aboutsummaryrefslogtreecommitdiffstats
path: root/os/rt/include/chevents.h
blob: db5c3ded59e70ad88638a2f394cffbfd5c72f9d9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
/*
    ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio.

    This file is part of ChibiOS.

    ChibiOS is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
/*
   Concepts and parts of this file have been contributed by Scott (skute).
 */

/**
 * @file    chevents.h
 * @brief   Events macros and structures.
 *
 * @addtogroup events
 * @{
 */

#ifndef CHEVENTS_H
#define CHEVENTS_H

#if (CH_CFG_USE_EVENTS == TRUE) || defined(__DOXYGEN__)

/*===========================================================================*/
/* Module constants.                                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Module pre-compile time settings.                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Derived constants and error checks.                                       */
/*===========================================================================*/

/*===========================================================================*/
/* Module data structures and types.                                         */
/*===========================================================================*/

typedef struct event_listener event_listener_t;

/**
 * @brief   Event Listener structure.
 */
struct event_listener {
  event_listener_t      *next;          /**< @brief Next Event Listener
                                                    registered on the event
                                                    source.                 */
  thread_t              *listener;      /**< @brief Thread interested in the
                                                    event source.           */
  eventmask_t           events;         /**< @brief Events to be set in
                                                    the listening thread.   */
  eventflags_t          flags;          /**< @brief Flags added to the listener
                                                    by the event source.    */
  eventflags_t          wflags;         /**< @brief Flags that this listener
                                                    interested in.          */
};

/**
 * @brief   Event Source structure.
 */
typedef struct event_source {
  event_listener_t      *next;          /**< @brief First Event Listener
                                                    registered on the Event
                                                    Source.                 */
} event_source_t;

/**
 * @brief   Event Handler callback function.
 */
typedef void (*evhandler_t)(eventid_t id);

/*===========================================================================*/
/* Module macros.                                                            */
/*===========================================================================*/

/**
 * @brief   All events allowed mask.
 */
#define ALL_EVENTS      ((eventmask_t)-1)

/**
 * @brief   Returns an event mask from an event identifier.
 */
#define EVENT_MASK(eid) ((eventmask_t)1 << (eventmask_t)(eid))

/**
 * @brief   Data part of a static event source initializer.
 * @details This macro should be used when statically initializing an event
 *          source that is part of a bigger structure.
 * @param name the name of the event source variable
 */
#define _EVENTSOURCE_DATA(name) {(void *)(&name)}

/**
 * @brief   Static event source initializer.
 * @details Statically initialized event sources require no explicit
 *          initialization using @p chEvtInit().
 *
 * @param name          the name of the event source variable
 */
#define EVENTSOURCE_DECL(name) event_source_t name = _EVENTSOURCE_DATA(name)

/*===========================================================================*/
/* External declarations.                                                    */
/*===========================================================================*/

#ifdef __cplusplus
extern "C" {
#endif
  void chEvtRegisterMaskWithFlags(event_source_t *esp,
                                  event_listener_t *elp,
                                  eventmask_t events,
                                  eventflags_t wflags);
  void chEvtUnregister(event_source_t *esp, event_listener_t *elp);
  eventmask_t chEvtGetAndClearEvents(eventmask_t events);
  eventmask_t chEvtAddEvents(eventmask_t events);
  eventflags_t chEvtGetAndClearFlags(event_listener_t *elp);
  eventflags_t chEvtGetAndClearFlagsI(event_listener_t *elp);
  void chEvtSignal(thread_t *tp, eventmask_t events);
  void chEvtSignalI(thread_t *tp, eventmask_t events);
  void chEvtBroadcastFlags(event_source_t *esp, eventflags_t flags);
  void chEvtBroadcastFlagsI(event_source_t *esp, eventflags_t flags);
  void chEvtDispatch(const evhandler_t *handlers, eventmask_t events);
#if (CH_CFG_OPTIMIZE_SPEED == TRUE) || (CH_CFG_USE_EVENTS_TIMEOUT == FALSE)
  eventmask_t chEvtWaitOne(eventmask_t events);
  eventmask_t chEvtWaitAny(eventmask_t events);
  eventmask_t chEvtWaitAll(eventmask_t events);
#endif
#if CH_CFG_USE_EVENTS_TIMEOUT == TRUE
  eventmask_t chEvtWaitOneTimeout(eventmask_t events, systime_t time);
  eventmask_t chEvtWaitAnyTimeout(eventmask_t events, systime_t time);
  eventmask_t chEvtWaitAllTimeout(eventmask_t events, systime_t time);
#endif
#ifdef __cplusplus
}
#endif

