Fix: auto-resize hash table destroy deadlock
[urcu.git] / src / urcu.c
1 /*
2 * urcu.c
3 *
4 * Userspace RCU library
5 *
6 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 *
23 * IBM's contributions to this file may be relicensed under LGPLv2 or later.
24 */
25
26 #define URCU_NO_COMPAT_IDENTIFIERS
27 #define _BSD_SOURCE
28 #define _LGPL_SOURCE
29 #define _DEFAULT_SOURCE
30 #include <stdio.h>
31 #include <pthread.h>
32 #include <signal.h>
33 #include <stdlib.h>
34 #include <stdint.h>
35 #include <string.h>
36 #include <errno.h>
37 #include <stdbool.h>
38 #include <poll.h>
39
40 #include <urcu/config.h>
41 #include <urcu/assert.h>
42 #include <urcu/arch.h>
43 #include <urcu/wfcqueue.h>
44 #include <urcu/map/urcu.h>
45 #include <urcu/static/urcu.h>
46 #include <urcu/pointer.h>
47 #include <urcu/tls-compat.h>
48
49 #include "urcu-die.h"
50 #include "urcu-wait.h"
51 #include "urcu-utils.h"
52
53 #define URCU_API_MAP
54 /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
55 #undef _LGPL_SOURCE
56 #include <urcu/urcu.h>
57 #define _LGPL_SOURCE
58
59 /*
60 * If a reader is really non-cooperative and refuses to commit its
61 * rcu_active_readers count to memory (there is no barrier in the reader
62 * per-se), kick it after 10 loops waiting for it.
63 */
64 #define KICK_READER_LOOPS 10
65
66 /*
67 * Active attempts to check for reader Q.S. before calling futex().
68 */
69 #define RCU_QS_ACTIVE_ATTEMPTS 100
70
71 /* If the headers do not support membarrier system call, fall back on RCU_MB */
72 #ifdef __NR_membarrier
73 # define membarrier(...) syscall(__NR_membarrier, __VA_ARGS__)
74 #else
75 # define membarrier(...) -ENOSYS
76 #endif
77
78 enum membarrier_cmd {
79 MEMBARRIER_CMD_QUERY = 0,
80 MEMBARRIER_CMD_SHARED = (1 << 0),
81 /* reserved for MEMBARRIER_CMD_SHARED_EXPEDITED (1 << 1) */
82 /* reserved for MEMBARRIER_CMD_PRIVATE (1 << 2) */
83 MEMBARRIER_CMD_PRIVATE_EXPEDITED = (1 << 3),
84 MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED = (1 << 4),
85 };
86
87 #ifdef RCU_MEMBARRIER
88 static int init_done;
89 static int urcu_memb_has_sys_membarrier_private_expedited;
90
91 #ifndef CONFIG_RCU_FORCE_SYS_MEMBARRIER
92 /*
93 * Explicitly initialize to zero because we can't alias a non-static
94 * uninitialized variable.
95 */
96 int urcu_memb_has_sys_membarrier = 0;
97 #endif
98
99 void __attribute__((constructor)) rcu_init(void);
100 #endif
101
102 #ifdef RCU_MB
103 void rcu_init(void)
104 {
105 }
106 #endif
107
108 #ifdef RCU_SIGNAL
109 static int init_done;
110
111 void __attribute__((constructor)) rcu_init(void);
112 void __attribute__((destructor)) rcu_exit(void);
113
114 static DEFINE_URCU_TLS(int, rcu_signal_was_blocked);
115 #endif
116
117 /*
118 * rcu_gp_lock ensures mutual exclusion between threads calling
119 * synchronize_rcu().
120 */
121 static pthread_mutex_t rcu_gp_lock = PTHREAD_MUTEX_INITIALIZER;
122 /*
123 * rcu_registry_lock ensures mutual exclusion between threads
124 * registering and unregistering themselves to/from the registry, and
125 * with threads reading that registry from synchronize_rcu(). However,
126 * this lock is not held all the way through the completion of awaiting
127 * for the grace period. It is sporadically released between iterations
128 * on the registry.
