1 | /* |
---|
2 | * Event Manager |
---|
3 | * |
---|
4 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
---|
5 | * On-Line Applications Research Corporation (OAR). |
---|
6 | * All rights assigned to U.S. Government, 1994. |
---|
7 | * |
---|
8 | * This material may be reproduced by or for the U.S. Government pursuant |
---|
9 | * to the copyright license under the clause at DFARS 252.227-7013. This |
---|
10 | * notice must appear in all copies of this file and its derivatives. |
---|
11 | * |
---|
12 | * $Id$ |
---|
13 | */ |
---|
14 | |
---|
15 | #include <rtems/system.h> |
---|
16 | #include <rtems/rtems/status.h> |
---|
17 | #include <rtems/rtems/event.h> |
---|
18 | #include <rtems/score/isr.h> |
---|
19 | #include <rtems/score/object.h> |
---|
20 | #include <rtems/rtems/options.h> |
---|
21 | #include <rtems/score/states.h> |
---|
22 | #include <rtems/score/thread.h> |
---|
23 | #include <rtems/rtems/tasks.h> |
---|
24 | |
---|
25 | /*PAGE |
---|
26 | * |
---|
27 | * rtems_event_send |
---|
28 | * |
---|
29 | * This directive allows a thread send an event set to another thread. |
---|
30 | * |
---|
31 | * Input parameters: |
---|
32 | * id - thread id |
---|
33 | * event - event set |
---|
34 | * |
---|
35 | * Output parameters: |
---|
36 | * RTEMS_SUCCESSFUL - if successful |
---|
37 | * error code - if unsuccessful |
---|
38 | */ |
---|
39 | |
---|
40 | rtems_status_code rtems_event_send( |
---|
41 | Objects_Id id, |
---|
42 | rtems_event_set event_in |
---|
43 | ) |
---|
44 | { |
---|
45 | register Thread_Control *the_thread; |
---|
46 | Objects_Locations location; |
---|
47 | RTEMS_API_Control *api; |
---|
48 | |
---|
49 | the_thread = _Thread_Get( id, &location ); |
---|
50 | switch ( location ) { |
---|
51 | case OBJECTS_ERROR: |
---|
52 | return RTEMS_INVALID_ID; |
---|
53 | case OBJECTS_REMOTE: |
---|
54 | return( |
---|
55 | _Event_MP_Send_request_packet( |
---|
56 | EVENT_MP_SEND_REQUEST, |
---|
57 | id, |
---|
58 | event_in |
---|
59 | ) |
---|
60 | ); |
---|
61 | case OBJECTS_LOCAL: |
---|
62 | api = the_thread->API_Extensions[ THREAD_API_RTEMS ]; |
---|
63 | _Event_sets_Post( event_in, &api->pending_events ); |
---|
64 | _Event_Surrender( the_thread ); |
---|
65 | _Thread_Enable_dispatch(); |
---|
66 | return RTEMS_SUCCESSFUL; |
---|
67 | } |
---|
68 | |
---|
69 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ |
---|
70 | } |
---|
71 | |
---|
72 | /*PAGE |
---|
73 | * |
---|
74 | * rtems_event_receive |
---|
75 | * |
---|
76 | * This directive allows a thread to receive a set of events. |
---|
77 | * |
---|
78 | * Input parameters: |
---|
79 | * event_in - input event condition |
---|
80 | * option_set - options |
---|
81 | * ticks - number of ticks to wait (0 means wait forever) |
---|
82 | * event_out - pointer to output event set |
---|
83 | * |
---|
84 | * Output parameters: |
---|
85 | * event out - event set |
---|
86 | * RTEMS_SUCCESSFUL - if successful |
---|
87 | * error code - if unsuccessful |
---|
88 | */ |
---|
89 | |
---|
90 | rtems_status_code rtems_event_receive( |
---|
91 | rtems_event_set event_in, |
---|
92 | rtems_option option_set, |
---|
93 | rtems_interval ticks, |
---|
94 | rtems_event_set *event_out |
---|
95 | ) |
---|
96 | { |
---|
97 | RTEMS_API_Control *api; |
---|
98 | |
---|
99 | api = _Thread_Executing->API_Extensions[ THREAD_API_RTEMS ]; |
---|
100 | |
---|
101 | if ( _Event_sets_Is_empty( event_in ) ) { |
---|
102 | *event_out = api->pending_events; |
---|
103 | return RTEMS_SUCCESSFUL; |
---|
104 | } |
---|
105 | |
---|
106 | _Thread_Disable_dispatch(); |
---|
107 | _Event_Seize( event_in, option_set, ticks, event_out ); |
---|
108 | _Thread_Enable_dispatch(); |
---|
109 | return( _Thread_Executing->Wait.return_code ); |
---|
110 | } |
---|
111 | |
---|
112 | |
---|
113 | /*PAGE |
---|
114 | * |
---|
115 | * _Event_Seize |
---|
116 | * |
---|
117 | * This routine attempts to satisfy the requested event condition |
---|
