StopWatch.cpp

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/*
 * Copyright (c) 2012 SCHUNK GmbH & Co. KG
 * Copyright (c) 2017 Fraunhofer Institute for Manufacturing Engineering and Automation (IPA)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "StopWatch.h"

// ========================================================================== ;
//                                                                            ;
//                  private auxiliary functions          
//                                                                            ;
// ========================================================================== ;

// ========================================================================== ;
//                                                                            ;
//                  protected auxiliary functions
//                                                                            ;
// ========================================================================== ;

// ========================================================================= ;
//                                                                           ;
//                      constructors / destructor                            ;
//                                                                           ;
// ========================================================================= ;

CStopWatch::CStopWatch()
          : CMessage("CStopWatch", g_iDebugLevel, g_bDebug, g_bDebugFile),
                m_bStartFlag(false),
                m_bStopFlag(false),
                m_iTimeType(util_REAL_TIME)
{
                m_iFirst = 0;
                m_iLast = 0;
                m_fOverflowTime = 0.0;
                
#if defined(_WIN32)
                QueryPerformanceFrequency(&m_TempTime);   // pointer to current frequency
                frequencyE = m_TempTime.LowPart;
                m_FirstTime.HighPart = 0;
                m_FirstTime.LowPart = 0;
                m_LastTime.HighPart = 0;
                m_LastTime.LowPart = 0;
                m_TempTime.HighPart = 0;
                m_TempTime.LowPart = 0;
                m_ActualTime.HighPart = 0;
                m_ActualTime.LowPart = 0;
#elif defined(__QNX__)
                m_FirstTime.tv_sec = 0;
                m_FirstTime.tv_nsec = 0;
                m_LastTime.tv_sec = 0;
                m_LastTime.tv_nsec = 0;
                m_TempTime.tv_sec = 0;
                m_TempTime.tv_nsec = 500000;
                clock_setres(CLOCK_REALTIME, &m_TempTime);
                m_ActualTime.tv_sec = 0;
                m_ActualTime.tv_nsec = 0;
#else
                m_FirstTime.tv_sec = 0;
                m_FirstTime.tv_usec = 0;
                m_LastTime.tv_sec = 0;
                m_LastTime.tv_usec = 0;
                m_TempTime.tv_sec = 0;
                m_TempTime.tv_usec = 0;
                m_ActualTime.tv_sec = 0;
                m_ActualTime.tv_usec = 0;
#endif
}

CStopWatch::CStopWatch(util_TimeMeasurementType iTimeType)
          : CMessage("CStopWatch", g_iDebugLevel, g_bDebug, g_bDebugFile),
                m_bStartFlag(false),
                m_bStopFlag(false),
                m_iTimeType(iTimeType)
{
                m_iFirst = 0;
                m_iLast = 0;
                m_fOverflowTime = 0.0;
                
#if defined(_WIN32)
                QueryPerformanceFrequency(&m_TempTime);   // pointer to current frequency
                frequencyE = m_TempTime.LowPart;
                m_FirstTime.HighPart = 0;
                m_FirstTime.LowPart = 0;
                m_LastTime.HighPart = 0;
                m_LastTime.LowPart = 0;
                m_TempTime.HighPart = 0;
                m_TempTime.LowPart = 0;
                m_ActualTime.HighPart = 0;
                m_ActualTime.LowPart = 0;
#elif defined(__QNX__)
                m_FirstTime.tv_sec = 0;
                m_FirstTime.tv_nsec = 0;
                m_LastTime.tv_sec = 0;
                m_LastTime.tv_nsec = 0;
                m_TempTime.tv_sec = 0;
                m_TempTime.tv_nsec = 500000;
                clock_setres(CLOCK_REALTIME, &m_TempTime);
                m_ActualTime.tv_sec = 0;
                m_ActualTime.tv_nsec = 0;
#else
                m_FirstTime.tv_sec = 0;
                m_FirstTime.tv_usec = 0;
                m_LastTime.tv_sec = 0;
                m_LastTime.tv_usec = 0;
                m_TempTime.tv_sec = 0;
                m_TempTime.tv_usec = 0;
                m_ActualTime.tv_sec = 0;
                m_ActualTime.tv_usec = 0;
#endif
}

CStopWatch::CStopWatch(const CStopWatch& )
{
        error(-1, "copy constructor : method should not be called!");
}

// ========================================================================= ;
//                                                                           ;
//                  operators
//                                                                           ;
// ========================================================================= ;

CStopWatch& CStopWatch::operator=(const CStopWatch&)
{
        error(-1, "assignment operator : method should not be called!");
        return *this;
}

// ========================================================================= ;
//                                                                           ;
//                  query functions
//                                                                           ;
// ========================================================================= ;

// ========================================================================= ;
//                                                                           ;
//                  modifiy functions
//                                                                           ;
// ========================================================================= ;