129 * rcu_registry_lock may nest inside rcu_gp_lock.
130 */
131 static pthread_mutex_t rcu_registry_lock = PTHREAD_MUTEX_INITIALIZER;
132 struct urcu_gp rcu_gp = { .ctr = URCU_GP_COUNT };
133
134 /*
135 * Written to only by each individual reader. Read by both the reader and the
136 * writers.
137 */
138 DEFINE_URCU_TLS(struct urcu_reader, rcu_reader);
139
140 static CDS_LIST_HEAD(registry);
141
142 /*
143 * Queue keeping threads awaiting to wait for a grace period. Contains
144 * struct gp_waiters_thread objects.
145 */
146 static DEFINE_URCU_WAIT_QUEUE(gp_waiters);
147
148 static void mutex_lock(pthread_mutex_t *mutex)
149 {
150 int ret;
151
152 #ifndef DISTRUST_SIGNALS_EXTREME
153 ret = pthread_mutex_lock(mutex);
154 if (ret)
155 urcu_die(ret);
156 #else /* #ifndef DISTRUST_SIGNALS_EXTREME */
157 while ((ret = pthread_mutex_trylock(mutex)) != 0) {
158 if (ret != EBUSY && ret != EINTR)
159 urcu_die(ret);
160 if (CMM_LOAD_SHARED(URCU_TLS(rcu_reader).need_mb)) {
161 cmm_smp_mb();
162 _CMM_STORE_SHARED(URCU_TLS(rcu_reader).need_mb, 0);
163 cmm_smp_mb();
164 }
165 (void) poll(NULL, 0, 10);
166 }
167 #endif /* #else #ifndef DISTRUST_SIGNALS_EXTREME */
168 }
169
170 static void mutex_unlock(pthread_mutex_t *mutex)
171 {
172 int ret;
173
174 ret = pthread_mutex_unlock(mutex);
175 if (ret)
176 urcu_die(ret);
177 }
178
179 #ifdef RCU_MEMBARRIER
180 static void smp_mb_master(void)
181 {
182 if (caa_likely(urcu_memb_has_sys_membarrier)) {
183 if (membarrier(urcu_memb_has_sys_membarrier_private_expedited ?
184 MEMBARRIER_CMD_PRIVATE_EXPEDITED :
185 MEMBARRIER_CMD_SHARED, 0))
186 urcu_die(errno);
187 } else {
188 cmm_smp_mb();
189 }
190 }
191 #endif
192
193 #ifdef RCU_MB
194 static void smp_mb_master(void)
195 {
196 cmm_smp_mb();
197 }
198 #endif
199
200 #ifdef RCU_SIGNAL
201 static void force_mb_all_readers(void)
202 {
203 struct urcu_reader *index;
204
205 /*
206 * Ask for each threads to execute a cmm_smp_mb() so we can consider the
207 * compiler barriers around rcu read lock as real memory barriers.
208 */
209 if (cds_list_empty(&registry))
210 return;
211 /*
212 * pthread_kill has a cmm_smp_mb(). But beware, we assume it performs
213 * a cache flush on architectures with non-coherent cache. Let's play
214 * safe and don't assume anything : we use cmm_smp_mc() to make sure the
215 * cache flush is enforced.
216 */
217 cds_list_for_each_entry(index, &registry, node) {
218 CMM_STORE_SHARED(index->need_mb, 1);
219 pthread_kill(index->tid, SIGRCU);
220 }
221 /*
222 * Wait for sighandler (and thus mb()) to execute on every thread.
223 *
224 * Note that the pthread_kill() will never be executed on systems
225 * that correctly deliver signals in a timely manner. However, it
226 * is not uncommon for kernels to have bugs that can result in
227 * lost or unduly delayed signals.
228 *
229 * If you are seeing the below pthread_kill() executing much at
230 * all, we suggest testing the underlying kernel and filing the
231 * relevant bug report. For Linux kernels, we recommend getting
232 * the Linux Test Project (LTP).
