RenderThread.cpp revision cec24ae16e9a0a7c3075f1a8d9149bb7fb3813fc 
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#define LOG_TAG "RenderThread"
18
19#include "RenderThread.h"
20
21#include <utils/Log.h>
22
23namespace android {
24using namespace uirenderer::renderthread;
25ANDROID_SINGLETON_STATIC_INSTANCE(RenderThread);
26
27namespace uirenderer {
28namespace renderthread {
29
30RenderThread::RenderThread() : Thread(true), Singleton<RenderThread>()
31        , mQueueHead(0), mQueueTail(0) {
32    mLooper = new Looper(false);
33    run("RenderThread");
34}
35
36RenderThread::~RenderThread() {
37}
38
39bool RenderThread::threadLoop() {
40    for (;;) {
41        int result = mLooper->pollAll(-1);
42        if (result == ALOOPER_POLL_ERROR) {
43            // TODO Something?
44            break;
45        }
46        // Process our queue, if we have anything
47        while (RenderTask* task = nextTask()) {
48            task->run();
49            delete task;
50        }
51    }
52
53    return false;
54}
55
56void RenderThread::queue(RenderTask* task) {
57    AutoMutex _lock(mLock);
58    if (mQueueTail) {
59        mQueueTail->mNext = task;
60    } else {
61        mQueueHead = task;
62    }
63    mQueueTail = task;
64    if (mQueueHead == task) {
65        // Only wake if this is the first task
66        mLooper->wake();
67    }
68}
69
70RenderTask* RenderThread::nextTask() {
71    AutoMutex _lock(mLock);
72    RenderTask* ret = mQueueHead;
73    if (ret) {
74        if (mQueueTail == mQueueHead) {
75            mQueueTail = mQueueHead = 0;
76        } else {
77            mQueueHead = ret->mNext;
78        }
79        ret->mNext = 0;
80    }
81    return ret;
82}
83
84} /* namespace renderthread */
85} /* namespace uirenderer */
86} /* namespace android */
87