1/* 2 * Copyright (C) 2011 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#include "time_util.h" 18#include "utilities.h" 19 20#include <cutils/log.h> 21#include <sys/time.h> 22#include <map> 23 24namespace android { 25namespace filterfw { 26 27uint64_t getTimeUs() { 28 static long basesec; 29 struct timeval tv; 30 uint64_t nowtime; 31 gettimeofday(&tv, 0); 32 if (basesec == 0) { 33 basesec = tv.tv_sec; 34 } 35 nowtime = (uint64_t)(tv.tv_sec - basesec) * (uint64_t)1000000 + 36 (uint64_t)tv.tv_usec; 37 return nowtime; 38} 39 40const uint64_t NamedStopWatch::kDefaultLoggingPeriodInFrames = 100; 41 42NamedStopWatch::NamedStopWatch(const std::string& name) 43 : mName(name), 44 mLoggingPeriodInFrames(kDefaultLoggingPeriodInFrames), 45 mStartUSec(0), 46 mNumCalls(0), 47 mTotalUSec(0) { 48} 49 50void NamedStopWatch::Start() { 51 mStartUSec = getTimeUs(); 52} 53 54void NamedStopWatch::Stop() { 55 if (!mStartUSec) { 56 return; 57 } 58 uint64_t stopUSec = getTimeUs(); 59 if (stopUSec > mStartUSec) { 60 ++mNumCalls; 61 mTotalUSec += stopUSec - mStartUSec; 62 if (mNumCalls % mLoggingPeriodInFrames == 0) { 63 const float mSec = TotalUSec() * 1.0E-3f / NumCalls(); 64 ALOGE("%s: %f ms", Name().c_str(), mSec); 65 } 66 } 67 mStartUSec = 0; 68} 69 70namespace { 71static NamedStopWatch* GetWatchForName(const std::string& watch_name) { 72 // TODO: this leaks the NamedStopWatch objects. Replace it with a 73 // singleton to avoid that and make it thread safe. 74 static std::map<std::string, NamedStopWatch*> watches; 75 NamedStopWatch* watch = FindPtrOrNull(watches, watch_name); 76 if (!watch) { 77 watch = new NamedStopWatch(watch_name); 78 watches[watch_name] = watch; 79 } 80 return watch; 81}; 82} // namespace 83 84ScopedTimer::ScopedTimer(const std::string& stop_watch_name) { 85 mWatch = GetWatchForName(stop_watch_name); 86 mWatch->Start(); 87} 88 89} // namespace filterfw 90} // namespace android 91