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/*
* Copyright (C) 2020 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.
*/
#pragma once
#include <inttypes.h>
#include <stdio.h>
#include <atomic>
#include <functional>
#include <memory>
#include <thread>
#include <unordered_set>
#include <vector>
#include "event_attr.h"
#include "record.h"
namespace simpleperf {
class MapRecordReader {
public:
MapRecordReader(const perf_event_attr& attr, uint64_t event_id, bool keep_non_executable_maps)
: attr_(attr), event_id_(event_id), keep_non_executable_maps_(keep_non_executable_maps) {}
const perf_event_attr& Attr() { return attr_; }
void SetCallback(const std::function<bool(Record*)>& callback) { callback_ = callback; }
bool ReadKernelMaps();
// Read process maps and all thread names in a process.
bool ReadProcessMaps(pid_t pid, uint64_t timestamp);
// Read process maps and selected thread names in a process.
bool ReadProcessMaps(pid_t pid, const std::unordered_set<pid_t>& tids, uint64_t timestamp);
private:
const perf_event_attr& attr_;
const uint64_t event_id_;
const bool keep_non_executable_maps_;
std::function<bool(Record*)> callback_;
};
// Create a thread for reading maps while recording. The maps are stored in a temporary file, and
// read back after recording.
class MapRecordThread {
public:
MapRecordThread(const MapRecordReader& map_record_reader);
~MapRecordThread();
bool Join();
bool ReadMapRecords(const std::function<bool(Record*)>& callback);
private:
// functions running in the map record thread
bool RunThread();
bool WriteRecordToFile(Record* record);
MapRecordReader map_record_reader_;
std::unique_ptr<TemporaryFile> tmpfile_;
std::unique_ptr<FILE, decltype(&fclose)> fp_;
std::thread thread_;
std::atomic<bool> early_stop_ = false;
std::atomic<bool> thread_result_ = false;
};
} // namespace simpleperf
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