124 lines
3.8 KiB
C++
124 lines
3.8 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1995.
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//
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// File: abktize.hxx
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//
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// Contents: A class capable of doing asynchronous bucket->window
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// expansion. It can be queued as a work item. For synchronous
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// bucket->window conversions, it can be called from the client
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// thread itself.
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//
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// Classes: CAsyncBucketExploder
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//
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// History: 5-25-95 srikants Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <worker.hxx>
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#include <segmru.hxx>
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class CLargeTable;
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class CTableBucket;
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class CQAsyncExecute;
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const LONGLONG eSigCAsyncBucketExploder = 0x74656b6375424151i64; // "QABucket"
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//+---------------------------------------------------------------------------
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//
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// Class: CAsyncBucketExploder
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//
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// Purpose: To co-ordinate the bucket->explosion between the query
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// object and the large table. It can be a work item on the
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// work queue.
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//
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// History: 5-25-95 srikants Created
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//
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// Notes: To prevent a deadlock, NEVER hold the lock on this object
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// and then call into the large table methods.
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//
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//----------------------------------------------------------------------------
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class CAsyncBucketExploder : INHERIT_VIRTUAL_UNWIND, public CDoubleLink, public PWorkItem
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{
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INLINE_UNWIND( CAsyncBucketExploder )
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public:
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CAsyncBucketExploder( CLargeTable & largeTable,
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XPtr<CTableBucket>& xBucket,
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WORKID widToPin,
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BOOL fDoWidToPath );
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virtual ~CAsyncBucketExploder();
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//
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// virtual methods from PWorkItem
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//
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void DoIt( CWorkThread * PThread );
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void AddRef();
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void Release();
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//
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// Called when the query is being aborted to release the workitem
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// from the work queue.
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//
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void Abort();
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//
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// Giving the query object to use for bucket->window conversion.
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//
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void SetQuery( CQAsyncExecute * pQExecute );
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//
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// Called to add this item to query's work queue.
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//
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void AddToWorkQueue();
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void WaitForCompletion()
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{
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_evt.Wait();
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}
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void SetOnLTList();
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WORKID GetWorkIdToPin() const { return _widToPin; }
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NTSTATUS GetStatus() const { return _status; }
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# ifdef CIEXTMODE
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void CiExtDump(void *ciExtSelf);
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# endif
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private:
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CLargeTable & _largeTable; // LargeTable that is driving the
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// bucket to window conversion.
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CTableBucket * _pBucket; // The bucket to be expanded.
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WORKID _widToPin; // WORKID that is pinned for this
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// expansion.
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BOOL _fDoWidToPath; // TRUE if Wid-to-path expansion needed
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CQAsyncExecute * _pQueryExecute; // The query object that will be used
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// to explode the bucket.
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LONG _refCount;
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CEventSem _evt; // Event for notifying the completion
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// or abort of the conversion.
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CMutexSem _mutex; // Mutex for serialization.
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BOOL _fOnWorkQueue; // Set to TRUE when this object is on
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// the work queue.
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BOOL _fOnLTList; // Set to TRUE when this object is on
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// the large table's list of exploding
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// buckets.
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NTSTATUS _status; // Status of the operation.
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};
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typedef class TDoubleList<CAsyncBucketExploder> CAsyncBucketsList;
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typedef class TFwdListIter<CAsyncBucketExploder, CAsyncBucketsList> CFwdAsyncBktsIter;
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