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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.
*/
#include <cassert>
#include "timer.hpp"
#include <cmath>
using time_type = Timer::time_type;
Timer::Timer()
{
start();
}
void Timer::start()
{
gettime(&state);
}
// nanoseconds
time_type Timer::elapsed_nsecs() const
{
timespec cur{};
gettime(&cur);
return conv_nsecs(cur);
}
time_type Timer::conv_nsecs(const struct timespec& cur) const
{
return (cur.tv_sec - state.tv_sec) * 1000000000LL + (cur.tv_nsec - state.tv_nsec);
}
// microseconds
double Timer::elapsed_usecs() const
{
timespec cur{};
gettime(&cur);
const long long nsecs = conv_nsecs(cur);
return nsecs * 1e-3;
}
// milliseconds
double Timer::elapsed_ms() const
{
return elapsed_usecs() / 1000.;
}
double Timer::elapsed_seconds() const
{
return double(elapsed_nsecs() * 1e-9);
}
// --
// platform-specific code starts here
// --
#if defined (_WIN32)
# include <windows.h>
static LARGE_INTEGER otr_get_clock_frequency()
{
LARGE_INTEGER freq{};
const BOOL ret = QueryPerformanceFrequency(&freq);
assert(ret && "QueryPerformanceFrequency failed");
return freq;
}
static void otr_clock_gettime(timespec* ts)
{
static const LARGE_INTEGER freq = otr_get_clock_frequency();
LARGE_INTEGER d;
(void) QueryPerformanceCounter(&d);
using ll = long long;
const auto part = ll(std::roundl((d.QuadPart * 1000000000.L) / ll(freq.QuadPart)));
using t_s = decltype(ts->tv_sec);
using t_ns = decltype(ts->tv_nsec);
ts->tv_sec = t_s(part / 1000000000);
ts->tv_nsec = t_ns(part % 1000000000);
}
#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;
(void) mach_timebase_info(&timebase_info);
return timebase_info;
}
static void otr_clock_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 / 1000000000L;
ts->tv_nsec = nsec % 1000000000L;
}
#endif
// common
void Timer::gettime(timespec* state)
{
#if defined(_WIN32) || defined(__MACH__)
otr_clock_gettime(state);
#elif defined CLOCK_MONOTONIC
const int res = clock_gettime(CLOCK_MONOTONIC, state);
assert(res == 0 && "must support CLOCK_MONOTONIC");
#else
# error "timer query method not known"
#endif
}
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