timer.c

#include <kiba/platform/timer.h>
 
// TODO this is scuffed and should be rethought
#define __USE_POSIX199309
#include <time.h>
 
timestamp time_now(void) {
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
    return (timestamp){
        .s  = ts.tv_sec,
        .ns = ts.tv_nsec,
    };
}
 
static inline struct timespec time_diff_internal(timestamp start, timestamp end) {
    struct timespec diff;
    if ((end.ns - start.ns) < 0) {
        diff.tv_sec  = end.s - start.s - 1;
        diff.tv_nsec = 1000000000 + end.ns - start.ns;
    } else {
        diff.tv_sec  = end.s - start.s;
        diff.tv_nsec = end.ns - start.ns;
    }
    return diff;
}
 
f64 time_diff_s(timestamp start, timestamp end) {
    struct timespec diff = time_diff_internal(start, end);
    return (f64) diff.tv_sec + (f64) diff.tv_nsec * 0.000000001;
}
 
f64 time_diff_ms(timestamp start, timestamp end) {
    struct timespec diff = time_diff_internal(start, end);
    return (f64) diff.tv_sec * 1000.0 + (f64) diff.tv_nsec * 0.000001;
}