Cleanup: update code layout to fix old gcc warning
[urcu.git] / src / urcu-qsbr.c
CommitLineData
9f1621ca 1/*
7ac06cef 2 * urcu-qsbr.c
9f1621ca 3 *
7ac06cef 4 * Userspace RCU QSBR library
9f1621ca 5 *
6982d6d7 6 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9f1621ca
MD
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
e37faee1 26#define URCU_NO_COMPAT_IDENTIFIERS
71c811bf 27#define _LGPL_SOURCE
9f1621ca
MD
28#include <stdio.h>
29#include <pthread.h>
30#include <signal.h>
31#include <assert.h>
32#include <stdlib.h>
6d841bc2 33#include <stdint.h>
9f1621ca
MD
34#include <string.h>
35#include <errno.h>
36#include <poll.h>
37
4477a870
MD
38#include <urcu/wfcqueue.h>
39#include <urcu/map/urcu-qsbr.h>
727f819d 40#define BUILD_QSBR_LIB
4477a870
MD
41#include <urcu/static/urcu-qsbr.h>
42#include <urcu/pointer.h>
43#include <urcu/tls-compat.h>
71c811bf 44
4a6d7378 45#include "urcu-die.h"
cba82d7b 46#include "urcu-wait.h"
ce28e67a 47#include "urcu-utils.h"
4a6d7378 48
4477a870 49#define URCU_API_MAP
9f1621ca 50/* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
71c811bf 51#undef _LGPL_SOURCE
4477a870 52#include <urcu/urcu-qsbr.h>
71c811bf 53#define _LGPL_SOURCE
9f1621ca 54
4477a870 55void __attribute__((destructor)) urcu_qsbr_exit(void);
f6d18c64 56
731ccb96
MD
57/*
58 * rcu_gp_lock ensures mutual exclusion between threads calling
59 * synchronize_rcu().
60 */
6abb4bd5 61static pthread_mutex_t rcu_gp_lock = PTHREAD_MUTEX_INITIALIZER;
731ccb96
MD
62/*
63 * rcu_registry_lock ensures mutual exclusion between threads
64 * registering and unregistering themselves to/from the registry, and
65 * with threads reading that registry from synchronize_rcu(). However,
66 * this lock is not held all the way through the completion of awaiting
67 * for the grace period. It is sporadically released between iterations
68 * on the registry.
69 * rcu_registry_lock may nest inside rcu_gp_lock.
70 */
71static pthread_mutex_t rcu_registry_lock = PTHREAD_MUTEX_INITIALIZER;
4477a870 72struct urcu_gp urcu_qsbr_gp = { .ctr = URCU_QSBR_GP_ONLINE };
ce28e67a 73URCU_ATTR_ALIAS("urcu_qsbr_gp") extern struct urcu_gp rcu_gp_qsbr;
9f1621ca 74
408f6d92
PB
75/*
76 * Active attempts to check for reader Q.S. before calling futex().
77 */
78#define RCU_QS_ACTIVE_ATTEMPTS 100
79
9f1621ca
MD
80/*
81 * Written to only by each individual reader. Read by both the reader and the
82 * writers.
83 */
4477a870 84DEFINE_URCU_TLS(struct urcu_qsbr_reader, urcu_qsbr_reader);
99bfa9e9 85DEFINE_URCU_TLS_ALIAS(struct urcu_qsbr_reader, urcu_qsbr_reader, rcu_reader_qsbr);
9f1621ca 86
16aa9ee8 87static CDS_LIST_HEAD(registry);
9f1621ca 88
6362f68f 89/*
bf6822a6 90 * Queue keeping threads awaiting to wait for a grace period. Contains
6362f68f
MD
91 * struct gp_waiters_thread objects.
