Mercurial > vba-linux

     1 // CPerfTimer - a simple Win32 performance counter wrapper

     2 // by Dean Wyant dwyant@mindspring.com

     3 

     4 /*

     5 

     6 This class is simple to use. Just declare a variable(s) as type CPerfTimer,

     7 call Start() to start timimg and call Stop() to stop timimg. You can pause a

     8 timer by calling Stop() and then you can call Start() to resume. Retrieve the

     9 elapsed time by calling an Elapsed..() function. Assignment, addition, 

    10 subtraction and comparison are supported. There are a few information calls

    11 available also. All calls except Start and Stop can be performed on a timer

    12 without stopping it.

    13 

    14 */

    15 

    16 #ifndef __PERFTIMER_H__

    17 #define __PERFTIMER_H__

    18 

    19 class CPerfTimer

    20 {

    21 public:

    22 	CPerfTimer(BOOL bStart = FALSE) {Init(bStart);}

    23 

    24 	CPerfTimer(const CPerfTimer& Src); 

    25 

    26 	virtual ~CPerfTimer() {;}

    27 

    28 	void Start(BOOL bReset = FALSE);   // Start from current value or optionally from 0

    29 	void Stop();                       // Stop timing. Use Start afterwards to continue.

    30 

    31 	BOOL IsRunning();                  // Returns FALSE if stopped.

    32 

    33 	BOOL IsSupported();                // Returns FALSE if performance counter not supported.

    34 	// Call after constructing at least one CPerfTimer

    35 

    36 	const double Resolution();         // Returns timer resolution in seconds

    37 	const double Resolutionms();       // Returns timer resolution in milliseconds

    38 	const double Resolutionus();       // Returns timer resolution in microseconds

    39 

    40 	const double Elapsed();            // Returns elapsed time in seconds

    41 	const double Elapsedms();          // Returns elapsed time in milliseconds 

    42 	const double Elapsedus();          // Returns elapsed time in microseconds

    43 

    44 	const CPerfTimer& operator=(const CPerfTimer& Src); // Assignment operator 

    45 

    46 	// Math operators

    47 	CPerfTimer operator+(const CPerfTimer& Src) const;

    48 	CPerfTimer operator-(const CPerfTimer& Src) const;

    49 	const CPerfTimer& operator+=(const CPerfTimer& Src);

    50 	const CPerfTimer& operator-=(const CPerfTimer& Src);

    51 	// For time in seconds

    52 	CPerfTimer operator+(const double Secs) const;

    53 	CPerfTimer operator-(const double Secs) const;

    54 	const CPerfTimer& operator+=(const double Secs);

    55 	const CPerfTimer& operator-=(const double Secs);

    56 

    57 	// Boolean comparison operators

    58 	BOOL operator<(const CPerfTimer& Src);

    59 	BOOL operator>(const CPerfTimer& Src);

    60 	BOOL operator<=(const CPerfTimer& Src);

    61 	BOOL operator>=(const CPerfTimer& Src);

    62 	// For time in seconds

    63 	BOOL operator<(const double Secs);

    64 	BOOL operator>(const double Secs);

    65 	BOOL operator<=(const double Secs);

    66 	BOOL operator>=(const double Secs);

    67 

    68 	virtual void Lock() const {;}     // Override for thread safe operation

    69 	virtual void Unlock() const {;}     // Override for thread safe operation

    70 protected:

    71 	void Init(BOOL bStart);

    72 	void Copy(const CPerfTimer& Src);

    73 

    74 private:

    75 	__int64 m_Start;

    76 	static __int64 m_Freq;   // does not change while system is running

    77 	static __int64 m_Adjust; // Adjustment time it takes to Start and Stop

    78 };

    79 

    80 class CPerfTimerT : public CPerfTimer

    81 { // You only need to use types of this class if a timer is going to be shared between threads

    82 public:

    83 	CPerfTimerT(BOOL bStart = FALSE)

    84 	{

    85 		m_hMutex = CreateMutex(NULL,FALSE,"");

    86 		Init(bStart);

    87 	}

    88 

    89 	CPerfTimerT(const CPerfTimerT& Src) 

    90 	{ 

    91 		m_hMutex = CreateMutex(NULL,FALSE,"");

    92 		Copy(Src); 

    93 	}

    94 

    95 	CPerfTimerT(const CPerfTimer& Src) 

    96 	{ 

    97 		m_hMutex = CreateMutex(NULL,FALSE,"");

    98 		Copy(Src); 

    99 	}

   100 

   101 	virtual ~CPerfTimerT() 

   102 	{ CloseHandle(m_hMutex); }

   103 

   104 	const CPerfTimerT& operator=(const CPerfTimerT& Src) // Assignment operator 

   105 	{

   106 		Copy(Src);

   107 		return *this; 

   108 	}

   109 

   110 	virtual void Lock() const { WaitForSingleObject(m_hMutex,10000); }   

   111 	virtual void Unlock() const { ReleaseMutex(m_hMutex); }   

   112 private:

