2 * Copyright (C) 2016 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef SIMPLE_PERF_IOEVENT_LOOP_H_
18 #define SIMPLE_PERF_IOEVENT_LOOP_H_
27 typedef IOEvent* IOEventRef;
30 // IOEventLoop is a class wrapper of libevent, it monitors events happened,
31 // and calls the corresponding callbacks. Possible events are: file ready to
32 // read, file ready to write, signal happens, periodic timer timeout.
38 // Register a read Event, so [callback] is called when [fd] can be read
39 // without blocking. If registered successfully, return the reference
40 // to control the Event, otherwise return nullptr.
41 IOEventRef AddReadEvent(int fd, const std::function<bool()>& callback);
43 // Register a write Event, so [callback] is called when [fd] can be written
45 IOEventRef AddWriteEvent(int fd, const std::function<bool()>& callback);
47 // Register a signal Event, so [callback] is called each time signal [sig]
49 bool AddSignalEvent(int sig, const std::function<bool()>& callback);
51 // Register a vector of signal Events.
52 bool AddSignalEvents(std::vector<int> sigs,
53 const std::function<bool()>& callback);
55 // Register a periodic Event, so [callback] is called periodically every
57 bool AddPeriodicEvent(timeval duration,
58 const std::function<bool()>& callback);
60 // Run a loop polling for Events. It only exits when ExitLoop() is called
61 // in a callback function of registered Events.
64 // Exit the loop started by RunLoop().
67 // Disable an Event, which can be enabled later.
68 static bool DisableEvent(IOEventRef ref);
69 // Enable a disabled Event.
70 static bool EnableEvent(IOEventRef ref);
72 // Unregister an Event.
73 static bool DelEvent(IOEventRef ref);
77 IOEventRef AddEvent(int fd_or_sig, short events, timeval* timeout,
78 const std::function<bool()>& callback);
79 static void EventCallbackFn(int, short, void*);
82 std::vector<std::unique_ptr<IOEvent>> events_;
86 #endif // SIMPLE_PERF_IOEVENT_LOOP_H_