#if (CH_CFG_OPTIMIZE_SPEED == FALSE) && (CH_CFG_USE_EVENTS_TIMEOUT == TRUE)
#define chEvtWaitOne(mask) chEvtWaitOneTimeout(mask, TIME_INFINITE)
#define chEvtWaitAny(mask) chEvtWaitAnyTimeout(mask, TIME_INFINITE)
#define chEvtWaitAll(mask) chEvtWaitAllTimeout(mask, TIME_INFINITE)
#endif

/*===========================================================================*/
/* Module inline functions.                                                  */
/*===========================================================================*/

/**
 * @brief   Initializes an Event Source.
 * @note    This function can be invoked before the kernel is initialized
 *          because it just prepares a @p event_source_t structure.
 *
 * @param[in] esp       pointer to the @p event_source_t structure
 *
 * @init
 */
static inline void chEvtObjectInit(event_source_t *esp) {

  esp->next = (event_listener_t *)esp;
}

/**
 * @brief     Registers an Event Listener on an Event Source.
 * @details Once a thread has registered as listener on an event source it
 *             will be notified of all events broadcasted there.
 * @note     Multiple Event Listeners can specify the same bits to be ORed to
 *             different threads.
 *
 * @param[in] esp       pointer to the @p event_source_t structure
 * @param[out] elp      pointer to the @p event_listener_t structure
 * @param[in] events    the mask of events to be ORed to the thread when
 *                      the event source is broadcasted
 *
 * @api
 */
static inline void chEvtRegisterMask(event_source_t *esp,
                                     event_listener_t *elp,
                                     eventmask_t events) {

  chEvtRegisterMaskWithFlags(esp, elp, events, (eventflags_t)-1);
}

/**
 * @brief   Registers an Event Listener on an Event Source.
 * @note    Multiple Event Listeners can use the same event identifier, the
 *          listener will share the callback function.
 *
 * @param[in] esp       pointer to the  @p event_source_t structure
 * @param[out] elp      pointer to the @p event_listener_t structure
 * @param[in] event     numeric identifier assigned to the Event Listener.
 *                      The value must range between zero and the size, in bit,
 *                      of the @p eventmask_t type minus one.
 *
 * @api
 */
static inline void chEvtRegister(event_source_t *esp,
                                 event_listener_t *elp,
                                 eventid_t event) {

  chEvtRegisterMask(esp, elp, EVENT_MASK(event));
}

/**
 * @brief   Verifies if there is at least one @p event_listener_t registered.
 *
 * @param[in] esp       pointer to the @p event_source_t structure
 * @return              The event source status.
 *
 * @iclass
 */
static inline bool chEvtIsListeningI(event_source_t *esp) {

  return (bool)(esp != (event_source_t *)esp->next);
}

/**
 * @brief   Signals all the Event Listeners registered on the specified Event
 *          Source.
 *
 * @param[in] esp       pointer to the @p event_source_t structure
 *
 * @api
 */
static inline void chEvtBroadcast(event_source_t *esp) {

  chEvtBroadcastFlags(esp, (eventflags_t)0);
}

/**
 * @brief   Signals all the Event Listeners registered on the specified Event
 *          Source.
 * @post    This function does not reschedule so a call to a rescheduling
 *          function must be performed before unlocking the kernel. Note that
 *          interrupt handlers always reschedule on exit so an explicit
 *          reschedule must not be performed in ISRs.
 *
 * @param[in] esp       pointer to the @p event_source_t structure
 *
 * @iclass
 */
static inline void chEvtBroadcastI(event_source_t *esp) {

  chEvtBroadcastFlagsI(esp, (eventflags_t)0);
}

/**
 * @brief   Returns the events mask.
 * @details The pending events mask is returned but not altered in any way.
 *
 * @return              The pending events mask.
 *
 * @api
 */
static inline eventmask_t chEvtGetEventsX(void) {

  return currp->epending;
}

#endif /* CH_CFG_USE_EVENTS == TRUE */

#endif /* CHEVENTS_H */

/** @} */