1 | /* |
---|
2 | * Copyright (c) 2015, 2016 embedded brains GmbH. All rights reserved. |
---|
3 | * |
---|
4 | * embedded brains GmbH |
---|
5 | * Dornierstr. 4 |
---|
6 | * 82178 Puchheim |
---|
7 | * Germany |
---|
8 | * <rtems@embedded-brains.de> |
---|
9 | * |
---|
10 | * The license and distribution terms for this file may be |
---|
11 | * found in the file LICENSE in this distribution or at |
---|
12 | * http://www.rtems.org/license/LICENSE. |
---|
13 | */ |
---|
14 | |
---|
15 | #if HAVE_CONFIG_H |
---|
16 | #include "config.h" |
---|
17 | #endif |
---|
18 | |
---|
19 | #include <sys/lock.h> |
---|
20 | #include <errno.h> |
---|
21 | |
---|
22 | #include <rtems/score/assert.h> |
---|
23 | #include <rtems/score/muteximpl.h> |
---|
24 | #include <rtems/score/threadimpl.h> |
---|
25 | #include <rtems/score/todimpl.h> |
---|
26 | |
---|
27 | #define MUTEX_TQ_OPERATIONS &_Thread_queue_Operations_priority_inherit |
---|
28 | |
---|
29 | RTEMS_STATIC_ASSERT( |
---|
30 | offsetof( Mutex_Control, Queue ) |
---|
31 | == offsetof( struct _Mutex_Control, _Queue ), |
---|
32 | MUTEX_CONTROL_QUEUE |
---|
33 | ); |
---|
34 | |
---|
35 | RTEMS_STATIC_ASSERT( |
---|
36 | sizeof( Mutex_Control ) == sizeof( struct _Mutex_Control ), |
---|
37 | MUTEX_CONTROL_SIZE |
---|
38 | ); |
---|
39 | |
---|
40 | RTEMS_STATIC_ASSERT( |
---|
41 | offsetof( Mutex_recursive_Control, Mutex ) |
---|
42 | == offsetof( struct _Mutex_recursive_Control, _Mutex ), |
---|
43 | MUTEX_RECURSIVE_CONTROL_MUTEX |
---|
44 | ); |
---|
45 | |
---|
46 | RTEMS_STATIC_ASSERT( |
---|
47 | offsetof( Mutex_recursive_Control, nest_level ) |
---|
48 | == offsetof( struct _Mutex_recursive_Control, _nest_level ), |
---|
49 | MUTEX_RECURSIVE_CONTROL_NEST_LEVEL |
---|
50 | ); |
---|
51 | |
---|
52 | RTEMS_STATIC_ASSERT( |
---|
53 | sizeof( Mutex_recursive_Control ) |
---|
54 | == sizeof( struct _Mutex_recursive_Control ), |
---|
55 | MUTEX_RECURSIVE_CONTROL_SIZE |
---|
56 | ); |
---|
57 | |
---|
58 | static Mutex_Control *_Mutex_Get( struct _Mutex_Control *_mutex ) |
---|
59 | { |
---|
60 | return (Mutex_Control *) _mutex; |
---|
61 | } |
---|
62 | |
---|
63 | static Thread_Control *_Mutex_Queue_acquire_critical( |
---|
64 | Mutex_Control *mutex, |
---|
65 | Thread_queue_Context *queue_context |
---|
66 | ) |
---|
67 | { |
---|
68 | Thread_Control *executing; |
---|
69 | |
---|
70 | executing = _Thread_Executing; |
---|
71 | _Thread_queue_Queue_acquire_critical( |
---|
72 | &mutex->Queue.Queue, |
---|
73 | &executing->Potpourri_stats, |
---|
74 | &queue_context->Lock_context.Lock_context |
---|
75 | ); |
---|
76 | |
---|
77 | return executing; |
---|
78 | } |
---|
79 | |
---|
80 | static void _Mutex_Queue_release( |
---|
81 | Mutex_Control *mutex, |
---|
82 | ISR_Level level, |
---|
83 | Thread_queue_Context *queue_context |
---|
84 | ) |
---|
85 | { |
---|
86 | _Thread_queue_Queue_release_critical( |
