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/*
* Copyright (C) 2016 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.
*/
#ifndef CPU_CPU_COLLECTOR_H_
#define CPU_CPU_COLLECTOR_H_
#include <atomic>
#include <cstdint>
#include <thread>
#include "cpu/cpu_usage_sampler.h"
namespace profiler {
class CpuCache;
class CpuUsageSampler;
class CpuCollector {
public:
// Creates a collector that will invoke |sampler| every |interval_in_us|
// microseconds.
CpuCollector(int64_t interval_in_us, CpuUsageSampler* sampler)
: sampling_interval_in_us_(interval_in_us), sampler_(*sampler) {}
~CpuCollector();
// Creates a thread that collects and saves data continually.
// Assumes |Start()| and |Stop()| are called by the same thread.
void Start();
// Stops collecting data and wait for thread exit.
// Assumes |Start()| and |Stop()| are called by the same thread.
void Stop();
private:
// Collects and saves CPU sampling data continually.
void Collect();
// Thread that sampling operations run on.
std::thread sampler_thread_;
// True if sampling operations is running.
std::atomic_bool is_running_{false};
// Holder of sampler operations.
CpuUsageSampler& sampler_;
// Sampling window size in microseconds.
int64_t sampling_interval_in_us_;
};
} // namespace profiler
#endif // CPU_CPU_COLLECTOR_H_
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