1 /*
2  * Copyright (C) 2016 Rockchip Electronics Co., Ltd.
3  * Authors:
4  *    Zhiqin Wei <wzq@rock-chips.com>
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  *      http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 
19 #ifndef _LIBS_RGA_SINGLETON_H
20 #define _LIBS_RGA_SINGLETON_H
21 
22 #include "RgaMutex.h"
23 
24 #if defined(__clang__)
25 #pragma clang diagnostic push
26 #pragma clang diagnostic ignored "-Wundefined-var-template"
27 #endif
28 
29 template <typename TYPE> class RgaSingleton {
30 public:
getInstance()31     static TYPE& getInstance()
32     {
33         RgaMutex::Autolock _l(sLock);
34         TYPE *instance = sInstance;
35         if (instance == nullptr) {
36             instance = new TYPE();
37             sInstance = instance;
38         }
39         return *instance;
40     }
hasInstance()41     static bool hasInstance()
42     {
43         RgaMutex::Autolock _l(sLock);
44         return sInstance != nullptr;
45     }
46 
47 protected:
~RgaSingleton()48     ~RgaSingleton()
49     {
50     }
RgaSingleton()51     RgaSingleton()
52     {
53     }
54 
55 private:
56     RgaSingleton(const RgaSingleton &);
57     RgaSingleton &operator=(const RgaSingleton &);
58     static RgaMutex sLock;
59     static TYPE *sInstance;
60 };
61 
62 #if defined(__clang__)
63 #pragma clang diagnostic pop
64 #endif
65 
66 #define RGA_SINGLETON_STATIC_INSTANCE(TYPE)                                                                            \
67     do {                                                                                                               \
68         template <>::RgaMutex(::RgaSingleton<TYPE>::sLock)(::RgaMutex::PRIVATE);                                       \
69         template <> TYPE * ::RgaSingleton<TYPE>::sInstance(nullptr); /* NOLINT */                                      \
70         template class ::RgaSingleton<TYPE>;                                                                           \
71     } while (0)
72 
73 #endif // _LIBS_RGA_SINGLETON_H
74