233 */
234 cds_list_for_each_entry(index, &registry, node) {
235 while (CMM_LOAD_SHARED(index->need_mb)) {
236 pthread_kill(index->tid, SIGRCU);
237 (void) poll(NULL, 0, 1);
238 }
239 }
240 cmm_smp_mb(); /* read ->need_mb before ending the barrier */
241 }
242
243 static void smp_mb_master(void)
244 {
245 force_mb_all_readers();
246 }
247 #endif /* #ifdef RCU_SIGNAL */
248
249 /*
250 * synchronize_rcu() waiting. Single thread.
251 * Always called with rcu_registry lock held. Releases this lock and
252 * grabs it again. Holds the lock when it returns.
253 */
254 static void wait_gp(void)
255 {
256 /*
257 * Read reader_gp before read futex. smp_mb_master() needs to
258 * be called with the rcu registry lock held in RCU_SIGNAL
259 * flavor.
260 */
261 smp_mb_master();
262 /* Temporarily unlock the registry lock. */
263 mutex_unlock(&rcu_registry_lock);
264 while (uatomic_read(&rcu_gp.futex) == -1) {
265 if (!futex_async(&rcu_gp.futex, FUTEX_WAIT, -1, NULL, NULL, 0)) {
266 /*
267 * Prior queued wakeups queued by unrelated code
268 * using the same address can cause futex wait to
269 * return 0 even through the futex value is still
270 * -1 (spurious wakeups). Check the value again
271 * in user-space to validate whether it really
272 * differs from -1.
273 */
274 continue;
275 }
276 switch (errno) {
277 case EAGAIN:
278 /* Value already changed. */
279 goto end;
280 case EINTR:
281 /* Retry if interrupted by signal. */
282 break; /* Get out of switch. Check again. */
283 default:
284 /* Unexpected error. */
285 urcu_die(errno);
286 }
287 }
288 end:
289 /*
290 * Re-lock the registry lock before the next loop.
291 */
292 mutex_lock(&rcu_registry_lock);
293 }
294
295 /*
296 * Always called with rcu_registry lock held. Releases this lock between
297 * iterations and grabs it again. Holds the lock when it returns.
298 */
299 static void wait_for_readers(struct cds_list_head *input_readers,
300 struct cds_list_head *cur_snap_readers,
301 struct cds_list_head *qsreaders)
302 {
303 unsigned int wait_loops = 0;
304 struct urcu_reader *index, *tmp;
305 #ifdef HAS_INCOHERENT_CACHES
306 unsigned int wait_gp_loops = 0;
307 #endif /* HAS_INCOHERENT_CACHES */
308
309 /*
310 * Wait for each thread URCU_TLS(rcu_reader).ctr to either
311 * indicate quiescence (not nested), or observe the current
312 * rcu_gp.ctr value.
313 */
314 for (;;) {
315 if (wait_loops < RCU_QS_ACTIVE_ATTEMPTS)
316 wait_loops++;
317 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
318 uatomic_dec(&rcu_gp.futex);
319 /* Write futex before read reader_gp */
320 smp_mb_master();
321 }
322
323 cds_list_for_each_entry_safe(index, tmp, input_readers, node) {
324 switch (urcu_common_reader_state(&rcu_gp, &index->ctr)) {
325 case URCU_READER_ACTIVE_CURRENT:
326 if (cur_snap_readers) {
327 cds_list_move(&index->node,
328 cur_snap_readers);
329 break;
330 }
331 /* Fall-through */
332 case URCU_READER_INACTIVE:
333 cds_list_move(&index->node, qsreaders);
334 break;
335 case URCU_READER_ACTIVE_OLD:
336 /*
337 * Old snapshot. Leaving node in
338 * input_readers will make us busy-loop
339 * until the snapshot becomes current or
340 * the reader becomes inactive.
341 */
342 break;
343 }
344 }
345
346 #ifndef HAS_INCOHERENT_CACHES
347 if (cds_list_empty(input_readers)) {
348 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
349 /* Read reader_gp before write futex */
350 smp_mb_master();
351 uatomic_set(&rcu_gp.futex, 0);
352 }
353 break;
354 } else {
355 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
356 /* wait_gp unlocks/locks registry lock. */
357 wait_gp();
358 } else {
359 /* Temporarily unlock the registry lock. */
360 mutex_unlock(&rcu_registry_lock);
361 caa_cpu_relax();
362 /*
363 * Re-lock the registry lock before the
364 * next loop.
