184 lines
7.4 KiB
C++
184 lines
7.4 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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//=============================================================================
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#ifndef RELIABLETIMER_H
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#define RELIABLETIMER_H
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#include "tier0/dbg.h"
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//#include "constants.h"
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#include "tier0/fasttimer.h"
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#include "tier1/tier1.h"
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#include "tier1/strtools.h"
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#define DbgAssert Assert
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#define kMILLION (1000000)
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#define kTHOUSAND (1000)
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// Timer class that uses QueryPerformanceCounter. This is heavier-weight than CFastTimer which uses rdtsc,
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// but this is reliable on multi-core systems whereas CFastTimer is not.
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class CReliableTimer
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{
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public:
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CReliableTimer();
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void Start();
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void End();
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int64 GetMicroseconds();
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int64 GetMilliseconds();
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void SetLimit( uint64 m_cMicroSecDuration );
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bool BLimitReached();
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int64 CMicroSecOverage();
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int64 CMicroSecLeft();
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int64 CMilliSecLeft();
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private:
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int64 GetPerformanceCountNow();
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int64 m_nPerformanceCounterStart;
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int64 m_nPerformanceCounterEnd;
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int64 m_nPerformanceCounterLimit;
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static int64 sm_nPerformanceFrequency;
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static bool sm_bUseQPC;
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};
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//-----------------------------------------------------------------------------
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// Purpose: Records timer start time
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//-----------------------------------------------------------------------------
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inline void CReliableTimer::Start()
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{
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m_nPerformanceCounterStart = GetPerformanceCountNow();
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}
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//-----------------------------------------------------------------------------
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// Purpose: Records timer end time
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//-----------------------------------------------------------------------------
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inline void CReliableTimer::End()
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{
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m_nPerformanceCounterEnd = GetPerformanceCountNow();
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// enforce that we've advanced at least one cycle
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if ( m_nPerformanceCounterEnd < m_nPerformanceCounterStart )
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{
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#ifdef _SERVER
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if ( m_nPerformanceCounterEnd+10000 < m_nPerformanceCounterStart )
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AssertMsgOnce( false, CDbgFmtMsg( "CReliableTimer went backwards - start:%lld end:%lld", m_nPerformanceCounterStart, m_nPerformanceCounterEnd ).ToString() );
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#endif
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m_nPerformanceCounterEnd = m_nPerformanceCounterStart + 1;
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}
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}
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//-----------------------------------------------------------------------------
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// Purpose: Gets microseconds elapsed between start and end
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//-----------------------------------------------------------------------------
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inline int64 CReliableTimer::GetMicroseconds()
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{
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DbgAssert( m_nPerformanceCounterStart ); // timer must have been started
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DbgAssert( m_nPerformanceCounterEnd ); // timer must have been ended
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DbgAssert( 0 != sm_nPerformanceFrequency ); // must have calc'd performance counter frequency
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return ( ( m_nPerformanceCounterEnd - m_nPerformanceCounterStart ) * kMILLION / sm_nPerformanceFrequency );
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}
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//-----------------------------------------------------------------------------
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// Purpose: Gets microseconds elapsed between start and end
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//-----------------------------------------------------------------------------
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inline int64 CReliableTimer::GetMilliseconds()
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{
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DbgAssert( m_nPerformanceCounterStart ); // timer must have been started
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DbgAssert( m_nPerformanceCounterEnd ); // timer must have been ended
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DbgAssert( 0 != sm_nPerformanceFrequency ); // must have calc'd performance counter frequency
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return ( ( m_nPerformanceCounterEnd - m_nPerformanceCounterStart ) * kTHOUSAND / sm_nPerformanceFrequency );
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}
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//-----------------------------------------------------------------------------
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// Purpose: Sets a limit on this timer that can subsequently be checked against
