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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 
     24 #include "Signal.h"
     25 
     26 #include <vector>
     27 
     28 namespace android {
     29 namespace uirenderer {
     30 
     31 template <typename T>
     32 class Task;
     33 class TaskBase;
     34 
     35 template <typename T>
     36 class TaskProcessor;
     37 class TaskProcessorBase;
     38 
     39 class TaskManager {
     40 public:
     41     TaskManager();
     42     ~TaskManager();
     43 
     44     /**
     45      * Returns true if this task  manager can run tasks,
     46      * false otherwise. This method will typically return
     47      * false on a single CPU core device.
     48      */
     49     bool canRunTasks() const;
     50 
     51     /**
     52      * Stops all allocated threads. Adding tasks will start
     53      * the threads again as necessary.
     54      */
     55     void stop();
     56 
     57 private:
     58     template <typename T>
     59     friend class TaskProcessor;
     60 
     61     template<typename T>
     62     bool addTask(const sp<Task<T> >& task, const sp<TaskProcessor<T> >& processor) {
     63         return addTaskBase(sp<TaskBase>(task), sp<TaskProcessorBase>(processor));
     64     }
     65 
     66     bool addTaskBase(const sp<TaskBase>& task, const sp<TaskProcessorBase>& processor);
     67 
     68     struct TaskWrapper {
     69         TaskWrapper(): mTask(), mProcessor() { }
     70 
     71         TaskWrapper(const sp<TaskBase>& task, const sp<TaskProcessorBase>& processor):
     72             mTask(task), mProcessor(processor) {
     73         }
     74 
     75         sp<TaskBase> mTask;
     76         sp<TaskProcessorBase> mProcessor;
     77     };
     78 
     79     class WorkerThread: public Thread {
     80     public:
     81         explicit WorkerThread(const String8& name): mSignal(Condition::WAKE_UP_ONE), mName(name) { }
     82 
     83         bool addTask(const TaskWrapper& task);
     84         size_t getTaskCount() const;
     85         void exit();
     86 
     87     private:
     88         virtual status_t readyToRun() override;
     89         virtual bool threadLoop() override;
     90 
     91         // Lock for the list of tasks
     92         mutable Mutex mLock;
     93         std::vector<TaskWrapper> mTasks;
     94 
     95         // Signal used to wake up the thread when a new
     96         // task is available in the list
     97         mutable Signal mSignal;
     98 
     99         const String8 mName;
    100     };
    101 
    102     std::vector<sp<WorkerThread> > mThreads;
    103 };
    104 
    105 }; // namespace uirenderer
    106 }; // namespace android
    107 
    108 #endif // ANDROID_HWUI_TASK_MANAGER_H
    109