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78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
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/*++
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Copyright (c) Microsoft. All rights reserved.
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Module Name:
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EventQueueUm.cpp
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Abstract:
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This module implements user mode specific functionality of event queue
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This functionality needed to be separated out since the KM portion takes
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a reference on driver object because KM MxWorkItem::_Free does not wait for
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callback to return (i.e. rundown synchronously).
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MxWorkItem::_Free in UM currently waits for callback to return (i.e. runs
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down synchronously) hence does not need a reference on driver/devstack
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object (see comments on top of MxWorkItemUm.h file).
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In future if UM work-item is made similar to km workitem, UMDF may need to
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ensure that modules stay loaded, though the mechanism to ensure that would
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likely be different from a reference on the driver. It would likely be a
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reference on the devicestack object.
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Environment:
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User mode only
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Revision History:
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--*/
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#include "pnppriv.hpp"
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VOID
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FxWorkItemEventQueue::QueueWorkItem(
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VOID
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)
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{
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//
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// In user mode WorkItem::_Free waits for workitem callbacks to return
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// So we don't need outstanding reference on driver object or the devstack
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//
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m_WorkItem.Enqueue(
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(PMX_WORKITEM_ROUTINE) _WorkItemCallback,
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(FxEventQueue*) this);
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}
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VOID
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FxWorkItemEventQueue::_WorkItemCallback(
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__in MdDeviceObject DeviceObject,
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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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This is the work item that attempts to run the machine on a thread
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separate from the one the caller was using. It implements step 9 above.
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--*/
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{
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FxWorkItemEventQueue* This = (FxWorkItemEventQueue*) Context;
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UNREFERENCED_PARAMETER(DeviceObject);
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//
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// In user mode WorkItem::_Free waits for workitem callbacks to return
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// So we don't need outstanding reference on driver object
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//
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This->EventQueueWorker();
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}
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