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1da177e4 LT |
1 | |
2 | /****************************************************************************** | |
3 | * | |
4 | * Module Name: exmutex - ASL Mutex Acquire/Release functions | |
5 | * | |
6 | *****************************************************************************/ | |
7 | ||
8 | /* | |
a8357b0c | 9 | * Copyright (C) 2000 - 2010, Intel Corp. |
1da177e4 LT |
10 | * All rights reserved. |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions, and the following disclaimer, | |
17 | * without modification. | |
18 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
19 | * substantially similar to the "NO WARRANTY" disclaimer below | |
20 | * ("Disclaimer") and any redistribution must be conditioned upon | |
21 | * including a substantially similar Disclaimer requirement for further | |
22 | * binary redistribution. | |
23 | * 3. Neither the names of the above-listed copyright holders nor the names | |
24 | * of any contributors may be used to endorse or promote products derived | |
25 | * from this software without specific prior written permission. | |
26 | * | |
27 | * Alternatively, this software may be distributed under the terms of the | |
28 | * GNU General Public License ("GPL") version 2 as published by the Free | |
29 | * Software Foundation. | |
30 | * | |
31 | * NO WARRANTY | |
32 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
33 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
34 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
35 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
36 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
37 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
38 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
40 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
41 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
42 | * POSSIBILITY OF SUCH DAMAGES. | |
43 | */ | |
44 | ||
1da177e4 | 45 | #include <acpi/acpi.h> |
e2f7a777 LB |
46 | #include "accommon.h" |
47 | #include "acinterp.h" | |
48 | #include "acevents.h" | |
1da177e4 LT |
49 | |
50 | #define _COMPONENT ACPI_EXECUTER | |
4be44fcd | 51 | ACPI_MODULE_NAME("exmutex") |
1da177e4 | 52 | |
44f6c012 | 53 | /* Local prototypes */ |
44f6c012 | 54 | static void |
4be44fcd LB |
55 | acpi_ex_link_mutex(union acpi_operand_object *obj_desc, |
56 | struct acpi_thread_state *thread); | |
1da177e4 LT |
57 | |
58 | /******************************************************************************* | |
59 | * | |
60 | * FUNCTION: acpi_ex_unlink_mutex | |
61 | * | |
62 | * PARAMETERS: obj_desc - The mutex to be unlinked | |
63 | * | |
44f6c012 | 64 | * RETURN: None |
1da177e4 | 65 | * |
b229cf92 | 66 | * DESCRIPTION: Remove a mutex from the "AcquiredMutex" list |
1da177e4 LT |
67 | * |
68 | ******************************************************************************/ | |
69 | ||
262a7a28 | 70 | void acpi_ex_unlink_mutex(union acpi_operand_object *obj_desc) |
1da177e4 | 71 | { |
262a7a28 LB |
72 | struct acpi_thread_state *thread = obj_desc->mutex.owner_thread; |
73 | ||
1da177e4 LT |
74 | if (!thread) { |
75 | return; | |
76 | } | |
77 | ||
78 | /* Doubly linked list */ | |
79 | ||
80 | if (obj_desc->mutex.next) { | |
81 | (obj_desc->mutex.next)->mutex.prev = obj_desc->mutex.prev; | |
82 | } | |
83 | ||
84 | if (obj_desc->mutex.prev) { | |
