1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 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 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 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. 15 */ 16 17 #ifndef INCLUDE_PERFETTO_BASE_ANDROID_TASK_RUNNER_H_ 18 #define INCLUDE_PERFETTO_BASE_ANDROID_TASK_RUNNER_H_ 19 20 #include "perfetto/base/scoped_file.h" 21 #include "perfetto/base/task_runner.h" 22 #include "perfetto/base/thread_checker.h" 23 #include "perfetto/base/time.h" 24 25 #include <poll.h> 26 #include <chrono> 27 #include <map> 28 #include <mutex> 29 #include <queue> 30 31 #include <android/looper.h> 32 33 namespace perfetto { 34 namespace base { 35 36 // Runs a task runner on a thread owned by an Android Looper (ALooper). 37 class AndroidTaskRunner : public TaskRunner { 38 public: 39 AndroidTaskRunner(); 40 ~AndroidTaskRunner() override; 41 42 // The following methods are only used in cases where the caller wants to take 43 // ownership of the current thread (e.g., tests and standalone tools). 44 // Normally the Android Framework runs the event loop on the thread. Run() can 45 // only be called from the main thread but Quit() can be called from any 46 // thread. 47 void Run(); 48 void Quit(); 49 50 // Checks whether there are any pending immediate tasks to run. Note that 51 // delayed tasks don't count even if they are due to run. Can only be called 52 // from the main thread. 53 bool IsIdleForTesting(); 54 55 // TaskRunner implementation: 56 void PostTask(std::function<void()>) override; 57 void PostDelayedTask(std::function<void()>, uint32_t delay_ms) override; 58 void AddFileDescriptorWatch(int fd, std::function<void()>) override; 59 void RemoveFileDescriptorWatch(int fd) override; 60 61 private: 62 bool OnFileDescriptorEvent(int signalled_fd, int events); 63 void RunImmediateTask(); 64 void RunDelayedTask(); 65 66 void GetNextDelayedTaskRunTimeLocked(struct itimerspec* runtime); 67 68 void ScheduleImmediateWakeUp(); 69 void ScheduleDelayedWakeUp(TimeMillis time); 70 71 ALooper* const looper_; 72 ScopedFile immediate_event_; 73 ScopedFile delayed_timer_; 74 75 ThreadChecker thread_checker_; 76 77 // --- Begin lock-protected members. 78 std::mutex lock_; 79 // Note: std::deque allocates blocks of 4k in some implementations. Consider 80 // another data structure if we end up having many task runner instances. 81 std::deque<std::function<void()>> immediate_tasks_; 82 std::multimap<TimeMillis, std::function<void()>> delayed_tasks_; 83 std::map<int, std::function<void()>> watch_tasks_; 84 bool quit_ = false; 85 // --- End lock-protected members. 86 }; 87 88 } // namespace base 89 } // namespace perfetto 90 91 #endif // INCLUDE_PERFETTO_BASE_ANDROID_TASK_RUNNER_H_ 92
