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 <utils/StopWatch.h>
20
21 /* for PRId64 */
22 #ifndef __STDC_FORMAT_MACROS
23 #define __STDC_FORMAT_MACROS 1
24 #endif
25 #include <inttypes.h>
26
27 #include <utils/Log.h>
28
29 /*****************************************************************************/
30
31 namespace android {
32
StopWatch(const char * name,int clock)33 StopWatch::StopWatch(const char* name, int clock) : mName(name), mClock(clock) {
34 reset();
35 }
36
~StopWatch()37 StopWatch::~StopWatch()
38 {
39 nsecs_t elapsed = elapsedTime();
40 const int n = mNumLaps;
41 ALOGD("StopWatch %s (us): %" PRId64 " ", mName, ns2us(elapsed));
42 for (int i=0 ; i<n ; i++) {
43 const nsecs_t soFar = mLaps[i].soFar;
44 const nsecs_t thisLap = mLaps[i].thisLap;
45 ALOGD(" [%d: %" PRId64 ", %" PRId64, i, ns2us(soFar), ns2us(thisLap));
46 }
47 }
48
name() const49 const char* StopWatch::name() const
50 {
51 return mName;
52 }
53
lap()54 nsecs_t StopWatch::lap()
55 {
56 nsecs_t elapsed = elapsedTime();
57 if (mNumLaps >= 8) {
58 elapsed = 0;
59 } else {
60 const int n = mNumLaps;
61 mLaps[n].soFar = elapsed;
62 mLaps[n].thisLap = n ? (elapsed - mLaps[n-1].soFar) : elapsed;
63 mNumLaps = n+1;
64 }
65 return elapsed;
66 }
67
elapsedTime() const68 nsecs_t StopWatch::elapsedTime() const
69 {
70 return systemTime(mClock) - mStartTime;
71 }
72
reset()73 void StopWatch::reset()
74 {
75 mNumLaps = 0;
76 mStartTime = systemTime(mClock);
77 }
78
79
80 /*****************************************************************************/
81
82 }; // namespace android
83
84