85 | (obj_desc->mutex.prev)->mutex.next = obj_desc->mutex.next; | |
10a3b461 BM |
86 | |
87 | /* | |
88 | * Migrate the previous sync level associated with this mutex to the | |
89 | * previous mutex on the list so that it may be preserved. This handles | |
90 | * the case where several mutexes have been acquired at the same level, | |
91 | * but are not released in opposite order. | |
92 | */ | |
93 | (obj_desc->mutex.prev)->mutex.original_sync_level = | |
94 | obj_desc->mutex.original_sync_level; | |
4be44fcd | 95 | } else { |
1da177e4 LT |
96 | thread->acquired_mutex_list = obj_desc->mutex.next; |
97 | } | |
98 | } | |
99 | ||
1da177e4 LT |
100 | /******************************************************************************* |
101 | * | |
102 | * FUNCTION: acpi_ex_link_mutex | |
103 | * | |
44f6c012 RM |
104 | * PARAMETERS: obj_desc - The mutex to be linked |
105 | * Thread - Current executing thread object | |
1da177e4 | 106 | * |
44f6c012 | 107 | * RETURN: None |
1da177e4 | 108 | * |
b229cf92 | 109 | * DESCRIPTION: Add a mutex to the "AcquiredMutex" list for this walk |
1da177e4 LT |
110 | * |
111 | ******************************************************************************/ | |
112 | ||
44f6c012 | 113 | static void |
4be44fcd LB |
114 | acpi_ex_link_mutex(union acpi_operand_object *obj_desc, |
115 | struct acpi_thread_state *thread) | |
1da177e4 | 116 | { |
4be44fcd | 117 | union acpi_operand_object *list_head; |
1da177e4 LT |
118 | |
119 | list_head = thread->acquired_mutex_list; | |
120 | ||
121 | /* This object will be the first object in the list */ | |
122 | ||
123 | obj_desc->mutex.prev = NULL; | |
124 | obj_desc->mutex.next = list_head; | |
125 | ||
126 | /* Update old first object to point back to this object */ | |
127 | ||
128 | if (list_head) { | |
129 | list_head->mutex.prev = obj_desc; | |
130 | } | |
131 | ||
132 | /* Update list head */ | |
133 | ||
134 | thread->acquired_mutex_list = obj_desc; | |
135 | } | |
136 | ||
ba886cd4 BM |
137 | /******************************************************************************* |
138 | * | |
139 | * FUNCTION: acpi_ex_acquire_mutex_object | |
140 | * | |
141 | * PARAMETERS: time_desc - Timeout in milliseconds | |
142 | * obj_desc - Mutex object | |
143 | * Thread - Current thread state | |
144 | * | |
145 | * RETURN: Status | |
146 | * | |
91e38d10 BM |
147 | * DESCRIPTION: Acquire an AML mutex, low-level interface. Provides a common |
148 | * path that supports multiple acquires by the same thread. | |
149 | * | |
150 | * MUTEX: Interpreter must be locked | |
151 | * | |
152 | * NOTE: This interface is called from three places: | |
153 | * 1) From acpi_ex_acquire_mutex, via an AML Acquire() operator | |
154 | * 2) From acpi_ex_acquire_global_lock when an AML Field access requires the | |
155 | * global lock | |
156 | * 3) From the external interface, acpi_acquire_global_lock | |
ba886cd4 BM |
157 | * |
158 | ******************************************************************************/ | |
159 | ||
160 | acpi_status | |
161 | acpi_ex_acquire_mutex_object(u16 timeout, | |
162 | union acpi_operand_object *obj_desc, | |
163 | acpi_thread_id thread_id) | |
164 | { | |
165 | acpi_status status; | |
166 | ||
167 | ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc); | |
168 | ||
f02e9fa1 BM |
169 | if (!obj_desc) { |
170 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