118 | * for the running thread. |
---|
119 | * |
---|
120 | * Input parameters: |
---|
121 | * event_in - the event condition to satisfy |
---|
122 | * option_set - acquire event options |
---|
123 | * ticks - interval to wait |
---|
124 | * event_out - pointer to event set output area |
---|
125 | * |
---|
126 | * Output parameters: NONE |
---|
127 | * *event_out - event set output area filled in |
---|
128 | * |
---|
129 | * INTERRUPT LATENCY: |
---|
130 | * available |
---|
131 | * wait |
---|
132 | * check sync |
---|
133 | */ |
---|
134 | |
---|
135 | void _Event_Seize( |
---|
136 | rtems_event_set event_in, |
---|
137 | rtems_option option_set, |
---|
138 | rtems_interval ticks, |
---|
139 | rtems_event_set *event_out |
---|
140 | ) |
---|
141 | { |
---|
142 | Thread_Control *executing; |
---|
143 | rtems_event_set seized_events; |
---|
144 | rtems_event_set pending_events; |
---|
145 | ISR_Level level; |
---|
146 | RTEMS_API_Control *api; |
---|
147 | Event_Sync_states sync_state; |
---|
148 | |
---|
149 | executing = _Thread_Executing; |
---|
150 | executing->Wait.return_code = RTEMS_SUCCESSFUL; |
---|
151 | |
---|
152 | api = executing->API_Extensions[ THREAD_API_RTEMS ]; |
---|
153 | |
---|
154 | _ISR_Disable( level ); |
---|
155 | pending_events = api->pending_events; |
---|
156 | seized_events = _Event_sets_Get( pending_events, event_in ); |
---|
157 | |
---|
158 | if ( !_Event_sets_Is_empty( seized_events ) && |
---|
159 | (seized_events == event_in || _Options_Is_any( option_set )) ) { |
---|
160 | api->pending_events = |
---|
161 | _Event_sets_Clear( pending_events, seized_events ); |
---|
162 | _ISR_Enable( level ); |
---|
163 | *event_out = seized_events; |
---|
164 | return; |
---|
165 | } |
---|
166 | |
---|
167 | if ( _Options_Is_no_wait( option_set ) ) { |
---|
168 | _ISR_Enable( level ); |
---|
169 | executing->Wait.return_code = RTEMS_UNSATISFIED; |
---|
170 | *event_out = seized_events; |
---|
171 | return; |
---|
172 | } |
---|
173 | |
---|
174 | _Event_Sync_state = EVENT_SYNC_NOTHING_HAPPENED; |
---|
175 | |
---|
176 | executing->Wait.option = (unsigned32) option_set; |
---|
177 | executing->Wait.count = (unsigned32) event_in; |
---|
178 | executing->Wait.return_argument = event_out; |
---|
179 | |
---|
180 | _ISR_Enable( level ); |
---|
181 | |
---|
182 | if ( ticks ) { |
---|
183 | _Watchdog_Initialize( |
---|
184 | &executing->Timer, |
---|
185 | _Event_Timeout, |
---|
186 | executing->Object.id, |
---|
187 | NULL |
---|
188 | ); |
---|
189 | _Watchdog_Insert_ticks( &executing->Timer, ticks ); |
---|
190 | } |
---|
191 | |
---|
192 | _Thread_Set_state( executing, STATES_WAITING_FOR_EVENT ); |
---|
193 | |
---|
194 | _ISR_Disable( level ); |
---|
195 | |
---|
196 | sync_state = _Event_Sync_state; |
---|
197 | _Event_Sync_state = EVENT_SYNC_SYNCHRONIZED; |
---|
198 | |
---|
199 | switch ( sync_state ) { |
---|
200 | case EVENT_SYNC_SYNCHRONIZED: |
---|
201 | case EVENT_SYNC_NOTHING_HAPPENED: |
---|
202 | _ISR_Enable( level ); |
---|
203 | return; |
---|
204 | case EVENT_SYNC_TIMEOUT: |
---|
205 | executing->Wait.return_code = RTEMS_TIMEOUT; |
---|
206 | _ISR_Enable( level ); |
---|
207 | _Thread_Unblock( executing ); |
---|
208 | return; |
---|
209 | case EVENT_SYNC_SATISFIED: |
---|
210 | if ( _Watchdog_Is_active( &executing->Timer ) ) { |
---|
211 | _Watchdog_Deactivate( &executing->Timer ); |
---|
212 | _ISR_Enable( level ); |
---|
213 | (void) _Watchdog_Remove( &executing->Timer ); |
---|
214 | } else |
---|
215 | _ISR_Enable( level ); |
---|
216 | _Thread_Unblock( executing ); |
---|
217 | return; |
---|
218 | } |
---|
219 | } |
---|
220 | |
---|
221 | /*PAGE |
---|
222 | * |
---|
223 | * _Event_Surrender |
---|
224 | * |
---|
225 | * This routines remove a thread from the specified threadq. |
---|
226 | * |
---|
227 | * Input parameters: |
---|
228 | * the_thread - pointer to thread to be dequeued |
---|
229 | * |
---|
230 | * Output parameters: NONE |
