Commit | Line | Data |
---|---|---|
b257a10b MD |
1 | /* |
2 | * urcu.c | |
3 | * | |
4 | * Userspace RCU library | |
5 | * | |
6982d6d7 | 6 | * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
af02d47e | 7 | * Copyright (c) 2009 Paul E. McKenney, IBM Corporation. |
b257a10b | 8 | * |
af02d47e MD |
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 | |
54843abc PM |
22 | * |
23 | * IBM's contributions to this file may be relicensed under LGPLv2 or later. | |
b257a10b MD |
24 | */ |
25 | ||
fdf01eed | 26 | #define _BSD_SOURCE |
c1d2c60b | 27 | #define _GNU_SOURCE |
71c811bf | 28 | #define _LGPL_SOURCE |
27b012e2 MD |
29 | #include <stdio.h> |
30 | #include <pthread.h> | |
31 | #include <signal.h> | |
32 | #include <assert.h> | |
f69f195a | 33 | #include <stdlib.h> |
6d841bc2 | 34 | #include <stdint.h> |
f69f195a | 35 | #include <string.h> |
09a9f986 | 36 | #include <errno.h> |
e8043c1b | 37 | #include <poll.h> |
27b012e2 | 38 | |
d73fb81f | 39 | #include "urcu/wfcqueue.h" |
57760d44 | 40 | #include "urcu/map/urcu.h" |
af7c2dbe | 41 | #include "urcu/static/urcu.h" |
618b2595 | 42 | #include "urcu-pointer.h" |
bd252a04 | 43 | #include "urcu/tls-compat.h" |
71c811bf | 44 | |
4a6d7378 MD |
45 | #include "urcu-die.h" |
46 | ||
121a5d44 | 47 | /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */ |
71c811bf | 48 | #undef _LGPL_SOURCE |
27b012e2 | 49 | #include "urcu.h" |
71c811bf | 50 | #define _LGPL_SOURCE |
27b012e2 | 51 | |
3a71751e PB |
52 | /* |
53 | * If a reader is really non-cooperative and refuses to commit its | |
54 | * rcu_active_readers count to memory (there is no barrier in the reader | |
55 | * per-se), kick it after a few loops waiting for it. | |
56 | */ | |
57 | #define KICK_READER_LOOPS 10000 | |
58 | ||
59 | /* | |
60 | * Active attempts to check for reader Q.S. before calling futex(). | |
61 | */ | |
62 | #define RCU_QS_ACTIVE_ATTEMPTS 100 | |
63 | ||
fdf01eed | 64 | #ifdef RCU_MEMBARRIER |
834a45ba | 65 | static int init_done; |
1de4df4b | 66 | int rcu_has_sys_membarrier; |
834a45ba | 67 | |
02be5561 | 68 | void __attribute__((constructor)) rcu_init(void); |
fdf01eed MD |
69 | #endif |
70 | ||
71 | #ifdef RCU_MB | |
02be5561 | 72 | void rcu_init(void) |
e90a6e9c MD |
73 | { |
74 | } | |
75 | #endif | |
8a5fb4c9 | 76 | |
fdf01eed MD |
77 | #ifdef RCU_SIGNAL |
78 | static int init_done; | |
79 | ||
80 | void __attribute__((constructor)) rcu_init(void); | |
81 | void __attribute__((destructor)) rcu_exit(void); | |
82 | #endif | |
83 | ||
6abb4bd5 | 84 | static pthread_mutex_t rcu_gp_lock = PTHREAD_MUTEX_INITIALIZER; |
27b012e2 | 85 | |
1de4df4b | 86 | int32_t rcu_gp_futex; |
bc6c15bb | 87 | |
128166c9 MD |
88 | /* |
89 | * Global grace period counter. | |
02be5561 | 90 | * Contains the current RCU_GP_CTR_PHASE. |
afb8f2c9 | 91 | * Also has a RCU_GP_COUNT of 1, to accelerate the reader fast path. |
b0d5e790 | 92 | * Written to only by writer with mutex taken. Read by both writer and readers. |
128166c9 | 93 | */ |
27d65bc5 | 94 | unsigned long rcu_gp_ctr = RCU_GP_COUNT; |