92 */
bf6822a6 93static DEFINE_URCU_WAIT_QUEUE(gp_waiters);
6362f68f 94
6abb4bd5 95static void mutex_lock(pthread_mutex_t *mutex)
9f1621ca
MD
96{
97 int ret;
98
99#ifndef DISTRUST_SIGNALS_EXTREME
6abb4bd5 100 ret = pthread_mutex_lock(mutex);
4a6d7378
MD
101 if (ret)
102 urcu_die(ret);
9f1621ca 103#else /* #ifndef DISTRUST_SIGNALS_EXTREME */
6abb4bd5 104 while ((ret = pthread_mutex_trylock(mutex)) != 0) {
4a6d7378
MD
105 if (ret != EBUSY && ret != EINTR)
106 urcu_die(ret);
9f1621ca
MD
107 poll(NULL,0,10);
108 }
109#endif /* #else #ifndef DISTRUST_SIGNALS_EXTREME */
110}
111
6abb4bd5 112static void mutex_unlock(pthread_mutex_t *mutex)
9f1621ca
MD
113{
114 int ret;
115
6abb4bd5 116 ret = pthread_mutex_unlock(mutex);
4a6d7378
MD
117 if (ret)
118 urcu_die(ret);
9f1621ca
MD
119}
120
bc6c15bb
MD
121/*
122 * synchronize_rcu() waiting. Single thread.
123 */
4d703340 124static void wait_gp(void)
bc6c15bb 125{
4d703340 126 /* Read reader_gp before read futex */
5481ddb3 127 cmm_smp_rmb();
4477a870 128 if (uatomic_read(&urcu_qsbr_gp.futex) != -1)
b0a841b4 129 return;
4477a870 130 while (futex_noasync(&urcu_qsbr_gp.futex, FUTEX_WAIT, -1,
b0a841b4
MD
131 NULL, NULL, 0)) {
132 switch (errno) {
133 case EWOULDBLOCK:
134 /* Value already changed. */
135 return;
136 case EINTR:
137 /* Retry if interrupted by signal. */
138 break; /* Get out of switch. */
139 default:
140 /* Unexpected error. */
141 urcu_die(errno);
142 }
143 }
bc6c15bb
MD
144}
145
731ccb96
MD
146/*
147 * Always called with rcu_registry lock held. Releases this lock between
148 * iterations and grabs it again. Holds the lock when it returns.
149 */
708d89f0
MD
150static void wait_for_readers(struct cds_list_head *input_readers,
151 struct cds_list_head *cur_snap_readers,
152 struct cds_list_head *qsreaders)
9f1621ca 153{
9340c38d 154 unsigned int wait_loops = 0;
4477a870 155 struct urcu_qsbr_reader *index, *tmp;
9f1621ca 156
9f1621ca 157 /*
4477a870 158 * Wait for each thread URCU_TLS(urcu_qsbr_reader).ctr to either
f6b42f9c 159 * indicate quiescence (offline), or for them to observe the
4477a870 160 * current urcu_qsbr_gp.ctr value.
9f1621ca 161 */
4d703340 162 for (;;) {
5e81fed7
MD
163 if (wait_loops < RCU_QS_ACTIVE_ATTEMPTS)
164 wait_loops++;
83a2c421 165 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
4477a870 166 uatomic_set(&urcu_qsbr_gp.futex, -1);
83a2c421
PB
167 /*
168 * Write futex before write waiting (the other side
169 * reads them in the opposite order).
170 */
171 cmm_smp_wmb();
708d89f0 172 cds_list_for_each_entry(index, input_readers, node) {
83a2c421
PB
173 _CMM_STORE_SHARED(index->waiting, 1);
174 }
4d703340 175 /* Write futex before read reader_gp */
5481ddb3 176 cmm_smp_mb();
4d703340 177 }
708d89f0 178 cds_list_for_each_entry_safe(index, tmp, input_readers, node) {
4477a870
MD
179 switch (urcu_qsbr_reader_state(&index->ctr)) {
180 case URCU_READER_ACTIVE_CURRENT:
708d89f0
MD
181 if (cur_snap_readers) {
182 cds_list_move(&index->node,
183 cur_snap_readers);
184 break;
185 }
186 /* Fall-through */
4477a870 187 case URCU_READER_INACTIVE:
708d89f0
MD
188 cds_list_move(&index->node, qsreaders);
189 break;
4477a870 190 case URCU_READER_ACTIVE_OLD:
708d89f0
MD
191 /*
192 * Old snapshot. Leaving node in
193 * input_readers will make us busy-loop
194 * until the snapshot becomes current or
195 * the reader becomes inactive.