171 | } | |
172 | ||
ba886cd4 BM |
173 | /* Support for multiple acquires by the owning thread */ |
174 | ||
175 | if (obj_desc->mutex.thread_id == thread_id) { | |
176 | /* | |
177 | * The mutex is already owned by this thread, just increment the | |
178 | * acquisition depth | |
179 | */ | |
180 | obj_desc->mutex.acquisition_depth++; | |
181 | return_ACPI_STATUS(AE_OK); | |
182 | } | |
183 | ||
184 | /* Acquire the mutex, wait if necessary. Special case for Global Lock */ | |
185 | ||
186 | if (obj_desc == acpi_gbl_global_lock_mutex) { | |
187 | status = acpi_ev_acquire_global_lock(timeout); | |
188 | } else { | |
189 | status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex, | |
190 | timeout); | |
191 | } | |
192 | ||
193 | if (ACPI_FAILURE(status)) { | |
194 | ||
195 | /* Includes failure from a timeout on time_desc */ | |
196 | ||
197 | return_ACPI_STATUS(status); | |
198 | } | |
199 | ||
91e38d10 | 200 | /* Acquired the mutex: update mutex object */ |
ba886cd4 BM |
201 | |
202 | obj_desc->mutex.thread_id = thread_id; | |
203 | obj_desc->mutex.acquisition_depth = 1; | |
204 | obj_desc->mutex.original_sync_level = 0; | |
205 | obj_desc->mutex.owner_thread = NULL; /* Used only for AML Acquire() */ | |
206 | ||
207 | return_ACPI_STATUS(AE_OK); | |
208 | } | |
209 | ||
1da177e4 LT |
210 | /******************************************************************************* |
211 | * | |
212 | * FUNCTION: acpi_ex_acquire_mutex | |
213 | * | |
44f6c012 RM |
214 | * PARAMETERS: time_desc - Timeout integer |
215 | * obj_desc - Mutex object | |
216 | * walk_state - Current method execution state | |
1da177e4 LT |
217 | * |
218 | * RETURN: Status | |
219 | * | |
220 | * DESCRIPTION: Acquire an AML mutex | |
221 | * | |
222 | ******************************************************************************/ | |
223 | ||
224 | acpi_status | |
4be44fcd LB |
225 | acpi_ex_acquire_mutex(union acpi_operand_object *time_desc, |
226 | union acpi_operand_object *obj_desc, | |
227 | struct acpi_walk_state *walk_state) | |
1da177e4 | 228 | { |
4be44fcd | 229 | acpi_status status; |
1da177e4 | 230 | |
b229cf92 | 231 | ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex, obj_desc); |
1da177e4 LT |
232 | |
233 | if (!obj_desc) { | |
4be44fcd | 234 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
235 | } |
236 | ||
91e38d10 | 237 | /* Must have a valid thread ID */ |
1da177e4 LT |
238 | |
239 | if (!walk_state->thread) { | |
b8e4d893 BM |
240 | ACPI_ERROR((AE_INFO, |
241 | "Cannot acquire Mutex [%4.4s], null thread info", | |
242 | acpi_ut_get_node_name(obj_desc->mutex.node))); | |
4be44fcd | 243 | return_ACPI_STATUS(AE_AML_INTERNAL); |
1da177e4 LT |
244 | } |
245 | ||
246 | /* | |
91e38d10 | 247 | * Current sync level must be less than or equal to the sync level of the |
967440e3 | 248 | * mutex. This mechanism provides some deadlock prevention |
1da177e4 LT |
249 | */ |
250 | if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) { | |
b8e4d893 | 251 | ACPI_ERROR((AE_INFO, |
967440e3 BM |
252 | "Cannot acquire Mutex [%4.4s], current SyncLevel is too large (%d)", |
253 | acpi_ut_get_node_name(obj_desc->mutex.node), | |
254 | walk_state->thread->current_sync_level)); | |
4be44fcd | 255 | return_ACPI_STATUS(AE_AML_MUTEX_ORDER); |
1da177e4 LT |
256 | } |
257 | ||
ba886cd4 BM |
258 | status = acpi_ex_acquire_mutex_object((u16) time_desc->integer.value, |
