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 #include <utils/Log.h>
24 #include <utils/Errors.h>
25 #include <utils/StopWatch.h>
26
27 /*****************************************************************************/
28
29 namespace android {
30
31
StopWatch(const char * name,int clock,uint32_t flags)32 StopWatch::StopWatch(const char *name, int clock, uint32_t flags)
33 : mName(name), mClock(clock), mFlags(flags),
34 mStartTime(0), mNumLaps(0)
35 {
36 mStartTime = systemTime(mClock);
37 }
38
~StopWatch()39 StopWatch::~StopWatch()
40 {
41 nsecs_t elapsed = elapsedTime();
42 const int n = mNumLaps;
43 LOGD("StopWatch %s (us): %lld ", mName, ns2us(elapsed));
44 for (int i=0 ; i<n ; i++) {
45 const nsecs_t soFar = mLaps[i].soFar;
46 const nsecs_t thisLap = mLaps[i].thisLap;
47 LOGD(" [%d: %lld, %lld]", i, ns2us(soFar), ns2us(thisLap));
48 }
49 }
50
name() const51 const char* StopWatch::name() const
52 {
53 return mName;
54 }
55
lap()56 nsecs_t StopWatch::lap()
57 {
58 nsecs_t elapsed = elapsedTime();
59 if (mNumLaps >= 8) {
60 elapsed = 0;
61 } else {
62 const int n = mNumLaps;
63 mLaps[n].soFar = elapsed;
64 mLaps[n].thisLap = n ? (elapsed - mLaps[n-1].soFar) : elapsed;
65 mNumLaps = n+1;
66 }
67 return elapsed;
68 }
69
elapsedTime() const70 nsecs_t StopWatch::elapsedTime() const
71 {
72 return systemTime(mClock) - mStartTime;
73 }
74
75
76 /*****************************************************************************/
77
78 }; // namespace android
79
80