2 * Copyright (c) 2013, 2014, 2015, 2016 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 #include "ovs-thread.h"
27 #include "fatal-signal.h"
29 #include "openvswitch/list.h"
30 #include "netdev-dpdk.h"
32 #include "poll-loop.h"
34 #include "socket-util.h"
38 /* Omit the definitions in this file because they are somewhat difficult to
39 * write without prompting "sparse" complaints, without ugliness or
40 * cut-and-paste. Since "sparse" is just a checker, not a compiler, it
41 * doesn't matter that we don't define them. */
43 #include "openvswitch/vlog.h"
45 VLOG_DEFINE_THIS_MODULE(ovs_thread
);
47 /* If there is a reason that we cannot fork anymore (unless the fork will be
48 * immediately followed by an exec), then this points to a string that
50 static const char *must_not_fork
;
52 /* True if we created any threads beyond the main initial thread. */
53 static bool multithreaded
;
55 #define LOCK_FUNCTION(TYPE, FUN) \
57 ovs_##TYPE##_##FUN##_at(const struct ovs_##TYPE *l_, \
59 OVS_NO_THREAD_SAFETY_ANALYSIS \
61 struct ovs_##TYPE *l = CONST_CAST(struct ovs_##TYPE *, l_); \
64 /* Verify that 'l' was initialized. */ \
65 if (OVS_UNLIKELY(!l->where)) { \
66 ovs_abort(0, "%s: %s() passed uninitialized ovs_"#TYPE, \
70 error = pthread_##TYPE##_##FUN(&l->lock); \
71 if (OVS_UNLIKELY(error)) { \
72 ovs_abort(error, "%s: pthread_%s_%s failed", where, #TYPE, #FUN); \
76 LOCK_FUNCTION(mutex
, lock
);
77 LOCK_FUNCTION(rwlock
, rdlock
);
78 LOCK_FUNCTION(rwlock
, wrlock
);
80 #define TRY_LOCK_FUNCTION(TYPE, FUN) \
82 ovs_##TYPE##_##FUN##_at(const struct ovs_##TYPE *l_, \
84 OVS_NO_THREAD_SAFETY_ANALYSIS \
86 struct ovs_##TYPE *l = CONST_CAST(struct ovs_##TYPE *, l_); \
89 /* Verify that 'l' was initialized. */ \
90 if (OVS_UNLIKELY(!l->where)) { \
91 ovs_abort(0, "%s: %s() passed uninitialized ovs_"#TYPE, \
95 error = pthread_##TYPE##_##FUN(&l->lock); \
96 if (OVS_UNLIKELY(error) && error != EBUSY) { \
97 ovs_abort(error, "%s: pthread_%s_%s failed", where, #TYPE, #FUN); \
104 TRY_LOCK_FUNCTION(mutex
, trylock
);
105 TRY_LOCK_FUNCTION(rwlock
, tryrdlock
);
106 TRY_LOCK_FUNCTION(rwlock
, trywrlock
);
108 #define UNLOCK_FUNCTION(TYPE, FUN, WHERE) \
110 ovs_##TYPE##_##FUN(const struct ovs_##TYPE *l_) \
111 OVS_NO_THREAD_SAFETY_ANALYSIS \
113 struct ovs_##TYPE *l = CONST_CAST(struct ovs_##TYPE *, l_); \
116 /* Verify that 'l' was initialized. */ \
117 ovs_assert(l->where); \
120 error = pthread_##TYPE##_##FUN(&l->lock); \
121 if (OVS_UNLIKELY(error)) { \
122 ovs_abort(error, "pthread_%s_%s failed", #TYPE, #FUN); \
125 UNLOCK_FUNCTION(mutex
, unlock
, "<unlocked>");
126 UNLOCK_FUNCTION(mutex
, destroy
, NULL
);
127 UNLOCK_FUNCTION(rwlock
, unlock
, "<unlocked>");
128 UNLOCK_FUNCTION(rwlock
, destroy
, NULL
);
130 #define XPTHREAD_FUNC1(FUNCTION, PARAM1) \
132 x##FUNCTION(PARAM1 arg1) \
134 int error = FUNCTION(arg1); \
135 if (OVS_UNLIKELY(error)) { \
136 ovs_abort(error, "%s failed", #FUNCTION); \
139 #define XPTHREAD_FUNC2(FUNCTION, PARAM1, PARAM2) \
141 x##FUNCTION(PARAM1 arg1, PARAM2 arg2) \
143 int error = FUNCTION(arg1, arg2); \
144 if (OVS_UNLIKELY(error)) { \
145 ovs_abort(error, "%s failed", #FUNCTION); \
148 #define XPTHREAD_FUNC3(FUNCTION, PARAM1, PARAM2, PARAM3)\
