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