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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "base/logging.h"
#include "base/utilities.h"
#include "core/time_util.h"
#include <map>
#include <string>
#include <sys/time.h>
namespace android {
namespace filterfw {
uint64_t getTimeUs() {
static long basesec;
struct timeval tv;
uint64_t nowtime;
gettimeofday(&tv, 0);
if (basesec == 0) {
basesec = tv.tv_sec;
}
nowtime = (uint64_t)(tv.tv_sec - basesec) * (uint64_t)1000000 +
(uint64_t)tv.tv_usec;
return nowtime;
}
const uint64_t NamedStopWatch::kDefaultLoggingPeriodInFrames = 100;
NamedStopWatch::NamedStopWatch(const std::string& name)
: mName(name),
mLoggingPeriodInFrames(kDefaultLoggingPeriodInFrames),
mStartUSec(0),
mNumCalls(0),
mTotalUSec(0) {
}
void NamedStopWatch::Start() {
mStartUSec = getTimeUs();
}
void NamedStopWatch::Stop() {
if (!mStartUSec) {
return;
}
uint64_t stopUSec = getTimeUs();
if (stopUSec > mStartUSec) {
++mNumCalls;
mTotalUSec += stopUSec - mStartUSec;
if (mNumCalls % mLoggingPeriodInFrames == 0) {
const float mSec = TotalUSec() * 1.0E-3f / NumCalls();
ALOGE("%s: %f ms", Name().c_str(), mSec);
}
}
mStartUSec = 0;
}
namespace {
static NamedStopWatch* GetWatchForName(const string& watch_name) {
// TODO: this leaks the NamedStopWatch objects. Replace it with a
// singleton to avoid that and make it thread safe.
static map<string, NamedStopWatch*> watches;
NamedStopWatch* watch = FindPtrOrNull(watches, watch_name);
if (!watch) {
watch = new NamedStopWatch(watch_name);
watches[watch_name] = watch;
}
return watch;
};
} // namespace
ScopedTimer::ScopedTimer(const string& stop_watch_name) {
mWatch = GetWatchForName(stop_watch_name);
mWatch->Start();
}
} // namespace filterfw
} // namespace android
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