196 */
197 break;
198 }
4d703340 199 }
bc6c15bb 200
708d89f0 201 if (cds_list_empty(input_readers)) {
83a2c421 202 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
4d703340 203 /* Read reader_gp before write futex */
5481ddb3 204 cmm_smp_mb();
4477a870 205 uatomic_set(&urcu_qsbr_gp.futex, 0);
4d703340
MD
206 }
207 break;
208 } else {
731ccb96
MD
209 /* Temporarily unlock the registry lock. */
210 mutex_unlock(&rcu_registry_lock);
83a2c421 211 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
4d703340 212 wait_gp();
bc6c15bb 213 } else {
9f1621ca 214#ifndef HAS_INCOHERENT_CACHES
06f22bdb 215 caa_cpu_relax();
9f1621ca 216#else /* #ifndef HAS_INCOHERENT_CACHES */
5481ddb3 217 cmm_smp_mb();
9f1621ca 218#endif /* #else #ifndef HAS_INCOHERENT_CACHES */
bc6c15bb 219 }
731ccb96
MD
220 /* Re-lock the registry lock before the next loop. */
221 mutex_lock(&rcu_registry_lock);
bc6c15bb 222 }
9f1621ca
MD
223 }
224}
225
47d2f29e
MD
226/*
227 * Using a two-subphases algorithm for architectures with smaller than 64-bit
228 * long-size to ensure we do not encounter an overflow bug.
229 */
230
b39e1761 231#if (CAA_BITS_PER_LONG < 64)
4477a870 232void urcu_qsbr_synchronize_rcu(void)
47d2f29e 233{
708d89f0
MD
234 CDS_LIST_HEAD(cur_snap_readers);
235 CDS_LIST_HEAD(qsreaders);
bc49c323 236 unsigned long was_online;
bf6822a6
MD
237 DEFINE_URCU_WAIT_NODE(wait, URCU_WAIT_WAITING);
238 struct urcu_waiters waiters;
bc49c323 239
4477a870 240 was_online = urcu_qsbr_read_ongoing();
bc49c323 241
47d2f29e 242 /* All threads should read qparity before accessing data structure
27b940e7
PB
243 * where new ptr points to. In the "then" case, rcu_thread_offline
244 * includes a memory barrier.
245 *
bc49c323 246 * Mark the writer thread offline to make sure we don't wait for
5e77fc1f
PM
247 * our own quiescent state. This allows using synchronize_rcu()
248 * in threads registered as readers.
bc49c323 249 */
27b940e7 250 if (was_online)
4477a870 251 urcu_qsbr_thread_offline();
27b940e7
PB
252 else
253 cmm_smp_mb();
bc49c323 254
6362f68f 255 /*
bf6822a6 256 * Add ourself to gp_waiters queue of threads awaiting to wait
6362f68f 257 * for a grace period. Proceed to perform the grace period only
bf6822a6 258 * if we are the first thread added into the queue.
6362f68f 259 */
bf6822a6
MD
260 if (urcu_wait_add(&gp_waiters, &wait) != 0) {
261 /* Not first in queue: will be awakened by another thread. */
262 urcu_adaptative_busy_wait(&wait);
6362f68f
MD
263 goto gp_end;
264 }
bf6822a6
MD
265 /* We won't need to wake ourself up */
266 urcu_wait_set_state(&wait, URCU_WAIT_RUNNING);
6362f68f 267
6abb4bd5 268 mutex_lock(&rcu_gp_lock);
47d2f29e 269
6362f68f 270 /*
bf6822a6 271 * Move all waiters into our local queue.
6362f68f 272 */
bf6822a6 273 urcu_move_waiters(&waiters, &gp_waiters);
6362f68f 274
731ccb96
MD
275 mutex_lock(&rcu_registry_lock);
276
16aa9ee8 277 if (cds_list_empty(&registry))
2dfb8b5e 278 goto out;
47d2f29e
MD
279
280 /*
f6b42f9c 281 * Wait for readers to observe original parity or be quiescent.
731ccb96
MD
282 * wait_for_readers() can release and grab again rcu_registry_lock
283 * interally.
