You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
125 lines
3.7 KiB
125 lines
3.7 KiB
//+---------------------------------------------------------------------------
|
|
//
|
|
// Microsoft Windows
|
|
// Copyright (C) Microsoft Corporation, 1995.
|
|
//
|
|
// File: Idle.cxx
|
|
//
|
|
// Contents: Idle time tracker.
|
|
//
|
|
// Classes: CIdleTime
|
|
//
|
|
// History: 15-Nov-95 KyleP Created
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
#include <pch.cxx>
|
|
#pragma hdrstop
|
|
|
|
#include "idle.hxx"
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CIdleTime::CIdleTime, private
|
|
//
|
|
// Effects: Initialize idle time tracker.
|
|
//
|
|
// History: 15-Nov-95 KyleP Created
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
CIdleTime::CIdleTime()
|
|
: _liLastIdleTime( 0 ),
|
|
_liLastTotalTime( 0 ),
|
|
_cProcessors( 0 )
|
|
{
|
|
NTSTATUS status = NtQuerySystemInformation(
|
|
SystemProcessorPerformanceInformation,
|
|
_aProcessorTime,
|
|
sizeof(_aProcessorTime),
|
|
&_cProcessors );
|
|
|
|
if ( !NT_ERROR( status ) )
|
|
{
|
|
Win4Assert( _cProcessors % sizeof(_aProcessorTime[0]) == 0 );
|
|
|
|
_cProcessors = _cProcessors / sizeof(_aProcessorTime[0]);
|
|
|
|
for ( unsigned i = 0; i < _cProcessors; i++ )
|
|
{
|
|
_liLastIdleTime += _aProcessorTime[i].IdleTime.QuadPart;
|
|
_liLastTotalTime += _aProcessorTime[i].KernelTime.QuadPart + _aProcessorTime[i].UserTime.QuadPart;
|
|
}
|
|
|
|
//
|
|
// Don't check for overflow. This will overflow in about
|
|
// 58K years!
|
|
//
|
|
|
|
Win4Assert( _liLastIdleTime < 0x0FFFFFFFFFFFFFFF );
|
|
Win4Assert( _liLastTotalTime < 0x0FFFFFFFFFFFFFFF );
|
|
}
|
|
else
|
|
{
|
|
ciDebugOut(( DEB_ERROR, "NtQuerySystemInformation returned 0x%x\n", status ));
|
|
_cProcessors = 0;
|
|
}
|
|
}
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CIdleTime::PercentIdle, private
|
|
//
|
|
// Returns: Percent idle time since last call to this method.
|
|
//
|
|
// History: 15-Nov-95 KyleP Created
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
unsigned CIdleTime::PercentIdle()
|
|
{
|
|
unsigned pctIdle;
|
|
|
|
NTSTATUS status = NtQuerySystemInformation (
|
|
SystemProcessorPerformanceInformation,
|
|
_aProcessorTime,
|
|
sizeof(_aProcessorTime[0]) * _cProcessors,
|
|
0 );
|
|
|
|
if ( !NT_ERROR( status ) )
|
|
{
|
|
LONGLONG liIdleTime = 0;
|
|
LONGLONG liTotalTime = 0;
|
|
|
|
for ( unsigned i = 0; i < _cProcessors; i++ )
|
|
{
|
|
liIdleTime += _aProcessorTime[i].IdleTime.QuadPart;
|
|
liTotalTime += _aProcessorTime[i].KernelTime.QuadPart + _aProcessorTime[i].UserTime.QuadPart;
|
|
}
|
|
|
|
Win4Assert( liIdleTime >= _liLastIdleTime );
|
|
Win4Assert( liTotalTime >= _liLastTotalTime );
|
|
|
|
pctIdle = (unsigned)((liIdleTime - _liLastIdleTime) * 100 / (1 + liTotalTime - _liLastTotalTime));
|
|
|
|
_liLastIdleTime = liIdleTime;
|
|
_liLastTotalTime = liTotalTime;
|
|
|
|
//
|
|
// Don't check for overflow. This will overflow in about
|
|
// 58K years!
|
|
//
|
|
|
|
Win4Assert( _liLastIdleTime < 0x0FFFFFFFFFFFFFFF );
|
|
Win4Assert( _liLastTotalTime < 0x0FFFFFFFFFFFFFFF );
|
|
}
|
|
else
|
|
{
|
|
ciDebugOut(( DEB_ERROR, "NtQuerySystemInformation returned 0x%x\n", status ));
|
|
pctIdle = 0;
|
|
}
|
|
|
|
Win4Assert( pctIdle <= 100 );
|
|
|
|
return pctIdle;
|
|
}
|