2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 * Copyright 1998-2007 The OpenLDAP Foundation.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted only as authorized by the OpenLDAP
11 * A copy of this license is available in file LICENSE in the
12 * top-level directory of the distribution or, alternatively, at
13 * <http://www.OpenLDAP.org/license.html>.
20 #include <ac/stdarg.h>
21 #include <ac/stdlib.h>
22 #include <ac/string.h>
27 #include "ldap_pvt_thread.h" /* Get the thread interface */
28 #include "ldap_queue.h"
29 #define LDAP_THREAD_POOL_IMPLEMENTATION
30 #include "ldap_thr_debug.h" /* May rename symbols defined below */
32 #ifndef LDAP_THREAD_HAVE_TPOOL
34 typedef enum ldap_int_thread_pool_state_e {
35 LDAP_INT_THREAD_POOL_RUNNING,
36 LDAP_INT_THREAD_POOL_FINISHING,
37 LDAP_INT_THREAD_POOL_STOPPING
38 } ldap_int_thread_pool_state_t;
40 /* Thread-specific key with data and optional free function */
41 typedef struct ldap_int_thread_key_s {
44 ldap_pvt_thread_pool_keyfree_t *ltk_free;
45 } ldap_int_thread_key_t;
47 /* Max number of thread-specific keys we store per thread.
48 * We don't expect to use many...
52 /* Max number of threads */
53 #define LDAP_MAXTHR 1024 /* must be a power of 2 */
55 /* Context: thread ID and thread-specific key/data pairs */
56 typedef struct ldap_int_thread_userctx_s {
57 ldap_pvt_thread_t ltu_id;
58 ldap_int_thread_key_t ltu_key[MAXKEYS];
59 } ldap_int_thread_userctx_t;
62 /* Simple {thread ID -> context} hash table; key=ctx->ltu_id.
63 * Protected by ldap_pvt_thread_pool_mutex except during pauses,
64 * when it is read-only (used by pool_purgekey and pool_context).
65 * Protected by tpool->ltp_mutex during pauses.
68 ldap_int_thread_userctx_t *ctx;
69 /* ctx is valid when not NULL or DELETED_THREAD_CTX */
70 # define DELETED_THREAD_CTX (&ldap_int_main_thrctx + 1) /* dummy addr */
71 } thread_keys[LDAP_MAXTHR];
73 #define TID_HASH(tid, hash) do { \
74 unsigned const char *ptr_ = (unsigned const char *)&(tid); \
76 for (i_ = 0, (hash) = ptr_[0]; ++i_ < sizeof(tid);) \
77 (hash) += ((hash) << 5) ^ ptr_[i_]; \
81 /* Task for a thread to perform */
82 typedef struct ldap_int_thread_task_s {
84 LDAP_STAILQ_ENTRY(ldap_int_thread_task_s) q;
85 LDAP_SLIST_ENTRY(ldap_int_thread_task_s) l;
87 ldap_pvt_thread_start_t *ltt_start_routine;
89 } ldap_int_thread_task_t;
91 struct ldap_int_thread_pool_s {
92 LDAP_STAILQ_ENTRY(ldap_int_thread_pool_s) ltp_next;
94 /* protect members below, and protect thread_keys[] during pauses */
95 ldap_pvt_thread_mutex_t ltp_mutex;
97 /* not paused and something to do for pool_<wrapper/pause/destroy>() */
98 ldap_pvt_thread_cond_t ltp_cond;
100 /* ltp_active_count <= 1 && ltp_pause */
101 ldap_pvt_thread_cond_t ltp_pcond;
103 /* pending tasks, and unused task objects */
104 LDAP_STAILQ_HEAD(tcq, ldap_int_thread_task_s) ltp_pending_list;
105 LDAP_SLIST_HEAD(tcl, ldap_int_thread_task_s) ltp_free_list;
107 ldap_int_thread_pool_state_t ltp_state;
