Created
May 22, 2016 16:05
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#include <time.h> | |
#include <sys/time.h> | |
#ifdef __MACH__ | |
#include <mach/clock.h> | |
#include <mach/mach.h> | |
#define CLOCK_REALTIME 0 | |
#define CLOCK_MONOTONIC 0 | |
static int | |
clock_gettime(int clk_id, struct timespec *ts) { | |
clock_serv_t cclock; | |
mach_timespec_t mts; | |
host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock); | |
clock_get_time(cclock, &mts); | |
mach_port_deallocate(mach_task_self(), cclock); | |
ts->tv_sec = mts.tv_sec; | |
ts->tv_nsec = mts.tv_nsec; | |
return 0; | |
} | |
#endif | |
void timespec_diff(struct timespec *start, struct timespec *stop, | |
struct timespec *result) | |
{ | |
if ((stop->tv_nsec - start->tv_nsec) < 0) { | |
result->tv_sec = stop->tv_sec - start->tv_sec - 1; | |
result->tv_nsec = stop->tv_nsec - start->tv_nsec + 1000000000; | |
} else { | |
result->tv_sec = stop->tv_sec - start->tv_sec; | |
result->tv_nsec = stop->tv_nsec - start->tv_nsec; | |
} | |
} | |
timespec ts1, ts2; | |
clock_gettime(CLOCK_REALTIME, &ts1); | |
// do something | |
clock_gettime(CLOCK_REALTIME, &ts2); | |
timespec diff; | |
timespec_diff(&ts1, &ts2, &diff); | |
printf("%lld.%.9ld\n", diff.tv_nsec - diff.tv_nsec); |
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