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/* Copyright (c) 2014-2015, Stanislaw Halik <sthalik@misaki.pl>
* Permission to use, copy, modify, and/or distribute this
* software for any purpose with or without fee is hereby granted,
* provided that the above copyright notice and this permission
* notice appear in all copies.
*/
#pragma once
#include <ctime>
#if defined (_WIN32)
# include <windows.h>
# ifndef CLOCK_MONOTONIC
# define CLOCK_MONOTONIC -1
# endif
static inline void opentrack_clock_gettime(int, struct timespec* ts)
{
static LARGE_INTEGER freq;
if (!freq.QuadPart)
(void) QueryPerformanceFrequency(&freq);
LARGE_INTEGER d;
(void) QueryPerformanceCounter(&d);
long long part = d.QuadPart / ((long double)freq.QuadPart) * 1000000000.L;
ts->tv_sec = part / 1000000000ULL;
ts->tv_nsec = part % 1000000000ULL;
}
# define clock_gettime opentrack_clock_gettime
#else
# if defined(__MACH__)
# define CLOCK_MONOTONIC 0
# include <inttypes.h>
# include <mach/mach_time.h>
static inline void clock_gettime(int, struct timespec* ts)
{
static mach_timebase_info_data_t sTimebaseInfo;
uint64_t state, nsec;
if ( sTimebaseInfo.denom == 0 ) {
(void) mach_timebase_info(&sTimebaseInfo);
}
state = mach_absolute_time();
nsec = state * sTimebaseInfo.numer / sTimebaseInfo.denom;
ts->tv_sec = nsec / 1000000000L;
ts->tv_nsec = nsec % 1000000000L;
}
# endif
#endif
class Timer {
private:
struct timespec state;
long long conv(const struct timespec& cur) const
{
return (cur.tv_sec - state.tv_sec) * 1000000000LL + (cur.tv_nsec - state.tv_nsec);
}
public:
Timer() {
start();
}
void start() {
(void) clock_gettime(CLOCK_MONOTONIC, &state);
}
long long elapsed() const {
struct timespec cur;
(void) clock_gettime(CLOCK_MONOTONIC, &cur);
return conv(cur);
}
long elapsed_ms() const {
return elapsed() / 1000000L;
}
};
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