   113 	HANDLE m_hMutex;

   114 };

   115 

   116 inline void CPerfTimer::Init(BOOL bStart)

   117 {

   118 	if (!m_Freq) 

   119 	{ // Initialization should only run once

   120 		QueryPerformanceFrequency((LARGE_INTEGER *)&m_Freq); 

   121 		if (!m_Freq)

   122 			m_Freq = 1; // Timer will be useless but will not cause divide by zero

   123 		m_Start = 0; 

   124 		m_Adjust = 0; 

   125 		Start();            // Time a Stop

   126 		Stop(); 

   127 		m_Adjust = m_Start;

   128 	}

   129 	// This is the only part that normally runs

   130 	m_Start = 0; 

   131 	if (bStart)

   132 		Start(); 

   133 }

   134 

   135 inline CPerfTimer::CPerfTimer(const CPerfTimer& Src)  

   136 {

   137 	Copy(Src);

   138 }

   139 

   140 inline void CPerfTimer::Copy(const CPerfTimer& Src)

   141 {

   142 	if (&Src == this) 

   143 		return; // avoid deadlock if someone tries to copy it to itself

   144 	Src.Lock();

   145 	Lock();

   146 	m_Start = Src.m_Start; 

   147 	Unlock();

   148 	Src.Unlock();

   149 }

   150 

   151 inline void CPerfTimer::Start(BOOL bReset) 

   152 { // Start from current value or optionally from 0

   153 	__int64 i;

   154 	QueryPerformanceCounter((LARGE_INTEGER *)&i);

   155 	Lock();

   156 	if ((!bReset) && (m_Start < 0))

   157 		m_Start += i;   // We are starting with an accumulated time

   158 	else 

   159 		m_Start = i;    // Starting from 0

   160 	Unlock();

   161 } 

   162 

   163 inline void CPerfTimer::Stop() 

   164 { // Stop timing. Use Start afterwards to continue

   165 	Lock();

   166 	if (m_Start <= 0)

   167 	{

   168 		Unlock();

   169 		return;          // Was not running

   170 	}

   171 	__int64 i;

   172 	QueryPerformanceCounter((LARGE_INTEGER *)&i); 

   173 	m_Start += -i;          // Stopped timer keeps elapsed timer ticks as a negative 

   174 	if (m_Start < m_Adjust) // Do not overflow

   175 		m_Start -= m_Adjust;  // Adjust for time timer code takes to run

   176 	else 

   177 		m_Start = 0;          // Stop must have been called directly after Start

   178 	Unlock();

   179 } 

   180 

   181 inline BOOL CPerfTimer::IsRunning() 

   182 { // Returns FALSE if stopped.

   183 	Lock();

   184 	BOOL bRet = (m_Start > 0); // When < 0, holds elpased clicks

   185 	Unlock();

   186 	return bRet;   

   187 }

   188 inline const double CPerfTimer::Elapsed()

   189 { // Returns elapsed time in seconds

   190 	CPerfTimer Result(*this);

   191 	Result.Stop();

   192 	return (double)(-Result.m_Start)/(double)m_Freq; 

   193 }

   194 

   195 inline const double CPerfTimer::Elapsedms() 

   196 { // Returns elapsed time in milliseconds

   197 	CPerfTimer Result(*this);

   198 	Result.Stop();

   199 	return (-Result.m_Start*1000.0)/(double)m_Freq; 

   200 }

   201 

   202 inline const double CPerfTimer::Elapsedus() 

   203 { // Returns elapsed time in microseconds

   204 	CPerfTimer Result(*this);

   205 

   206 	return (-Result.m_Start * 1000000.0)/(double)m_Freq; 

   207 }

   208 

   209 

   210 // Assignment operator

   211 inline const CPerfTimer& CPerfTimer::operator=(const CPerfTimer& Src) 

   212 {

   213 	Copy(Src);

   214 	return *this; 

   215 }

   216 

   217 

   218 // Math operators

   219 inline CPerfTimer CPerfTimer::operator+(const CPerfTimer& Src) const

   220 {

   221 	CPerfTimer Result(*this);

   222 	Result += Src; 

   223 	return Result; 

   224 }

   225 

   226 inline CPerfTimer CPerfTimer::operator-(const CPerfTimer& Src) const

   227 {

   228 	CPerfTimer Result(*this);

   229 	Result -= Src; 

   230 	return Result; 

   231 }

   232 

   233 inline const CPerfTimer& CPerfTimer::operator+=(const CPerfTimer& Src)

   234 {

   235 	CPerfTimer SrcStop(Src);  // Temp is necessary in case Src is not stopped

   236 	SrcStop.Stop();

   237 	Lock();

   238 	m_Start += SrcStop.m_Start;

   239 	Unlock();

   240 	return *this; 

   241 }

   242 

   243 inline const CPerfTimer& CPerfTimer::operator-=(const CPerfTimer& Src)

   244 {

   245 	CPerfTimer SrcStop(Src);  // Temp is necessary in case Src is not stopped

   246 	SrcStop.Stop();

   247 	Lock();

   248 	m_Start -= SrcStop.m_Start; 