259 | obj_desc, | |
260 | walk_state->thread->thread_id); | |
261 | if (ACPI_SUCCESS(status) && obj_desc->mutex.acquisition_depth == 1) { | |
91e38d10 BM |
262 | |
263 | /* Save Thread object, original/current sync levels */ | |
264 | ||
ba886cd4 BM |
265 | obj_desc->mutex.owner_thread = walk_state->thread; |
266 | obj_desc->mutex.original_sync_level = | |
267 | walk_state->thread->current_sync_level; | |
268 | walk_state->thread->current_sync_level = | |
269 | obj_desc->mutex.sync_level; | |
1da177e4 | 270 | |
ba886cd4 BM |
271 | /* Link the mutex to the current thread for force-unlock at method exit */ |
272 | ||
273 | acpi_ex_link_mutex(obj_desc, walk_state->thread); | |
1da177e4 LT |
274 | } |
275 | ||
ba886cd4 BM |
276 | return_ACPI_STATUS(status); |
277 | } | |
c81da666 | 278 | |
ba886cd4 BM |
279 | /******************************************************************************* |
280 | * | |
281 | * FUNCTION: acpi_ex_release_mutex_object | |
282 | * | |
283 | * PARAMETERS: obj_desc - The object descriptor for this op | |
284 | * | |
285 | * RETURN: Status | |
286 | * | |
287 | * DESCRIPTION: Release a previously acquired Mutex, low level interface. | |
91e38d10 BM |
288 | * Provides a common path that supports multiple releases (after |
289 | * previous multiple acquires) by the same thread. | |
290 | * | |
291 | * MUTEX: Interpreter must be locked | |
292 | * | |
293 | * NOTE: This interface is called from three places: | |
294 | * 1) From acpi_ex_release_mutex, via an AML Acquire() operator | |
295 | * 2) From acpi_ex_release_global_lock when an AML Field access requires the | |
296 | * global lock | |
297 | * 3) From the external interface, acpi_release_global_lock | |
ba886cd4 BM |
298 | * |
299 | ******************************************************************************/ | |
1da177e4 | 300 | |
ba886cd4 BM |
301 | acpi_status acpi_ex_release_mutex_object(union acpi_operand_object *obj_desc) |
302 | { | |
303 | acpi_status status = AE_OK; | |
52fc0b02 | 304 | |
ba886cd4 | 305 | ACPI_FUNCTION_TRACE(ex_release_mutex_object); |
1da177e4 | 306 | |
f02e9fa1 BM |
307 | if (obj_desc->mutex.acquisition_depth == 0) { |
308 | return (AE_NOT_ACQUIRED); | |
309 | } | |
310 | ||
ba886cd4 BM |
311 | /* Match multiple Acquires with multiple Releases */ |
312 | ||
313 | obj_desc->mutex.acquisition_depth--; | |
314 | if (obj_desc->mutex.acquisition_depth != 0) { | |
315 | ||
316 | /* Just decrement the depth and return */ | |
317 | ||
318 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
319 | } |
320 | ||
ba886cd4 | 321 | if (obj_desc->mutex.owner_thread) { |
1da177e4 | 322 | |
ba886cd4 BM |
323 | /* Unlink the mutex from the owner's list */ |
324 | ||
325 | acpi_ex_unlink_mutex(obj_desc); | |
326 | obj_desc->mutex.owner_thread = NULL; | |
327 | } | |
1da177e4 | 328 | |
ba886cd4 | 329 | /* Release the mutex, special case for Global Lock */ |
1da177e4 | 330 | |
ba886cd4 BM |
331 | if (obj_desc == acpi_gbl_global_lock_mutex) { |
332 | status = acpi_ev_release_global_lock(); | |
333 | } else { | |
334 | acpi_os_release_mutex(obj_desc->mutex.os_mutex); | |
335 | } | |
1da177e4 | 336 | |
91e38d10 BM |
337 | /* Clear mutex info */ |
338 | ||
b62151de | 339 | obj_desc->mutex.thread_id = NULL; |
ba886cd4 | 340 | return_ACPI_STATUS(status); |
1da177e4 LT |
341 | } |
342 | ||
1da177e4 LT |