---|
87 | &mutex->Queue.Queue, |
---|
88 | &queue_context->Lock_context.Lock_context |
---|
89 | ); |
---|
90 | _ISR_Local_enable( level ); |
---|
91 | } |
---|
92 | |
---|
93 | static void _Mutex_Acquire_slow( |
---|
94 | Mutex_Control *mutex, |
---|
95 | Thread_Control *owner, |
---|
96 | Thread_Control *executing, |
---|
97 | ISR_Level level, |
---|
98 | Thread_queue_Context *queue_context |
---|
99 | ) |
---|
100 | { |
---|
101 | _Thread_queue_Context_set_thread_state( |
---|
102 | queue_context, |
---|
103 | STATES_WAITING_FOR_MUTEX |
---|
104 | ); |
---|
105 | _Thread_queue_Context_set_deadlock_callout( |
---|
106 | queue_context, |
---|
107 | _Thread_queue_Deadlock_fatal |
---|
108 | ); |
---|
109 | _Thread_queue_Context_set_ISR_level( queue_context, level ); |
---|
110 | _Thread_queue_Enqueue( |
---|
111 | &mutex->Queue.Queue, |
---|
112 | MUTEX_TQ_OPERATIONS, |
---|
113 | executing, |
---|
114 | queue_context |
---|
115 | ); |
---|
116 | } |
---|
117 | |
---|
118 | static void _Mutex_Release_critical( |
---|
119 | Mutex_Control *mutex, |
---|
120 | Thread_Control *executing, |
---|
121 | ISR_Level level, |
---|
122 | Thread_queue_Context *queue_context |
---|
123 | ) |
---|
124 | { |
---|
125 | Thread_queue_Heads *heads; |
---|
126 | |
---|
127 | heads = mutex->Queue.Queue.heads; |
---|
128 | mutex->Queue.Queue.owner = NULL; |
---|
129 | _Thread_Resource_count_decrement( executing ); |
---|
130 | |
---|
131 | if ( RTEMS_PREDICT_TRUE( heads == NULL ) ) { |
---|
132 | _Mutex_Queue_release( mutex, level, queue_context ); |
---|
133 | } else { |
---|
134 | _Thread_queue_Context_set_ISR_level( queue_context, level ); |
---|
135 | _Thread_queue_Surrender( |
---|
136 | &mutex->Queue.Queue, |
---|
137 | heads, |
---|
138 | executing, |
---|
139 | queue_context, |
---|
140 | MUTEX_TQ_OPERATIONS |
---|
141 | ); |
---|
142 | } |
---|
143 | } |
---|
144 | |
---|
145 | void _Mutex_Acquire( struct _Mutex_Control *_mutex ) |
---|
146 | { |
---|
147 | Mutex_Control *mutex; |
---|
148 | Thread_queue_Context queue_context; |
---|
149 | ISR_Level level; |
---|
150 | Thread_Control *executing; |
---|
151 | Thread_Control *owner; |
---|
152 | |
---|
153 | mutex = _Mutex_Get( _mutex ); |
---|
154 | _Thread_queue_Context_initialize( &queue_context ); |
---|
155 | _Thread_queue_Context_ISR_disable( &queue_context, level ); |
---|
156 | executing = _Mutex_Queue_acquire_critical( mutex, &queue_context ); |
---|
157 | |
---|
158 | owner = mutex->Queue.Queue.owner; |
---|
159 | |
---|
160 | if ( RTEMS_PREDICT_TRUE( owner == NULL ) ) { |
---|
161 | mutex->Queue.Queue.owner = executing; |
---|
162 | _Thread_Resource_count_increment( executing ); |
---|
163 | _Mutex_Queue_release( mutex, level, &queue_context ); |
---|
164 | } else { |
---|
165 | _Thread_queue_Context_set_enqueue_do_nothing_extra( &queue_context ); |
---|