---|
231 | * |
---|
232 | * INTERRUPT LATENCY: |
---|
233 | * before flash |
---|
234 | * after flash |
---|
235 | * check sync |
---|
236 | */ |
---|
237 | |
---|
238 | void _Event_Surrender( |
---|
239 | Thread_Control *the_thread |
---|
240 | ) |
---|
241 | { |
---|
242 | ISR_Level level; |
---|
243 | rtems_event_set pending_events; |
---|
244 | rtems_event_set event_condition; |
---|
245 | rtems_event_set seized_events; |
---|
246 | rtems_option option_set; |
---|
247 | RTEMS_API_Control *api; |
---|
248 | |
---|
249 | api = the_thread->API_Extensions[ THREAD_API_RTEMS ]; |
---|
250 | |
---|
251 | option_set = (rtems_option) the_thread->Wait.option; |
---|
252 | |
---|
253 | _ISR_Disable( level ); |
---|
254 | pending_events = api->pending_events; |
---|
255 | event_condition = (rtems_event_set) the_thread->Wait.count; |
---|
256 | |
---|
257 | seized_events = _Event_sets_Get( pending_events, event_condition ); |
---|
258 | |
---|
259 | if ( !_Event_sets_Is_empty( seized_events ) ) { |
---|
260 | if ( _States_Is_waiting_for_event( the_thread->current_state ) ) { |
---|
261 | if ( seized_events == event_condition || _Options_Is_any( option_set ) ) { |
---|
262 | api->pending_events = |
---|
263 | _Event_sets_Clear( pending_events, seized_events ); |
---|
264 | *(rtems_event_set *)the_thread->Wait.return_argument = seized_events; |
---|
265 | |
---|
266 | _ISR_Flash( level ); |
---|
267 | |
---|
268 | if ( !_Watchdog_Is_active( &the_thread->Timer ) ) { |
---|
269 | _ISR_Enable( level ); |
---|
270 | _Thread_Unblock( the_thread ); |
---|
271 | } |
---|
272 | else { |
---|
273 | _Watchdog_Deactivate( &the_thread->Timer ); |
---|
274 | _ISR_Enable( level ); |
---|
275 | (void) _Watchdog_Remove( &the_thread->Timer ); |
---|
276 | _Thread_Unblock( the_thread ); |
---|
277 | } |
---|
278 | return; |
---|
279 | } |
---|
280 | } |
---|
281 | |
---|
282 | switch ( _Event_Sync_state ) { |
---|
283 | case EVENT_SYNC_SYNCHRONIZED: |
---|
284 | case EVENT_SYNC_SATISFIED: |
---|
285 | break; |
---|
286 | |
---|
287 | case EVENT_SYNC_NOTHING_HAPPENED: |
---|
288 | case EVENT_SYNC_TIMEOUT: |
---|
289 | if ( !_Thread_Is_executing( the_thread ) ) |
---|
290 | break; |
---|
291 | |
---|
292 | if ( seized_events == event_condition || _Options_Is_any(option_set) ) { |
---|
293 | api->pending_events = |
---|
294 | _Event_sets_Clear( pending_events,seized_events ); |
---|
295 | *(rtems_event_set *)the_thread->Wait.return_argument = seized_events; |
---|
296 | _Event_Sync_state = EVENT_SYNC_SATISFIED; |
---|
297 | } |
---|
298 | break; |
---|
299 | } |
---|
300 | } |
---|
301 | _ISR_Enable( level ); |
---|
302 | } |
---|
303 | |
---|
304 | /*PAGE |
---|
305 | * |
---|
306 | * _Event_Timeout |
---|
307 | * |
---|
308 | * This routine processes a thread which timeouts while waiting to |
---|
309 | * receive an event_set. It is called by the watchdog handler. |
---|
310 | * |
---|
311 | * Input parameters: |
---|
312 | * id - thread id |
---|
313 | * |
---|
314 | * Output parameters: NONE |
---|
315 | */ |
---|
316 | |
---|
317 | void _Event_Timeout( |
---|
318 | Objects_Id id, |
---|
319 | void *ignored |
---|
320 | ) |
---|
321 | { |
---|
322 | Thread_Control *the_thread; |
---|
323 | Objects_Locations location; |
---|
324 | |
---|
325 | the_thread = _Thread_Get( id, &location ); |
---|
326 | switch ( location ) { |
---|
327 | case OBJECTS_ERROR: |
---|
328 | case OBJECTS_REMOTE: /* impossible */ |
---|
329 | break; |
---|
330 | case OBJECTS_LOCAL: |
---|
331 | if ( _Event_Sync_state != EVENT_SYNC_SYNCHRONIZED && |
---|
332 | _Thread_Is_executing( the_thread ) ) { |
---|
333 | if ( _Event_Sync_state != EVENT_SYNC_SATISFIED ) |
---|
334 | _Event_Sync_state = EVENT_SYNC_TIMEOUT; |
---|
335 | } else { |
---|
336 | the_thread->Wait.return_code = RTEMS_TIMEOUT; |
---|
337 | _Thread_Unblock( the_thread ); |
---|
338 | } |
---|
339 | _Thread_Unnest_dispatch(); |
---|
340 | break; |
---|
341 | } |
---|
342 | } |
---|