Fix: rculfhash only needs to include urcu-pointers.h
[urcu.git] / urcu.c
CommitLineData
b257a10b
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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 *
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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
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22 *
23 * IBM's contributions to this file may be relicensed under LGPLv2 or later.
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24 */
25
fdf01eed 26#define _BSD_SOURCE
c1d2c60b 27#define _GNU_SOURCE
71c811bf 28#define _LGPL_SOURCE
82d50e1a 29#define _DEFAULT_SOURCE
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30#include <stdio.h>
31#include <pthread.h>
32#include <signal.h>
33#include <assert.h>
f69f195a 34#include <stdlib.h>
6d841bc2 35#include <stdint.h>
f69f195a 36#include <string.h>
09a9f986 37#include <errno.h>
e8043c1b 38#include <poll.h>
27b012e2 39
999991c6 40#include "urcu/arch.h"
d73fb81f 41#include "urcu/wfcqueue.h"
57760d44 42#include "urcu/map/urcu.h"
af7c2dbe 43#include "urcu/static/urcu.h"
618b2595 44#include "urcu-pointer.h"
bd252a04 45#include "urcu/tls-compat.h"
71c811bf 46
4a6d7378 47#include "urcu-die.h"
5bffdd5d 48#include "urcu-wait.h"
4a6d7378 49
121a5d44 50/* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
71c811bf 51#undef _LGPL_SOURCE
27b012e2 52#include "urcu.h"
71c811bf 53#define _LGPL_SOURCE
27b012e2 54
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55/*
56 * If a reader is really non-cooperative and refuses to commit its
57 * rcu_active_readers count to memory (there is no barrier in the reader
9340c38d 58 * per-se), kick it after 10 loops waiting for it.
3a71751e 59 */
9340c38d 60#define KICK_READER_LOOPS 10
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61
62/*
63 * Active attempts to check for reader Q.S. before calling futex().
64 */
65#define RCU_QS_ACTIVE_ATTEMPTS 100
66
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67/* If the headers do not support membarrier system call, fall back on RCU_MB */
68#ifdef __NR_membarrier
69# define membarrier(...) syscall(__NR_membarrier, __VA_ARGS__)
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70#else
71# define membarrier(...) -ENOSYS
72#endif
73
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74enum membarrier_cmd {
75 MEMBARRIER_CMD_QUERY = 0,
76 MEMBARRIER_CMD_SHARED = (1 << 0),
77};
553b7eb9 78
fdf01eed 79#ifdef RCU_MEMBARRIER
834a45ba 80static int init_done;
1de4df4b 81int rcu_has_sys_membarrier;
834a45ba 82
02be5561 83void __attribute__((constructor)) rcu_init(void);
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84#endif
85
86#ifdef RCU_MB
02be5561 87void rcu_init(void)
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88{
89}
90#endif
8a5fb4c9 91
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92#ifdef RCU_SIGNAL
93static int init_done;
94
95void __attribute__((constructor)) rcu_init(void);
96void __attribute__((destructor)) rcu_exit(void);
97#endif
98
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99/*
100 * rcu_gp_lock ensures mutual exclusion between threads calling
101 * synchronize_rcu().
102 */
6abb4bd5 103static pthread_mutex_t rcu_gp_lock = PTHREAD_MUTEX_INITIALIZER;
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104/*
105 * rcu_registry_lock ensures mutual exclusion between threads
106 * registering and unregistering themselves to/from the registry, and
107 * with threads reading that registry from synchronize_rcu(). However,
108 * this lock is not held all the way through the completion of awaiting
109 * for the grace period. It is sporadically released between iterations
110 * on the registry.
111 * rcu_registry_lock may nest inside rcu_gp_lock.
112 */
113static pthread_mutex_t rcu_registry_lock = PTHREAD_MUTEX_INITIALIZER;
4de0cd31 114struct rcu_gp rcu_gp = { .ctr = RCU_GP_COUNT };
27b012e2 115
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116/*
117 * Written to only by each individual reader. Read by both the reader and the
118 * writers.
119 */
bd252a04 120DEFINE_URCU_TLS(struct rcu_reader, rcu_reader);
27b012e2 121
16aa9ee8 122static CDS_LIST_HEAD(registry);
27b012e2 123
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124/*
125 * Queue keeping threads awaiting to wait for a grace period. Contains
126 * struct gp_waiters_thread objects.
