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