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
24namespace android {
25namespace uirenderer {
26
27class Signal {
28public:
29    explicit Signal(Condition::WakeUpType type = Condition::WAKE_UP_ALL) : mType(type), mSignaled(false) { }
30    ~Signal() { }
31
32    void signal() {
33        {
34            Mutex::Autolock l(mLock);
35            mSignaled = true;
36        }
37        mCondition.signal(mType);
38    }
39
40    void wait() {
41        Mutex::Autolock l(mLock);
42        while (!mSignaled) {
43            mCondition.wait(mLock);
44        }
45        mSignaled = false;
46    }
47
48private:
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