166 | _Mutex_Acquire_slow( mutex, owner, executing, level, &queue_context ); |
---|
167 | } |
---|
168 | } |
---|
169 | |
---|
170 | int _Mutex_Acquire_timed( |
---|
171 | struct _Mutex_Control *_mutex, |
---|
172 | const struct timespec *abstime |
---|
173 | ) |
---|
174 | { |
---|
175 | Mutex_Control *mutex; |
---|
176 | Thread_queue_Context queue_context; |
---|
177 | ISR_Level level; |
---|
178 | Thread_Control *executing; |
---|
179 | Thread_Control *owner; |
---|
180 | |
---|
181 | mutex = _Mutex_Get( _mutex ); |
---|
182 | _Thread_queue_Context_initialize( &queue_context ); |
---|
183 | _Thread_queue_Context_ISR_disable( &queue_context, level ); |
---|
184 | executing = _Mutex_Queue_acquire_critical( mutex, &queue_context ); |
---|
185 | |
---|
186 | owner = mutex->Queue.Queue.owner; |
---|
187 | |
---|
188 | if ( RTEMS_PREDICT_TRUE( owner == NULL ) ) { |
---|
189 | mutex->Queue.Queue.owner = executing; |
---|
190 | _Thread_Resource_count_increment( executing ); |
---|
191 | _Mutex_Queue_release( mutex, level, &queue_context ); |
---|
192 | |
---|
193 | return 0; |
---|
194 | } else { |
---|
195 | _Thread_queue_Context_set_enqueue_timeout_realtime_timespec( |
---|
196 | &queue_context, |
---|
197 | abstime |
---|
198 | ); |
---|
199 | _Mutex_Acquire_slow( mutex, owner, executing, level, &queue_context ); |
---|
200 | |
---|
201 | return STATUS_GET_POSIX( _Thread_Wait_get_status( executing ) ); |
---|
202 | } |
---|
203 | } |
---|
204 | |
---|
205 | int _Mutex_Try_acquire( struct _Mutex_Control *_mutex ) |
---|
206 | { |
---|
207 | Mutex_Control *mutex; |
---|
208 | Thread_queue_Context queue_context; |
---|
209 | ISR_Level level; |
---|
210 | Thread_Control *executing; |
---|
211 | Thread_Control *owner; |
---|
212 | int eno; |
---|
213 | |
---|
214 | mutex = _Mutex_Get( _mutex ); |
---|
215 | _Thread_queue_Context_initialize( &queue_context ); |
---|
216 | _Thread_queue_Context_ISR_disable( &queue_context, level ); |
---|
217 | executing = _Mutex_Queue_acquire_critical( mutex, &queue_context ); |
---|
218 | |
---|
219 | owner = mutex->Queue.Queue.owner; |
---|
220 | |
---|
221 | if ( RTEMS_PREDICT_TRUE( owner == NULL ) ) { |
---|
222 | mutex->Queue.Queue.owner = executing; |
---|
223 | _Thread_Resource_count_increment( executing ); |
---|
224 | eno = 0; |
---|
225 | } else { |
---|
226 | eno = EBUSY; |
---|
227 | } |
---|
228 | |
---|
229 | _Mutex_Queue_release( mutex, level, &queue_context ); |
---|
230 | |
---|
231 | return eno; |
---|
232 | } |
---|
233 | |
---|
234 | void _Mutex_Release( struct _Mutex_Control *_mutex ) |
---|
235 | { |
---|
236 | Mutex_Control *mutex; |
---|
237 | Thread_queue_Context queue_context; |
---|
238 | ISR_Level level; |
---|
239 | Thread_Control *executing; |
---|
240 | |
---|
241 | mutex = _Mutex_Get( _mutex ); |
---|
242 | _Thread_queue_Context_initialize( &queue_context ); |
---|
243 | _Thread_queue_Context_ISR_disable( &queue_context, level ); |
