1/*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7#include "SysTimer_posix.h"
8
9static double interval_in_ms(timespec start_clock, timespec end_clock)
10{
11    double duration_clock;
12    if ((end_clock.tv_nsec - start_clock.tv_nsec) < 0) {
13        duration_clock = (end_clock.tv_sec - start_clock.tv_sec - 1) * 1000;
14        duration_clock += (1000000000 + end_clock.tv_nsec - start_clock.tv_nsec) / 1000000.0;
15    } else {
16        duration_clock = (end_clock.tv_sec - start_clock.tv_sec) * 1000;
17        duration_clock += (end_clock.tv_nsec - start_clock.tv_nsec) / 1000000.0;
18    }
19    return duration_clock;
20}
21
22void SysTimer::startWall() {
23    if (-1 == clock_gettime(CLOCK_MONOTONIC, &fWall)) {
24        timespec none = {0, 0};
25        fWall = none;
26    }
27}
28void SysTimer::startCpu() {
29    if (-1 == clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &fCpu)) {
30        timespec none = {0, 0};
31        fCpu = none;
32    }
33}
34
35double SysTimer::endCpu() {
36    timespec end_cpu;
37    if (-1 == clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &end_cpu)) {
38        timespec none = {0, 0};
39        end_cpu = none;
40    }
41    return interval_in_ms(fCpu, end_cpu);
42}
43
44double SysTimer::endWall() {
45    timespec end_wall;
46    if (-1 == clock_gettime(CLOCK_MONOTONIC, &end_wall)) {
47        timespec none = {0, 0};
48        end_wall = none;
49    }
50    return interval_in_ms(fWall, end_wall);
51}
52