// ========================================================================= ;
//                                                                           ;
//                  I/O
//                                                                           ;
// ========================================================================= ;

/*
        This member function computes the difference between the taken start and stop times, if both are valid.
        Attention: cpu-time is calculated in a wrong way, if process lasts longer than 35 min or 2 processes
                    are stoped with the second beginning more than half an hour after the first one was started.
                   Look for function testOverflow in any of these cases.
         difference or $0.0$ if call was invalid
*/
double CStopWatch::executionTime()
{
        // --- check
        if ( !(m_bStartFlag && m_bStopFlag) )
        {
                warning("executionTime() : return 0.0, for you must call 'start()' and 'stop()' first");
                return 0.0;
        };

        if(m_iTimeType == util_CPU_TIME)
        {
                if ((m_iLast < m_iFirst) && (m_fOverflowTime == 0))
                {
                        warning("executionTime() : return 0.0, for start time is bigger than stop time and no overflow was detected");
                        return 0.0;
                }
                else
                {
                        double fTempTime;
                        testOverflow();
                        fTempTime = m_fOverflowTime;
                        m_fOverflowTime = 0.0;
                        return fTempTime + (double(m_iLast - m_iFirst)) / CLOCKS_PER_SEC;
                };
        }
        else
        {
                #if defined(__QNX__)
                return (m_LastTime.tv_sec-m_FirstTime.tv_sec
                  +(double(m_LastTime.tv_nsec-m_FirstTime.tv_nsec)/1e+9));
                #elif defined(_WIN32)
                return double(m_LastTime.LowPart-m_FirstTime.LowPart)/frequencyE;
                #else
                return (m_LastTime.tv_sec-m_FirstTime.tv_sec
                  +(double(m_LastTime.tv_usec-m_FirstTime.tv_usec)/1e+6));
                #endif   
        };
};

// ========================================================================= ;
//                                                                           ;
//                  exec functions
//                                                                           ;
// ========================================================================= ;

void  CStopWatch::start() 
{
        if(m_iTimeType == util_CPU_TIME)
        {
                m_iFirst=clock();
                m_bStartFlag = true;
                m_bStopFlag = false;
        }
        else
        {
#if defined(__QNX__)
                clock_gettime(CLOCK_REALTIME,&m_FirstTime);
#elif defined(_WIN32)
                QueryPerformanceCounter(&m_FirstTime);
#else
                gettimeofday(&m_FirstTime,0);
#endif
                m_bStartFlag = true;
                m_bStopFlag = false;
        };
};

/*
        This member function sets the stop time of the watch to the current clock value, if a valid start time exists.
*/
void CStopWatch::stop()
{
        if (m_bStartFlag)
        {
                if(m_iTimeType == util_CPU_TIME)
                {
                        m_iLast = clock();
                }
                else
                {
                        #if defined(__QNX__)
                        clock_gettime(CLOCK_REALTIME,&m_LastTime);
                        #elif defined(_WIN32)
                        QueryPerformanceCounter(&m_LastTime);
                        #else
                        gettimeofday(&m_LastTime,0);
                        #endif
                };
                m_bStopFlag = true;
        }
        else
        {
                m_bStopFlag = false;
                warning("stop() : you must call 'start()' first");
        };
};

// -------------------------------------------------------------------------- ;

/*
        This member function continues the run of the clock after is has been stopped.
*/
void CStopWatch::cont()
{
        if (m_bStartFlag && m_bStopFlag)
        {
                if(m_iTimeType == util_CPU_TIME)
                {  
                        m_iFirst      = m_iFirst + (clock() - m_iLast);
                        m_bStopFlag  = false;
                }
                else
                {
                        #if defined(__QNX__)
                        clock_gettime(CLOCK_REALTIME,&m_TempTime);
                        m_FirstTime.tv_sec +=  m_TempTime.tv_sec-m_LastTime.tv_sec;
                        m_FirstTime.tv_nsec +=  m_TempTime.tv_nsec-m_LastTime.tv_nsec;
                        #elif defined(_WIN32)
                        QueryPerformanceCounter(&m_TempTime);
                        m_FirstTime.HighPart +=  m_TempTime.HighPart-m_LastTime.HighPart;
                        m_FirstTime.LowPart +=  m_TempTime.LowPart-m_LastTime.LowPart;
                        #else
                        gettimeofday(&m_TempTime,0);
                        m_FirstTime.tv_sec +=  m_TempTime.tv_sec-m_LastTime.tv_sec;
                        m_FirstTime.tv_usec +=  m_TempTime.tv_usec-m_LastTime.tv_usec;
                        #endif
                };
        }
        else
                warning("cont() : you must call 'start()' and 'stop()' first");
};

