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