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125 lines
3.6 KiB
125 lines
3.6 KiB
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1995.
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//
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// File: Idle.cxx
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//
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// Contents: Idle time tracker.
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//
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// Classes: CIdleTime
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//
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// History: 15-Nov-95 KyleP Created
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//
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//----------------------------------------------------------------------------
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#include <pch.cxx>
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#pragma hdrstop
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#include "idle.hxx"
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//+---------------------------------------------------------------------------
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//
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// Member: CIdleTime::CIdleTime, private
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//
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// Effects: Initialize idle time tracker.
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//
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// History: 15-Nov-95 KyleP Created
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//
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//----------------------------------------------------------------------------
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CIdleTime::CIdleTime()
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: _liLastIdleTime( 0 ),
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_liLastTotalTime( 0 ),
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_cProcessors( 0 )
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{
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NTSTATUS status = NtQuerySystemInformation(
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SystemProcessorPerformanceInformation,
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_aProcessorTime,
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sizeof(_aProcessorTime),
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&_cProcessors );
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if ( !NT_ERROR( status ) )
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{
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Win4Assert( _cProcessors % sizeof(_aProcessorTime[0]) == 0 );
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_cProcessors = _cProcessors / sizeof(_aProcessorTime[0]);
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for ( unsigned i = 0; i < _cProcessors; i++ )
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{
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_liLastIdleTime += _aProcessorTime[i].IdleTime.QuadPart;
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_liLastTotalTime += _aProcessorTime[i].KernelTime.QuadPart + _aProcessorTime[i].UserTime.QuadPart;
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}
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//
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// Don't check for overflow. This will overflow in about
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// 58K years!
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//
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Win4Assert( _liLastIdleTime < 0x0FFFFFFFFFFFFFFF );
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Win4Assert( _liLastTotalTime < 0x0FFFFFFFFFFFFFFF );
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}
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else
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{
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ciDebugOut(( DEB_ERROR, "NtQuerySystemInformation returned 0x%x\n", status ));
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_cProcessors = 0;
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}
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CIdleTime::PercentIdle, private
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//
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// Returns: Percent idle time since last call to this method.
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//
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// History: 15-Nov-95 KyleP Created
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//
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//----------------------------------------------------------------------------
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unsigned CIdleTime::PercentIdle()
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{
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unsigned pctIdle;
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NTSTATUS status = NtQuerySystemInformation (
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SystemProcessorPerformanceInformation,
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_aProcessorTime,
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sizeof(_aProcessorTime[0]) * _cProcessors,
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0 );
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if ( !NT_ERROR( status ) )
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{
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LONGLONG liIdleTime = 0;
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LONGLONG liTotalTime = 0;
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for ( unsigned i = 0; i < _cProcessors; i++ )
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{
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liIdleTime += _aProcessorTime[i].IdleTime.QuadPart;
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liTotalTime += _aProcessorTime[i].KernelTime.QuadPart + _aProcessorTime[i].UserTime.QuadPart;
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}
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Win4Assert( liIdleTime >= _liLastIdleTime );
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Win4Assert( liTotalTime >= _liLastTotalTime );
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pctIdle = (unsigned)((liIdleTime - _liLastIdleTime) * 100 / (1 + liTotalTime - _liLastTotalTime));
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_liLastIdleTime = liIdleTime;
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_liLastTotalTime = liTotalTime;
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//
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// Don't check for overflow. This will overflow in about
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// 58K years!
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//
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Win4Assert( _liLastIdleTime < 0x0FFFFFFFFFFFFFFF );
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Win4Assert( _liLastTotalTime < 0x0FFFFFFFFFFFFFFF );
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}
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else
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{
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ciDebugOut(( DEB_ERROR, "NtQuerySystemInformation returned 0x%x\n", status ));
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pctIdle = 0;
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}
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Win4Assert( pctIdle <= 100 );
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return pctIdle;
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}
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