1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not 5 * use this file except in compliance with the License. You may obtain a copy of 6 * 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, WITHOUT 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 13 * License for the specific language governing permissions and limitations under 14 * the License. 15 */ 16 17 18 #ifndef CTSAUDIO_SEMAPHORE_H 19 #define CTSAUDIO_SEMAPHORE_H 20 21 #include <semaphore.h> 22 23 #include <Log.h> 24 25 /** 26 * Simple semaphore interface for synchronization between client and server 27 */ 28 class Semaphore { 29 public: 30 explicit Semaphore(int count = 0); 31 32 ~Semaphore(); 33 34 /// down semaphore if it is already positive. 35 void tryWait(); 36 37 bool wait(); 38 39 bool timedWait(int timeInMSec); 40 41 void post(); 42 43 private: 44 sem_t mSem; 45 }; 46 47 48 #endif // CTSAUDIO_SEMAPHORE_H 49