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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef CONTENT_CHILD_WORKER_TASK_RUNNER_H_ | 5 #ifndef CONTENT_CHILD_WORKER_TASK_RUNNER_H_ |
| 6 #define CONTENT_CHILD_WORKER_TASK_RUNNER_H_ | 6 #define CONTENT_CHILD_WORKER_TASK_RUNNER_H_ |
| 7 | 7 |
| 8 #include <map> | 8 #include <map> |
| 9 | 9 |
| 10 #include "base/callback_forward.h" | 10 #include "base/callback_forward.h" |
| 11 #include "base/memory/ref_counted.h" | 11 #include "base/memory/ref_counted.h" |
| 12 #include "base/synchronization/lock.h" | 12 #include "base/synchronization/lock.h" |
| 13 #include "base/threading/platform_thread.h" | 13 #include "base/threading/platform_thread.h" |
| 14 #include "base/threading/thread_local.h" | 14 #include "base/threading/thread_local.h" |
| 15 #include "content/common/content_export.h" | 15 #include "content/common/content_export.h" |
| 16 #include "third_party/WebKit/public/platform/WebWorkerRunLoop.h" | |
| 17 | 16 |
| 18 namespace base { | 17 namespace base { |
| 19 class TaskRunner; | 18 class TaskRunner; |
| 20 } | 19 } |
| 21 | 20 |
| 22 namespace content { | 21 namespace content { |
| 23 | 22 |
| 24 class CONTENT_EXPORT WorkerTaskRunner { | 23 class CONTENT_EXPORT WorkerTaskRunner { |
| 25 public: | 24 public: |
| 26 WorkerTaskRunner(); | 25 WorkerTaskRunner(); |
| 27 | 26 |
| 28 bool PostTask(int id, const base::Closure& task); | 27 bool PostTask(int id, const base::Closure& task); |
| 29 int PostTaskToAllThreads(const base::Closure& task); | 28 int PostTaskToAllThreads(const base::Closure& task); |
| 30 int CurrentWorkerId(); | 29 int CurrentWorkerId(); |
| 31 static WorkerTaskRunner* Instance(); | 30 static WorkerTaskRunner* Instance(); |
| 32 | 31 |
| 33 class CONTENT_EXPORT Observer { | 32 class CONTENT_EXPORT Observer { |
| 34 public: | 33 public: |
| 35 virtual ~Observer() {} | 34 virtual ~Observer() {} |
| 36 virtual void OnWorkerRunLoopStopped() = 0; | 35 virtual void OnWorkerRunLoopStopped() = 0; |
| 37 }; | 36 }; |
| 38 // Add/Remove an observer that will get notified when the current worker run | 37 // Add/Remove an observer that will get notified when the current worker run |
| 39 // loop is stopping. This observer will not get notified when other threads | 38 // loop is stopping. This observer will not get notified when other threads |
| 40 // are stopping. It's only valid to call these on a worker thread. | 39 // are stopping. It's only valid to call these on a worker thread. |
| 41 void AddStopObserver(Observer* observer); | 40 void AddStopObserver(Observer* observer); |
| 42 void RemoveStopObserver(Observer* observer); | 41 void RemoveStopObserver(Observer* observer); |
| 43 | 42 |
| 44 void OnWorkerRunLoopStarted(const blink::WebWorkerRunLoop& loop); | 43 void OnWorkerRunLoopStarted(); |
| 45 void OnWorkerRunLoopStopped(const blink::WebWorkerRunLoop& loop); | 44 void OnWorkerRunLoopStopped(); |
| 46 | 45 |
| 47 base::TaskRunner* GetTaskRunnerFor(int worker_id); | 46 base::TaskRunner* GetTaskRunnerFor(int worker_id); |
| 48 | 47 |
| 49 private: | 48 private: |
| 50 friend class WorkerTaskRunnerTest; | 49 friend class WorkerTaskRunnerTest; |
| 51 | 50 |
| 52 using IDToTaskRunnerMap = std::map<base::PlatformThreadId, base::TaskRunner*>; | 51 using IDToTaskRunnerMap = std::map<base::PlatformThreadId, base::TaskRunner*>; |
| 53 | 52 |
| 54 ~WorkerTaskRunner(); | 53 ~WorkerTaskRunner(); |
| 55 | 54 |
| 56 // It is possible for an IPC message to arrive for a worker thread that has | 55 // It is possible for an IPC message to arrive for a worker thread that has |
| 57 // already gone away. In such cases, it is still necessary to provide a | 56 // already gone away. In such cases, it is still necessary to provide a |
| 58 // task-runner for that particular thread, because otherwise the message will | 57 // task-runner for that particular thread, because otherwise the message will |
| 59 // end up being handled as per usual in the main-thread, causing incorrect | 58 // end up being handled as per usual in the main-thread, causing incorrect |
| 60 // results. |task_runner_for_dead_worker_| is used to handle such messages, | 59 // results. |task_runner_for_dead_worker_| is used to handle such messages, |
| 61 // which silently discards all the tasks it receives. | 60 // which silently discards all the tasks it receives. |
| 62 scoped_refptr<base::TaskRunner> task_runner_for_dead_worker_; | 61 scoped_refptr<base::TaskRunner> task_runner_for_dead_worker_; |
| 63 | 62 |
| 64 struct ThreadLocalState; | 63 struct ThreadLocalState; |
| 65 base::ThreadLocalPointer<ThreadLocalState> current_tls_; | 64 base::ThreadLocalPointer<ThreadLocalState> current_tls_; |
| 66 | 65 |
| 67 IDToTaskRunnerMap task_runner_map_; | 66 IDToTaskRunnerMap task_runner_map_; |
| 68 base::Lock task_runner_map_lock_; | 67 base::Lock task_runner_map_lock_; |
| 69 }; | 68 }; |
| 70 | 69 |
| 71 } // namespace content | 70 } // namespace content |
| 72 | 71 |
| 73 #endif // CONTENT_CHILD_WORKER_TASK_RUNNER_H_ | 72 #endif // CONTENT_CHILD_WORKER_TASK_RUNNER_H_ |
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