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AsyncOp.h
1 /*
2  * Copyright (c) 2018-2019, Arm Limited and affiliates.
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 
18 #ifndef MBED_ASYNC_OP_H
19 #define MBED_ASYNC_OP_H
20 
21 #include "Mutex.h"
22 #include "Semaphore.h"
23 #include "Callback.h"
24 
25 #include "LinkEntry.h"
26 #include "OperationListBase.h"
27 
28 /** \defgroup mbed-os-internal Internal API */
29 
30 /** \addtogroup drivers-internal-api Drivers
31  * \ingroup mbed-os-internal
32  */
33 
34 /** \defgroup drivers-internal-api-usb USB
35  * \ingroup drivers-internal-api
36  */
37 
38 /**
39  * \defgroup drivers_AsyncOp AsyncOp class
40  * \ingroup drivers-internal-api-usb
41  * @{
42  */
43 class AsyncOp: public LinkEntry {
44 public:
45 
46  /**
47  * Construct a new AsyncOp object
48  */
49  AsyncOp();
50 
51  /**
52  * Construct a new AsyncOp object
53  *
54  * @param callback Completion callback
55  */
56  AsyncOp(mbed::Callback<void()> &callback);
57 
58  /**
59  * Cleanup resources used by this AsyncOp
60  */
61  virtual ~AsyncOp();
62 
63  /**
64  * Wait for this asynchronous operation to complete
65  *
66  * If the timeout expires then this asynchronous operation is
67  * aborted and the timeout flag is set.
68  *
69  * @note - the host object's lock MUST NOT be held when this call is made
70  */
71  void wait(rtos::Mutex *host_mutex, rtos::Kernel::Clock::duration_u32 rel_time = rtos::Kernel::wait_for_u32_forever);
72 
73  /**
74  * Abort this asynchronous operation
75  *
76  * This function has no effect if the operation is complete. Otherwise
77  * the aborted flag is set.
78  *
79  * @note - the host object's lock MUST be held when this call is made
80  */
81  void abort();
82 
83  /**
84  * Check if this operation timed out
85  *
86  * @return true if this operation timed out, false otherwise
87  */
88  bool timeout();
89 
90  /**
91  * Check if this operation was aborted
92  *
93  * @return true if this operation was aborted, false otherwise
94  */
95  bool aborted();
96 
97 protected:
98 
99  /**
100  * Callback indicating that something changed
101  *
102  * @return true if finished false if not
103  */
104  virtual bool process() = 0;
105 
106  /**
107  * Callback indicating that this event finished
108  */
109  virtual void complete();
110 
111 private:
112  friend class OperationListBase;
113 
114  mbed::Callback<void()> _callback;
115  OperationListBase *_list;
116  rtos::Semaphore *_wait;
117  bool _aborted;
118  bool _timeout;
119 
120  void _abort(bool timeout);
121 
122  static void _host_lock(rtos::Mutex *host_mutex);
123 
124  static void _host_unlock(rtos::Mutex *host_mutex);
125 };
126 
127 /** @}*/
128 
129 #endif
AsyncOp::process
virtual bool process()=0
Callback indicating that something changed.
AsyncOp::~AsyncOp
virtual ~AsyncOp()
Cleanup resources used by this AsyncOp.
rtos::Semaphore
The Semaphore class is used to manage and protect access to a set of shared resources.
Definition: Semaphore.h:50
AsyncOp::timeout
bool timeout()
Check if this operation timed out.
rtos::Kernel::wait_for_u32_forever
constexpr Clock::duration_u32 wait_for_u32_forever
Magic "wait forever" constant for Kernel::Clock::duration_u32-based APIs.
Definition: Kernel.h:120
AsyncOp::aborted
bool aborted()
Check if this operation was aborted.
mbed::callback
Callback< R(ArgTs...)> callback(R(*func)(ArgTs...)=nullptr) noexcept
Create a callback class with type inferred from the arguments.
Definition: Callback.h:678
AsyncOp::complete
virtual void complete()
Callback indicating that this event finished.
AsyncOp::AsyncOp
AsyncOp()
Construct a new AsyncOp object.
rtos::Mutex
The Mutex class is used to synchronize the execution of threads.
Definition: Mutex.h:70
AsyncOp::abort
void abort()
Abort this asynchronous operation.
LinkEntry
Definition: LinkEntry.h:28
AsyncOp::wait
void wait(rtos::Mutex *host_mutex, rtos::Kernel::Clock::duration_u32 rel_time=rtos::Kernel::wait_for_u32_forever)
Wait for this asynchronous operation to complete.
mbed::Callback
Callback class based on template specialization.
Definition: Callback.h:53
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