1/*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#ifndef UTILS_EVENT_DEMULTIPLEXER_H
17#define UTILS_EVENT_DEMULTIPLEXER_H
18
19#include <mutex>
20#include <cstdint>
21#include <vector>
22#include <set>
23#include "io_event_common.h"
24#include "errors.h"
25
26namespace OHOS {
27namespace Utils {
28
29class IOEventHandler;
30
31class IOEventEpoll {
32public:
33    using REventId = uint32_t;
34    using EPEventId = uint32_t;
35
36    static constexpr int EPOLL_MAX_EVENTS_INIT = 8;
37    static constexpr int EXPANSION_COEFF = 2;
38
39    IOEventEpoll();
40    IOEventEpoll(const IOEventEpoll&) = delete;
41    IOEventEpoll& operator=(const IOEventEpoll&) = delete;
42    virtual ~IOEventEpoll();
43
44    virtual ErrCode SetUp();
45    virtual void CleanUp();
46
47    virtual ErrCode Polling(int timeout, std::vector<std::pair<int, REventId>>&);
48
49    virtual ErrCode ModifyEvents(int fd, REventId events);
50
51private:
52    EPEventId Reactor2Epoll(REventId reactorEvent);
53    REventId Epoll2Reactor(EPEventId epollEvents);
54    bool OperateEpoll(int op, int fd, EPEventId epollEvents);
55
56    int epollFd_;
57    int maxEvents_;
58    std::set<int> interestFds_;
59};
60
61} // Utils
62} // OHOS
63#endif /* UTILS_EVENT_DEMULTIPLEXER_H_ */
64