stopwatch.h

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#ifndef TBCI_STOPWATCH_H
#define TBCI_STOPWATCH_H

/* We need to know about certain settings, but we don't want to include basics.h */
#ifdef HAVE_TBCICONFIG_H
# include "tbci/tbciconfig.h"
#else
# include "tbci/config_manual.h"
#endif

//#define _ANSI_C_SOURCE 
#include <time.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if defined (__linux__) && !defined(CLK_TCK)
# define CLK_TCK ((clock_t) sysconf (_SC_CLK_TCK))
#endif

#ifdef HAVE_LIMITS_H
# include <limits.h>
#else
# ifndef LONG_MIN
#  if defined(__WORDSIZE) && __WORDSIZE == 64
#   define LONG_MIN (-9223372036854775807L - 1L)
#  else
#   define LONG_MIN (-2147483647L - 1L)
#  endif
# endif
#endif

/* Maybe we use a Linux kernel with changed HZ ... */
#if defined(__linux__) && defined(BROKEN_HZ) /* && defined(__i386__) */
# include <asm/param.h>
# define CPS (CLOCKS_PER_SEC*HZ/CLK_TCK)
#else
# define CPS CLOCKS_PER_SEC
#endif

class stopw_base 
{
 protected:
        double last_time;
        double total;
        const double secs_per_tick;
        const double overflow_secs;
        int running;

        virtual double seconds() const
        {
                return ((double) clock()) * secs_per_tick;
        }
        double adv_stopwatch()
        {
                const double secs = seconds();
                double diff = secs - last_time;
#ifdef __i386__ /* Extra precision is killing us on i386 */
                if (diff < 0.0 && -diff < secs_per_tick/4)
                        diff = 0.0;
#endif
                if (overflow_secs != 0.0 && diff < 0.0)
                        diff += overflow_secs;

                last_time = secs;
                total += diff;
                return diff;
        }

 public:
        stopw_base(const double tick, const double over = -1.0)
                : last_time(0.0)
                , total(0.0)
                , secs_per_tick (tick)
                , overflow_secs (over == -1.0 ? -tick * (2.0 * LONG_MIN): over)
                , running(0)
        {}
        virtual ~stopw_base() {}
        double reset()  
        { 
                const double t = total; 
                last_time = 0.0; 
                total = 0.0; running = 0; 
                return t; 
        }
        void start()  
        { 
                if (!running) { 
                        running = 1; last_time = seconds(); 
                } else
                        adv_stopwatch(); 
        }
        double stop()  
        { 
                if (running) { 
                        running = 0;
                        adv_stopwatch();
                }
                return total;
        }
        double stop_d()  
        {
                if (running) {
                        running = 0;
                        return adv_stopwatch();
                } else 
                        return 0.0;
        }
        double read() 
        {  
                if (running) 
                        adv_stopwatch();
                return total;
        }
        double read_d()
        {
                if (running)
                        return adv_stopwatch();
                else
                        return 0.0;
        }
};

class stopwatch : public stopw_base
{
 public:
        stopwatch() : stopw_base(1.0/CPS)  {}
};

#ifndef unix
typedef stopwatch stopwatch_u;
typedef stopwatch stopwatch_us;
#else
//#ifdef HAVE_SYS_TIMES_H
#include <sys/times.h>
//#endif
class stopwatch_u : public stopw_base
{
    protected:
        virtual double seconds() const
        {
                struct tms tims;
                /*if (*/times (&tims)/* < 0) STD__ cerr << "Error reading time!" << STD__ endl*/;
                return (double)(tims.tms_utime+tims.tms_cutime) * secs_per_tick;
        }

    public:
        stopwatch_u() : stopw_base(1000000.0 / (CPS * CLK_TCK))  {}
};

class stopwatch_us : public stopw_base
{
    protected:
        virtual double seconds() const
        {
                struct tms tims;
                /*if (*/times (&tims)/* < 0) STD__ cerr << "Error reading time!" << STD__ endl*/;
                return (double)(tims.tms_utime+tims.tms_cutime+tims.tms_stime+tims.tms_cstime) 
                        * secs_per_tick;
        }

    public:
        stopwatch_us() : stopw_base(1000000.0 / (CPS * CLK_TCK))  {}
};

#endif /* unix */

#ifdef unix
//#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
//#endif

//#ifdef HAVE_GETTIMEOFDAY
class stopwatch_e : public stopw_base
{
    protected:
        double seconds() const
        {
                struct timeval tv;
                gettimeofday(&tv, NULL);
                return (double)tv.tv_sec + (double)tv.tv_usec * 0.000001;
        }
        
    public:
        stopwatch_e() : stopw_base(0.000001, 0)  {}
};
//#endif /* HAVE_GETTIMEOFDAY */

#else /* unix */
# ifdef _MSC_VER

#include <sys/timeb.h>

class stopwatch_e : public stopw_base
{
    protected:
        double seconds() const
        {
                struct _timeb tb;
                _ftime(&tb);
                return (double)tb.time + (double)tb.millitm * 0.001;
        }
        
    public:
        stopwatch_e() : stopw_base(0.001)  {}
};

# else /* _MSC_VER */

class stopwatch_e : public stopw_base
{
    protected:
        double seconds() const
        {
                //time_t tm;
                return (double) time(0);
        }
        
    public:
        stopwatch_e() : stopw_base(1.0)  {}
};

# endif /* _MSC_VER */

#endif /* unix */

#endif /* TBCI_STOPWATCH_H */