51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1997
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//
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// File: PropLock.hxx
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//
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// Contents: Property store record locking class
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//
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// Classes: CPropertyLockMgr
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//
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// History: 23-Feb-96 dlee Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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//+-------------------------------------------------------------------------
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//
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// Class: CPropertyLockMgr
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//
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// Purpose: Handles locking for records in the property store
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//
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// History: 23-Feb-96 dlee Created
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//
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//----------------------------------------------------------------------------
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class CPropertyLockMgr
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{
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public:
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CPropertyLockMgr() { RtlZeroMemory( _aRecords, sizeof _aRecords ); }
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CReadWriteLockRecord & GetRecord( WORKID wid )
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{
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return _aRecords[ wid & ( cWidHash - 1 ) ];
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}
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// Return the number of unique records used to implement locking
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ULONG UniqueRecordCount() { return cWidHash; }
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// Always return the bucket you are computing in GetRecord...
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ULONG RecordIdForWid( WORKID wid ) { return wid & (cWidHash - 1); }
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private:
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enum { cWidHash = 256 };
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CReadWriteLockRecord _aRecords[ cWidHash ];
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};
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