27b012e2 | 95 | |
b0d5e790 MD |
96 | /* |
97 | * Written to only by each individual reader. Read by both the reader and the | |
98 | * writers. | |
99 | */ | |
bd252a04 | 100 | DEFINE_URCU_TLS(struct rcu_reader, rcu_reader); |
27b012e2 | 101 | |
cf380c2f | 102 | #ifdef DEBUG_YIELD |
1de4df4b MD |
103 | unsigned int rcu_yield_active; |
104 | DEFINE_URCU_TLS(unsigned int, rcu_rand_yield); | |
cf380c2f MD |
105 | #endif |
106 | ||
16aa9ee8 | 107 | static CDS_LIST_HEAD(registry); |
27b012e2 | 108 | |
6abb4bd5 | 109 | static void mutex_lock(pthread_mutex_t *mutex) |
41718ff9 MD |
110 | { |
111 | int ret; | |
09a9f986 PM |
112 | |
113 | #ifndef DISTRUST_SIGNALS_EXTREME | |
6abb4bd5 | 114 | ret = pthread_mutex_lock(mutex); |
4a6d7378 MD |
115 | if (ret) |
116 | urcu_die(ret); | |
09a9f986 | 117 | #else /* #ifndef DISTRUST_SIGNALS_EXTREME */ |
6abb4bd5 | 118 | while ((ret = pthread_mutex_trylock(mutex)) != 0) { |
4a6d7378 MD |
119 | if (ret != EBUSY && ret != EINTR) |
120 | urcu_die(ret); | |
bd252a04 | 121 | if (CMM_LOAD_SHARED(URCU_TLS(rcu_reader).need_mb)) { |
5481ddb3 | 122 | cmm_smp_mb(); |
bd252a04 | 123 | _CMM_STORE_SHARED(URCU_TLS(rcu_reader).need_mb, 0); |
5481ddb3 | 124 | cmm_smp_mb(); |
09a9f986 PM |
125 | } |
126 | poll(NULL,0,10); | |
127 | } | |
128 | #endif /* #else #ifndef DISTRUST_SIGNALS_EXTREME */ | |
41718ff9 MD |
129 | } |
130 | ||
6abb4bd5 | 131 | static void mutex_unlock(pthread_mutex_t *mutex) |
41718ff9 MD |
132 | { |
133 | int ret; | |
134 | ||
6abb4bd5 | 135 | ret = pthread_mutex_unlock(mutex); |
4a6d7378 MD |
136 | if (ret) |
137 | urcu_die(ret); | |
41718ff9 MD |
138 | } |
139 | ||
fdf01eed | 140 | #ifdef RCU_MEMBARRIER |
25cc6d18 | 141 | static void smp_mb_master(int group) |
fdf01eed | 142 | { |
1de4df4b | 143 | if (caa_likely(rcu_has_sys_membarrier)) |
f0708810 | 144 | membarrier(MEMBARRIER_EXPEDITED); |
fdf01eed | 145 | else |
5481ddb3 | 146 | cmm_smp_mb(); |
fdf01eed MD |
147 | } |
148 | #endif | |
149 | ||
02be5561 | 150 | #ifdef RCU_MB |
25cc6d18 | 151 | static void smp_mb_master(int group) |
40e140c9 | 152 | { |
5481ddb3 | 153 | cmm_smp_mb(); |
40e140c9 | 154 | } |
fdf01eed MD |
155 | #endif |
156 | ||
157 | #ifdef RCU_SIGNAL | |
78ff9419 | 158 | static void force_mb_all_readers(void) |
27b012e2 | 159 | { |
02be5561 | 160 | struct rcu_reader *index; |
e3b0cef0 | 161 | |
27b012e2 | 162 | /* |
5481ddb3 | 163 | * Ask for each threads to execute a cmm_smp_mb() so we can consider the |
27b012e2 MD |
164 | * compiler barriers around rcu read lock as real memory barriers. |
165 | */ | |
16aa9ee8 | 166 | if (cds_list_empty(®istry)) |
27b012e2 | 167 | return; |
3a86deba | 168 | /* |
5481ddb3 | 169 | * pthread_kill has a cmm_smp_mb(). But beware, we assume it performs |
157dca95 | 170 | * a cache flush on architectures with non-coherent cache. Let's play |
5481ddb3 | 171 | * safe and don't assume anything : we use cmm_smp_mc() to make sure the |
157dca95 | 172 | * cache flush is enforced. |
3a86deba | 173 | */ |
