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    explicit Barrier(Condition::WakeUpType type = Condition::WAKE_UP_ALL)
28            : mType(type), mOpened(false) {}
29    ~Barrier() {}
30
31    void open() {
32        Mutex::Autolock l(mLock);
33        mOpened = true;
34        mCondition.signal(mType);
35    }
36
37    void wait() const {
38        Mutex::Autolock l(mLock);
39        while (!mOpened) {
40            mCondition.wait(mLock);
41        }
42    }
43
44private:
45    Condition::WakeUpType mType;
46    volatile bool mOpened;
47    mutable Mutex mLock;
48    mutable Condition mCondition;
49};
50
51};  // namespace uirenderer
52};  // namespace android
53
54#endif  // ANDROID_HWUI_BARRIER_H
55