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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)
     30             : mType(type), mSignaled(false) {}
     31     ~Signal() {}
     32 
     33     void signal() {
     34         {
     35             Mutex::Autolock l(mLock);
     36             mSignaled = true;
     37         }
     38         mCondition.signal(mType);
     39     }
     40 
     41     void wait() {
     42         Mutex::Autolock l(mLock);
     43         while (!mSignaled) {
     44             mCondition.wait(mLock);
     45         }
     46         mSignaled = false;
     47     }
     48 
     49 private:
     50     Condition::WakeUpType mType;
     51     volatile bool mSignaled;
     52     mutable Mutex mLock;
     53     mutable Condition mCondition;
     54 };
     55 
     56 };  // namespace uirenderer
     57 };  // namespace android
     58 
     59 #endif  // ANDROID_HWUI_SIGNAL_H
     60