16aa9ee8 | 174 | cds_list_for_each_entry(index, ®istry, node) { |
6cf3827c | 175 | CMM_STORE_SHARED(index->need_mb, 1); |
02be5561 | 176 | pthread_kill(index->tid, SIGRCU); |
09a9f986 | 177 | } |
27b012e2 MD |
178 | /* |
179 | * Wait for sighandler (and thus mb()) to execute on every thread. | |
09a9f986 PM |
180 | * |
181 | * Note that the pthread_kill() will never be executed on systems | |
182 | * that correctly deliver signals in a timely manner. However, it | |
183 | * is not uncommon for kernels to have bugs that can result in | |
184 | * lost or unduly delayed signals. | |
185 | * | |
186 | * If you are seeing the below pthread_kill() executing much at | |
187 | * all, we suggest testing the underlying kernel and filing the | |
188 | * relevant bug report. For Linux kernels, we recommend getting | |
189 | * the Linux Test Project (LTP). | |
27b012e2 | 190 | */ |
16aa9ee8 | 191 | cds_list_for_each_entry(index, ®istry, node) { |
6cf3827c | 192 | while (CMM_LOAD_SHARED(index->need_mb)) { |
02be5561 | 193 | pthread_kill(index->tid, SIGRCU); |
09a9f986 PM |
194 | poll(NULL, 0, 1); |
195 | } | |
196 | } | |
5481ddb3 | 197 | cmm_smp_mb(); /* read ->need_mb before ending the barrier */ |
27b012e2 | 198 | } |
9d7e3f89 | 199 | |
25cc6d18 | 200 | static void smp_mb_master(int group) |
9d7e3f89 MD |
201 | { |
202 | force_mb_all_readers(); | |
203 | } | |
fdf01eed | 204 | #endif /* #ifdef RCU_SIGNAL */ |
27b012e2 | 205 | |
bc6c15bb MD |
206 | /* |
207 | * synchronize_rcu() waiting. Single thread. | |
208 | */ | |
cfe78e25 | 209 | static void wait_gp(void) |
bc6c15bb | 210 | { |
cfe78e25 | 211 | /* Read reader_gp before read futex */ |
25cc6d18 | 212 | smp_mb_master(RCU_MB_GROUP); |
1de4df4b MD |
213 | if (uatomic_read(&rcu_gp_futex) == -1) |
214 | futex_async(&rcu_gp_futex, FUTEX_WAIT, -1, | |
cfe78e25 | 215 | NULL, NULL, 0); |
bc6c15bb MD |
216 | } |
217 | ||
fd189fa5 MD |
218 | static void wait_for_readers(struct cds_list_head *input_readers, |
219 | struct cds_list_head *cur_snap_readers, | |
220 | struct cds_list_head *qsreaders) | |
27b012e2 | 221 | { |
cfe78e25 | 222 | int wait_loops = 0; |
02be5561 | 223 | struct rcu_reader *index, *tmp; |
27b012e2 | 224 | |
40e140c9 | 225 | /* |
c9488684 MD |
226 | * Wait for each thread URCU_TLS(rcu_reader).ctr to either |
227 | * indicate quiescence (not nested), or observe the current | |
228 | * rcu_gp_ctr value. | |
27b012e2 | 229 | */ |
cfe78e25 MD |
230 | for (;;) { |
231 | wait_loops++; | |
232 | if (wait_loops == RCU_QS_ACTIVE_ATTEMPTS) { | |
1de4df4b | 233 | uatomic_dec(&rcu_gp_futex); |
cfe78e25 | 234 | /* Write futex before read reader_gp */ |
25cc6d18 | 235 | smp_mb_master(RCU_MB_GROUP); |
cfe78e25 MD |
236 | } |
237 | ||
fd189fa5 MD |
238 | cds_list_for_each_entry_safe(index, tmp, input_readers, node) { |
239 | switch (rcu_reader_state(&index->ctr)) { | |
240 | case RCU_READER_ACTIVE_CURRENT: | |
241 | if (cur_snap_readers) { | |
242 | cds_list_move(&index->node, | |
243 | cur_snap_readers); | |
244 | break; | |
245 | } | |