47d2f29e 284 */
708d89f0 285 wait_for_readers(&registry, &cur_snap_readers, &qsreaders);
47d2f29e
MD
286
287 /*
f6b42f9c 288 * Must finish waiting for quiescent state for original parity
4477a870 289 * before committing next urcu_qsbr_gp.ctr update to memory. Failure
f6b42f9c 290 * to do so could result in the writer waiting forever while new
5e77fc1f 291 * readers are always accessing data (no progress). Enforce
4477a870
MD
292 * compiler-order of load URCU_TLS(urcu_qsbr_reader).ctr before store
293 * to urcu_qsbr_gp.ctr.
47d2f29e 294 */
5481ddb3 295 cmm_barrier();
47d2f29e 296
47d2f29e 297 /*
5481ddb3 298 * Adding a cmm_smp_mb() which is _not_ formally required, but makes the
2dfb8b5e
MD
299 * model easier to understand. It does not have a big performance impact
300 * anyway, given this is the write-side.
47d2f29e 301 */
5481ddb3 302 cmm_smp_mb();
47d2f29e 303
f6b42f9c 304 /* Switch parity: 0 -> 1, 1 -> 0 */
4477a870 305 CMM_STORE_SHARED(urcu_qsbr_gp.ctr, urcu_qsbr_gp.ctr ^ URCU_QSBR_GP_CTR);
f6b42f9c 306
47d2f29e 307 /*
4477a870 308 * Must commit urcu_qsbr_gp.ctr update to memory before waiting for
f6b42f9c
MD
309 * quiescent state. Failure to do so could result in the writer
310 * waiting forever while new readers are always accessing data
4477a870
MD
311 * (no progress). Enforce compiler-order of store to urcu_qsbr_gp.ctr
312 * before load URCU_TLS(urcu_qsbr_reader).ctr.
47d2f29e 313 */
f6b42f9c
MD
314 cmm_barrier();
315
316 /*
317 * Adding a cmm_smp_mb() which is _not_ formally required, but makes the
318 * model easier to understand. It does not have a big performance impact
319 * anyway, given this is the write-side.
320 */
321 cmm_smp_mb();
322
323 /*
324 * Wait for readers to observe new parity or be quiescent.
731ccb96
MD
325 * wait_for_readers() can release and grab again rcu_registry_lock
326 * interally.
f6b42f9c 327 */
708d89f0
MD
328 wait_for_readers(&cur_snap_readers, NULL, &qsreaders);
329
330 /*
331 * Put quiescent reader list back into registry.
332 */
333 cds_list_splice(&qsreaders, &registry);
2dfb8b5e 334out:
731ccb96 335 mutex_unlock(&rcu_registry_lock);
6abb4bd5 336 mutex_unlock(&rcu_gp_lock);
bf6822a6 337 urcu_wake_all_waiters(&waiters);
6362f68f 338gp_end:
bc49c323
MD
339 /*
340 * Finish waiting for reader threads before letting the old ptr being
47d2f29e
MD
341 * freed.
342 */
bc49c323 343 if (was_online)
4477a870 344 urcu_qsbr_thread_online();
27b940e7
PB
345 else
346 cmm_smp_mb();
47d2f29e 347}
b39e1761 348#else /* !(CAA_BITS_PER_LONG < 64) */
4477a870 349void urcu_qsbr_synchronize_rcu(void)
9f1621ca 350{
708d89f0 351 CDS_LIST_HEAD(qsreaders);
f0f7dbdd 352 unsigned long was_online;
bf6822a6
MD
353 DEFINE_URCU_WAIT_NODE(wait, URCU_WAIT_WAITING);
354 struct urcu_waiters waiters;
ff2f67a0 355
4477a870 356 was_online = urcu_qsbr_read_ongoing();
ff2f67a0
MD
357
358 /*
359 * Mark the writer thread offline to make sure we don't wait for
5e77fc1f
PM
360 * our own quiescent state. This allows using synchronize_rcu()
361 * in threads registered as readers.
ff2f67a0 362 */
27b940e7 363 if (was_online)
4477a870 364 urcu_qsbr_thread_offline();
27b940e7
PB
365 else
366 cmm_smp_mb();
ff2f67a0 367
6362f68f 368 /*
bf6822a6 369 * Add ourself to gp_waiters queue of threads awaiting to wait
6362f68f 370 * for a grace period. Proceed to perform the grace period only
bf6822a6 371 * if we are the first thread added into the queue.
