Add cmm_emit_legacy_smp_mb()
[urcu.git] / include / urcu / wfcqueue.h
1 // SPDX-FileCopyrightText: 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
2 // SPDX-FileCopyrightText: 2011-2012 Lai Jiangshan <laijs@cn.fujitsu.com>
3 //
4 // SPDX-License-Identifier: LGPL-2.1-or-later
5
6 #ifndef _URCU_WFCQUEUE_H
7 #define _URCU_WFCQUEUE_H
8
9 /*
10 * Userspace RCU library - Concurrent Queue with Wait-Free Enqueue/Blocking Dequeue
11 */
12
13 #include <pthread.h>
14 #include <stdbool.h>
15 #include <urcu/compiler.h>
16 #include <urcu/arch.h>
17
18 #ifdef __cplusplus
19 extern "C" {
20 #endif
21
22 /*
23 * Concurrent queue with wait-free enqueue/blocking dequeue.
24 *
25 * This queue has been designed and implemented collaboratively by
26 * Mathieu Desnoyers and Lai Jiangshan. Inspired from
27 * half-wait-free/half-blocking queue implementation done by Paul E.
28 * McKenney.
29 */
30
31 #define CDS_WFCQ_WOULDBLOCK ((struct cds_wfcq_node *) -1UL)
32
33 enum cds_wfcq_ret {
34 CDS_WFCQ_RET_WOULDBLOCK = -1,
35 CDS_WFCQ_RET_DEST_EMPTY = 0,
36 CDS_WFCQ_RET_DEST_NON_EMPTY = 1,
37 CDS_WFCQ_RET_SRC_EMPTY = 2,
38 };
39
40 enum cds_wfcq_state {
41 CDS_WFCQ_STATE_LAST = (1U << 0),
42 };
43
44 struct cds_wfcq_node {
45 struct cds_wfcq_node *next;
46 };
47
48 /*
49 * Do not put head and tail on the same cache-line if concurrent
50 * enqueue/dequeue are expected from many CPUs. This eliminates
51 * false-sharing between enqueue and dequeue.
52 */
53 struct __cds_wfcq_head {
54 struct cds_wfcq_node node;
55 };
56
57 struct cds_wfcq_head {
58 struct cds_wfcq_node node;
59 pthread_mutex_t lock;
60 };
61
62 /*
63 * In C, the transparent union allows calling functions that work on both
64 * struct cds_wfcq_head and struct __cds_wfcq_head on any of those two
65 * types.
66 *
67 * In C++, implement static inline wrappers using function overloading
68 * to obtain an API similar to C.
69 *
70 * Avoid complaints from clang++ not knowing the transparent union
71 * attribute.
72 */
73 #if defined(__clang__)
74 #pragma clang diagnostic push
75 #pragma clang diagnostic ignored "-Wignored-attributes"
76 #endif
77 typedef union {
78 struct __cds_wfcq_head *_h;
79 struct cds_wfcq_head *h;
80 } __attribute__((__transparent_union__)) cds_wfcq_head_ptr_t;
81 #if defined(__clang__)
82 #pragma clang diagnostic pop
83 #endif
84
85 #ifndef __cplusplus
86 /*
87 * This static inline is only present for compatibility with C++. It is
88 * effect-less in C.
89 */
90 static inline struct __cds_wfcq_head *__cds_wfcq_head_cast(struct __cds_wfcq_head *head)
91 {
92 return head;
93 }
94
95 /*
96 * This static inline is only present for compatibility with C++. It is
97 * effect-less in C.
98 */
99 static inline struct cds_wfcq_head *cds_wfcq_head_cast(struct cds_wfcq_head *head)
100 {
101 return head;
102 }
103 #else /* #ifndef __cplusplus */
104
105 /*
106 * This static inline is used by internally in the static inline
107 * implementation of the API.
108 */
109 static inline cds_wfcq_head_ptr_t __cds_wfcq_head_cast(struct __cds_wfcq_head *head)
110 {
111 cds_wfcq_head_ptr_t ret = { ._h = head };
112 return ret;
113 }
114
115 /*
116 * This static inline is used by internally in the static inline
117 * implementation of the API.