246 | /* Fall-through */ | |
247 | case RCU_READER_INACTIVE: | |
248 | cds_list_move(&index->node, qsreaders); | |
249 | break; | |
250 | case RCU_READER_ACTIVE_OLD: | |
251 | /* | |
252 | * Old snapshot. Leaving node in | |
253 | * input_readers will make us busy-loop | |
254 | * until the snapshot becomes current or | |
255 | * the reader becomes inactive. | |
256 | */ | |
257 | break; | |
258 | } | |
cfe78e25 MD |
259 | } |
260 | ||
e8043c1b | 261 | #ifndef HAS_INCOHERENT_CACHES |
fd189fa5 | 262 | if (cds_list_empty(input_readers)) { |
cfe78e25 MD |
263 | if (wait_loops == RCU_QS_ACTIVE_ATTEMPTS) { |
264 | /* Read reader_gp before write futex */ | |
25cc6d18 | 265 | smp_mb_master(RCU_MB_GROUP); |
1de4df4b | 266 | uatomic_set(&rcu_gp_futex, 0); |
bc6c15bb | 267 | } |
cfe78e25 MD |
268 | break; |
269 | } else { | |
270 | if (wait_loops == RCU_QS_ACTIVE_ATTEMPTS) | |
271 | wait_gp(); | |
272 | else | |
06f22bdb | 273 | caa_cpu_relax(); |
bc6c15bb | 274 | } |
e8043c1b | 275 | #else /* #ifndef HAS_INCOHERENT_CACHES */ |
27b012e2 | 276 | /* |
40e140c9 | 277 | * BUSY-LOOP. Force the reader thread to commit its |
bd252a04 MD |
278 | * URCU_TLS(rcu_reader).ctr update to memory if we wait |
279 | * for too long. | |
27b012e2 | 280 | */ |
fd189fa5 | 281 | if (cds_list_empty(input_readers)) { |
cfe78e25 MD |
282 | if (wait_loops == RCU_QS_ACTIVE_ATTEMPTS) { |
283 | /* Read reader_gp before write futex */ | |
25cc6d18 | 284 | smp_mb_master(RCU_MB_GROUP); |
1de4df4b | 285 | uatomic_set(&rcu_gp_futex, 0); |
cfe78e25 MD |
286 | } |
287 | break; | |
288 | } else { | |
289 | switch (wait_loops) { | |
bc6c15bb | 290 | case RCU_QS_ACTIVE_ATTEMPTS: |
cfe78e25 MD |
291 | wait_gp(); |
292 | break; /* only escape switch */ | |
bc6c15bb | 293 | case KICK_READER_LOOPS: |
25cc6d18 | 294 | smp_mb_master(RCU_MB_GROUP); |
40e140c9 | 295 | wait_loops = 0; |
cfe78e25 | 296 | break; /* only escape switch */ |
bc6c15bb | 297 | default: |
06f22bdb | 298 | caa_cpu_relax(); |
40e140c9 MD |
299 | } |
300 | } | |
e8043c1b | 301 | #endif /* #else #ifndef HAS_INCOHERENT_CACHES */ |
27b012e2 | 302 | } |
27b012e2 MD |
303 | } |
304 | ||
9598a481 | 305 | void synchronize_rcu(void) |
2bc59bd7 | 306 | { |
fd189fa5 MD |
307 | CDS_LIST_HEAD(cur_snap_readers); |
308 | CDS_LIST_HEAD(qsreaders); | |
309 | ||
6abb4bd5 | 310 | mutex_lock(&rcu_gp_lock); |
135530fd | 311 | |
16aa9ee8 | 312 | if (cds_list_empty(®istry)) |
2dfb8b5e MD |
313 | goto out; |
314 | ||
9598a481 | 315 | /* All threads should read qparity before accessing data structure |
6abb4bd5 MD |
316 | * where new ptr points to. Must be done within rcu_gp_lock because it |
317 | * iterates on reader threads.*/ | |
9598a481 | 318 | /* Write new ptr before changing the qparity */ |
25cc6d18 | 319 | smp_mb_master(RCU_MB_GROUP); |
9598a481 | 320 | |
9598a481 | 321 | /* |
c9488684 | 322 | * Wait for readers to observe original parity or be quiescent. |
9598a481 | 323 | */ |
fd189fa5 | 324 | wait_for_readers(®istry, &cur_snap_readers, &qsreaders); |
9598a481 MD |
325 | |
