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Side by Side Diff: content/child/worker_task_runner.h

Issue 937313003: chrome: Remove the use of WebWorkerRunLoop. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: . Created 5 years, 9 months ago
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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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