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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.
*/
#undef NDEBUG
#include "timer.hpp"
#include <cassert>
#include <cmath>
#include <QDebug>
Timer::Timer()
{
start();
}
void Timer::start()
{
gettime(&state);
}
struct timespec Timer::get_delta() const
{
struct timespec ts; // NOLINT
gettime(&ts);
return { ts.tv_sec - state.tv_sec, ts.tv_nsec - state.tv_nsec };
}
// milliseconds
double Timer::elapsed_ms() const
{
struct timespec delta = get_delta();
return delta.tv_sec * 1000 + delta.tv_nsec * 1e-6;
}
double Timer::elapsed_seconds() const
{
struct timespec delta = get_delta();
return delta.tv_sec + delta.tv_nsec * 1e-9;
}
// --
// platform-specific code starts here
// --
#if defined (_WIN32)
# include <windows.h>
static auto otr_get_clock_frequency()
{
LARGE_INTEGER freq{};
BOOL ret = QueryPerformanceFrequency(&freq);
assert(ret && "QueryPerformanceFrequency failed");
return freq.QuadPart;
}
void Timer::gettime(timespec* state)
{
static const auto freq = otr_get_clock_frequency();
LARGE_INTEGER d;
BOOL ret = QueryPerformanceCounter(&d);
assert(ret && "QueryPerformanceCounter failed");
constexpr int nsec = 1'000'000'000;
state->tv_sec = (time_t)(d.QuadPart/freq);
state->tv_nsec = (decltype(state->tv_nsec))(d.QuadPart % freq * nsec / freq);
}
#elif defined __MACH__
# include <inttypes.h>
# include <mach/mach_time.h>
static mach_timebase_info_data_t otr_get_mach_frequency()
{
mach_timebase_info_data_t timebase_info;
kern_return_t status = mach_timebase_info(&timebase_info);
assert(status == KERN_SUCCESS && "mach_timebase_info failed");
return timebase_info;
}
void Timer::gettime(timespec* ts)
{
static const 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 / 1000000000UL;
ts->tv_nsec = nsec % 1000000000UL;
}
#else
void Timer::gettime(timespec* ts)
{
int error = clock_gettime(CLOCK_MONOTONIC, ts);
assert(error == 0 && "clock_gettime failed");
}
#endif
// common
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