150 x##FUNCTION(PARAM1 arg1, PARAM2 arg2, PARAM3 arg3) \
152 int error = FUNCTION(arg1, arg2, arg3); \
153 if (OVS_UNLIKELY(error)) { \
154 ovs_abort(error, "%s failed", #FUNCTION); \
158 XPTHREAD_FUNC1(pthread_mutex_lock
, pthread_mutex_t
*);
159 XPTHREAD_FUNC1(pthread_mutex_unlock
, pthread_mutex_t
*);
160 XPTHREAD_FUNC1(pthread_mutexattr_init
, pthread_mutexattr_t
*);
161 XPTHREAD_FUNC1(pthread_mutexattr_destroy
, pthread_mutexattr_t
*);
162 XPTHREAD_FUNC2(pthread_mutexattr_settype
, pthread_mutexattr_t
*, int);
163 XPTHREAD_FUNC2(pthread_mutexattr_gettype
, pthread_mutexattr_t
*, int *);
165 XPTHREAD_FUNC1(pthread_rwlockattr_init
, pthread_rwlockattr_t
*);
166 XPTHREAD_FUNC1(pthread_rwlockattr_destroy
, pthread_rwlockattr_t
*);
167 #ifdef PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
168 XPTHREAD_FUNC2(pthread_rwlockattr_setkind_np
, pthread_rwlockattr_t
*, int);
171 XPTHREAD_FUNC2(pthread_cond_init
, pthread_cond_t
*, pthread_condattr_t
*);
172 XPTHREAD_FUNC1(pthread_cond_destroy
, pthread_cond_t
*);
173 XPTHREAD_FUNC1(pthread_cond_signal
, pthread_cond_t
*);
174 XPTHREAD_FUNC1(pthread_cond_broadcast
, pthread_cond_t
*);
176 XPTHREAD_FUNC2(pthread_join
, pthread_t
, void **);
178 typedef void destructor_func(void *);
179 XPTHREAD_FUNC2(pthread_key_create
, pthread_key_t
*, destructor_func
*);
180 XPTHREAD_FUNC1(pthread_key_delete
, pthread_key_t
);
181 XPTHREAD_FUNC2(pthread_setspecific
, pthread_key_t
, const void *);
184 XPTHREAD_FUNC3(pthread_sigmask
, int, const sigset_t
*, sigset_t
*);
188 ovs_mutex_init__(const struct ovs_mutex
*l_
, int type
)
190 struct ovs_mutex
*l
= CONST_CAST(struct ovs_mutex
*, l_
);
191 pthread_mutexattr_t attr
;
194 l
->where
= "<unlocked>";
195 xpthread_mutexattr_init(&attr
);
196 xpthread_mutexattr_settype(&attr
, type
);
197 error
= pthread_mutex_init(&l
->lock
, &attr
);
198 if (OVS_UNLIKELY(error
)) {
199 ovs_abort(error
, "pthread_mutex_init failed");
201 xpthread_mutexattr_destroy(&attr
);
204 /* Initializes 'mutex' as a normal (non-recursive) mutex. */
206 ovs_mutex_init(const struct ovs_mutex
*mutex
)
208 ovs_mutex_init__(mutex
, PTHREAD_MUTEX_ERRORCHECK
);
211 /* Initializes 'mutex' as a recursive mutex. */
213 ovs_mutex_init_recursive(const struct ovs_mutex
*mutex
)
215 ovs_mutex_init__(mutex
, PTHREAD_MUTEX_RECURSIVE
);
218 /* Initializes 'mutex' as a recursive mutex. */
220 ovs_mutex_init_adaptive(const struct ovs_mutex
*mutex
)
222 #ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
223 ovs_mutex_init__(mutex
, PTHREAD_MUTEX_ADAPTIVE_NP
);
225 ovs_mutex_init(mutex
);
230 ovs_rwlock_init(const struct ovs_rwlock
*l_
)
232 struct ovs_rwlock
*l
= CONST_CAST(struct ovs_rwlock
*, l_
);
233 pthread_rwlockattr_t attr
;
236 l
->where
= "<unlocked>";
238 xpthread_rwlockattr_init(&attr
);
239 #ifdef PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
240 xpthread_rwlockattr_setkind_np(
241 &attr
, PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
);
243 error
= pthread_rwlock_init(&l
->lock
, NULL
);
244 if (OVS_UNLIKELY(error
)) {
245 ovs_abort(error
, "pthread_rwlock_init failed");
247 xpthread_rwlockattr_destroy(&attr
);
250 /* Provides an error-checking wrapper around pthread_cond_wait().