6362f68f 372 */
bf6822a6
MD
373 if (urcu_wait_add(&gp_waiters, &wait) != 0) {
374 /* Not first in queue: will be awakened by another thread. */
375 urcu_adaptative_busy_wait(&wait);
6362f68f
MD
376 goto gp_end;
377 }
bf6822a6
MD
378 /* We won't need to wake ourself up */
379 urcu_wait_set_state(&wait, URCU_WAIT_RUNNING);
6362f68f 380
6abb4bd5 381 mutex_lock(&rcu_gp_lock);
6362f68f
MD
382
383 /*
bf6822a6 384 * Move all waiters into our local queue.
6362f68f 385 */
bf6822a6 386 urcu_move_waiters(&waiters, &gp_waiters);
6362f68f 387
731ccb96
MD
388 mutex_lock(&rcu_registry_lock);
389
16aa9ee8 390 if (cds_list_empty(&registry))
2dfb8b5e 391 goto out;
f6b42f9c
MD
392
393 /* Increment current G.P. */
4477a870 394 CMM_STORE_SHARED(urcu_qsbr_gp.ctr, urcu_qsbr_gp.ctr + URCU_QSBR_GP_CTR);
f6b42f9c
MD
395
396 /*
4477a870 397 * Must commit urcu_qsbr_gp.ctr update to memory before waiting for
f6b42f9c
MD
398 * quiescent state. Failure to do so could result in the writer
399 * waiting forever while new readers are always accessing data
4477a870
MD
400 * (no progress). Enforce compiler-order of store to urcu_qsbr_gp.ctr
401 * before load URCU_TLS(urcu_qsbr_reader).ctr.
f6b42f9c
MD
402 */
403 cmm_barrier();
404
405 /*
406 * Adding a cmm_smp_mb() which is _not_ formally required, but makes the
407 * model easier to understand. It does not have a big performance impact
408 * anyway, given this is the write-side.
409 */
410 cmm_smp_mb();
411
412 /*
413 * Wait for readers to observe new count of be quiescent.
731ccb96
MD
414 * wait_for_readers() can release and grab again rcu_registry_lock
415 * interally.
f6b42f9c 416 */
708d89f0
MD
417 wait_for_readers(&registry, NULL, &qsreaders);
418
419 /*
420 * Put quiescent reader list back into registry.
421 */
422 cds_list_splice(&qsreaders, &registry);
2dfb8b5e 423out:
731ccb96 424 mutex_unlock(&rcu_registry_lock);
6abb4bd5 425 mutex_unlock(&rcu_gp_lock);
bf6822a6 426 urcu_wake_all_waiters(&waiters);
6362f68f 427gp_end:
ff2f67a0 428 if (was_online)
4477a870 429 urcu_qsbr_thread_online();
27b940e7
PB
430 else
431 cmm_smp_mb();
9f1621ca 432}
b39e1761 433#endif /* !(CAA_BITS_PER_LONG < 64) */
ce28e67a 434URCU_ATTR_ALIAS("urcu_qsbr_synchronize_rcu")
4477a870 435void synchronize_rcu_qsbr();
9f1621ca
MD
436
437/*
438 * library wrappers to be used by non-LGPL compatible source code.