365 */
366 mutex_lock(&rcu_registry_lock);
367 }
368 }
369 #else /* #ifndef HAS_INCOHERENT_CACHES */
370 /*
371 * BUSY-LOOP. Force the reader thread to commit its
372 * URCU_TLS(rcu_reader).ctr update to memory if we wait
373 * for too long.
374 */
375 if (cds_list_empty(input_readers)) {
376 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
377 /* Read reader_gp before write futex */
378 smp_mb_master();
379 uatomic_set(&rcu_gp.futex, 0);
380 }
381 break;
382 } else {
383 if (wait_gp_loops == KICK_READER_LOOPS) {
384 smp_mb_master();
385 wait_gp_loops = 0;
386 }
387 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
388 /* wait_gp unlocks/locks registry lock. */
389 wait_gp();
390 wait_gp_loops++;
391 } else {
392 /* Temporarily unlock the registry lock. */
393 mutex_unlock(&rcu_registry_lock);
394 caa_cpu_relax();
395 /*
396 * Re-lock the registry lock before the
397 * next loop.
398 */
399 mutex_lock(&rcu_registry_lock);
400 }
401 }
402 #endif /* #else #ifndef HAS_INCOHERENT_CACHES */
403 }
404 }
405
406 void synchronize_rcu(void)
407 {
408 CDS_LIST_HEAD(cur_snap_readers);
409 CDS_LIST_HEAD(qsreaders);
410 DEFINE_URCU_WAIT_NODE(wait, URCU_WAIT_WAITING);
411 struct urcu_waiters waiters;
412
413 /*
414 * Add ourself to gp_waiters queue of threads awaiting to wait
415 * for a grace period. Proceed to perform the grace period only
416 * if we are the first thread added into the queue.
417 * The implicit memory barrier before urcu_wait_add()
418 * orders prior memory accesses of threads put into the wait
419 * queue before their insertion into the wait queue.
420 */
421 if (urcu_wait_add(&gp_waiters, &wait) != 0) {
422 /* Not first in queue: will be awakened by another thread. */
423 urcu_adaptative_busy_wait(&wait);
424 /* Order following memory accesses after grace period. */
425 cmm_smp_mb();
426 return;
427 }
428 /* We won't need to wake ourself up */
429 urcu_wait_set_state(&wait, URCU_WAIT_RUNNING);
430
431 mutex_lock(&rcu_gp_lock);
432
433 /*
434 * Move all waiters into our local queue.
435 */
436 urcu_move_waiters(&waiters, &gp_waiters);
437
438 mutex_lock(&rcu_registry_lock);
439
440 if (cds_list_empty(&registry))
441 goto out;
442
443 /*
444 * All threads should read qparity before accessing data structure
445 * where new ptr points to. Must be done within rcu_registry_lock
446 * because it iterates on reader threads.
447 */
448 /* Write new ptr before changing the qparity */
449 smp_mb_master();
450
451 /*
452 * Wait for readers to observe original parity or be quiescent.
453 * wait_for_readers() can release and grab again rcu_registry_lock
454 * internally.
455 */
456 wait_for_readers(&registry, &cur_snap_readers, &qsreaders);
457
458 /*
459 * Must finish waiting for quiescent state for original parity before
460 * committing next rcu_gp.ctr update to memory. Failure to do so could
461 * result in the writer waiting forever while new readers are always
462 * accessing data (no progress). Enforce compiler-order of load
463 * URCU_TLS(rcu_reader).ctr before store to rcu_gp.ctr.
464 */
465 cmm_barrier();
466
467 /*
468 * Adding a cmm_smp_mb() which is _not_ formally required, but makes the
469 * model easier to understand. It does not have a big performance impact
470 * anyway, given this is the write-side.
