSE,
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TRUE);
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if (EventContext->RegEntry != NULL)
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{
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//
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// Unref for the ref count taken in IoWMIWriteEvent
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//
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WmipUnreferenceRegEntry(EventContext->RegEntry);
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}
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ExFreePool(EventContext);
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} while (InterlockedDecrement(&WmipEventWorkItems));
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}
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