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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_HWUI_TASK_MANAGER_H
     18 #define ANDROID_HWUI_TASK_MANAGER_H
     19 
     20 #include <utils/Mutex.h>
     21 #include <utils/String8.h>
     22 #include <utils/Thread.h>
     23 #include <utils/Vector.h>
     24 
     25 #include "Signal.h"
     26 
     27 namespace android {
     28 namespace uirenderer {
     29 
     30 template <typename T>
     31 class Task;
     32 class TaskBase;
     33 
     34 template <typename T>
     35 class TaskProcessor;
     36 class TaskProcessorBase;
     37 
     38 class TaskManager {
     39 public:
     40     TaskManager();
     41     ~TaskManager();
     42 
     43     /**
     44      * Returns true if this task  manager can run tasks,
     45      * false otherwise. This method will typically return
     46      * false on a single CPU core device.
     47      */
     48     bool canRunTasks() const;
     49 
     50     /**
     51      * Stops all allocated threads. Adding tasks will start
     52      * the threads again as necessary.
     53      */
     54     void stop();
     55 
     56 private:
     57     template <typename T>
     58     friend class TaskProcessor;
     59 
     60     template<typename T>
     61     bool addTask(const sp<Task<T> >& task, const sp<TaskProcessor<T> >& processor) {
     62         return addTaskBase(sp<TaskBase>(task), sp<TaskProcessorBase>(processor));
     63     }
     64 
     65     bool addTaskBase(const sp<TaskBase>& task, const sp<TaskProcessorBase>& processor);
     66 
     67     struct TaskWrapper {
     68         TaskWrapper(): mTask(), mProcessor() { }
     69 
     70         TaskWrapper(const sp<TaskBase>& task, const sp<TaskProcessorBase>& processor):
     71             mTask(task), mProcessor(processor) {
     72         }
     73 
     74         sp<TaskBase> mTask;
     75         sp<TaskProcessorBase> mProcessor;
     76     };
     77 
     78     class WorkerThread: public Thread {
     79     public:
     80         WorkerThread(const String8 name): mSignal(Condition::WAKE_UP_ONE), mName(name) { }
     81 
     82         bool addTask(TaskWrapper task);
     83         size_t getTaskCount() const;
     84         void exit();
     85 
     86     private:
     87         virtual status_t readyToRun();
     88         virtual bool threadLoop();
     89 
     90         // Lock for the list of tasks
     91         mutable Mutex mLock;
     92         Vector<TaskWrapper> mTasks;
     93 
     94         // Signal used to wake up the thread when a new
     95         // task is available in the list
     96         mutable Signal mSignal;
     97 
     98         const String8 mName;
     99     };
    100 
    101     Vector<sp<WorkerThread> > mThreads;
    102 };
    103 
    104 }; // namespace uirenderer
    105 }; // namespace android
    106 
    107 #endif // ANDROID_HWUI_TASK_MANAGER_H
    108