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| 1 // Copyright 2015 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 CC_RASTER_SINGLE_THREAD_TASK_GRAPH_RUNNER_H_ |
| 6 #define CC_RASTER_SINGLE_THREAD_TASK_GRAPH_RUNNER_H_ |
| 7 |
| 8 #include "base/memory/scoped_ptr.h" |
| 9 #include "base/synchronization/condition_variable.h" |
| 10 #include "base/threading/simple_thread.h" |
| 11 #include "cc/raster/task_graph_runner.h" |
| 12 #include "cc/raster/task_graph_work_queue.h" |
| 13 |
| 14 namespace base { |
| 15 class SimpleThread; |
| 16 } |
| 17 |
| 18 namespace cc { |
| 19 |
| 20 // Runs TaskGraphs asynchronously using a single worker thread. |
| 21 class CC_EXPORT SingleThreadTaskGraphRunner |
| 22 : public TaskGraphRunner, |
| 23 public base::DelegateSimpleThread::Delegate { |
| 24 public: |
| 25 SingleThreadTaskGraphRunner(); |
| 26 ~SingleThreadTaskGraphRunner() override; |
| 27 |
| 28 // Overridden from TaskGraphRunner: |
| 29 NamespaceToken GetNamespaceToken() override; |
| 30 void ScheduleTasks(NamespaceToken token, TaskGraph* graph) override; |
| 31 void WaitForTasksToFinishRunning(NamespaceToken token) override; |
| 32 void CollectCompletedTasks(NamespaceToken token, |
| 33 Task::Vector* completed_tasks) override; |
| 34 |
| 35 // Overridden from base::DelegateSimpleThread::Delegate: |
| 36 void Run() override; |
| 37 |
| 38 void Start(const std::string& thread_name, |
| 39 const base::SimpleThread::Options& thread_options); |
| 40 void Shutdown(); |
| 41 |
| 42 private: |
| 43 void RunTaskWithLockAcquired(); |
| 44 |
| 45 scoped_ptr<base::SimpleThread> thread_; |
| 46 |
| 47 // Lock to exclusively access all the following members that are used to |
| 48 // implement the TaskRunner interfaces. |
| 49 base::Lock lock_; |
| 50 |
| 51 // Stores the actual tasks to be run by this runner, sorted by priority. |
| 52 TaskGraphWorkQueue work_queue_; |
| 53 |
| 54 // Condition variable that is waited on by Run() until new tasks are ready to |
| 55 // run or shutdown starts. |
| 56 base::ConditionVariable has_ready_to_run_tasks_cv_; |
| 57 |
| 58 // Condition variable that is waited on by origin threads until a namespace |
| 59 // has finished running all associated tasks. |
| 60 base::ConditionVariable has_namespaces_with_finished_running_tasks_cv_; |
| 61 |
| 62 // Set during shutdown. Tells Run() to return when no more tasks are pending. |
| 63 bool shutdown_; |
| 64 }; |
| 65 |
| 66 } // namespace cc |
| 67 |
| 68 #endif // CC_RASTER_SINGLE_THREAD_TASK_GRAPH_RUNNER_H_ |
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