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#pragma once
#include <time.h>
#if defined (_WIN32)
# include <windows.h>
# define CLOCK_MONOTONIC 0
static inline void clock_gettime(int, struct timespec* ts)
{
static LARGE_INTEGER freq;
if (!freq.QuadPart)
(void) QueryPerformanceFrequency(&freq);
LARGE_INTEGER d;
(void) QueryPerformanceCounter(&d);
d.QuadPart *= 1000000000L;
d.QuadPart /= freq.QuadPart;
ts->tv_sec = d.QuadPart / 1000000000L;
ts->tv_nsec = d.QuadPart % 1000000000L;
}
#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;
int conv(const struct timespec& cur)
{
return (cur.tv_sec - state.tv_sec) * 1000L + (cur.tv_nsec - state.tv_nsec) / 1000000L;
}
public:
Timer() {
start();
}
int start() {
struct timespec cur;
(void) clock_gettime(CLOCK_MONOTONIC, &cur);
int ret = conv(cur);
state = cur;
return ret;
}
int elapsed() {
struct timespec cur;
(void) clock_gettime(CLOCK_MONOTONIC, &cur);
return conv(cur);
}
};
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