471 */
472 cmm_smp_mb();
473
474 /* Switch parity: 0 -> 1, 1 -> 0 */
475 CMM_STORE_SHARED(rcu_gp.ctr, rcu_gp.ctr ^ URCU_GP_CTR_PHASE);
476
477 /*
478 * Must commit rcu_gp.ctr update to memory before waiting for quiescent
479 * state. Failure to do so could result in the writer waiting forever
480 * while new readers are always accessing data (no progress). Enforce
481 * compiler-order of store to rcu_gp.ctr before load rcu_reader ctr.
482 */
483 cmm_barrier();
484
485 /*
486 *
487 * Adding a cmm_smp_mb() which is _not_ formally required, but makes the
488 * model easier to understand. It does not have a big performance impact
489 * anyway, given this is the write-side.
490 */
491 cmm_smp_mb();
492
493 /*
494 * Wait for readers to observe new parity or be quiescent.
495 * wait_for_readers() can release and grab again rcu_registry_lock
496 * internally.
497 */
498 wait_for_readers(&cur_snap_readers, NULL, &qsreaders);
499
500 /*
501 * Put quiescent reader list back into registry.
502 */
503 cds_list_splice(&qsreaders, &registry);
504
505 /*
506 * Finish waiting for reader threads before letting the old ptr
507 * being freed. Must be done within rcu_registry_lock because it
508 * iterates on reader threads.
509 */
510 smp_mb_master();
511 out:
512 mutex_unlock(&rcu_registry_lock);
513 mutex_unlock(&rcu_gp_lock);
514
515 /*
516 * Wakeup waiters only after we have completed the grace period
517 * and have ensured the memory barriers at the end of the grace
518 * period have been issued.
519 */
520 urcu_wake_all_waiters(&waiters);
521 }
522
523 /*
524 * library wrappers to be used by non-LGPL compatible source code.
525 */
526
527 void rcu_read_lock(void)
528 {
529 _rcu_read_lock();
530 }
531
532 void rcu_read_unlock(void)
533 {
534 _rcu_read_unlock();
535 }
536
537 int rcu_read_ongoing(void)
538 {
539 return _rcu_read_ongoing();
540 }
541
542 #ifdef RCU_SIGNAL
543 /*
544 * Make sure the signal used by the urcu-signal flavor is unblocked
545 * while the thread is registered.
546 */
547 static
548 void urcu_signal_unblock(void)
549 {
550 sigset_t mask, oldmask;
551 int ret;
552
553 ret = sigemptyset(&mask);
554 urcu_posix_assert(!ret);
555 ret = sigaddset(&mask, SIGRCU);
556 urcu_posix_assert(!ret);
557 ret = pthread_sigmask(SIG_UNBLOCK, &mask, &oldmask);
558 urcu_posix_assert(!ret);
559 URCU_TLS(rcu_signal_was_blocked) = sigismember(&oldmask, SIGRCU);
560 }
561
562 static
563 void urcu_signal_restore(void)
564 {
565 sigset_t mask;
566 int ret;
567
568 if (!URCU_TLS(rcu_signal_was_blocked))
569 return;
570 ret = sigemptyset(&mask);
571 urcu_posix_assert(!ret);
572 ret = sigaddset(&mask, SIGRCU);
573 urcu_posix_assert(!ret);
574 ret = pthread_sigmask(SIG_BLOCK, &mask, NULL);
575 urcu_posix_assert(!ret);
576 }
577 #else
578 static
579 void urcu_signal_unblock(void) { }
580 static
581 void urcu_signal_restore(void) { }
582 #endif
583
584 void rcu_register_thread(void)
585 {
586 urcu_signal_unblock();
587
588 URCU_TLS(rcu_reader).tid = pthread_self();
589 urcu_posix_assert(URCU_TLS(rcu_reader).need_mb == 0);
590 urcu_posix_assert(!(URCU_TLS(rcu_reader).ctr & URCU_GP_CTR_NEST_MASK));
591
592 mutex_lock(&rcu_registry_lock);
593 urcu_posix_assert(!URCU_TLS(rcu_reader).registered);
594 URCU_TLS(rcu_reader).registered = 1;
