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_BARRIER_H
18#define ANDROID_HWUI_BARRIER_H
19
20#include <utils/Condition.h>
21
22namespace android {
23namespace uirenderer {
24
25class Barrier {
26public:
27    Barrier(Condition::WakeUpType type = Condition::WAKE_UP_ALL) : mType(type), mOpened(false) { }
28    ~Barrier() { }
29
30    void open() {
31        Mutex::Autolock l(mLock);
32        mOpened = true;
33        mCondition.signal(mType);
34    }
35
36    void close() {
37        Mutex::Autolock l(mLock);
38        mOpened = false;
39    }
40
41    void wait() const {
42        Mutex::Autolock l(mLock);
43        while (!mOpened) {
44            mCondition.wait(mLock);
45        }
46    }
47
48private:
49    Condition::WakeUpType mType;
50    volatile bool mOpened;
51    mutable Mutex mLock;
52    mutable Condition mCondition;
53};
54
55}; // namespace uirenderer
56}; // namespace android
57
58#endif // ANDROID_HWUI_BARRIER_H
59