---|
244 | executing = _Mutex_Queue_acquire_critical( mutex, &queue_context ); |
---|
245 | |
---|
246 | _Assert( mutex->Queue.Queue.owner == executing ); |
---|
247 | |
---|
248 | _Mutex_Release_critical( mutex, executing, level, &queue_context ); |
---|
249 | } |
---|
250 | |
---|
251 | static Mutex_recursive_Control *_Mutex_recursive_Get( |
---|
252 | struct _Mutex_recursive_Control *_mutex |
---|
253 | ) |
---|
254 | { |
---|
255 | return (Mutex_recursive_Control *) _mutex; |
---|
256 | } |
---|
257 | |
---|
258 | void _Mutex_recursive_Acquire( struct _Mutex_recursive_Control *_mutex ) |
---|
259 | { |
---|
260 | Mutex_recursive_Control *mutex; |
---|
261 | Thread_queue_Context queue_context; |
---|
262 | ISR_Level level; |
---|
263 | Thread_Control *executing; |
---|
264 | Thread_Control *owner; |
---|
265 | |
---|
266 | mutex = _Mutex_recursive_Get( _mutex ); |
---|
267 | _Thread_queue_Context_initialize( &queue_context ); |
---|
268 | _Thread_queue_Context_ISR_disable( &queue_context, level ); |
---|
269 | executing = _Mutex_Queue_acquire_critical( &mutex->Mutex, &queue_context ); |
---|
270 | |
---|
271 | owner = mutex->Mutex.Queue.Queue.owner; |
---|
272 | |
---|
273 | if ( RTEMS_PREDICT_TRUE( owner == NULL ) ) { |
---|
274 | mutex->Mutex.Queue.Queue.owner = executing; |
---|
275 | _Thread_Resource_count_increment( executing ); |
---|
276 | _Mutex_Queue_release( &mutex->Mutex, level, &queue_context ); |
---|
277 | } else if ( owner == executing ) { |
---|
278 | ++mutex->nest_level; |
---|
279 | _Mutex_Queue_release( &mutex->Mutex, level, &queue_context ); |
---|
280 | } else { |
---|
281 | _Thread_queue_Context_set_enqueue_do_nothing_extra( &queue_context ); |
---|
282 | _Mutex_Acquire_slow( &mutex->Mutex, owner, executing, level, &queue_context ); |
---|
283 | } |
---|
284 | } |
---|
285 | |
---|
286 | int _Mutex_recursive_Acquire_timed( |
---|
287 | struct _Mutex_recursive_Control *_mutex, |
---|
288 | const struct timespec *abstime |
---|
289 | ) |
---|
290 | { |
---|
291 | Mutex_recursive_Control *mutex; |
---|
292 | Thread_queue_Context queue_context; |
---|
293 | ISR_Level level; |
---|
294 | Thread_Control *executing; |
---|
295 | Thread_Control *owner; |
---|
296 | |
---|
297 | mutex = _Mutex_recursive_Get( _mutex ); |
---|
298 | _Thread_queue_Context_initialize( &queue_context ); |
---|
299 | _Thread_queue_Context_ISR_disable( &queue_context, level ); |
---|
300 | executing = _Mutex_Queue_acquire_critical( &mutex->Mutex, &queue_context ); |
---|
301 | |
---|
302 | owner = mutex->Mutex.Queue.Queue.owner; |
---|
303 | |
---|
304 | if ( RTEMS_PREDICT_TRUE( owner == NULL ) ) { |
---|
305 | mutex->Mutex.Queue.Queue.owner = executing; |
---|
306 | _Thread_Resource_count_increment( executing ); |
---|
307 | _Mutex_Queue_release( &mutex->Mutex, level, &queue_context ); |
---|
308 | |
---|
309 | return 0; |
