epicminic/timer.c at master · markusmo/epicminic · GitHub

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#include <stdio.h>
#include <sys/time.h>

struct timeval lt; /* save previous time when lap_timer() called */
static int first = 1;

void set_timer() {
	if (first) {
		gettimeofday(&lt, NULL);
		first = 0;
	}
}

void reset_timer() {
	gettimeofday(&lt, NULL);
}

double lap_timer() {
	struct timeval tt;
	double lap_time;
	gettimeofday(&tt, NULL);
	lap_time = (double)(tt.tv_sec - lt.tv_sec) + (double)(tt.tv_usec - lt.tv_usec)/1000000.0;
	lt = tt;
	return lap_time;
}

double get_timer() {
	struct timeval tt;
	double lap_time;

	if (first) {
		set_timer();
		return 0.0;
	}

	gettimeofday(&tt, NULL);
	lap_time = (double)(tt.tv_sec - lt.tv_sec) + (double)(tt.tv_usec - lt.tv_usec)/1000000.0;
	return lap_time;
}