1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef WEBKIT_CHILD_WORKER_TASK_RUNNER_H_ 6 #define WEBKIT_CHILD_WORKER_TASK_RUNNER_H_ 7 8 #include <map> 9 10 #include "base/atomic_sequence_num.h" 11 #include "base/callback_forward.h" 12 #include "base/synchronization/lock.h" 13 #include "base/threading/thread_local.h" 14 #include "third_party/WebKit/public/platform/WebWorkerRunLoop.h" 15 #include "webkit/child/webkit_child_export.h" 16 17 namespace webkit_glue { 18 19 class WEBKIT_CHILD_EXPORT WorkerTaskRunner { 20 public: 21 WorkerTaskRunner(); 22 23 bool PostTask(int id, const base::Closure& task); 24 int PostTaskToAllThreads(const base::Closure& task); 25 int CurrentWorkerId(); 26 static WorkerTaskRunner* Instance(); 27 28 class WEBKIT_CHILD_EXPORT Observer { 29 public: 30 virtual ~Observer() {} 31 virtual void OnWorkerRunLoopStopped() = 0; 32 }; 33 // Add/Remove an observer that will get notified when the current worker run 34 // loop is stopping. This observer will not get notified when other threads 35 // are stopping. It's only valid to call these on a worker thread. 36 void AddStopObserver(Observer* observer); 37 void RemoveStopObserver(Observer* observer); 38 39 private: 40 friend class WebKitPlatformSupportChildImpl; 41 friend class WorkerTaskRunnerTest; 42 43 typedef std::map<int, WebKit::WebWorkerRunLoop> IDToLoopMap; 44 45 ~WorkerTaskRunner(); 46 void OnWorkerRunLoopStarted(const WebKit::WebWorkerRunLoop& loop); 47 void OnWorkerRunLoopStopped(const WebKit::WebWorkerRunLoop& loop); 48 49 struct ThreadLocalState; 50 base::ThreadLocalPointer<ThreadLocalState> current_tls_; 51 52 base::AtomicSequenceNumber id_sequence_; 53 IDToLoopMap loop_map_; 54 base::Lock loop_map_lock_; 55 }; 56 57 } // namespace webkit_glue 58 59 #endif // WEBKIT_CHILD_WORKER_TASK_RUNNER_H_ 60
