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_UNIX_TASK_RUNNER_H_ 18 #define INCLUDE_PERFETTO_BASE_UNIX_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 <deque> 28 #include <map> 29 #include <mutex> 30 #include <vector> 31 32 namespace perfetto { 33 namespace base { 34 35 // Runs a task runner on the current thread. 36 class UnixTaskRunner : public TaskRunner { 37 public: 38 UnixTaskRunner(); 39 ~UnixTaskRunner() override; 40 41 // Start executing tasks. Doesn't return until Quit() is called. Run() may be 42 // called multiple times on the same task runner. 43 void Run(); 44 void Quit(); 45 46 // Checks whether there are any pending immediate tasks to run. Note that 47 // delayed tasks don't count even if they are due to run. 48 bool IsIdleForTesting(); 49 50 // TaskRunner implementation: 51 void PostTask(std::function<void()>) override; 52 void PostDelayedTask(std::function<void()>, uint32_t delay_ms) override; 53 void AddFileDescriptorWatch(int fd, std::function<void()>) override; 54 void RemoveFileDescriptorWatch(int fd) override; 55 56 private: 57 void WakeUp(); 58 59 void UpdateWatchTasksLocked(); 60 61 int GetDelayMsToNextTaskLocked() const; 62 void RunImmediateAndDelayedTask(); 63 void PostFileDescriptorWatches(); 64 void RunFileDescriptorWatch(int fd); 65 66 ThreadChecker thread_checker_; 67 68 ScopedFile control_read_; 69 ScopedFile control_write_; 70 71 std::vector<struct pollfd> poll_fds_; 72 73 // --- Begin lock-protected members --- 74 75 std::mutex lock_; 76 77 std::deque<std::function<void()>> immediate_tasks_; 78 std::multimap<TimeMillis, std::function<void()>> delayed_tasks_; 79 bool quit_ = false; 80 81 struct WatchTask { 82 std::function<void()> callback; 83 size_t poll_fd_index; // Index into |poll_fds_|. 84 }; 85 86 std::map<int, WatchTask> watch_tasks_; 87 bool watch_tasks_changed_ = false; 88 89 // --- End lock-protected members --- 90 }; 91 92 } // namespace base 93 } // namespace perfetto 94 95 #endif // INCLUDE_PERFETTO_BASE_UNIX_TASK_RUNNER_H_ 96