   249 	Unlock();

   250 	return *this; 

   251 }

   252 

   253 // For time in seconds

   254 inline CPerfTimer CPerfTimer::operator+(const double Secs) const

   255 {

   256 	CPerfTimer Result(*this);

   257 	Result += Secs; 

   258 	return Result; 

   259 }

   260 

   261 inline CPerfTimer CPerfTimer::operator-(const double Secs) const

   262 {

   263 	CPerfTimer Result(*this);

   264 	Result += Secs; 

   265 	return Result; 

   266 }

   267 

   268 inline const CPerfTimer& CPerfTimer::operator+=(const double Secs)

   269 {

   270 	Lock();

   271 	m_Start -= (__int64)(Secs*(double)m_Freq);

   272 	Unlock();

   273 	return *this; 

   274 }

   275 

   276 inline const CPerfTimer& CPerfTimer::operator-=(const double Secs)

   277 {

   278 	Lock();

   279 	m_Start += (__int64)(Secs*(double)m_Freq);

   280 	Unlock();

   281 	return *this; 

   282 }

   283 

   284 

   285 

   286 // Boolean comparison operators

   287 inline BOOL CPerfTimer::operator<(const CPerfTimer& Src)

   288 { 

   289 	BOOL bRet; 

   290 	CPerfTimer Temp(Src);

   291 	Lock();

   292 	if (m_Start <= 0)

   293 	{

   294 		Temp.Stop();

   295 		bRet = (m_Start > Temp.m_Start); 

   296 		Unlock();

   297 		return bRet;

   298 	}

   299 	else

   300 		if (Temp.m_Start > 0)

   301 		{

   302 			bRet = (m_Start < Temp.m_Start); 

   303 			Unlock();

   304 			return bRet;

   305 		}

   306 		else

   307 		{

   308 			Unlock();

   309 			CPerfTimer ThisStop(*this);

   310 			ThisStop.Stop();

   311 			return (ThisStop.m_Start > Temp.m_Start); 

   312 		}

   313 }

   314 

   315 inline BOOL CPerfTimer::operator>(const CPerfTimer& Src)

   316 { 

   317 	BOOL bRet; 

   318 	CPerfTimer Temp(Src);

   319 	Lock();

   320 	if (m_Start <= 0)

   321 	{

   322 		Temp.Stop();

   323 		bRet = (m_Start < Temp.m_Start); 

   324 		Unlock();

   325 		return bRet;

   326 	}

   327 	else

   328 		if (Temp.m_Start > 0)

   329 		{

   330 			bRet = (m_Start > Temp.m_Start); 

   331 			Unlock();

   332 			return bRet;

   333 		}

   334 		else

   335 		{

   336 			Unlock();

   337 			CPerfTimer ThisStop(*this);

   338 			ThisStop.Stop();

   339 			return (ThisStop.m_Start < Temp.m_Start); 

   340 		}

   341 }

   342 

   343 inline BOOL CPerfTimer::operator<=(const CPerfTimer& Src)

   344 { 

   345 	return !(*this > Src);

   346 }

   347 

   348 inline BOOL CPerfTimer::operator>=(const CPerfTimer& Src)

   349 { 

   350 	return !(*this < Src);

   351 }

   352 

   353 // For time in seconds

   354 inline BOOL CPerfTimer::operator<(const double Secs)

   355 { 

   356 	BOOL bRet; 

   357 	Lock();

   358 	if (m_Start <= 0)

   359 	{

   360 		bRet = (m_Start > (__int64)(-Secs*(double)m_Freq)); 

   361 		Unlock();

   362 		return bRet;

   363 	}

   364 	else

   365 	{

   366 		Unlock();

   367 		CPerfTimer ThisStop(*this);

   368 		ThisStop.Stop();

   369 		return (ThisStop.m_Start > (__int64)(-Secs*(double)m_Freq)); 

   370 	}

   371 }

   372 

   373 inline BOOL CPerfTimer::operator>(const double Secs)

   374 { 

   375 	BOOL bRet; 

   376 	Lock();

   377 	if (m_Start <= 0)

   378 	{

   379 		bRet = (m_Start < (__int64)(-Secs*(double)m_Freq)); 

   380 		Unlock();

   381 		return bRet;

   382 	}

   383 	else

   384 	{

   385 		Unlock();

   386 		CPerfTimer ThisStop(*this);

   387 		ThisStop.Stop();

   388 		return (ThisStop.m_Start < (__int64)(-Secs*(double)m_Freq)); 

   389 	}

   390 }

   391 

   392 inline BOOL CPerfTimer::operator<=(const double Secs)

   393 { 

   394 	return !(*this > Secs);

   395 }

   396 

   397 inline BOOL CPerfTimer::operator>=(const double Secs)

   398 { 

   399 	return !(*this < Secs);

   400 }

   401 

   402 

   403 #endif //__PERFTIMER_H__
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:31:27 -0600
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