326 | /* | |
c9488684 | 327 | * Must finish waiting for quiescent state for original parity before |
d40fde2c MD |
328 | * committing next rcu_gp_ctr update to memory. Failure to do so could |
329 | * result in the writer waiting forever while new readers are always | |
330 | * accessing data (no progress). Enforce compiler-order of load | |
bd252a04 | 331 | * URCU_TLS(rcu_reader).ctr before store to rcu_gp_ctr. |
9598a481 | 332 | */ |
5481ddb3 | 333 | cmm_barrier(); |
9598a481 | 334 | |
5dba80f9 | 335 | /* |
5481ddb3 | 336 | * Adding a cmm_smp_mb() which is _not_ formally required, but makes the |
5dba80f9 MD |
337 | * model easier to understand. It does not have a big performance impact |
338 | * anyway, given this is the write-side. | |
339 | */ | |
5481ddb3 | 340 | cmm_smp_mb(); |
67c2d80b | 341 | |
c9488684 MD |
342 | /* Switch parity: 0 -> 1, 1 -> 0 */ |
343 | CMM_STORE_SHARED(rcu_gp_ctr, rcu_gp_ctr ^ RCU_GP_CTR_PHASE); | |
344 | ||
345 | /* | |
346 | * Must commit rcu_gp_ctr update to memory before waiting for quiescent | |
347 | * state. Failure to do so could result in the writer waiting forever | |
348 | * while new readers are always accessing data (no progress). Enforce | |
349 | * compiler-order of store to rcu_gp_ctr before load rcu_reader ctr. | |
350 | */ | |
351 | cmm_barrier(); | |
352 | ||
353 | /* | |
354 | * | |
355 | * Adding a cmm_smp_mb() which is _not_ formally required, but makes the | |
356 | * model easier to understand. It does not have a big performance impact | |
357 | * anyway, given this is the write-side. | |
358 | */ | |
359 | cmm_smp_mb(); | |
360 | ||
9598a481 | 361 | /* |
c9488684 | 362 | * Wait for readers to observe new parity or be quiescent. |
9598a481 | 363 | */ |
fd189fa5 MD |
364 | wait_for_readers(&cur_snap_readers, NULL, &qsreaders); |
365 | ||
366 | /* | |
367 | * Put quiescent reader list back into registry. | |
368 | */ | |
369 | cds_list_splice(&qsreaders, ®istry); | |
9598a481 | 370 | |
9598a481 | 371 | /* Finish waiting for reader threads before letting the old ptr being |
6abb4bd5 MD |
372 | * freed. Must be done within rcu_gp_lock because it iterates on reader |
373 | * threads. */ | |
25cc6d18 | 374 | smp_mb_master(RCU_MB_GROUP); |
2dfb8b5e | 375 | out: |
6abb4bd5 | 376 | mutex_unlock(&rcu_gp_lock); |
2bc59bd7 PM |
377 | } |
378 | ||
121a5d44 MD |
379 | /* |
380 | * library wrappers to be used by non-LGPL compatible source code. | |
381 | */ | |
382 | ||
383 | void rcu_read_lock(void) | |
384 | { | |
385 | _rcu_read_lock(); | |
386 | } | |
387 | ||
388 | void rcu_read_unlock(void) | |
389 | { | |
390 | _rcu_read_unlock(); | |
391 | } | |
392 | ||
121a5d44 | 393 | void rcu_register_thread(void) |
27b012e2 | 394 | { |
bd252a04 MD |
395 | URCU_TLS(rcu_reader).tid = pthread_self(); |
396 | assert(URCU_TLS(rcu_reader).need_mb == 0); | |
397 | assert(!(URCU_TLS(rcu_reader).ctr & RCU_GP_CTR_NEST_MASK)); | |
02be5561 | 398 | |
6abb4bd5 | 399 | mutex_lock(&rcu_gp_lock); |
02be5561 | 400 | rcu_init(); /* In case gcc does not support constructor attribute */ |