343 | /******************************************************************************* |
344 | * | |
345 | * FUNCTION: acpi_ex_release_mutex | |
346 | * | |
347 | * PARAMETERS: obj_desc - The object descriptor for this op | |
44f6c012 | 348 | * walk_state - Current method execution state |
1da177e4 LT |
349 | * |
350 | * RETURN: Status | |
351 | * | |
352 | * DESCRIPTION: Release a previously acquired Mutex. | |
353 | * | |
354 | ******************************************************************************/ | |
355 | ||
356 | acpi_status | |
4be44fcd LB |
357 | acpi_ex_release_mutex(union acpi_operand_object *obj_desc, |
358 | struct acpi_walk_state *walk_state) | |
1da177e4 | 359 | { |
c81da666 | 360 | acpi_status status = AE_OK; |
10a3b461 | 361 | u8 previous_sync_level; |
1da177e4 | 362 | |
b229cf92 | 363 | ACPI_FUNCTION_TRACE(ex_release_mutex); |
1da177e4 LT |
364 | |
365 | if (!obj_desc) { | |
4be44fcd | 366 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
367 | } |
368 | ||
369 | /* The mutex must have been previously acquired in order to release it */ | |
370 | ||
262a7a28 | 371 | if (!obj_desc->mutex.owner_thread) { |
b8e4d893 BM |
372 | ACPI_ERROR((AE_INFO, |
373 | "Cannot release Mutex [%4.4s], not acquired", | |
374 | acpi_ut_get_node_name(obj_desc->mutex.node))); | |
4be44fcd | 375 | return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED); |
1da177e4 LT |
376 | } |
377 | ||
fbc3be2a DC |
378 | /* Must have a valid thread ID */ |
379 | ||
380 | if (!walk_state->thread) { | |
381 | ACPI_ERROR((AE_INFO, | |
382 | "Cannot release Mutex [%4.4s], null thread info", | |
383 | acpi_ut_get_node_name(obj_desc->mutex.node))); | |
384 | return_ACPI_STATUS(AE_AML_INTERNAL); | |
385 | } | |
386 | ||
1da177e4 LT |
387 | /* |
388 | * The Mutex is owned, but this thread must be the owner. | |
389 | * Special case for Global Lock, any thread can release | |
390 | */ | |
262a7a28 | 391 | if ((obj_desc->mutex.owner_thread->thread_id != |
4be44fcd | 392 | walk_state->thread->thread_id) |
ba886cd4 | 393 | && (obj_desc != acpi_gbl_global_lock_mutex)) { |
b8e4d893 | 394 | ACPI_ERROR((AE_INFO, |
10b6575b BM |
395 | "Thread %p cannot release Mutex [%4.4s] acquired by thread %p", |
396 | ACPI_CAST_PTR(void, walk_state->thread->thread_id), | |
b8e4d893 | 397 | acpi_ut_get_node_name(obj_desc->mutex.node), |
10b6575b BM |
398 | ACPI_CAST_PTR(void, |
399 | obj_desc->mutex.owner_thread-> | |
400 | thread_id))); | |
4be44fcd | 401 | return_ACPI_STATUS(AE_AML_NOT_OWNER); |
1da177e4 LT |
402 | } |
403 | ||
404 | /* | |
315c7288 BM |
405 | * The sync level of the mutex must be equal to the current sync level. In |
406 | * other words, the current level means that at least one mutex at that | |
407 | * level is currently being held. Attempting to release a mutex of a | |
408 | * different level can only mean that the mutex ordering rule is being | |
409 | * violated. This behavior is clarified in ACPI 4.0 specification. | |
1da177e4 | 410 | */ |
315c7288 BM |
411 | if (obj_desc->mutex.sync_level != |
412 | walk_state->thread->current_sync_level) { | |
b8e4d893 | 413 | ACPI_ERROR((AE_INFO, |
f02e9fa1 BM |
414 | "Cannot release Mutex [%4.4s], SyncLevel mismatch: mutex %d current %d", |
415 | acpi_ut_get_node_name(obj_desc->mutex.node), | |
416 | obj_desc->mutex.sync_level, | |
417 | walk_state->thread->current_sync_level)); | |
4be44fcd | 418 | return_ACPI_STATUS(AE_AML_MUTEX_ORDER); |
