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
33 namespace android {
34
35
StopWatch(const char * name,int clock,uint32_t flags)36 StopWatch::StopWatch(const char *name, int clock, uint32_t flags)
37 : mName(name), mClock(clock), mFlags(flags)
38 {
39 reset();
40 }
41
~StopWatch()42 StopWatch::~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
name() const54 const char* StopWatch::name() const
55 {
56 return mName;
57 }
58
lap()59 nsecs_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
elapsedTime() const73 nsecs_t StopWatch::elapsedTime() const
74 {
75 return systemTime(mClock) - mStartTime;
76 }
77
reset()78 void StopWatch::reset()
79 {
80 mNumLaps = 0;
81 mStartTime = systemTime(mClock);
82 }
83
84
85 /*****************************************************************************/
86
87 }; // namespace android
88
89