127 */
128static DEFINE_URCU_WAIT_QUEUE(gp_waiters);
129
6abb4bd5 130static void mutex_lock(pthread_mutex_t *mutex)
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131{
132 int ret;
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133
134#ifndef DISTRUST_SIGNALS_EXTREME
6abb4bd5 135 ret = pthread_mutex_lock(mutex);
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136 if (ret)
137 urcu_die(ret);
09a9f986 138#else /* #ifndef DISTRUST_SIGNALS_EXTREME */
6abb4bd5 139 while ((ret = pthread_mutex_trylock(mutex)) != 0) {
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140 if (ret != EBUSY && ret != EINTR)
141 urcu_die(ret);
bd252a04 142 if (CMM_LOAD_SHARED(URCU_TLS(rcu_reader).need_mb)) {
5481ddb3 143 cmm_smp_mb();
bd252a04 144 _CMM_STORE_SHARED(URCU_TLS(rcu_reader).need_mb, 0);
5481ddb3 145 cmm_smp_mb();
09a9f986 146 }
8999a9ee 147 (void) poll(NULL, 0, 10);
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148 }
149#endif /* #else #ifndef DISTRUST_SIGNALS_EXTREME */
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150}
151
6abb4bd5 152static void mutex_unlock(pthread_mutex_t *mutex)
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153{
154 int ret;
155
6abb4bd5 156 ret = pthread_mutex_unlock(mutex);
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157 if (ret)
158 urcu_die(ret);
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159}
160
fdf01eed 161#ifdef RCU_MEMBARRIER
a4922ed9 162static void smp_mb_master(void)
fdf01eed 163{
1de4df4b 164 if (caa_likely(rcu_has_sys_membarrier))
64f469e6 165 (void) membarrier(MEMBARRIER_CMD_SHARED, 0);
fdf01eed 166 else
5481ddb3 167 cmm_smp_mb();
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168}
169#endif
170
02be5561 171#ifdef RCU_MB
a4922ed9 172static void smp_mb_master(void)
40e140c9 173{
5481ddb3 174 cmm_smp_mb();
40e140c9 175}
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176#endif
177
178#ifdef RCU_SIGNAL
78ff9419 179static void force_mb_all_readers(void)
27b012e2 180{
02be5561 181 struct rcu_reader *index;
e3b0cef0 182
27b012e2 183 /*
5481ddb3 184 * Ask for each threads to execute a cmm_smp_mb() so we can consider the
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185 * compiler barriers around rcu read lock as real memory barriers.
186 */
16aa9ee8 187 if (cds_list_empty(&registry))
27b012e2 188 return;
3a86deba 189 /*
5481ddb3 190 * pthread_kill has a cmm_smp_mb(). But beware, we assume it performs
157dca95 191 * a cache flush on architectures with non-coherent cache. Let's play
5481ddb3 192 * safe and don't assume anything : we use cmm_smp_mc() to make sure the
157dca95 193 * cache flush is enforced.
3a86deba 194 */
16aa9ee8 195 cds_list_for_each_entry(index, &registry, node) {
6cf3827c 196 CMM_STORE_SHARED(index->need_mb, 1);
02be5561 197 pthread_kill(index->tid, SIGRCU);
09a9f986 198 }
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199 /*
200 * Wait for sighandler (and thus mb()) to execute on every thread.
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201 *
202 * Note that the pthread_kill() will never be executed on systems
203 * that correctly deliver signals in a timely manner. However, it
204 * is not uncommon for kernels to have bugs that can result in
205 * lost or unduly delayed signals.
206 *
207 * If you are seeing the below pthread_kill() executing much at
208 * all, we suggest testing the underlying kernel and filing the
209 * relevant bug report. For Linux kernels, we recommend getting
210 * the Linux Test Project (LTP).
27b012e2 211 */
16aa9ee8 212 cds_list_for_each_entry(index, &registry, node) {
6cf3827c 213 while (CMM_LOAD_SHARED(index->need_mb)) {
02be5561 214 pthread_kill(index->tid, SIGRCU);
8999a9ee 215 (void) poll(NULL, 0, 1);
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216 }
217 }
5481ddb3 218 cmm_smp_mb(); /* read ->need_mb before ending the barrier */
27b012e2 219}
9d7e3f89 220
a4922ed9 221static void smp_mb_master(void)
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222{
223 force_mb_all_readers();
224}
fdf01eed 225#endif /* #ifdef RCU_SIGNAL */
27b012e2 226
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227/*
228 * synchronize_rcu() waiting. Single thread.
