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      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:
     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 
     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