118 */
119 static inline cds_wfcq_head_ptr_t cds_wfcq_head_cast(struct cds_wfcq_head *head)
120 {
121 cds_wfcq_head_ptr_t ret = { .h = head };
122 return ret;
123 }
124 #endif /* #else #ifndef __cplusplus */
125
126 struct cds_wfcq_tail {
127 struct cds_wfcq_node *p;
128 };
129
130 #ifdef _LGPL_SOURCE
131
132 #include <urcu/static/wfcqueue.h>
133
134 #define cds_wfcq_node_init _cds_wfcq_node_init
135 #define cds_wfcq_init _cds_wfcq_init
136 #define __cds_wfcq_init ___cds_wfcq_init
137 #define cds_wfcq_destroy _cds_wfcq_destroy
138 #define cds_wfcq_empty _cds_wfcq_empty
139 #define cds_wfcq_enqueue _cds_wfcq_enqueue
140
141 /* Dequeue locking */
142 #define cds_wfcq_dequeue_lock _cds_wfcq_dequeue_lock
143 #define cds_wfcq_dequeue_unlock _cds_wfcq_dequeue_unlock
144
145 /* Locking performed within cds_wfcq calls. */
146 #define cds_wfcq_dequeue_blocking _cds_wfcq_dequeue_blocking
147 #define cds_wfcq_dequeue_with_state_blocking \
148 _cds_wfcq_dequeue_with_state_blocking
149 #define cds_wfcq_splice_blocking _cds_wfcq_splice_blocking
150 #define cds_wfcq_first_blocking _cds_wfcq_first_blocking
151 #define cds_wfcq_next_blocking _cds_wfcq_next_blocking
152
153 /* Locking ensured by caller by holding cds_wfcq_dequeue_lock() */
154 #define __cds_wfcq_dequeue_blocking ___cds_wfcq_dequeue_blocking
155 #define __cds_wfcq_dequeue_with_state_blocking \
156 ___cds_wfcq_dequeue_with_state_blocking
157 #define __cds_wfcq_splice_blocking ___cds_wfcq_splice_blocking
158 #define __cds_wfcq_first_blocking ___cds_wfcq_first_blocking
159 #define __cds_wfcq_next_blocking ___cds_wfcq_next_blocking
160
161 /*
162 * Locking ensured by caller by holding cds_wfcq_dequeue_lock().
163 * Non-blocking: deque, first, next return CDS_WFCQ_WOULDBLOCK if they
164 * need to block. splice returns nonzero if it needs to block.
165 */
166 #define __cds_wfcq_dequeue_nonblocking ___cds_wfcq_dequeue_nonblocking
167 #define __cds_wfcq_dequeue_with_state_nonblocking \
168 ___cds_wfcq_dequeue_with_state_nonblocking
169 #define __cds_wfcq_splice_nonblocking ___cds_wfcq_splice_nonblocking
170 #define __cds_wfcq_first_nonblocking ___cds_wfcq_first_nonblocking
171 #define __cds_wfcq_next_nonblocking ___cds_wfcq_next_nonblocking
172
173 #else /* !_LGPL_SOURCE */
174
175 /*
176 * Mutual exclusion of cds_wfcq_* / __cds_wfcq_* API
177 *
178 * Synchronization table:
179 *
180 * External synchronization techniques described in the API below is
181 * required between pairs marked with "X". No external synchronization
182 * required between pairs marked with "-".
183 *
184 * Legend:
185 * [1] cds_wfcq_enqueue
186 * [2] __cds_wfcq_splice (destination queue)
187 * [3] __cds_wfcq_dequeue
188 * [4] __cds_wfcq_splice (source queue)
189 * [5] __cds_wfcq_first
190 * [6] __cds_wfcq_next
191 *
192 * [1] [2] [3] [4] [5] [6]
193 * [1] - - - - - -
194 * [2] - - - - - -
195 * [3] - - X X X X
196 * [4] - - X - X X
197 * [5] - - X X - -
198 * [6] - - X X - -
199 *
200 * Mutual exclusion can be ensured by holding cds_wfcq_dequeue_lock().
201 *
202 * For convenience, cds_wfcq_dequeue_blocking() and
203 * cds_wfcq_splice_blocking() hold the dequeue lock.
204 *
205 * Besides locking, mutual exclusion of dequeue, splice and iteration
206 * can be ensured by performing all of those operations from a single
207 * thread, without requiring any lock.