109 /* some active request needs to be the sole active request */
112 long ltp_max_count; /* max number of threads in pool, or 0 */
113 long ltp_max_pending; /* max pending or paused requests, or 0 */
114 long ltp_pending_count; /* pending or paused requests */
115 long ltp_active_count; /* active, not paused requests */
116 long ltp_open_count; /* number of threads */
117 long ltp_starting; /* currenlty starting threads */
120 static int ldap_int_has_thread_pool = 0;
121 static LDAP_STAILQ_HEAD(tpq, ldap_int_thread_pool_s)
122 ldap_int_thread_pool_list =
123 LDAP_STAILQ_HEAD_INITIALIZER(ldap_int_thread_pool_list);
125 static ldap_pvt_thread_mutex_t ldap_pvt_thread_pool_mutex;
127 static void *ldap_int_thread_pool_wrapper( void *pool );
129 /* Context of the main thread */
130 static ldap_int_thread_userctx_t ldap_int_main_thrctx;
133 ldap_int_thread_pool_startup ( void )
135 ldap_int_main_thrctx.ltu_id = ldap_pvt_thread_self();
136 return ldap_pvt_thread_mutex_init(&ldap_pvt_thread_pool_mutex);
140 ldap_int_thread_pool_shutdown ( void )
142 struct ldap_int_thread_pool_s *pool;
144 while ((pool = LDAP_STAILQ_FIRST(&ldap_int_thread_pool_list)) != NULL) {
145 (ldap_pvt_thread_pool_destroy)(&pool, 0); /* ignore thr_debug macro */
147 ldap_pvt_thread_mutex_destroy(&ldap_pvt_thread_pool_mutex);
152 /* Create a thread pool */
154 ldap_pvt_thread_pool_init (
155 ldap_pvt_thread_pool_t *tpool,
159 ldap_pvt_thread_pool_t pool;
162 /* multiple pools are currently not supported (ITS#4943) */
163 assert(!ldap_int_has_thread_pool);
165 if (! (0 <= max_threads && max_threads <= LDAP_MAXTHR))
171 pool = (ldap_pvt_thread_pool_t) LDAP_CALLOC(1,
172 sizeof(struct ldap_int_thread_pool_s));
174 if (pool == NULL) return(-1);
176 rc = ldap_pvt_thread_mutex_init(&pool->ltp_mutex);
179 rc = ldap_pvt_thread_cond_init(&pool->ltp_cond);
182 rc = ldap_pvt_thread_cond_init(&pool->ltp_pcond);
186 ldap_int_has_thread_pool = 1;
187 pool->ltp_state = LDAP_INT_THREAD_POOL_RUNNING;
188 pool->ltp_max_count = max_threads;
189 pool->ltp_max_pending = max_pending;
190 LDAP_STAILQ_INIT(&pool->ltp_pending_list);
191 LDAP_SLIST_INIT(&pool->ltp_free_list);
192 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
193 LDAP_STAILQ_INSERT_TAIL(&ldap_int_thread_pool_list, pool, ltp_next);
194 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
197 /* THIS WILL NOT WORK on some systems. If the process
198 * forks after starting a thread, there is no guarantee
199 * that the thread will survive the fork. For example,
200 * slapd forks in order to daemonize, and does so after
201 * calling ldap_pvt_thread_pool_init. On some systems,
202 * this initial thread does not run in the child process,
203 * but ltp_open_count == 1, so two things happen:
204 * 1) the first client connection fails, and 2) when
205 * slapd is kill'ed, it never terminates since it waits
206 * for all worker threads to exit. */
208 /* start up one thread, just so there is one. no need to
209 * lock the mutex right now, since no threads are running.
