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
35 namespace android {
36
37
StopWatch(const char * name,int clock,uint32_t flags)38 StopWatch::StopWatch(const char *name, int clock, uint32_t flags)
39 : mName(name), mClock(clock), mFlags(flags)
40 {
41 reset();
42 }
43
~StopWatch()44 StopWatch::~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
name() const56 const char* StopWatch::name() const
57 {
58 return mName;
59 }
60
lap()61 nsecs_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
elapsedTime() const75 nsecs_t StopWatch::elapsedTime() const
76 {
77 return systemTime(mClock) - mStartTime;
78 }
79
reset()80 void StopWatch::reset()
81 {
82 mNumLaps = 0;
83 mStartTime = systemTime(mClock);
84 }
85
86
87 /*****************************************************************************/
88
89 }; // namespace android
90
91