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 // Use precise timer for periodic events which want precision in ms.
39 bool UsePreciseTimer();
41 // Register a read Event, so [callback] is called when [fd] can be read
42 // without blocking. If registered successfully, return the reference
43 // to control the Event, otherwise return nullptr.
44 IOEventRef AddReadEvent(int fd, const std::function<bool()>& callback);
46 // Register a write Event, so [callback] is called when [fd] can be written
48 IOEventRef AddWriteEvent(int fd, const std::function<bool()>& callback);
50 // Register a signal Event, so [callback] is called each time signal [sig]
52 bool AddSignalEvent(int sig, const std::function<bool()>& callback);
54 // Register a vector of signal Events.
55 bool AddSignalEvents(std::vector<int> sigs,
56 const std::function<bool()>& callback);
58 // Register a periodic Event, so [callback] is called periodically every
60 bool AddPeriodicEvent(timeval duration,
61 const std::function<bool()>& callback);
63 // Run a loop polling for Events. It only exits when ExitLoop() is called
64 // in a callback function of registered Events.
67 // Exit the loop started by RunLoop().
70 // Disable an Event, which can be enabled later.
71 static bool DisableEvent(IOEventRef ref);
72 // Enable a disabled Event.
73 static bool EnableEvent(IOEventRef ref);
75 // Unregister an Event.
76 static bool DelEvent(IOEventRef ref);
80 IOEventRef AddEvent(int fd_or_sig, short events, timeval* timeout,
81 const std::function<bool()>& callback);
82 static void EventCallbackFn(int, short, void*);
85 std::vector<std::unique_ptr<IOEvent>> events_;
87 bool use_precise_timer_;
90 #endif // SIMPLE_PERF_IOEVENT_LOOP_H_