208 */
209
210 /*
211 * cds_wfcq_node_init: initialize wait-free queue node.
212 */
213 extern void cds_wfcq_node_init(struct cds_wfcq_node *node);
214
215 /*
216 * cds_wfcq_init: initialize wait-free queue. Pair with
217 * cds_wfcq_destroy().
218 */
219 extern void cds_wfcq_init(struct cds_wfcq_head *head,
220 struct cds_wfcq_tail *tail);
221
222 /*
223 * cds_wfcq_destroy: destroy wait-free queue. Pair with
224 * cds_wfcq_init().
225 */
226 extern void cds_wfcq_destroy(struct cds_wfcq_head *head,
227 struct cds_wfcq_tail *tail);
228
229 /*
230 * __cds_wfcq_init: initialize wait-free queue (without lock). Don't
231 * pair with any destroy function.
232 */
233 extern void __cds_wfcq_init(struct __cds_wfcq_head *head,
234 struct cds_wfcq_tail *tail);
235
236 /*
237 * cds_wfcq_empty: return whether wait-free queue is empty.
238 *
239 * No memory barrier is issued. No mutual exclusion is required.
240 */
241 extern bool cds_wfcq_empty(cds_wfcq_head_ptr_t head,
242 struct cds_wfcq_tail *tail);
243
244 /*
245 * cds_wfcq_dequeue_lock: take the dequeue mutual exclusion lock.
246 */
247 extern void cds_wfcq_dequeue_lock(struct cds_wfcq_head *head,
248 struct cds_wfcq_tail *tail);
249
250 /*
251 * cds_wfcq_dequeue_unlock: release the dequeue mutual exclusion lock.
252 */
253 extern void cds_wfcq_dequeue_unlock(struct cds_wfcq_head *head,
254 struct cds_wfcq_tail *tail);
255
256 /*
257 * cds_wfcq_enqueue: enqueue a node into a wait-free queue.
258 *
259 * Issues a full memory barrier before enqueue. No mutual exclusion is
260 * required.
261 *
262 * Returns false if the queue was empty prior to adding the node.
263 * Returns true otherwise.
264 */
265 extern bool cds_wfcq_enqueue(cds_wfcq_head_ptr_t head,
266 struct cds_wfcq_tail *tail,
267 struct cds_wfcq_node *node);
268
269 /*
270 * cds_wfcq_dequeue_blocking: dequeue a node from a wait-free queue.
271 *
272 * Content written into the node before enqueue is guaranteed to be
273 * consistent, but no other memory ordering is ensured.
274 * It is valid to reuse and free a dequeued node immediately.
275 * Mutual exclusion with cds_wfcq_dequeue_blocking and dequeue lock is
276 * ensured.
277 */
278 extern struct cds_wfcq_node *cds_wfcq_dequeue_blocking(
279 struct cds_wfcq_head *head,
280 struct cds_wfcq_tail *tail);
281
282 /*
283 * cds_wfcq_dequeue_with_state_blocking: dequeue with state.
284 *
285 * Same as cds_wfcq_dequeue_blocking, but saves whether dequeueing the
286 * last node of the queue into state (CDS_WFCQ_STATE_LAST).
287 */
288 extern struct cds_wfcq_node *cds_wfcq_dequeue_with_state_blocking(
289 struct cds_wfcq_head *head,
290 struct cds_wfcq_tail *tail,
291 int *state);
292
293 /*
294 * cds_wfcq_splice_blocking: enqueue all src_q nodes at the end of dest_q.
295 *
296 * Dequeue all nodes from src_q.
297 * dest_q must be already initialized.
298 * Content written into the node before enqueue is guaranteed to be
299 * consistent, but no other memory ordering is ensured.
300 * Mutual exclusion with cds_wfcq_dequeue_blocking and dequeue lock is
301 * ensured.
302 *
303 * Returns enum cds_wfcq_ret which indicates the state of the src or
304 * dest queue.
305 */
306 extern enum cds_wfcq_ret cds_wfcq_splice_blocking(
307 struct cds_wfcq_head *dest_q_head,
308 struct cds_wfcq_tail *dest_q_tail,
309 struct cds_wfcq_head *src_q_head,
310 struct cds_wfcq_tail *src_q_tail);
311
312 /*
313 * __cds_wfcq_dequeue_blocking: dequeue a node from a wait-free queue.