229 */
cfe78e25 230static void wait_gp(void)
bc6c15bb 231{
cfe78e25 232 /* Read reader_gp before read futex */
a4922ed9 233 smp_mb_master();
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234 if (uatomic_read(&rcu_gp.futex) != -1)
235 return;
236 while (futex_async(&rcu_gp.futex, FUTEX_WAIT, -1,
237 NULL, NULL, 0)) {
238 switch (errno) {
239 case EWOULDBLOCK:
240 /* Value already changed. */
241 return;
242 case EINTR:
243 /* Retry if interrupted by signal. */
244 break; /* Get out of switch. */
245 default:
246 /* Unexpected error. */
247 urcu_die(errno);
248 }
249 }
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250}
251
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252/*
253 * Always called with rcu_registry lock held. Releases this lock between
254 * iterations and grabs it again. Holds the lock when it returns.
255 */
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256static void wait_for_readers(struct cds_list_head *input_readers,
257 struct cds_list_head *cur_snap_readers,
258 struct cds_list_head *qsreaders)
27b012e2 259{
9340c38d 260 unsigned int wait_loops = 0;
02be5561 261 struct rcu_reader *index, *tmp;
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262#ifdef HAS_INCOHERENT_CACHES
263 unsigned int wait_gp_loops = 0;
264#endif /* HAS_INCOHERENT_CACHES */
27b012e2 265
40e140c9 266 /*
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267 * Wait for each thread URCU_TLS(rcu_reader).ctr to either
268 * indicate quiescence (not nested), or observe the current
ed1b099e 269 * rcu_gp.ctr value.
27b012e2 270 */
cfe78e25 271 for (;;) {
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272 if (wait_loops < RCU_QS_ACTIVE_ATTEMPTS)
273 wait_loops++;
9340c38d 274 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
ed1b099e 275 uatomic_dec(&rcu_gp.futex);
cfe78e25 276 /* Write futex before read reader_gp */
a4922ed9 277 smp_mb_master();
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278 }
279
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280 cds_list_for_each_entry_safe(index, tmp, input_readers, node) {
281 switch (rcu_reader_state(&index->ctr)) {
282 case RCU_READER_ACTIVE_CURRENT:
283 if (cur_snap_readers) {
284 cds_list_move(&index->node,
285 cur_snap_readers);
286 break;
287 }
288 /* Fall-through */
289 case RCU_READER_INACTIVE:
290 cds_list_move(&index->node, qsreaders);
291 break;
292 case RCU_READER_ACTIVE_OLD:
293 /*
294 * Old snapshot. Leaving node in
295 * input_readers will make us busy-loop
296 * until the snapshot becomes current or
297 * the reader becomes inactive.
298 */
299 break;
300 }
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301 }
302
e8043c1b 303#ifndef HAS_INCOHERENT_CACHES
fd189fa5 304 if (cds_list_empty(input_readers)) {
9340c38d 305 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
cfe78e25 306 /* Read reader_gp before write futex */
a4922ed9 307 smp_mb_master();
ed1b099e 308 uatomic_set(&rcu_gp.futex, 0);
bc6c15bb 309 }
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310 break;
311 } else {
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312 /* Temporarily unlock the registry lock. */
313 mutex_unlock(&rcu_registry_lock);
9340c38d 314 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS)
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315 wait_gp();
316 else
06f22bdb 317 caa_cpu_relax();
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318 /* Re-lock the registry lock before the next loop. */
319 mutex_lock(&rcu_registry_lock);
bc6c15bb 320 }
e8043c1b 321#else /* #ifndef HAS_INCOHERENT_CACHES */
27b012e2 322 /*
40e140c9 323 * BUSY-LOOP. Force the reader thread to commit its
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324 * URCU_TLS(rcu_reader).ctr update to memory if we wait
325 * for too long.
27b012e2 326 */
fd189fa5 327 if (cds_list_empty(input_readers)) {
9340c38d 328 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
cfe78e25 329 /* Read reader_gp before write futex */
a4922ed9 330 smp_mb_master();
ed1b099e 331 uatomic_set(&rcu_gp.futex, 0);
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332 }
333 break;
334 } else {
9340c38d 335 if (wait_gp_loops == KICK_READER_LOOPS) {
a4922ed9 336 smp_mb_master();
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337 wait_gp_loops = 0;
338 }
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339 /* Temporarily unlock the registry lock. */
340 mutex_unlock(&rcu_registry_lock);
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341 if (wait_loops >= RCU_QS_ACTIVE_ATTEMPTS) {
342 wait_gp();
343 wait_gp_loops++;
344 } else {
06f22bdb 345 caa_cpu_relax();
40e140c9 346 }
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347 /* Re-lock the registry lock before the next loop. */
348 mutex_lock(&rcu_registry_lock);
40e140c9 349 }
e8043c1b 350#endif /* #else #ifndef HAS_INCOHERENT_CACHES */
27b012e2 351 }
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352}
353
9598a481 354void synchronize_rcu(void)
2bc59bd7 355{
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356 CDS_LIST_HEAD(cur_snap_readers);
357 CDS_LIST_HEAD(qsreaders);
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358 DEFINE_URCU_WAIT_NODE(wait, URCU_WAIT_WAITING);
359 struct urcu_waiters waiters;
360
361 /*
362 * Add ourself to gp_waiters queue of threads awaiting to wait
363 * for a grace period. Proceed to perform the grace period only
364 * if we are the first thread added into the queue.
