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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 SIMPLE_PERF_IOEVENT_LOOP_H_
#define SIMPLE_PERF_IOEVENT_LOOP_H_
#include <stdint.h>
#include <time.h>
#include <functional>
#include <memory>
#include <vector>
struct IOEvent;
typedef IOEvent* IOEventRef;
struct event_base;
// IOEventLoop is a class wrapper of libevent, it monitors events happened,
// and calls the corresponding callbacks. Possible events are: file ready to
// read, file ready to write, signal happens, periodic timer timeout.
class IOEventLoop {
public:
IOEventLoop();
~IOEventLoop();
// Use precise timer for periodic events which want precision in ms.
bool UsePreciseTimer();
// Register a read Event, so [callback] is called when [fd] can be read
// without blocking. If registered successfully, return the reference
// to control the Event, otherwise return nullptr.
IOEventRef AddReadEvent(int fd, const std::function<bool()>& callback);
// Register a write Event, so [callback] is called when [fd] can be written
// without blocking.
IOEventRef AddWriteEvent(int fd, const std::function<bool()>& callback);
// Register a signal Event, so [callback] is called each time signal [sig]
// happens.
bool AddSignalEvent(int sig, const std::function<bool()>& callback);
// Register a vector of signal Events.
bool AddSignalEvents(std::vector<int> sigs,
const std::function<bool()>& callback);
// Register a periodic Event, so [callback] is called periodically every
// [duration].
IOEventRef AddPeriodicEvent(timeval duration, const std::function<bool()>& callback);
// Run a loop polling for Events. It only exits when ExitLoop() is called
// in a callback function of registered Events.
bool RunLoop();
// Exit the loop started by RunLoop().
bool ExitLoop();
// Disable an Event, which can be enabled later.
static bool DisableEvent(IOEventRef ref);
// Enable a disabled Event.
static bool EnableEvent(IOEventRef ref);
// Unregister an Event.
static bool DelEvent(IOEventRef ref);
private:
bool EnsureInit();
IOEventRef AddEvent(int fd_or_sig, int16_t events, timeval* timeout,
const std::function<bool()>& callback);
static void EventCallbackFn(int, int16_t, void*);
event_base* ebase_;
std::vector<std::unique_ptr<IOEvent>> events_;
bool has_error_;
bool use_precise_timer_;
bool in_loop_;
};
#endif // SIMPLE_PERF_IOEVENT_LOOP_H_
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