252 * If the wait can take a significant amount of time, consider bracketing this
253 * call with calls to ovsrcu_quiesce_start() and ovsrcu_quiesce_end(). */
255 ovs_mutex_cond_wait(pthread_cond_t
*cond
, const struct ovs_mutex
*mutex_
)
257 struct ovs_mutex
*mutex
= CONST_CAST(struct ovs_mutex
*, mutex_
);
260 error
= pthread_cond_wait(cond
, &mutex
->lock
);
262 if (OVS_UNLIKELY(error
)) {
263 ovs_abort(error
, "pthread_cond_wait failed");
267 /* Initializes the 'barrier'. 'size' is the number of threads
268 * expected to hit the barrier. */
270 ovs_barrier_init(struct ovs_barrier
*barrier
, uint32_t size
)
272 barrier
->size
= size
;
273 atomic_count_init(&barrier
->count
, 0);
274 barrier
->seq
= seq_create();
277 /* Destroys the 'barrier'. */
279 ovs_barrier_destroy(struct ovs_barrier
*barrier
)
281 seq_destroy(barrier
->seq
);
284 /* Makes the calling thread block on the 'barrier' until all
285 * 'barrier->size' threads hit the barrier.
286 * ovs_barrier provides the necessary acquire-release semantics to make
287 * the effects of prior memory accesses of all the participating threads
288 * visible on return and to prevent the following memory accesses to be
289 * reordered before the ovs_barrier_block(). */
291 ovs_barrier_block(struct ovs_barrier
*barrier
)
293 uint64_t seq
= seq_read(barrier
->seq
);
296 orig
= atomic_count_inc(&barrier
->count
);
297 if (orig
+ 1 == barrier
->size
) {
298 atomic_count_set(&barrier
->count
, 0);
299 /* seq_change() serves as a release barrier against the other threads,
300 * so the zeroed count is visible to them as they continue. */
301 seq_change(barrier
->seq
);
303 /* To prevent thread from waking up by other event,
304 * keeps waiting for the change of 'barrier->seq'. */
305 while (seq
== seq_read(barrier
->seq
)) {
306 seq_wait(barrier
->seq
, seq
);
312 DEFINE_EXTERN_PER_THREAD_DATA(ovsthread_id
, 0);
314 struct ovsthread_aux
{
315 void *(*start
)(void *);
321 ovsthread_wrapper(void *aux_
)
323 static atomic_count next_id
= ATOMIC_COUNT_INIT(1);
325 struct ovsthread_aux
*auxp
= aux_
;
326 struct ovsthread_aux aux
;
329 id
= atomic_count_inc(&next_id
);
330 *ovsthread_id_get() = id
;
335 /* The order of the following calls is important, because
336 * ovsrcu_quiesce_end() saves a copy of the thread name. */
337 char *subprogram_name
= xasprintf("%s%u", aux
.name
, id
);
338 set_subprogram_name(subprogram_name
);
339 free(subprogram_name
);
340 ovsrcu_quiesce_end();
342 return aux
.start(aux
.arg
);
346 set_min_stack_size(pthread_attr_t
*attr
, size_t min_stacksize
)
351 error
= pthread_attr_getstacksize(attr
, &stacksize
);
353 ovs_abort(error
, "pthread_attr_getstacksize failed");
356 if (stacksize
< min_stacksize
) {
357 error
= pthread_attr_setstacksize(attr
, min_stacksize
);
359 ovs_abort(error
, "pthread_attr_setstacksize failed");
364 /* Starts a thread that calls 'start(arg)'. Sets the thread's name to 'name'
365 * (suffixed by its ovsthread_id()). Returns the new thread's pthread_t. */
367 ovs_thread_create(const char *name
, void *(*start
)(void *), void *arg
)
369 static struct ovsthread_once once
= OVSTHREAD_ONCE_INITIALIZER
;
370 struct ovsthread_aux
*aux
;
374 forbid_forking("multiple threads exist");
375 multithreaded
= true;
377 if (ovsthread_once_start(&once
)) {
378 /* The first call to this function has to happen in the main thread.
