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