TaskManager.h revision 5dc7fa709646799a5207a5d217f70aa02bf4a3aa 
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
27namespace android {
28namespace uirenderer {
29
30template <typename T>
31class Task;
32class TaskBase;
33
34template <typename T>
35class TaskProcessor;
36class TaskProcessorBase;
37
38class TaskManager {
39public:
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     * true on a single CPU core device.
47     */
48    bool canRunTasks() const;
49
50private:
51    template <typename T>
52    friend class TaskProcessor;
53
54    template<typename T>
55    bool addTask(const sp<Task<T> >& task, const sp<TaskProcessor<T> >& processor) {
56        return addTaskBase(sp<TaskBase>(task), sp<TaskProcessorBase>(processor));
57    }
58
59    bool addTaskBase(const sp<TaskBase>& task, const sp<TaskProcessorBase>& processor);
60
61    struct TaskWrapper {
62        TaskWrapper(): mTask(), mProcessor() { }
63
64        TaskWrapper(const sp<TaskBase>& task, const sp<TaskProcessorBase>& processor):
65            mTask(task), mProcessor(processor) {
66        }
67
68        sp<TaskBase> mTask;
69        sp<TaskProcessorBase> mProcessor;
70    };
71
72    class WorkerThread: public Thread {
73    public:
74        WorkerThread(const String8 name): mSignal(Condition::WAKE_UP_ONE), mName(name) { }
75
76        bool addTask(TaskWrapper task);
77        size_t getTaskCount() const;
78        void exit();
79
80    private:
81        virtual bool threadLoop();
82
83        // Lock for the list of tasks
84        mutable Mutex mLock;
85        Vector<TaskWrapper> mTasks;
86
87        // Signal used to wake up the thread when a new
88        // task is available in the list
89        mutable Signal mSignal;
90
91        const String8 mName;
92    };
93
94    Vector<sp<WorkerThread> > mThreads;
95};
96
97}; // namespace uirenderer
98}; // namespace android
99
100#endif // ANDROID_HWUI_TASK_MANAGER_H
101