379 * Before the process becomes multithreaded we make sure that the
380 * main thread is considered non quiescent.
382 * For other threads this is done in ovs_thread_wrapper(), but the
383 * main thread has no such wrapper.
385 * There's no reason to call ovsrcu_quiesce_end() in subsequent
386 * invocations of this function and it might introduce problems
387 * for other threads. */
388 ovsrcu_quiesce_end();
389 ovsthread_once_done(&once
);
392 aux
= xmalloc(sizeof *aux
);
395 ovs_strlcpy(aux
->name
, name
, sizeof aux
->name
);
397 /* Some small systems use a default stack size as small as 80 kB, but OVS
398 * requires approximately 384 kB according to the following analysis:
399 * http://openvswitch.org/pipermail/dev/2016-January/065049.html
401 * We use 512 kB to give us some margin of error. */
403 pthread_attr_init(&attr
);
404 set_min_stack_size(&attr
, 512 * 1024);
406 error
= pthread_create(&thread
, &attr
, ovsthread_wrapper
, aux
);
408 ovs_abort(error
, "pthread_create failed");
410 pthread_attr_destroy(&attr
);
415 ovsthread_once_start__(struct ovsthread_once
*once
)
417 ovs_mutex_lock(&once
->mutex
);
418 /* Mutex synchronizes memory, so we get the current value of 'done'. */
422 ovs_mutex_unlock(&once
->mutex
);
427 ovsthread_once_done(struct ovsthread_once
*once
)
429 /* We need release semantics here, so that the following store may not
430 * be moved ahead of any of the preceding initialization operations.
431 * A release atomic_thread_fence provides that prior memory accesses
432 * will not be reordered to take place after the following store. */
433 atomic_thread_fence(memory_order_release
);
435 ovs_mutex_unlock(&once
->mutex
);
439 single_threaded(void)
441 return !multithreaded
;
444 /* Asserts that the process has not yet created any threads (beyond the initial
447 * ('where' is used in logging. Commonly one would use
448 * assert_single_threaded() to automatically provide the caller's source file
449 * and line number for 'where'.) */
451 assert_single_threaded_at(const char *where
)
454 VLOG_FATAL("%s: attempted operation not allowed when multithreaded",
460 /* Forks the current process (checking that this is allowed). Aborts with
461 * VLOG_FATAL if fork() returns an error, and otherwise returns the value
462 * returned by fork().
464 * ('where' is used in logging. Commonly one would use xfork() to
465 * automatically provide the caller's source file and line number for
468 xfork_at(const char *where
)
473 VLOG_FATAL("%s: attempted to fork but forking not allowed (%s)",
474 where
, must_not_fork
);
479 VLOG_FATAL("%s: fork failed (%s)", where
, ovs_strerror(errno
));
485 /* Notes that the process must not call fork() from now on, for the specified
486 * 'reason'. (The process may still fork() if it execs itself immediately
489 forbid_forking(const char *reason
)
491 ovs_assert(reason
!= NULL
);
492 must_not_fork
= reason
;
495 /* Returns true if the process is allowed to fork, false otherwise. */
499 return !must_not_fork
;
502 /* ovsthread_stats. */
505 ovsthread_stats_init(struct ovsthread_stats
*stats
)
509 ovs_mutex_init(&stats
->mutex
);
510 for (i
= 0; i
< ARRAY_SIZE(stats
->buckets
); i
++) {
511 stats
->buckets
[i
] = NULL
;
516 ovsthread_stats_destroy(struct ovsthread_stats
*stats
)
518 ovs_mutex_destroy(&stats
->mutex
);
522 ovsthread_stats_bucket_get(struct ovsthread_stats
*stats
,
523 void *(*new_bucket
)(void))
525 unsigned int idx
