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PlatformMutex.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2006-2019 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 PLATFORM_MUTEX_H
18 #define PLATFORM_MUTEX_H
19 
20 #include "platform/NonCopyable.h"
21 
22 /** \addtogroup platform-public-api */
23 /** @{*/
24 
25 /** \defgroup platform_PlatformMutex PlatformMutex class
26  * @{
27  */
28 
29 /** The PlatformMutex class is used to synchronize the execution of threads.
30  *
31  * Mbed drivers use the PlatformMutex class instead of rtos::Mutex.
32  * This enables the use of drivers when the Mbed OS is compiled without the RTOS.
33  *
34  * @note
35  * - When the RTOS is present, the PlatformMutex becomes a typedef for rtos::Mutex.
36  * - When the RTOS is absent, all methods are defined as noop.
37  */
38 
39 #ifdef MBED_CONF_RTOS_API_PRESENT
40 
41 // rtos::Mutex is itself a dummy class if the RTOS API is present, but not the RTOS
42 #include "rtos/Mutex.h"
43 typedef rtos::Mutex PlatformMutex;
44 
45 #else
46 
47 class PlatformMutex: private mbed::NonCopyable<PlatformMutex> {
48 public:
49  /** Create a PlatformMutex object.
50  *
51  * @note When the RTOS is present, this is an alias for rtos::Mutex::Mutex().
52  */
53  PlatformMutex()
54  {
55  }
56 
57  /** PlatformMutex destructor.
58  *
59  * @note When the RTOS is present, this is an alias for rtos::Mutex::~Mutex().
60  */
61  ~PlatformMutex()
62  {
63  }
64 
65  /** Wait until a PlatformMutex becomes available.
66  *
67  * @note
68  * - When the RTOS is present, this is an alias for rtos::Mutex::lock().
69  * - When the RTOS is absent, this is a noop.
70  */
71  void lock()
72  {
73  }
74 
75  /** Unlock a PlatformMutex that the same thread has previously locked.
76  *
77  * @note
78  * - When the RTOS is present, this is an alias for rtos::Mutex::unlock().
79  * - When the RTOS is absent, this is a noop.
80  */
81  void unlock()
82  {
83  }
84 };
85 
86 #endif
87 
88 #endif
89 
90 /**@}*/
91 
92 /**@}*/
PlatformMutex::~PlatformMutex
~PlatformMutex()
PlatformMutex destructor.
Definition: PlatformMutex.h:61
mbed::NonCopyable
Prevents generation of copy constructor and copy assignment operator in derived classes.
Definition: NonCopyable.h:169
PlatformMutex
The PlatformMutex class is used to synchronize the execution of threads.
Definition: PlatformMutex.h:47
rtos::Mutex
The Mutex class is used to synchronize the execution of threads.
Definition: Mutex.h:68
PlatformMutex::unlock
void unlock()
Unlock a PlatformMutex that the same thread has previously locked.
Definition: PlatformMutex.h:81
PlatformMutex::lock
void lock()
Wait until a PlatformMutex becomes available.
Definition: PlatformMutex.h:71
PlatformMutex::PlatformMutex
PlatformMutex()
Create a PlatformMutex object.
Definition: PlatformMutex.h:53
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