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#define __STDC_FORMAT_MACROS 1
25#include <inttypes.h>
26
27#include <utils/Log.h>
28#include <utils/Errors.h>
29#include <utils/StopWatch.h>
30
31/*****************************************************************************/
32
33namespace android {
34
35
36StopWatch::StopWatch(const char *name, int clock, uint32_t flags)
37    :   mName(name), mClock(clock), mFlags(flags)
38{
39    reset();
40}
41
42StopWatch::~StopWatch()
43{
44    nsecs_t elapsed = elapsedTime();
45    const int n = mNumLaps;
46    ALOGD("StopWatch %s (us): %" PRId64 " ", mName, ns2us(elapsed));
47    for (int i=0 ; i<n ; i++) {
48        const nsecs_t soFar = mLaps[i].soFar;
49        const nsecs_t thisLap = mLaps[i].thisLap;
50        ALOGD(" [%d: %" PRId64 ", %" PRId64, i, ns2us(soFar), ns2us(thisLap));
51    }
52}
53
54const char* StopWatch::name() const
55{
56    return mName;
57}
58
59nsecs_t StopWatch::lap()
60{
61    nsecs_t elapsed = elapsedTime();
62    if (mNumLaps >= 8) {
63        elapsed = 0;
64    } else {
65        const int n = mNumLaps;
66        mLaps[n].soFar   = elapsed;
67        mLaps[n].thisLap = n ? (elapsed - mLaps[n-1].soFar) : elapsed;
68        mNumLaps = n+1;
69    }
70    return elapsed;
71}
72
73nsecs_t StopWatch::elapsedTime() const
74{
75    return systemTime(mClock) - mStartTime;
76}
77
78void StopWatch::reset()
79{
80    mNumLaps = 0;
81    mStartTime = systemTime(mClock);
82}
83
84
85/*****************************************************************************/
86
87}; // namespace android
88
89