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ScopedLock.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2018-2019 ARM Limited
3  * SPDX-License-Identifier: Apache-2.0
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 #ifndef MBED_SCOPEDLOCK_H
18 #define MBED_SCOPEDLOCK_H
19 
20 #include "platform/NonCopyable.h"
21 
22 namespace mbed {
23 
24 /** \addtogroup platform-public-api */
25 /** @{*/
26 
27 /**
28  * \defgroup platform_ScopedLock ScopedLock functions
29  * @{
30  */
31 
32 /** RAII-style mechanism for owning a lock of Lockable object for the duration of a scoped block
33  *
34  * @tparam Lockable The type implementing BasicLockable concept
35  *
36  * @note For type Lockable to be BasicLockable, the following conditions have to be satisfied:
37  * - has public member function @a lock which blocks until a lock can be obtained for the current execution context
38  * - has public member function @a unlock which releases the lock
39  *
40  * Usage:
41  *
42  * Example with rtos::Mutex
43  *
44  * @code
45  * void foo(Mutex &m) {
46  * ScopedLock<Mutex> lock(m);
47  * // Mutex lock protects code in this block
48  * }
49  * @endcode
50  *
51  *
52  * More generic example
53  *
54  * @code
55  * template<typename Lockable>
56  * void foo(Lockable& lockable) {
57  * ScopedLock<Lockable> lock(lockable);
58  * // Code in this block runs under lock
59  * }
60  * @endcode
61  */
62 template <typename Lockable>
63 class ScopedLock : private NonCopyable<ScopedLock<Lockable> > {
64 public:
65  /** Locks given lockable object
66  *
67  * @param lockable reference to the instance of Lockable object
68  * @note lockable object should outlive the ScopedLock object
69  */
70  ScopedLock(Lockable &lockable): _lockable(lockable)
71  {
72  _lockable.lock();
73  }
74 
75  ~ScopedLock()
76  {
77  _lockable.unlock();
78  }
79 private:
80  Lockable &_lockable;
81 };
82 
83 /**@}*/
84 
85 /**@}*/
86 
87 } // embed
88 
89 #endif // MBED_SCOPEDLOCK_H
RAII-style mechanism for owning a lock of Lockable object for the duration of a scoped block...
Definition: ScopedLock.h:63
Prevents generation of copy constructor and copy assignment operator in derived classes.
Definition: NonCopyable.h:169
ScopedLock(Lockable &lockable)
Locks given lockable object.
Definition: ScopedLock.h:70
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