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 #ifndef ANDROID
23 #include "RgaMutex.h"
24 
25 #if defined(__clang__)
26 #pragma clang diagnostic push
27 #pragma clang diagnostic ignored "-Wundefined-var-template"
28 #endif
29 
30 template <typename TYPE>
31 class Singleton {
32   public:
getInstance()33     static TYPE& getInstance() {
34         Mutex::Autolock _l(sLock);
35         TYPE* instance = sInstance;
36         if (instance == nullptr) {
37             instance = new TYPE();
38             sInstance = instance;
39         }
40         return *instance;
41     }
42 
hasInstance()43     static bool hasInstance() {
44         Mutex::Autolock _l(sLock);
45         return sInstance != nullptr;
46     }
47 
48   protected:
~Singleton()49     ~Singleton() { }
Singleton()50     Singleton() { }
51 
52   private:
53     Singleton(const Singleton&);
54     Singleton& operator = (const Singleton&);
55     static Mutex sLock;
56     static TYPE* sInstance;
57 };
58 
59 #if defined(__clang__)
60 #pragma clang diagnostic pop
61 #endif
62 
63 #define RGA_SINGLETON_STATIC_INSTANCE(TYPE)                 \
64     template<> ::Mutex  \
65         (::Singleton< TYPE >::sLock)(::Mutex::PRIVATE);  \
66     template<> TYPE* ::Singleton< TYPE >::sInstance(nullptr);  /* NOLINT */ \
67     template class ::Singleton< TYPE >;
68 
69 #endif //ANDROID
70 #endif //_LIBS_RGA_SINGLETON_H
71