= ovsthread_id_self() & (ARRAY_SIZE(stats
->buckets
) - 1);
526 void *bucket
= stats
->buckets
[idx
];
528 ovs_mutex_lock(&stats
->mutex
);
529 bucket
= stats
->buckets
[idx
];
531 bucket
= stats
->buckets
[idx
] = new_bucket();
533 ovs_mutex_unlock(&stats
->mutex
);
539 ovs_thread_stats_next_bucket(const struct ovsthread_stats
*stats
, size_t i
)
541 for (; i
< ARRAY_SIZE(stats
->buckets
); i
++) {
542 if (stats
->buckets
[i
]) {
550 /* Returns the total number of cores available to this process, or 0 if the
551 * number cannot be determined. */
553 count_cpu_cores(void)
555 static struct ovsthread_once once
= OVSTHREAD_ONCE_INITIALIZER
;
556 static long int n_cores
;
558 if (ovsthread_once_start(&once
)) {
560 n_cores
= sysconf(_SC_NPROCESSORS_ONLN
);
563 cpu_set_t
*set
= CPU_ALLOC(n_cores
);
566 size_t size
= CPU_ALLOC_SIZE(n_cores
);
568 if (!sched_getaffinity(0, size
, set
)) {
569 n_cores
= CPU_COUNT_S(size
, set
);
577 GetSystemInfo(&sysinfo
);
578 n_cores
= sysinfo
.dwNumberOfProcessors
;
580 ovsthread_once_done(&once
);
583 return n_cores
> 0 ? n_cores
: 0;
586 /* Returns 'true' if current thread is PMD thread. */
590 const char *name
= get_subprogram_name();
591 return !strncmp(name
, "pmd", 3);
599 #define MAX_KEYS (L1_SIZE * L2_SIZE)
601 /* A piece of thread-specific data. */
602 struct ovsthread_key
{
603 struct ovs_list list_node
; /* In 'inuse_keys' or 'free_keys'. */
604 void (*destructor
)(void *); /* Called at thread exit. */
606 /* Indexes into the per-thread array in struct ovsthread_key_slots.
607 * This key's data is stored in p1[index / L2_SIZE][index % L2_SIZE]. */
611 /* Per-thread data structure. */
612 struct ovsthread_key_slots
{
613 struct ovs_list list_node
; /* In 'slots_list'. */
617 /* Contains "struct ovsthread_key_slots *". */
618 static pthread_key_t tsd_key
;
620 /* Guards data structures below. */
621 static struct ovs_mutex key_mutex
= OVS_MUTEX_INITIALIZER
;
623 /* 'inuse_keys' holds "struct ovsthread_key"s that have been created and not
626 * 'free_keys' holds "struct ovsthread_key"s that have been deleted and are
627 * ready for reuse. (We keep them around only to be able to easily locate
630 * Together, 'inuse_keys' and 'free_keys' hold an ovsthread_key for every index
631 * from 0 to n_keys - 1, inclusive. */
632 static struct ovs_list inuse_keys
OVS_GUARDED_BY(key_mutex
)
633 = OVS_LIST_INITIALIZER(&inuse_keys
);
634 static struct ovs_list free_keys
OVS_GUARDED_BY(key_mutex
)
635 = OVS_LIST_INITIALIZER(&free_keys
);
636 static unsigned int n_keys
OVS_GUARDED_BY(key_mutex
);
638 /* All existing struct ovsthread_key_slots. */
639 static struct ovs_list slots_list
OVS_GUARDED_BY(key_mutex
)
640 = OVS_LIST_INITIALIZER(&slots_list
);
643 clear_slot(struct ovsthread_key_slots
*slots
, unsigned int index
)
645 void **p2
= slots
->p1
[index
/ L2_SIZE
];
647 void **valuep
= &p2
[index
% L2_SIZE
];
648 void *value
= *valuep
;
657 ovsthread_key_destruct__(void *slots_
)
659 struct ovsthread_key_slots
*slots
= slots_
;
660 struct ovsthread_key
*key
;
664 ovs_mutex_lock(&key_mutex
);
665 ovs_list_remove(&slots
->list_node
);
666 LIST_FOR_EACH (key
, list_node
, &inuse_keys
) {
667 void *value
= clear_slot(slots
, key
->index
);
668 if (value
&& key
->destructor
) {
669 key
->destructor(value
);
673 ovs_mutex_unlock(&key_mutex
);
675 for (i
= 0; i
< DIV_ROUND_UP(n
, L2_SIZE
); i
++) {
681 /* Cancels the callback to ovsthread_key_destruct__().