1da177e4 LT |
419 | } |
420 | ||
10a3b461 BM |
421 | /* |
422 | * Get the previous sync_level from the head of the acquired mutex list. | |
423 | * This handles the case where several mutexes at the same level have been | |
424 | * acquired, but are not released in reverse order. | |
425 | */ | |
426 | previous_sync_level = | |
427 | walk_state->thread->acquired_mutex_list->mutex.original_sync_level; | |
428 | ||
ba886cd4 | 429 | status = acpi_ex_release_mutex_object(obj_desc); |
315c7288 BM |
430 | if (ACPI_FAILURE(status)) { |
431 | return_ACPI_STATUS(status); | |
432 | } | |
1da177e4 | 433 | |
f02e9fa1 | 434 | if (obj_desc->mutex.acquisition_depth == 0) { |
1da177e4 | 435 | |
315c7288 | 436 | /* Restore the previous sync_level */ |
f02e9fa1 | 437 | |
10a3b461 | 438 | walk_state->thread->current_sync_level = previous_sync_level; |
f02e9fa1 | 439 | } |
4be44fcd | 440 | return_ACPI_STATUS(status); |
1da177e4 LT |
441 | } |
442 | ||
1da177e4 LT |
443 | /******************************************************************************* |
444 | * | |
445 | * FUNCTION: acpi_ex_release_all_mutexes | |
446 | * | |
44f6c012 | 447 | * PARAMETERS: Thread - Current executing thread object |
1da177e4 LT |
448 | * |
449 | * RETURN: Status | |
450 | * | |
44f6c012 | 451 | * DESCRIPTION: Release all mutexes held by this thread |
1da177e4 | 452 | * |
f70a5e7b BM |
453 | * NOTE: This function is called as the thread is exiting the interpreter. |
454 | * Mutexes are not released when an individual control method is exited, but | |
455 | * only when the parent thread actually exits the interpreter. This allows one | |
456 | * method to acquire a mutex, and a different method to release it, as long as | |
457 | * this is performed underneath a single parent control method. | |
458 | * | |
1da177e4 LT |
459 | ******************************************************************************/ |
460 | ||
4be44fcd | 461 | void acpi_ex_release_all_mutexes(struct acpi_thread_state *thread) |
1da177e4 | 462 | { |
4be44fcd | 463 | union acpi_operand_object *next = thread->acquired_mutex_list; |
c81da666 | 464 | union acpi_operand_object *obj_desc; |
1da177e4 | 465 | |
4be44fcd | 466 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
467 | |
468 | /* Traverse the list of owned mutexes, releasing each one */ | |
469 | ||
470 | while (next) { | |
c81da666 BM |
471 | obj_desc = next; |
472 | next = obj_desc->mutex.next; | |
473 | ||
474 | obj_desc->mutex.prev = NULL; | |
475 | obj_desc->mutex.next = NULL; | |
f70a5e7b | 476 | obj_desc->mutex.acquisition_depth = 0; |
c81da666 BM |
477 | |
478 | /* Release the mutex, special case for Global Lock */ | |
1da177e4 | 479 | |
ba886cd4 | 480 | if (obj_desc == acpi_gbl_global_lock_mutex) { |
1da177e4 | 481 | |
c81da666 | 482 | /* Ignore errors */ |
1da177e4 | 483 | |
c81da666 BM |
484 | (void)acpi_ev_release_global_lock(); |
485 | } else { | |
486 | acpi_os_release_mutex(obj_desc->mutex.os_mutex); | |
1da177e4 LT |
487 | } |
488 | ||
489 | /* Mark mutex unowned */ | |
490 | ||
262a7a28 | 491 | obj_desc->mutex.owner_thread = NULL; |
b62151de | 492 | obj_desc->mutex.thread_id = NULL; |
1da177e4 LT |
493 | |
494 | /* Update Thread sync_level (Last mutex is the important one) */ | |
495 | ||
c81da666 BM |
496 | thread->current_sync_level = |
497 | obj_desc->mutex.original_sync_level; | |
1da177e4 LT |
498 | } |
499 | } |