// This member function returns the current real time in [s].
double CStopWatch::realTime() 
{
        #if defined(__QNX__)
        clock_gettime(CLOCK_REALTIME,&m_ActualTime);
        return (m_ActualTime.tv_sec+(double(m_ActualTime.tv_nsec)/1e+9));
        #elif defined(_WIN32)
        QueryPerformanceCounter(&m_ActualTime);
        return (double(m_ActualTime.LowPart)/frequencyE);
        #else
        gettimeofday(&m_ActualTime,0);
        return (m_ActualTime.tv_sec
          +(double(m_ActualTime.tv_usec)/1e+6));
        #endif
};

// This member function returns the real time resolution in [s].
double CStopWatch::realTimeResolution() 
{
        #if defined(__QNX__)
        clock_getres(CLOCK_REALTIME,&m_TempTime);
        return (m_TempTime.tv_sec+(double(m_TempTime.tv_nsec)/1e+9));
        #elif defined(_WIN32)
        warning("unkown real time resolution\n");
        return 0.001;
        #else
        warning("unkown real time resolution\n");
        return 0.001;
        #endif
};

/*
        This member function waits the given realtime in [ms].
        uiTime: realtime in [ms]
*/
void CStopWatch::wait(unsigned int uiTime)
{
        bool bTimeOutFlag = false;
#if defined(__QNX__)
        unsigned int uiSec, uiNSec;
        uiSec = uiTime / 1000;
        uiNSec = (uiTime % 1000) * 1000000;
        clock_gettime(CLOCK_REALTIME, &m_TempTime);
        m_TempTime.tv_sec = m_TempTime.tv_sec + uiSec + (m_TempTime.tv_nsec + uiNSec) / 1000000000;
        m_TempTime.tv_nsec = (m_FirstTime.tv_nsec + uiNSec) % 1000000000;
        do
        {
                clock_gettime(CLOCK_REALTIME, &m_ActualTime);
                if(m_ActualTime.tv_sec > m_TempTime.tv_sec)
                        bTimeOutFlag = true;
                else if((m_ActualTime.tv_sec == m_TempTime.tv_sec) && (m_ActualTime.tv_nsec > m_TempTime.tv_nsec))
                        bTimeOutFlag = true;
        }
        while(!bTimeOutFlag);
#elif defined(_WIN32)
        Sleep(uiTime);
#else
        unsigned int uiSec, uiUSec;
        uiSec = uiTime / 1000;
        uiUSec = (uiTime % 1000) * 1000;
        gettimeofday(&m_TempTime, 0);
        m_TempTime.tv_sec = m_TempTime.tv_sec + uiSec + (m_TempTime.tv_usec + uiUSec) / 1000000;
        m_TempTime.tv_usec = (m_TempTime.tv_usec + uiUSec) % 1000000;
        do
        {
                gettimeofday(&m_ActualTime, 0);
                if(m_ActualTime.tv_sec > m_TempTime.tv_sec)
                        bTimeOutFlag = true;
                else if((m_ActualTime.tv_sec == m_TempTime.tv_sec) && (m_ActualTime.tv_usec > m_TempTime.tv_usec))
                        bTimeOutFlag = true;
        }
        while(!bTimeOutFlag);
#endif
};

// -------------------------------------------------------------------------- ;

/*
        This member function returns the current date and time in local representation
        char* to hold the local date and time
*/
void CStopWatch::date(char* acDate)  const
{
        time_t currentTime;
        struct tm *localTime;

        // get the current time
        currentTime = time (NULL);

        // convert it to local time representation
        localTime = localtime (&currentTime);

        // print it out in a buffer
        strftime (acDate, 256, "%a %b %d %I:%M:%S %p %Z %Y", localTime);
};

// -------------------------------------------------------------------------- ;

/*
        This member function returns the current weekday in local representation
        string to hold the local weekday
*/
void CStopWatch::weekday(char* acWeekDay)  const
{
        time_t currentTime;
        struct tm *localTime;

        // get the current time
        currentTime = time (NULL);

        // convert it to local time representation
        localTime = localtime (&currentTime);

        // print it out in a buffer
        strftime (acWeekDay, 256, "%A", localTime);
};

// ========================================================================= ;

/*
        This function tests, if there is an overflow at the clock counter
        Function should be called at least every 30 min., if the cpu_time is stoped
        Otherwise there might be more than one overflow and results are wrong!
*/
void CStopWatch::testOverflow()
{
        if(m_iTimeType == util_CPU_TIME)
        {
                stop();
                if (m_iLast < m_iFirst)
                {
                        m_fOverflowTime += (double(m_iLast - m_iFirst + ULONG_MAX)) / CLOCKS_PER_SEC;
                        start();
                }
                else
                        cont();
        }
        else
                warning("testOverflow() : overflow has to be tested only when measuring cpu-time");
};

// ========================================================================= ;