---|
310 | } else if ( owner == executing ) { |
---|
311 | ++mutex->nest_level; |
---|
312 | _Mutex_Queue_release( &mutex->Mutex, level, &queue_context ); |
---|
313 | |
---|
314 | return 0; |
---|
315 | } else { |
---|
316 | _Thread_queue_Context_set_enqueue_timeout_realtime_timespec( |
---|
317 | &queue_context, |
---|
318 | abstime |
---|
319 | ); |
---|
320 | _Mutex_Acquire_slow( &mutex->Mutex, owner, executing, level, &queue_context ); |
---|
321 | |
---|
322 | return STATUS_GET_POSIX( _Thread_Wait_get_status( executing ) ); |
---|
323 | } |
---|
324 | } |
---|
325 | |
---|
326 | int _Mutex_recursive_Try_acquire( struct _Mutex_recursive_Control *_mutex ) |
---|
327 | { |
---|
328 | Mutex_recursive_Control *mutex; |
---|
329 | Thread_queue_Context queue_context; |
---|
330 | ISR_Level level; |
---|
331 | Thread_Control *executing; |
---|
332 | Thread_Control *owner; |
---|
333 | int eno; |
---|
334 | |
---|
335 | mutex = _Mutex_recursive_Get( _mutex ); |
---|
336 | _Thread_queue_Context_initialize( &queue_context ); |
---|
337 | _Thread_queue_Context_ISR_disable( &queue_context, level ); |
---|
338 | executing = _Mutex_Queue_acquire_critical( &mutex->Mutex, &queue_context ); |
---|
339 | |
---|
340 | owner = mutex->Mutex.Queue.Queue.owner; |
---|
341 | |
---|
342 | if ( RTEMS_PREDICT_TRUE( owner == NULL ) ) { |
---|
343 | mutex->Mutex.Queue.Queue.owner = executing; |
---|
344 | _Thread_Resource_count_increment( executing ); |
---|
345 | eno = 0; |
---|
346 | } else if ( owner == executing ) { |
---|
347 | ++mutex->nest_level; |
---|
348 | eno = 0; |
---|
349 | } else { |
---|
350 | eno = EBUSY; |
---|
351 | } |
---|
352 | |
---|
353 | _Mutex_Queue_release( &mutex->Mutex, level, &queue_context ); |
---|
354 | |
---|
355 | return eno; |
---|
356 | } |
---|
357 | |
---|
358 | void _Mutex_recursive_Release( struct _Mutex_recursive_Control *_mutex ) |
---|
359 | { |
---|
360 | Mutex_recursive_Control *mutex; |
---|
361 | Thread_queue_Context queue_context; |
---|
362 | ISR_Level level; |
---|
363 | Thread_Control *executing; |
---|
364 | unsigned int nest_level; |
---|
365 | |
---|
366 | mutex = _Mutex_recursive_Get( _mutex ); |
---|
367 | _Thread_queue_Context_initialize( &queue_context ); |
---|
368 | _Thread_queue_Context_ISR_disable( &queue_context, level ); |
---|
369 | executing = _Mutex_Queue_acquire_critical( &mutex->Mutex, &queue_context ); |
---|
370 | |
---|
371 | _Assert( mutex->Mutex.Queue.Queue.owner == executing ); |
---|
372 | |
---|
373 | nest_level = mutex->nest_level; |
---|
374 | |
---|
375 | if ( RTEMS_PREDICT_TRUE( nest_level == 0 ) ) { |
---|
376 | _Mutex_Release_critical( &mutex->Mutex, executing, level, &queue_context ); |
---|
377 | } else { |
---|
378 | mutex->nest_level = nest_level - 1; |
---|
379 | |
---|
380 | _Mutex_Queue_release( &mutex->Mutex, level, &queue_context ); |
---|
381 | } |
---|
382 | } |
---|