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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>
#elif defined(__MACH__)
# include <inttypes.h>
# include <mach/mach_time.h>
#endif
class Timer
{
private:
struct timespec state;
long long conv_nsecs(const struct timespec& cur) const
{
return (cur.tv_sec - state.tv_sec) * 1000000000LL + (cur.tv_nsec - state.tv_nsec);
}
long conv_usecs(const struct timespec& cur) const
{
return (cur.tv_sec - state.tv_sec) * 1000000LL + (cur.tv_nsec - state.tv_nsec) / 1000;
}
#ifdef _WIN32
static LARGE_INTEGER otr_get_clock_frequency()
{
LARGE_INTEGER freq = {};
(void) QueryPerformanceFrequency(&freq);
return freq;
}
static void otr_clock_gettime(struct timespec* ts)
{
static LARGE_INTEGER freq = otr_get_clock_frequency();
LARGE_INTEGER d;
(void) QueryPerformanceCounter(&d);
using ll = long long;
using ld = long double;
const long long part = ll(d.QuadPart / ld(freq.QuadPart) * 1000000000.L);
using t_s = decltype(ts->tv_sec);
using t_ns = decltype(ts->tv_nsec);
ts->tv_sec = t_s(part / 1000000000LL);
ts->tv_nsec = t_ns(part % 1000000000LL);
}
#elif defined(__MACH__)
static mach_timebase_info_data_t otr_get_mach_frequency()
{
mach_timebase_info_data_t timebase_info;
(void) mach_timebase_info(&timebase_info);
return timebase_info;
}
static void otr_clock_gettime(struct timespec* ts)
{
static mach_timebase_info_data_t timebase_info = otr_get_mach_frequency();
uint64_t state, nsec;
state = mach_absolute_time();
nsec = state * timebase_info.numer / timebase_info.denom;
ts->tv_sec = nsec / 1000000000L;
ts->tv_nsec = nsec % 1000000000L;
}
#endif
public:
Timer()
{
start();
}
static inline void wrap_gettime(struct timespec* state)
{
#if defined(_WIN32) || defined(__MACH__)
otr_clock_gettime(state);
#else
(void) clock_gettime(CLOCK_MONOTONIC, state);
#endif
}
void start()
{
wrap_gettime(&state);
}
long long elapsed_nsecs() const
{
struct timespec cur = {};
wrap_gettime(&cur);
return conv_nsecs(cur);
}
long elapsed_usecs() const
{
struct timespec cur = {};
wrap_gettime(&cur);
return long(conv_usecs(cur));
}
long elapsed_ms() const
{
return elapsed_usecs() / 1000L;
}
double elapsed_seconds() const
{
return double(elapsed_nsecs() * 1e-9L);
}
};
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