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