bd252a04 | 401 | cds_list_add(&URCU_TLS(rcu_reader).node, ®istry); |
6abb4bd5 | 402 | mutex_unlock(&rcu_gp_lock); |
27b012e2 MD |
403 | } |
404 | ||
121a5d44 | 405 | void rcu_unregister_thread(void) |
27b012e2 | 406 | { |
6abb4bd5 | 407 | mutex_lock(&rcu_gp_lock); |
bd252a04 | 408 | cds_list_del(&URCU_TLS(rcu_reader).node); |
6abb4bd5 | 409 | mutex_unlock(&rcu_gp_lock); |
27b012e2 MD |
410 | } |
411 | ||
fdf01eed MD |
412 | #ifdef RCU_MEMBARRIER |
413 | void rcu_init(void) | |
414 | { | |
415 | if (init_done) | |
416 | return; | |
417 | init_done = 1; | |
cf5271ee | 418 | if (!membarrier(MEMBARRIER_EXPEDITED | MEMBARRIER_QUERY)) |
1de4df4b | 419 | rcu_has_sys_membarrier = 1; |
fdf01eed MD |
420 | } |
421 | #endif | |
422 | ||
423 | #ifdef RCU_SIGNAL | |
02be5561 | 424 | static void sigrcu_handler(int signo, siginfo_t *siginfo, void *context) |
27b012e2 | 425 | { |
40e140c9 | 426 | /* |
5481ddb3 DG |
427 | * Executing this cmm_smp_mb() is the only purpose of this signal handler. |
428 | * It punctually promotes cmm_barrier() into cmm_smp_mb() on every thread it is | |
40e140c9 MD |
429 | * executed on. |
430 | */ | |
5481ddb3 | 431 | cmm_smp_mb(); |
bd252a04 | 432 | _CMM_STORE_SHARED(URCU_TLS(rcu_reader).need_mb, 0); |
5481ddb3 | 433 | cmm_smp_mb(); |
27b012e2 MD |
434 | } |
435 | ||
8a5fb4c9 | 436 | /* |
02be5561 | 437 | * rcu_init constructor. Called when the library is linked, but also when |
8a5fb4c9 MD |
438 | * reader threads are calling rcu_register_thread(). |
439 | * Should only be called by a single thread at a given time. This is ensured by | |
6abb4bd5 MD |
440 | * holing the rcu_gp_lock from rcu_register_thread() or by running at library |
441 | * load time, which should not be executed by multiple threads nor concurrently | |
442 | * with rcu_register_thread() anyway. | |
8a5fb4c9 | 443 | */ |
02be5561 | 444 | void rcu_init(void) |
27b012e2 MD |
445 | { |
446 | struct sigaction act; | |
447 | int ret; | |
448 | ||
8a5fb4c9 MD |
449 | if (init_done) |
450 | return; | |
451 | init_done = 1; | |
452 | ||
02be5561 | 453 | act.sa_sigaction = sigrcu_handler; |
dd052bd3 | 454 | act.sa_flags = SA_SIGINFO | SA_RESTART; |
c297c21c | 455 | sigemptyset(&act.sa_mask); |
02be5561 | 456 | ret = sigaction(SIGRCU, &act, NULL); |
4a6d7378 MD |
457 | if (ret) |
458 | urcu_die(errno); | |
27b012e2 MD |
459 | } |
460 | ||
02be5561 | 461 | void rcu_exit(void) |
27b012e2 MD |
462 | { |
463 | struct sigaction act; | |
464 | int ret; | |
465 | ||
02be5561 | 466 | ret = sigaction(SIGRCU, NULL, &act); |
4a6d7378 MD |
467 | if (ret) |
468 | urcu_die(errno); | |
02be5561 | 469 | assert(act.sa_sigaction == sigrcu_handler); |
16aa9ee8 | 470 | assert(cds_list_empty(®istry)); |
27b012e2 | 471 | } |
5e77fc1f | 472 | |
fdf01eed | 473 | #endif /* #ifdef RCU_SIGNAL */ |
5e77fc1f | 474 | |
5e6b23a6 | 475 | DEFINE_RCU_FLAVOR(rcu_flavor); |
541d828d | 476 | |
5e77fc1f | 477 | #include "urcu-call-rcu-impl.h" |
0376e7b2 | 478 | #include "urcu-defer-impl.h" |