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//-----------------------------------------------------------------------------
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inline void CReliableTimer::SetLimit( uint64 cMicroSecDuration )
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{
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DbgAssert( 0 != sm_nPerformanceFrequency ); // must have calc'd performance counter frequency
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m_nPerformanceCounterStart = GetPerformanceCountNow();
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m_nPerformanceCounterLimit = m_nPerformanceCounterStart + ( ( cMicroSecDuration * sm_nPerformanceFrequency ) / kMILLION );
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}
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//-----------------------------------------------------------------------------
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// Purpose: Returns if previously set limit has been reached
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//-----------------------------------------------------------------------------
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inline bool CReliableTimer::BLimitReached()
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{
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DbgAssert( m_nPerformanceCounterStart ); // SetLimit must have been called
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DbgAssert( m_nPerformanceCounterLimit ); // SetLimit must have been called
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int64 nPerformanceCountNow = GetPerformanceCountNow();
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// make sure time advances
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if ( nPerformanceCountNow < m_nPerformanceCounterStart )
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{
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#ifdef _SERVER
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if ( nPerformanceCountNow+10000 < m_nPerformanceCounterStart )
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AssertMsgOnce( false, CDbgFmtMsg( "CReliableTimer went backwards - start:%lld end:%lld", m_nPerformanceCounterStart, m_nPerformanceCounterEnd ).ToString() );
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#endif
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// reset the limit to be lower, to match our new clock
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m_nPerformanceCounterLimit = nPerformanceCountNow + (m_nPerformanceCounterLimit - m_nPerformanceCounterStart);
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}
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return ( nPerformanceCountNow >= m_nPerformanceCounterLimit );
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}
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//-----------------------------------------------------------------------------
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// Purpose: Returns microseconds current time is past limit, or 0 if not past limit
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//-----------------------------------------------------------------------------
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inline int64 CReliableTimer::CMicroSecOverage()
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{
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DbgAssert( m_nPerformanceCounterStart ); // SetLimit must have been called
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DbgAssert( m_nPerformanceCounterLimit ); // SetLimit must have been called
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int64 nPerformanceCountNow = GetPerformanceCountNow();
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#ifdef _SERVER
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if ( nPerformanceCountNow+10000 < m_nPerformanceCounterStart )
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AssertMsgOnce( nPerformanceCountNow >= m_nPerformanceCounterStart, CDbgFmtMsg( "CReliableTimer went backwards - start:%lld end:%lld", m_nPerformanceCounterStart, m_nPerformanceCounterEnd ).ToString() );
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#endif
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int64 nPerformanceCountOver = ( nPerformanceCountNow > m_nPerformanceCounterLimit ?
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nPerformanceCountNow - m_nPerformanceCounterLimit : 0 );
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Assert( 0 != sm_nPerformanceFrequency ); // must have calc'd performance counter frequency
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return ( nPerformanceCountOver * kMILLION / sm_nPerformanceFrequency );
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}
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//-----------------------------------------------------------------------------
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// Purpose: Returns microseconds remaining until limit
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//-----------------------------------------------------------------------------
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inline int64 CReliableTimer::CMicroSecLeft()
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{
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DbgAssert( m_nPerformanceCounterStart ); // SetLimit must have been called
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DbgAssert( m_nPerformanceCounterLimit ); // SetLimit must have been called
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int64 nPerformanceCountNow = GetPerformanceCountNow();
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#ifdef _SERVER
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if ( nPerformanceCountNow+10000 < m_nPerformanceCounterStart )
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AssertMsgOnce( nPerformanceCountNow >= m_nPerformanceCounterStart, CDbgFmtMsg( "CReliableTimer went backwards - start:%lld end:%lld", m_nPerformanceCounterStart, m_nPerformanceCounterEnd ).ToString() );
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#endif
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int64 nPerformanceCountLeft = ( nPerformanceCountNow < m_nPerformanceCounterLimit ?
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m_nPerformanceCounterLimit - nPerformanceCountNow : 0 );
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DbgAssert( 0 != sm_nPerformanceFrequency ); // must have calc'd performance counter frequency
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return ( nPerformanceCountLeft * kMILLION / sm_nPerformanceFrequency );
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}
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//-----------------------------------------------------------------------------
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// Purpose: Returns milliseconds remaining until limit
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//-----------------------------------------------------------------------------
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inline int64 CReliableTimer::CMilliSecLeft()
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{
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return CMicroSecLeft() / 1000;
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}
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#endif // TICKLIMITTIMER_H
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