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commonlibrary/c_utils/base/src/io_event_epoll.h

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+/*
+ * Copyright (c) 2023 Huawei Device Co., Ltd.
+ * 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 UTILS_EVENT_DEMULTIPLEXER_H
+#define UTILS_EVENT_DEMULTIPLEXER_H
+
+#include <mutex>
+#include <cstdint>
+#include <vector>
+#include <set>
+#include "io_event_common.h"
+#include "errors.h"
+
+namespace OHOS {
+namespace Utils {
+
+class IOEventHandler;
+
+class IOEventEpoll {
+public:
+    using REventId = uint32_t;
+    using EPEventId = uint32_t;
+
+    static constexpr int EPOLL_MAX_EVENTS_INIT = 8;
+    static constexpr int EXPANSION_COEFF = 2;
+
+    IOEventEpoll();
+    IOEventEpoll(const IOEventEpoll&) = delete;
+    IOEventEpoll& operator=(const IOEventEpoll&) = delete;
+    virtual ~IOEventEpoll();
+
+    virtual ErrCode SetUp();
+    virtual void CleanUp();
+
+    virtual ErrCode Polling(int timeout, std::vector<std::pair<int, REventId>>&);
+
+    virtual ErrCode ModifyEvents(int fd, REventId events);
+
+private:
+    EPEventId Reactor2Epoll(REventId reactorEvent);
+    REventId Epoll2Reactor(EPEventId epollEvents);
+    bool OperateEpoll(int op, int fd, EPEventId epollEvents);
+
+    int epollFd_;
+    int maxEvents_;
+    std::set<int> interestFds_;
+};
+
+} // Utils
+} // OHOS
+#endif /* UTILS_EVENT_DEMULTIPLEXER_H_ */