365 * The implicit memory barrier before urcu_wait_add()
366 * orders prior memory accesses of threads put into the wait
367 * queue before their insertion into the wait queue.
368 */
369 if (urcu_wait_add(&gp_waiters, &wait) != 0) {
370 /* Not first in queue: will be awakened by another thread. */
371 urcu_adaptative_busy_wait(&wait);
372 /* Order following memory accesses after grace period. */
373 cmm_smp_mb();
374 return;
375 }
376 /* We won't need to wake ourself up */
377 urcu_wait_set_state(&wait, URCU_WAIT_RUNNING);
fd189fa5 378
6abb4bd5 379 mutex_lock(&rcu_gp_lock);
135530fd 380
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381 /*
382 * Move all waiters into our local queue.
383 */
384 urcu_move_waiters(&waiters, &gp_waiters);
385
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386 mutex_lock(&rcu_registry_lock);
387
16aa9ee8 388 if (cds_list_empty(&registry))
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389 goto out;
390
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391 /*
392 * All threads should read qparity before accessing data structure
393 * where new ptr points to. Must be done within rcu_registry_lock
394 * because it iterates on reader threads.
395 */
9598a481 396 /* Write new ptr before changing the qparity */
a4922ed9 397 smp_mb_master();
9598a481 398
9598a481 399 /*
c9488684 400 * Wait for readers to observe original parity or be quiescent.
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401 * wait_for_readers() can release and grab again rcu_registry_lock
402 * interally.
9598a481 403 */
fd189fa5 404 wait_for_readers(&registry, &cur_snap_readers, &qsreaders);
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405
406 /*
c9488684 407 * Must finish waiting for quiescent state for original parity before
ed1b099e 408 * committing next rcu_gp.ctr update to memory. Failure to do so could
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409 * result in the writer waiting forever while new readers are always
410 * accessing data (no progress). Enforce compiler-order of load
ed1b099e 411 * URCU_TLS(rcu_reader).ctr before store to rcu_gp.ctr.
9598a481 412 */
5481ddb3 413 cmm_barrier();
9598a481 414
5dba80f9 415 /*
5481ddb3 416 * Adding a cmm_smp_mb() which is _not_ formally required, but makes the
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417 * model easier to understand. It does not have a big performance impact
418 * anyway, given this is the write-side.
419 */
5481ddb3 420 cmm_smp_mb();
67c2d80b 421
c9488684 422 /* Switch parity: 0 -> 1, 1 -> 0 */
ed1b099e 423 CMM_STORE_SHARED(rcu_gp.ctr, rcu_gp.ctr ^ RCU_GP_CTR_PHASE);
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424
425 /*
ed1b099e 426 * Must commit rcu_gp.ctr update to memory before waiting for quiescent
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427 * state. Failure to do so could result in the writer waiting forever
428 * while new readers are always accessing data (no progress). Enforce
ed1b099e 429 * compiler-order of store to rcu_gp.ctr before load rcu_reader ctr.
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430 */
431 cmm_barrier();
432
433 /*
434 *
435 * Adding a cmm_smp_mb() which is _not_ formally required, but makes the
436 * model easier to understand. It does not have a big performance impact
437 * anyway, given this is the write-side.
438 */
439 cmm_smp_mb();
440
9598a481 441 /*
c9488684 442 * Wait for readers to observe new parity or be quiescent.
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443 * wait_for_readers() can release and grab again rcu_registry_lock
444 * interally.
9598a481 445 */
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446 wait_for_readers(&cur_snap_readers, NULL, &qsreaders);
447
448 /*
449 * Put quiescent reader list back into registry.
450 */
451 cds_list_splice(&qsreaders, &registry);
9598a481 452
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453 /*
454 * Finish waiting for reader threads before letting the old ptr
455 * being freed. Must be done within rcu_registry_lock because it
456 * iterates on reader threads.
457 */
a4922ed9 458 smp_mb_master();
2dfb8b5e 459out:
731ccb96 460 mutex_unlock(&rcu_registry_lock);
6abb4bd5 461 mutex_unlock(&rcu_gp_lock);
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462
463 /*
464 * Wakeup waiters only after we have completed the grace period
465 * and have ensured the memory barriers at the end of the grace
466 * period have been issued.
