#if defined(_WIN32)

#include <Windows.h>

#elif defined(__MACH__)

#include <time.h>

#include <mach/clock.h>

#include <mach/mach.h>

#else

#include <time.h>

#endif

#include "Core/Utils.h"

double get_time_milliseconds()

{

#if defined(_WIN32)

static double freq = 0.0;

if (freq == 0.0) {

LARGE_INTEGER li;

if (!QueryPerformanceFrequency(&li))

die("clock failure");

freq = (double)li.QuadPart / 1000.0;

}

LARGE_INTEGER li;

QueryPerformanceCounter(&li);

return (double)li.QuadPart / freq;

#elif defined(__MACH__)

struct timespec t;

clock_serv_t cclock;

mach_timespec_t mts;

host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);

if (clock_get_time(cclock, &mts) != KERN_SUCCESS) {

die("clock failure");

}

mach_port_deallocate(mach_task_self(), cclock);

t.tv_sec = mts.tv_sec;

t.tv_nsec = mts.tv_nsec;

return (double)t.tv_sec * 1000.0 + (double)t.tv_nsec / 1000000.0;

#else

struct timespec t;

if (clock_gettime(CLOCK_MONOTONIC, &t) != 0)

die("clock failure");

return (double)t.tv_sec * 1000.0 + (double)t.tv_nsec / 1000000.0;

#endif

}