112 lines
3.1 KiB
C++
112 lines
3.1 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1996-2000.
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//
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// File: timlimit.hxx
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//
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// Contents: Class to monitor execution time of a query
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//
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// Classes: CTimeLimit
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//
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// History: 09 Jul 1996 AlanW 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: CTimeLimit
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//
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// Purpose: Monitor elapsed execution time of a query
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//
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// History: 09 Jul 1996 AlanW Created
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//
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//----------------------------------------------------------------------------
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class CTimeLimit
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{
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public:
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CTimeLimit( ULONG ulMaxExecutionTime, ULONG ulMaxTimeOverride );
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CTimeLimit( CTimeLimit & TimeLim ) :
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_ullExecutionTimeLimit( TimeLim._ullExecutionTimeLimit ),
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_ullBaselineTime( TimeLim._ullBaselineTime ),
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_fDisableCheck( TimeLim._fDisableCheck )
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{ }
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void SetBaselineTime( );
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inline void SetMaxOverrideTime( ULONG ulMaxTimeOverride );
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BOOL CheckExecutionTime( ULONGLONG *pullTimeslice = 0 );
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void DisableCheck() { _fDisableCheck = TRUE; }
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void EnableCheck() { _fDisableCheck = FALSE; }
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BOOL CheckDisabled() { return _fDisableCheck; }
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void SetExecutionTime( ULONGLONG ullExecutionTimeLimit ) { _ullExecutionTimeLimit = ullExecutionTimeLimit; }
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BOOL IsTimedOut( ) { return _fDisableCheck ? FALSE : ( _ullExecutionTimeLimit == 0 ); }
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BOOL IsNoTimeOut( ) { return ( _UI64_MAX == _ullExecutionTimeLimit ); }
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private:
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ULONGLONG _ullExecutionTimeLimit;// Execution time limit (100 nsec)
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ULONGLONG _ullBaselineTime; // Execution time snapshot (100 nsec)
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BOOL _fDisableCheck;
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};
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//+---------------------------------------------------------------------------
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//
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// Member: CTimeLimit::SetMaxOverrideTime, public
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//
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// Synopsis: Set a high-water mark for time limit
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//
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// Arguments: [ulMaxTimeOverride] - upper bound on ulExecutionTimeLimit (in msec)
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//
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// History: 22-Jan-1998 KyleP Created
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//
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// Note: Calling this method *after* the first call to CheckExecutionTime
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// will result in some time potentially being uncounted between
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// construction and the call to SetMaxOverrideTime.
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//
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//----------------------------------------------------------------------------
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inline void CTimeLimit::SetMaxOverrideTime( ULONG ulMaxTimeOverride )
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{
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#if CIDBG == 1
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//
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// Undo artificial increment, just to make computation more straightforward.
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//
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if ( ciInfoLevel > 7 || vqInfoLevel > 7)
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{
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if (_UI64_MAX != _ullExecutionTimeLimit)
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_ullExecutionTimeLimit /= 50;
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}
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#endif
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if ( ulMaxTimeOverride > 0 )
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_ullExecutionTimeLimit = min( _ullExecutionTimeLimit, ulMaxTimeOverride * 10000 );
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#if DBG || CIDBG
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//
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// Debugs are time-costly...
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//
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if ( ciInfoLevel > 7 || vqInfoLevel > 7 )
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{
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if (_UI64_MAX != _ullExecutionTimeLimit)
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_ullExecutionTimeLimit *= 50;
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}
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#endif // DBG || CIDBG
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}
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