467 */
468 urcu_wake_all_waiters(&waiters);
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469}
470
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471/*
472 * library wrappers to be used by non-LGPL compatible source code.
473 */
474
475void rcu_read_lock(void)
476{
477 _rcu_read_lock();
478}
479
480void rcu_read_unlock(void)
481{
482 _rcu_read_unlock();
483}
484
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485int rcu_read_ongoing(void)
486{
487 return _rcu_read_ongoing();
488}
489
121a5d44 490void rcu_register_thread(void)
27b012e2 491{
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492 URCU_TLS(rcu_reader).tid = pthread_self();
493 assert(URCU_TLS(rcu_reader).need_mb == 0);
494 assert(!(URCU_TLS(rcu_reader).ctr & RCU_GP_CTR_NEST_MASK));
02be5561 495
731ccb96 496 mutex_lock(&rcu_registry_lock);
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497 assert(!URCU_TLS(rcu_reader).registered);
498 URCU_TLS(rcu_reader).registered = 1;
02be5561 499 rcu_init(); /* In case gcc does not support constructor attribute */
bd252a04 500 cds_list_add(&URCU_TLS(rcu_reader).node, &registry);
731ccb96 501 mutex_unlock(&rcu_registry_lock);
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502}
503
121a5d44 504void rcu_unregister_thread(void)
27b012e2 505{
731ccb96 506 mutex_lock(&rcu_registry_lock);
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507 assert(URCU_TLS(rcu_reader).registered);
508 URCU_TLS(rcu_reader).registered = 0;
bd252a04 509 cds_list_del(&URCU_TLS(rcu_reader).node);
731ccb96 510 mutex_unlock(&rcu_registry_lock);
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511}
512
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513#ifdef RCU_MEMBARRIER
514void rcu_init(void)
515{
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516 int ret;
517
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518 if (init_done)
519 return;
520 init_done = 1;
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521 ret = membarrier(MEMBARRIER_CMD_QUERY, 0);
522 if (ret >= 0 && (ret & MEMBARRIER_CMD_SHARED)) {
1de4df4b 523 rcu_has_sys_membarrier = 1;
64f469e6 524 }
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525}
526#endif
527
528#ifdef RCU_SIGNAL
02be5561 529static void sigrcu_handler(int signo, siginfo_t *siginfo, void *context)
27b012e2 530{
40e140c9 531 /*
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532 * Executing this cmm_smp_mb() is the only purpose of this signal handler.
533 * It punctually promotes cmm_barrier() into cmm_smp_mb() on every thread it is
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534 * executed on.
535 */
5481ddb3 536 cmm_smp_mb();
bd252a04 537 _CMM_STORE_SHARED(URCU_TLS(rcu_reader).need_mb, 0);
5481ddb3 538 cmm_smp_mb();
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539}
540
8a5fb4c9 541/*
02be5561 542 * rcu_init constructor. Called when the library is linked, but also when
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543 * reader threads are calling rcu_register_thread().
544 * Should only be called by a single thread at a given time. This is ensured by
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545 * holing the rcu_registry_lock from rcu_register_thread() or by running
546 * at library load time, which should not be executed by multiple
547 * threads nor concurrently with rcu_register_thread() anyway.
8a5fb4c9 548 */
02be5561 549void rcu_init(void)
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550{
551 struct sigaction act;
552 int ret;
553
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554 if (init_done)
555 return;
556 init_done = 1;
557
02be5561 558 act.sa_sigaction = sigrcu_handler;
dd052bd3 559 act.sa_flags = SA_SIGINFO | SA_RESTART;
c297c21c 560 sigemptyset(&act.sa_mask);
02be5561 561 ret = sigaction(SIGRCU, &act, NULL);
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562 if (ret)
563 urcu_die(errno);
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564}
565
02be5561 566void rcu_exit(void)
27b012e2 567{
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568 /*
569 * Don't unregister the SIGRCU signal handler anymore, because
570 * call_rcu threads could still be using it shortly before the
571 * application exits.
572 * Assertion disabled because call_rcu threads are now rcu
573 * readers, and left running at exit.
574 * assert(cds_list_empty(&registry));
575 */
27b012e2 576}
5e77fc1f 577
fdf01eed 578#endif /* #ifdef RCU_SIGNAL */
5e77fc1f 579
5e6b23a6 580DEFINE_RCU_FLAVOR(rcu_flavor);
541d828d 581
5e77fc1f 582#include "urcu-call-rcu-impl.h"
0376e7b2 583#include "urcu-defer-impl.h"
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