314 *
315 * Content written into the node before enqueue is guaranteed to be
316 * consistent, but no other memory ordering is ensured.
317 * It is valid to reuse and free a dequeued node immediately.
318 * Dequeue/splice/iteration mutual exclusion should be ensured by the
319 * caller.
320 */
321 extern struct cds_wfcq_node *__cds_wfcq_dequeue_blocking(
322 cds_wfcq_head_ptr_t head,
323 struct cds_wfcq_tail *tail);
324
325 /*
326 * __cds_wfcq_dequeue_with_state_blocking: dequeue with state.
327 *
328 * Same as __cds_wfcq_dequeue_blocking, but saves whether dequeueing the
329 * last node of the queue into state (CDS_WFCQ_STATE_LAST).
330 */
331 extern struct cds_wfcq_node *__cds_wfcq_dequeue_with_state_blocking(
332 cds_wfcq_head_ptr_t head,
333 struct cds_wfcq_tail *tail,
334 int *state);
335
336 /*
337 * __cds_wfcq_dequeue_nonblocking: dequeue a node from a wait-free queue.
338 *
339 * Same as __cds_wfcq_dequeue_blocking, but returns CDS_WFCQ_WOULDBLOCK
340 * if it needs to block.
341 */
342 extern struct cds_wfcq_node *__cds_wfcq_dequeue_nonblocking(
343 cds_wfcq_head_ptr_t head,
344 struct cds_wfcq_tail *tail);
345
346 /*
347 * __cds_wfcq_dequeue_with_state_blocking: dequeue with state.
348 *
349 * Same as __cds_wfcq_dequeue_nonblocking, but saves whether dequeueing
350 * the last node of the queue into state (CDS_WFCQ_STATE_LAST).
351 */
352 extern struct cds_wfcq_node *__cds_wfcq_dequeue_with_state_nonblocking(
353 cds_wfcq_head_ptr_t head,
354 struct cds_wfcq_tail *tail,
355 int *state);
356
357 /*
358 * __cds_wfcq_splice_blocking: enqueue all src_q nodes at the end of dest_q.
359 *
360 * Dequeue all nodes from src_q.
361 * dest_q must be already initialized.
362 * Mutual exclusion for src_q should be ensured by the caller as
363 * specified in the "Synchronisation table".
364 * Returns enum cds_wfcq_ret which indicates the state of the src or
365 * dest queue. Never returns CDS_WFCQ_RET_WOULDBLOCK.
366 */
367 extern enum cds_wfcq_ret __cds_wfcq_splice_blocking(
368 cds_wfcq_head_ptr_t dest_q_head,
369 struct cds_wfcq_tail *dest_q_tail,
370 cds_wfcq_head_ptr_t src_q_head,
371 struct cds_wfcq_tail *src_q_tail);
372
373 /*
374 * __cds_wfcq_splice_nonblocking: enqueue all src_q nodes at the end of dest_q.
375 *
376 * Same as __cds_wfcq_splice_blocking, but returns
377 * CDS_WFCQ_RET_WOULDBLOCK if it needs to block.
378 */
379 extern enum cds_wfcq_ret __cds_wfcq_splice_nonblocking(
380 cds_wfcq_head_ptr_t dest_q_head,
381 struct cds_wfcq_tail *dest_q_tail,
382 cds_wfcq_head_ptr_t src_q_head,
383 struct cds_wfcq_tail *src_q_tail);
384
385 /*
386 * __cds_wfcq_first_blocking: get first node of a queue, without dequeuing.
387 *
388 * Content written into the node before enqueue is guaranteed to be
389 * consistent, but no other memory ordering is ensured.
390 * Dequeue/splice/iteration mutual exclusion should be ensured by the
391 * caller.
392 *
393 * Used by for-like iteration macros:
394 * __cds_wfcq_for_each_blocking()
395 * __cds_wfcq_for_each_blocking_safe()
396 *
397 * Returns NULL if queue is empty, first node otherwise.
398 */
399 extern struct cds_wfcq_node *__cds_wfcq_first_blocking(
400 cds_wfcq_head_ptr_t head,
401 struct cds_wfcq_tail *tail);
402
403 /*
404 * __cds_wfcq_first_nonblocking: get first node of a queue, without dequeuing.
