| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CONTENT_CHILD_WORKER_TASK_RUNNER_H_ |
| #define CONTENT_CHILD_WORKER_TASK_RUNNER_H_ |
| |
| #include <map> |
| |
| #include "base/callback_forward.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/synchronization/lock.h" |
| #include "base/threading/platform_thread.h" |
| #include "content/common/content_export.h" |
| #include "content/public/child/worker_thread.h" |
| |
| namespace base { |
| class TaskRunner; |
| } |
| |
| namespace content { |
| |
| class CONTENT_EXPORT WorkerTaskRunner { |
| public: |
| WorkerTaskRunner(); |
| |
| bool PostTask(int id, const base::Closure& task); |
| int PostTaskToAllThreads(const base::Closure& task); |
| static WorkerTaskRunner* Instance(); |
| |
| void DidStartWorkerRunLoop(); |
| void WillStopWorkerRunLoop(); |
| |
| base::TaskRunner* GetTaskRunnerFor(int worker_id); |
| |
| private: |
| friend class WorkerTaskRunnerTest; |
| |
| using IDToTaskRunnerMap = std::map<base::PlatformThreadId, base::TaskRunner*>; |
| |
| ~WorkerTaskRunner(); |
| |
| // It is possible for an IPC message to arrive for a worker thread that has |
| // already gone away. In such cases, it is still necessary to provide a |
| // task-runner for that particular thread, because otherwise the message will |
| // end up being handled as per usual in the main-thread, causing incorrect |
| // results. |task_runner_for_dead_worker_| is used to handle such messages, |
| // which silently discards all the tasks it receives. |
| scoped_refptr<base::TaskRunner> task_runner_for_dead_worker_; |
| |
| IDToTaskRunnerMap task_runner_map_; |
| base::Lock task_runner_map_lock_; |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_CHILD_WORKER_TASK_RUNNER_H_ |