1/*
2 * Copyright (C) 2005 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "StopWatch"
18
19#include <string.h>
20#include <stdlib.h>
21#include <stdio.h>
22
23/* for PRId64 */
24#ifndef __STDC_FORMAT_MACROS
25#define __STDC_FORMAT_MACROS 1
26#endif
27#include <inttypes.h>
28
29#include <utils/Log.h>
30#include <utils/Errors.h>
31#include <utils/StopWatch.h>
32
33/*****************************************************************************/
34
35namespace android {
36
37
38StopWatch::StopWatch(const char *name, int clock, uint32_t flags)
39    :   mName(name), mClock(clock), mFlags(flags)
40{
41    reset();
42}
43
44StopWatch::~StopWatch()
45{
46    nsecs_t elapsed = elapsedTime();
47    const int n = mNumLaps;
48    ALOGD("StopWatch %s (us): %" PRId64 " ", mName, ns2us(elapsed));
49    for (int i=0 ; i<n ; i++) {
50        const nsecs_t soFar = mLaps[i].soFar;
51        const nsecs_t thisLap = mLaps[i].thisLap;
52        ALOGD(" [%d: %" PRId64 ", %" PRId64, i, ns2us(soFar), ns2us(thisLap));
53    }
54}
55
56const char* StopWatch::name() const
57{
58    return mName;
59}
60
61nsecs_t StopWatch::lap()
62{
63    nsecs_t elapsed = elapsedTime();
64    if (mNumLaps >= 8) {
65        elapsed = 0;
66    } else {
67        const int n = mNumLaps;
68        mLaps[n].soFar   = elapsed;
69        mLaps[n].thisLap = n ? (elapsed - mLaps[n-1].soFar) : elapsed;
70        mNumLaps = n+1;
71    }
72    return elapsed;
73}
74
75nsecs_t StopWatch::elapsedTime() const
76{
77    return systemTime(mClock) - mStartTime;
78}
79
80void StopWatch::reset()
81{
82    mNumLaps = 0;
83    mStartTime = systemTime(mClock);
84}
85
86
87/*****************************************************************************/
88
89}; // namespace android
90
91