1 /*
2  * Copyright (c) 2024 the ThorVG project. All rights reserved.
3 
4  * Permission is hereby granted, free of charge, to any person obtaining a copy
5  * of this software and associated documentation files (the "Software"), to deal
6  * in the Software without restriction, including without limitation the rights
7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8  * copies of the Software, and to permit persons to whom the Software is
9  * furnished to do so, subject to the following conditions:
10 
11  * The above copyright notice and this permission notice shall be included in all
12  * copies or substantial portions of the Software.
13 
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20  * SOFTWARE.
21  */
22 
23 #include "../../lv_conf_internal.h"
24 #if LV_USE_THORVG_INTERNAL
25 
26 #ifndef _TVG_LOCK_H_
27 #define _TVG_LOCK_H_
28 
29 #ifdef THORVG_THREAD_SUPPORT
30 
31 #include <mutex>
32 #include "tvgTaskScheduler.h"
33 
34 namespace tvg {
35 
36     struct Key
37     {
38         std::mutex mtx;
39     };
40 
41     struct ScopedLock
42     {
43         Key* key = nullptr;
44 
ScopedLockScopedLock45         ScopedLock(Key& k)
46         {
47             if (TaskScheduler::threads() > 0) {
48                 k.mtx.lock();
49                 key = &k;
50             }
51         }
52 
~ScopedLockScopedLock53         ~ScopedLock()
54         {
55             if (TaskScheduler::threads() > 0) {
56                 key->mtx.unlock();
57             }
58         }
59     };
60 
61 }
62 
63 #else //THORVG_THREAD_SUPPORT
64 
65 namespace tvg {
66 
67     struct Key {};
68 
69     struct ScopedLock
70     {
ScopedLockScopedLock71         ScopedLock(Key& key) {}
72     };
73 
74 }
75 
76 #endif //THORVG_THREAD_SUPPORT
77 
78 #endif //_TVG_LOCK_H_
79 
80 
81 #endif /* LV_USE_THORVG_INTERNAL */
82 
83