595 rcu_init(); /* In case gcc does not support constructor attribute */
596 cds_list_add(&URCU_TLS(rcu_reader).node, &registry);
597 mutex_unlock(&rcu_registry_lock);
598 }
599
600 void rcu_unregister_thread(void)
601 {
602 mutex_lock(&rcu_registry_lock);
603 urcu_posix_assert(URCU_TLS(rcu_reader).registered);
604 URCU_TLS(rcu_reader).registered = 0;
605 cds_list_del(&URCU_TLS(rcu_reader).node);
606 mutex_unlock(&rcu_registry_lock);
607
608 urcu_signal_restore();
609 }
610
611 #ifdef RCU_MEMBARRIER
612
613 #ifdef CONFIG_RCU_FORCE_SYS_MEMBARRIER
614 static
615 void rcu_sys_membarrier_status(bool available)
616 {
617 if (!available)
618 abort();
619 }
620 #else
621 static
622 void rcu_sys_membarrier_status(bool available)
623 {
624 if (!available)
625 return;
626 urcu_memb_has_sys_membarrier = 1;
627 }
628 #endif
629
630 static
631 void rcu_sys_membarrier_init(void)
632 {
633 bool available = false;
634 int mask;
635
636 mask = membarrier(MEMBARRIER_CMD_QUERY, 0);
637 if (mask >= 0) {
638 if (mask & MEMBARRIER_CMD_PRIVATE_EXPEDITED) {
639 if (membarrier(MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED, 0))
640 urcu_die(errno);
641 urcu_memb_has_sys_membarrier_private_expedited = 1;
642 available = true;
643 } else if (mask & MEMBARRIER_CMD_SHARED) {
644 available = true;
645 }
646 }
647 rcu_sys_membarrier_status(available);
648 }
649
650 void rcu_init(void)
651 {
652 if (init_done)
653 return;
654 init_done = 1;
655 rcu_sys_membarrier_init();
656 }
657 #endif
658
659 #ifdef RCU_SIGNAL
660 static void sigrcu_handler(int signo __attribute__((unused)),
661 siginfo_t *siginfo __attribute__((unused)),
662 void *context __attribute__((unused)))
663 {
664 /*
665 * Executing this cmm_smp_mb() is the only purpose of this signal handler.
666 * It punctually promotes cmm_barrier() into cmm_smp_mb() on every thread it is
667 * executed on.
668 */
669 cmm_smp_mb();
670 _CMM_STORE_SHARED(URCU_TLS(rcu_reader).need_mb, 0);
671 cmm_smp_mb();
672 }
673
674 /*
675 * rcu_init constructor. Called when the library is linked, but also when
676 * reader threads are calling rcu_register_thread().
677 * Should only be called by a single thread at a given time. This is ensured by
678 * holing the rcu_registry_lock from rcu_register_thread() or by running
679 * at library load time, which should not be executed by multiple
680 * threads nor concurrently with rcu_register_thread() anyway.
681 */
682 void rcu_init(void)
683 {
684 struct sigaction act;
685 int ret;
686
687 if (init_done)
688 return;
689 init_done = 1;
690
691 act.sa_sigaction = sigrcu_handler;
692 act.sa_flags = SA_SIGINFO | SA_RESTART;
693 sigemptyset(&act.sa_mask);
694 ret = sigaction(SIGRCU, &act, NULL);
695 if (ret)
696 urcu_die(errno);
697 }
698
699 void rcu_exit(void)
700 {
701 /*
702 * Don't unregister the SIGRCU signal handler anymore, because
703 * call_rcu threads could still be using it shortly before the
704 * application exits.
705 * Assertion disabled because call_rcu threads are now rcu
706 * readers, and left running at exit.
707 * urcu_posix_assert(cds_list_empty(&registry));
708 */
709 }
710
711 #endif /* #ifdef RCU_SIGNAL */
712
713 DEFINE_RCU_FLAVOR(rcu_flavor);
714
715 #include "urcu-call-rcu-impl.h"
716 #include "urcu-defer-impl.h"
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