683 * Cancelling the call to the destructor during the main thread exit
684 * is needed while using pthreads-win32 library in Windows. It has been
685 * observed that in pthreads-win32, a call to the destructor during
686 * main thread exit causes undefined behavior. */
688 ovsthread_cancel_ovsthread_key_destruct__(void *aux OVS_UNUSED
)
690 pthread_setspecific(tsd_key
, NULL
);
693 /* Initializes '*keyp' as a thread-specific data key. The data items are
694 * initially null in all threads.
696 * If a thread exits with non-null data, then 'destructor', if nonnull, will be
697 * called passing the final data value as its argument. 'destructor' must not
698 * call any thread-specific data functions in this API.
700 * This function is similar to xpthread_key_create(). */
702 ovsthread_key_create(ovsthread_key_t
*keyp
, void (*destructor
)(void *))
704 static struct ovsthread_once once
= OVSTHREAD_ONCE_INITIALIZER
;
705 struct ovsthread_key
*key
;
707 if (ovsthread_once_start(&once
)) {
708 xpthread_key_create(&tsd_key
, ovsthread_key_destruct__
);
709 fatal_signal_add_hook(ovsthread_cancel_ovsthread_key_destruct__
,
711 ovsthread_once_done(&once
);
714 ovs_mutex_lock(&key_mutex
);
715 if (ovs_list_is_empty(&free_keys
)) {
716 key
= xmalloc(sizeof *key
);
717 key
->index
= n_keys
++;
718 if (key
->index
>= MAX_KEYS
) {
722 key
= CONTAINER_OF(ovs_list_pop_back(&free_keys
),
723 struct ovsthread_key
, list_node
);
725 ovs_list_push_back(&inuse_keys
, &key
->list_node
);
726 key
->destructor
= destructor
;
727 ovs_mutex_unlock(&key_mutex
);
732 /* Frees 'key'. The destructor supplied to ovsthread_key_create(), if any, is
735 * This function is similar to xpthread_key_delete(). */
737 ovsthread_key_delete(ovsthread_key_t key
)
739 struct ovsthread_key_slots
*slots
;
741 ovs_mutex_lock(&key_mutex
);
743 /* Move 'key' from 'inuse_keys' to 'free_keys'. */
744 ovs_list_remove(&key
->list_node
);
745 ovs_list_push_back(&free_keys
, &key
->list_node
);
747 /* Clear this slot in all threads. */
748 LIST_FOR_EACH (slots
, list_node
, &slots_list
) {
749 clear_slot(slots
, key
->index
);
752 ovs_mutex_unlock(&key_mutex
);
756 ovsthread_key_lookup__(const struct ovsthread_key
*key
)
758 struct ovsthread_key_slots
*slots
;
761 slots
= pthread_getspecific(tsd_key
);
763 slots
= xzalloc(sizeof *slots
);
765 ovs_mutex_lock(&key_mutex
);
766 pthread_setspecific(tsd_key
, slots
);
767 ovs_list_push_back(&slots_list
, &slots
->list_node
);
768 ovs_mutex_unlock(&key_mutex
);
771 p2
= slots
->p1
[key
->index
/ L2_SIZE
];
773 p2
= xzalloc(L2_SIZE
* sizeof *p2
);
774 slots
->p1
[key
->index
/ L2_SIZE
] = p2
;
777 return &p2
[key
->index
% L2_SIZE
];
780 /* Sets the value of thread-specific data item 'key', in the current thread, to
783 * This function is similar to pthread_setspecific(). */
785 ovsthread_setspecific(ovsthread_key_t key
, const void *value
)
787 *ovsthread_key_lookup__(key
) = CONST_CAST(void *, value
);
790 /* Returns the value of thread-specific data item 'key' in the current thread.
792 * This function is similar to pthread_getspecific(). */
794 ovsthread_getspecific(ovsthread_key_t key
)
796 return *ovsthread_key_lookup__(key
);