| /* |
| * Copyright (C) 2019 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 INCLUDE_PERFETTO_EXT_BASE_THREAD_TASK_RUNNER_H_ |
| #define INCLUDE_PERFETTO_EXT_BASE_THREAD_TASK_RUNNER_H_ |
| |
| #include <functional> |
| #include <thread> |
| |
| #include "perfetto/ext/base/unix_task_runner.h" |
| |
| namespace perfetto { |
| namespace base { |
| |
| // A UnixTaskRunner backed by a dedicated task thread. Shuts down the runner and |
| // joins the thread upon destruction. Can be moved to transfer ownership. |
| // |
| // Guarantees that: |
| // * the UnixTaskRunner will be constructed and destructed on the task thread. |
| // * the task thread will live for the lifetime of the UnixTaskRunner. |
| // |
| class PERFETTO_EXPORT_COMPONENT ThreadTaskRunner : public TaskRunner { |
| public: |
| static ThreadTaskRunner CreateAndStart(const std::string& name = "") { |
| return ThreadTaskRunner(name); |
| } |
| |
| ThreadTaskRunner(const ThreadTaskRunner&) = delete; |
| ThreadTaskRunner& operator=(const ThreadTaskRunner&) = delete; |
| |
| ThreadTaskRunner(ThreadTaskRunner&&) noexcept; |
| ThreadTaskRunner& operator=(ThreadTaskRunner&&); |
| ~ThreadTaskRunner() override; |
| |
| // Executes the given function on the task runner thread and blocks the caller |
| // thread until the function has run. |
| void PostTaskAndWaitForTesting(std::function<void()>); |
| |
| // Can be called from another thread to get the CPU time of the thread the |
| // task-runner is executing on. |
| uint64_t GetThreadCPUTimeNsForTesting(); |
| |
| // Returns a pointer to the UnixTaskRunner, which is valid for the lifetime of |
| // this ThreadTaskRunner object (unless this object is moved-from, in which |
| // case the pointer remains valid for the lifetime of the new owning |
| // ThreadTaskRunner). |
| // |
| // Warning: do not call Quit() on the returned runner pointer, the termination |
| // should be handled exclusively by this class' destructor. |
| UnixTaskRunner* get() const { return task_runner_; } |
| |
| // TaskRunner implementation. |
| // These methods just proxy to the underlying task_runner_. |
| void PostTask(std::function<void()>) override; |
| void PostDelayedTask(std::function<void()>, uint32_t delay_ms) override; |
| void AddFileDescriptorWatch(PlatformHandle, std::function<void()>) override; |
| void RemoveFileDescriptorWatch(PlatformHandle) override; |
| bool RunsTasksOnCurrentThread() const override; |
| |
| private: |
| explicit ThreadTaskRunner(const std::string& name); |
| void RunTaskThread(std::function<void(UnixTaskRunner*)> initializer); |
| |
| std::thread thread_; |
| std::string name_; |
| UnixTaskRunner* task_runner_ = nullptr; |
| }; |
| |
| } // namespace base |
| } // namespace perfetto |
| |
| #endif // INCLUDE_PERFETTO_EXT_BASE_THREAD_TASK_RUNNER_H_ |