source: flair-src/trunk/lib/FlairCore/src/Thread.h@ 2

Last change on this file since 2 was 2, checked in by Sanahuja Guillaume, 8 years ago

flaircore
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1// %flair:license{
2// This file is part of the Flair framework distributed under the
3// CECILL-C License, Version 1.0.
4// %flair:license}
5/*!
6 * \file Thread.h
7 * \brief Abstract class for a thread
8 * \author Guillaume Sanahuja, Copyright Heudiasyc UMR UTC/CNRS 7253
9 * \date 2012/10/04
10 * \version 4.0
11 */
12
13#ifndef THREAD_H
14#define THREAD_H
15
16#include <Object.h>
17#include <stdint.h>
18
19class Thread_impl;
20
21namespace flair
22{
23namespace core
24{
25
26 class IODevice;
27
28 /*! \class Thread
29 *
30 * \brief Abstract class for a thread
31 *
32 * To implement a thread, Run() method must be reimplemented. \n
33 * When Start() is called, it will automatically call Run() reimplemented method.
34 * A thread can be periodic, in this case WaitPeriod() will block untill period is met.
35 * Thread can also e synnchronized with an IODevice, using WaitUpdate() method. \n
36 * Thread period is by default 100ms.
37 */
38 class Thread: public Object
39 {
40 friend class ::Thread_impl;
41
42 public:
43 /*!
44 * \brief Constructor
45 *
46 * \param parent parent
47 * \param name name
48 * \param priority priority, should be >20 (<20 is reserved for internal use)
49 */
50 Thread(const Object* parent,std::string name,uint8_t priority);//priority>20, for real time only
51
52 /*!
53 * \brief Destructor
54 *
55 * If thread is started, SafeStop() and Join() will
56 * be automatically called.
57 *
58 */
59 virtual ~Thread();
60
61 /*!
62 * \brief Start the thread
63 *
64 */
65 void Start(void);
66
67 /*!
68 * \brief Set a stop flag
69 *
70 * ToBeStopped() will return true after calling this method.
71 */
72 void SafeStop(void);
73
74 /*!
75 * \brief Set a stop flag
76 *
77 * Reimplemented Run() can poll this method to
78 * determine when to stop the thread.
79 *
80 * \return true if SafeStop() was called
81 */
82 bool ToBeStopped(void) const;
83
84 /*!
85 * \brief Join the thread
86 *
87 * This method will block untill Run() returns.
88 *
89 */
90 void Join(void);
91
92 /*!
93 * \brief Set the period in micro second
94 *
95 * After calling this method, IsPeriodSet will return true.
96 *
97 * \param period_us period in us
98 */
99 void SetPeriodUS(uint32_t period_us);
100
101 uint32_t GetPeriodUS() const;
102
103 /*!
104 * \brief Set the period in milli second
105 *
106 * After calling this method, IsPeriodSet will return true.
107 *
108 * \param period_ums period in ms
109 */
110 void SetPeriodMS(uint32_t period_ms);
111
112 uint32_t GetPeriodMS() const;
113
114 /*!
115 * \brief Returns if period was set
116 *
117 * \return true if a period was set using SetPeriodUS or SetPeriodMS
118 * false otherwise
119 */
120 bool IsPeriodSet(void);
121
122 /*!
123 * \brief Wait the period
124 *
125 * This method will block untill period is met. \n
126 * If no period was set (see SetPeriodUS, SetPeriodMS and IsPeriodSet), this method
127 * returns immediately.
128 *
129 */
130 void WaitPeriod(void) const;
131
132 /*!
133 * \brief Wait update of an IODevice
134 *
135 * This method will block untill IODevice::ProcessUpdate
136 * is called. \n
137 * This method is usefull to synchronize a thread with an IODevice.
138 *
139 * \param device IODevice to wait update from
140 */
141 int WaitUpdate(const IODevice* device);
142
143 /*!
144 * \brief Suspend the thread
145 *
146 * This method will block untill Resume() is called.
147 *
148 */
149 void Suspend(void);
150
151 /*!
152 * \brief Suspend the thread with timeout
153 *
154 * This method will block until Resume() is called or the absolute date specified occurs
155 *
156 * \param date absolute date in ns
157 * \return true if thread is woken up by a call to Resume, false otherwise
158 */
159 bool SuspendUntil(Time date);
160
161 /*!
162 * \brief Resume the thread
163 *
164 * This method will unblock the call to Suspend().
165 *
166 */
167 void Resume(void);
168
169 /*!
170 * \brief Is the thread suspended?
171 *
172 * \return true if thread is suspended
173 *
174 */
175 bool IsSuspended(void) const;
176
177 /*!
178 * \brief Sleep until absolute time
179 *
180 * This method will block untill time is reached.
181 *
182 * \param time absolute time
183 */
184 void SleepUntil(Time time) const;
185
186 /*!
187 * \brief Sleep for a certain time in micro second
188 *
189 * This method will block untill time is elapsed.
190 *
191 * \param time_us time to wait in micro second
192 */
193 void SleepUS(uint32_t time_us) const;
194
195 /*!
196 * \brief Sleep for a cartain time in milli second
197 *
198 * This method will block untill time is elapsed.
199 *
200 * \param time_ms time to wait in milli second
201 */
202 void SleepMS(uint32_t time_ms) const;
203
204 /*!
205 * \brief Warn if real time / non real time switches occur
206 *
207 * If enabled, a message with the call stack will be displayed
208 * in case of real time / non real time switches. \n
209 * This method can help to debug application and see if switches occur. \n
210 * Note that it as no effect if this method is called from the non real time
211 * Framework library.
212 *
213 * \param enable enable or disable warns
214 */
215 static void WarnUponSwitches(bool enable);
216
217 private:
218 /*!
219 * \brief Run method
220 *
221 * This method is automatically called by Start(). \n
222 * This method must be reimplemented, in order to implement the thread.
223 *
224 */
225 virtual void Run(void)=0;
226
227 class Thread_impl* pimpl_;
228 };
229
230} // end namespace core
231} // end namespace flair
232
233#endif // THREAD_H
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