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 
22 namespace android {
23 namespace uirenderer {
24 
25 class Barrier {
26 public:
27     explicit Barrier(Condition::WakeUpType type = Condition::WAKE_UP_ALL)
mType(type)28             : mType(type), mOpened(false) {}
~Barrier()29     ~Barrier() {}
30 
open()31     void open() {
32         Mutex::Autolock l(mLock);
33         mOpened = true;
34         mCondition.signal(mType);
35     }
36 
wait()37     void wait() const {
38         Mutex::Autolock l(mLock);
39         while (!mOpened) {
40             mCondition.wait(mLock);
41         }
42     }
43 
44 private:
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