405 *
406 * Same as __cds_wfcq_first_blocking, but returns CDS_WFCQ_WOULDBLOCK if
407 * it needs to block.
408 */
409 extern struct cds_wfcq_node *__cds_wfcq_first_nonblocking(
410 cds_wfcq_head_ptr_t head,
411 struct cds_wfcq_tail *tail);
412
413 /*
414 * __cds_wfcq_next_blocking: get next node of a queue, without dequeuing.
415 *
416 * Content written into the node before enqueue is guaranteed to be
417 * consistent, but no other memory ordering is ensured.
418 * Dequeue/splice/iteration mutual exclusion should be ensured by the
419 * caller.
420 *
421 * Used by for-like iteration macros:
422 * __cds_wfcq_for_each_blocking()
423 * __cds_wfcq_for_each_blocking_safe()
424 *
425 * Returns NULL if reached end of queue, non-NULL next queue node
426 * otherwise.
427 */
428 extern struct cds_wfcq_node *__cds_wfcq_next_blocking(
429 cds_wfcq_head_ptr_t head,
430 struct cds_wfcq_tail *tail,
431 struct cds_wfcq_node *node);
432
433 /*
434 * __cds_wfcq_next_blocking: get next node of a queue, without dequeuing.
435 *
436 * Same as __cds_wfcq_next_blocking, but returns CDS_WFCQ_WOULDBLOCK if
437 * it needs to block.
438 */
439 extern struct cds_wfcq_node *__cds_wfcq_next_nonblocking(
440 cds_wfcq_head_ptr_t head,
441 struct cds_wfcq_tail *tail,
442 struct cds_wfcq_node *node);
443
444 #endif /* !_LGPL_SOURCE */
445
446 /*
447 * __cds_wfcq_for_each_blocking: Iterate over all nodes in a queue,
448 * without dequeuing them.
449 * @head: head of the queue (struct cds_wfcq_head or __cds_wfcq_head pointer).
450 * @tail: tail of the queue (struct cds_wfcq_tail pointer).
451 * @node: iterator on the queue (struct cds_wfcq_node pointer).
452 *
453 * Content written into each node before enqueue is guaranteed to be
454 * consistent, but no other memory ordering is ensured.
455 * Dequeue/splice/iteration mutual exclusion should be ensured by the
456 * caller.
457 */
458 #define __cds_wfcq_for_each_blocking(head, tail, node) \
459 for (node = __cds_wfcq_first_blocking(head, tail); \
460 node != NULL; \
461 node = __cds_wfcq_next_blocking(head, tail, node))
462
463 /*
464 * __cds_wfcq_for_each_blocking_safe: Iterate over all nodes in a queue,
465 * without dequeuing them. Safe against deletion.
466 * @head: head of the queue (struct cds_wfcq_head or __cds_wfcq_head pointer).
467 * @tail: tail of the queue (struct cds_wfcq_tail pointer).
468 * @node: iterator on the queue (struct cds_wfcq_node pointer).
469 * @n: struct cds_wfcq_node pointer holding the next pointer (used
470 * internally).
471 *
472 * Content written into each node before enqueue is guaranteed to be
473 * consistent, but no other memory ordering is ensured.
474 * Dequeue/splice/iteration mutual exclusion should be ensured by the
475 * caller.
476 */
477 #define __cds_wfcq_for_each_blocking_safe(head, tail, node, n) \
478 for (node = __cds_wfcq_first_blocking(head, tail), \
479 n = (node ? __cds_wfcq_next_blocking(head, tail, node) : NULL); \
480 node != NULL; \
481 node = n, n = (node ? __cds_wfcq_next_blocking(head, tail, node) : NULL))
482
483 #ifdef __cplusplus
484 }
485
486 /*
487 * In C++, implement static inline wrappers using function overloading
488 * to obtain an API similar to C.