439 */
440
4477a870 441void urcu_qsbr_read_lock(void)
9f1621ca 442{
4477a870 443 _urcu_qsbr_read_lock();
9f1621ca 444}
ce28e67a 445URCU_ATTR_ALIAS("urcu_qsbr_read_lock") void rcu_read_lock_qsbr();
9f1621ca 446
4477a870 447void urcu_qsbr_read_unlock(void)
9f1621ca 448{
4477a870 449 _urcu_qsbr_read_unlock();
9f1621ca 450}
ce28e67a 451URCU_ATTR_ALIAS("urcu_qsbr_read_unlock") void rcu_read_unlock_qsbr();
9f1621ca 452
4477a870 453int urcu_qsbr_read_ongoing(void)
882f3357 454{
4477a870 455 return _urcu_qsbr_read_ongoing();
882f3357 456}
ce28e67a 457URCU_ATTR_ALIAS("urcu_qsbr_read_ongoing")
4477a870 458void rcu_read_ongoing_qsbr();
882f3357 459
4477a870 460void urcu_qsbr_quiescent_state(void)
7ac06cef 461{
4477a870 462 _urcu_qsbr_quiescent_state();
7ac06cef 463}
ce28e67a 464URCU_ATTR_ALIAS("urcu_qsbr_quiescent_state")
4477a870 465void rcu_quiescent_state_qsbr();
7ac06cef 466
4477a870 467void urcu_qsbr_thread_offline(void)
7ac06cef 468{
4477a870 469 _urcu_qsbr_thread_offline();
7ac06cef 470}
ce28e67a 471URCU_ATTR_ALIAS("urcu_qsbr_thread_offline")
4477a870 472void rcu_thread_offline_qsbr();
7ac06cef 473
4477a870 474void urcu_qsbr_thread_online(void)
7ac06cef 475{
4477a870 476 _urcu_qsbr_thread_online();
7ac06cef 477}
ce28e67a 478URCU_ATTR_ALIAS("urcu_qsbr_thread_online")
4477a870 479void rcu_thread_online_qsbr();
7ac06cef 480
4477a870 481void urcu_qsbr_register_thread(void)
9f1621ca 482{
4477a870
MD
483 URCU_TLS(urcu_qsbr_reader).tid = pthread_self();
484 assert(URCU_TLS(urcu_qsbr_reader).ctr == 0);
4f8e3380 485
731ccb96 486 mutex_lock(&rcu_registry_lock);
4477a870
MD
487 assert(!URCU_TLS(urcu_qsbr_reader).registered);
488 URCU_TLS(urcu_qsbr_reader).registered = 1;
489 cds_list_add(&URCU_TLS(urcu_qsbr_reader).node, &registry);
731ccb96 490 mutex_unlock(&rcu_registry_lock);
4477a870 491 _urcu_qsbr_thread_online();
9f1621ca 492}
ce28e67a 493URCU_ATTR_ALIAS("urcu_qsbr_register_thread")
4477a870 494void rcu_register_thread_qsbr();
9f1621ca 495
4477a870 496void urcu_qsbr_unregister_thread(void)
9f1621ca 497{
76f3022f
MD
498 /*
499 * We have to make the thread offline otherwise we end up dealocking
500 * with a waiting writer.
501 */
4477a870
MD
502 _urcu_qsbr_thread_offline();
503 assert(URCU_TLS(urcu_qsbr_reader).registered);
504 URCU_TLS(urcu_qsbr_reader).registered = 0;
731ccb96 505 mutex_lock(&rcu_registry_lock);
4477a870 506 cds_list_del(&URCU_TLS(urcu_qsbr_reader).node);
731ccb96 507 mutex_unlock(&rcu_registry_lock);
9f1621ca 508}
ce28e67a 509URCU_ATTR_ALIAS("urcu_qsbr_unregister_thread")
4477a870 510void rcu_unregister_thread_qsbr();
f6d18c64 511
4477a870 512void urcu_qsbr_exit(void)
f6d18c64 513{
01cadde4
MD
514 /*
515 * Assertion disabled because call_rcu threads are now rcu
516 * readers, and left running at exit.
517 * assert(cds_list_empty(&registry));
518 */
f6d18c64 519}
ce28e67a 520URCU_ATTR_ALIAS("urcu_qsbr_exit") void rcu_exit_qsbr();
5e77fc1f 521
5e6b23a6 522DEFINE_RCU_FLAVOR(rcu_flavor);
4477a870 523DEFINE_RCU_FLAVOR_ALIAS(rcu_flavor, alias_rcu_flavor);
541d828d 524
5e77fc1f 525#include "urcu-call-rcu-impl.h"
0376e7b2 526#include "urcu-defer-impl.h"
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