chundoong-lab-ta/SHPC2022/hw4/riemannsum/util.c

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2022-11-07 14:15:49 +09:00
#include "util.h"
#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
static double start_time[8];
void timer_init() { srand(time(NULL)); }
static double get_time() {
struct timespec tv;
clock_gettime(CLOCK_MONOTONIC, &tv);
return tv.tv_sec + tv.tv_nsec * 1e-9;
}
void timer_start(int i) { start_time[i] = get_time(); }
double timer_stop(int i) { return get_time() - start_time[i]; }
// Assume f is a black-box operation
double f(double x) { return 4.0 / (1.0 + x * x); }