489 */
490
491 static inline cds_wfcq_head_ptr_t cds_wfcq_head_cast_cpp(struct __cds_wfcq_head *head)
492 {
493 cds_wfcq_head_ptr_t ret = { ._h = head };
494 return ret;
495 }
496
497 static inline cds_wfcq_head_ptr_t cds_wfcq_head_cast_cpp(struct cds_wfcq_head *head)
498 {
499 cds_wfcq_head_ptr_t ret = { .h = head };
500 return ret;
501 }
502
503 template<typename T> static inline bool cds_wfcq_empty(T head,
504 struct cds_wfcq_tail *tail)
505 {
506 return cds_wfcq_empty(cds_wfcq_head_cast_cpp(head), tail);
507 }
508
509 template<typename T> static inline bool cds_wfcq_enqueue(T head,
510 struct cds_wfcq_tail *tail,
511 struct cds_wfcq_node *node)
512 {
513 return cds_wfcq_enqueue(cds_wfcq_head_cast_cpp(head), tail, node);
514 }
515
516 template<typename T> static inline struct cds_wfcq_node *__cds_wfcq_dequeue_blocking(
517 T head, struct cds_wfcq_tail *tail)
518 {
519 return __cds_wfcq_dequeue_blocking(cds_wfcq_head_cast_cpp(head), tail);
520 }
521
522 template<typename T> static inline struct cds_wfcq_node *__cds_wfcq_dequeue_with_state_blocking(
523 T head, struct cds_wfcq_tail *tail, int *state)
524 {
525 return __cds_wfcq_dequeue_with_state_blocking(cds_wfcq_head_cast_cpp(head),
526 tail, state);
527 }
528
529 template<typename T> static inline struct cds_wfcq_node *__cds_wfcq_dequeue_nonblocking(
530 T head, struct cds_wfcq_tail *tail)
531 {
532 return __cds_wfcq_dequeue_nonblocking(cds_wfcq_head_cast_cpp(head), tail);
533 }
534
535 template<typename T> static inline struct cds_wfcq_node *__cds_wfcq_dequeue_with_state_nonblocking(
536 T head, struct cds_wfcq_tail *tail, int *state)
537 {
538 return __cds_wfcq_dequeue_with_state_nonblocking(cds_wfcq_head_cast_cpp(head),
539 tail, state);
540 }
541
542 template<typename T, typename U> static inline enum cds_wfcq_ret __cds_wfcq_splice_blocking(
543 T dest_q_head,
544 struct cds_wfcq_tail *dest_q_tail,
545 U src_q_head,
546 struct cds_wfcq_tail *src_q_tail)
547 {
548 return __cds_wfcq_splice_blocking(cds_wfcq_head_cast_cpp(dest_q_head),
549 dest_q_tail,
550 cds_wfcq_head_cast_cpp(src_q_head),
551 src_q_tail);
552 }
553
554 template<typename T, typename U> static inline enum cds_wfcq_ret __cds_wfcq_splice_nonblocking(
555 T dest_q_head,
556 struct cds_wfcq_tail *dest_q_tail,
557 U *src_q_head,
558 struct cds_wfcq_tail *src_q_tail)
559 {
560 return __cds_wfcq_splice_nonblocking(cds_wfcq_head_cast_cpp(dest_q_head),
561 dest_q_tail,
562 cds_wfcq_head_cast_cpp(src_q_head),
563 src_q_tail);
564 }
565
566 template<typename T> static inline struct cds_wfcq_node *__cds_wfcq_first_blocking(
567 T head, struct cds_wfcq_tail *tail)
568 {
569 return __cds_wfcq_first_blocking(cds_wfcq_head_cast_cpp(head), tail);
570 }
571
572 template<typename T> static inline struct cds_wfcq_node *__cds_wfcq_first_nonblocking(
573 T head, struct cds_wfcq_tail *tail)
574 {
575 return __cds_wfcq_first_nonblocking(cds_wfcq_head_cast_cpp(head), tail);
576 }
577
578 template<typename T> static inline struct cds_wfcq_node *__cds_wfcq_next_blocking(
579 T head,
580 struct cds_wfcq_tail *tail,
581 struct cds_wfcq_node *node)
582 {
583 return __cds_wfcq_next_blocking(cds_wfcq_head_cast_cpp(head), tail, node);
584 }
585
586 template<typename T> static inline struct cds_wfcq_node *__cds_wfcq_next_nonblocking(
587 T head,
588 struct cds_wfcq_tail *tail,
589 struct cds_wfcq_node *node)
590 {
591 return __cds_wfcq_next_nonblocking(cds_wfcq_head_cast_cpp(head), tail, node);
592 }
593
594 #endif
595
596 #endif /* _URCU_WFCQUEUE_H */
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