211 pool->ltp_open_count++;
213 ldap_pvt_thread_t thr;
214 rc = ldap_pvt_thread_create( &thr, 1, ldap_int_thread_pool_wrapper, pool );
217 /* couldn't start one? then don't start any */
218 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
219 LDAP_STAILQ_REMOVE(ldap_int_thread_pool_list, pool,
220 ldap_int_thread_pool_s, ltp_next);
221 ldap_int_has_thread_pool = 0;
222 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
223 ldap_pvt_thread_cond_destroy(&pool->ltp_pcond);
224 ldap_pvt_thread_cond_destroy(&pool->ltp_cond);
225 ldap_pvt_thread_mutex_destroy(&pool->ltp_mutex);
236 /* Submit a task to be performed by the thread pool */
238 ldap_pvt_thread_pool_submit (
239 ldap_pvt_thread_pool_t *tpool,
240 ldap_pvt_thread_start_t *start_routine, void *arg )
242 struct ldap_int_thread_pool_s *pool;
243 ldap_int_thread_task_t *task;
244 ldap_pvt_thread_t thr;
254 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
255 if (pool->ltp_state != LDAP_INT_THREAD_POOL_RUNNING
256 || (pool->ltp_max_pending
257 && pool->ltp_pending_count >= pool->ltp_max_pending))
259 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
263 task = LDAP_SLIST_FIRST(&pool->ltp_free_list);
265 LDAP_SLIST_REMOVE_HEAD(&pool->ltp_free_list, ltt_next.l);
267 task = (ldap_int_thread_task_t *) LDAP_MALLOC(sizeof(*task));
269 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
274 task->ltt_start_routine = start_routine;
277 pool->ltp_pending_count++;
278 LDAP_STAILQ_INSERT_TAIL(&pool->ltp_pending_list, task, ltt_next.q);
279 if (pool->ltp_pause) {
280 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
283 ldap_pvt_thread_cond_signal(&pool->ltp_cond);
284 if (pool->ltp_open_count < pool->ltp_active_count + pool->ltp_pending_count
285 && (pool->ltp_open_count <
286 (pool->ltp_max_count ? pool->ltp_max_count : LDAP_MAXTHR)))
288 pool->ltp_open_count++;
289 pool->ltp_starting++;
290 if (0 != ldap_pvt_thread_create(
291 &thr, 1, ldap_int_thread_pool_wrapper, pool))
293 /* couldn't create thread. back out of
294 * ltp_open_count and check for even worse things.
296 pool->ltp_starting--;
297 pool->ltp_open_count--;
298 if (pool->ltp_open_count == 0) {
299 /* no open threads at all?!?
301 ldap_int_thread_task_t *ptr;
303 /* let pool_destroy know there are no more threads */
304 ldap_pvt_thread_cond_signal(&pool->ltp_cond);
306 LDAP_STAILQ_FOREACH(ptr, &pool->ltp_pending_list, ltt_next.q)
307 if (ptr == task) break;
309 /* no open threads, task not handled, so
310 * back out of ltp_pending_count, free the task,
313 LDAP_STAILQ_REMOVE(&pool->ltp_pending_list, task,
314 ldap_int_thread_task_s, ltt_next.q);
315 pool->ltp_pending_count--;
316 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
321 /* there is another open thread, so this
322 * task will be handled eventually.
323 * continue on, we have signalled that
324 * the task is waiting.
329 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
333 /* Set max #threads. value <= 0 means max supported #threads (LDAP_MAXTHR) */
335 ldap_pvt_thread_pool_maxthreads(
336 ldap_pvt_thread_pool_t *tpool,
339 struct ldap_int_thread_pool_s *pool;
341 if (! (0 <= max_threads && max_threads <= LDAP_MAXTHR))
352 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
353 pool->ltp_max_count = max_threads;
354 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
358 /* Inspect the pool */
360 ldap_pvt_thread_pool_query(
361 ldap_pvt_thread_pool_t *tpool,
362 ldap_pvt_thread_pool_param_t param,
365 struct ldap_int_thread_pool_s *pool;
368 if ( tpool == NULL || value == NULL ) {
374 if ( pool == NULL ) {
378 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
380 case LDAP_PVT_THREAD_POOL_PARAM_MAX:
381 count = pool->ltp_max_count;
384 case LDAP_PVT_THREAD_POOL_PARAM_MAX_PENDING:
385 count = pool->ltp_max_pending;
388 case LDAP_PVT_THREAD_POOL_PARAM_OPEN:
389 count = pool->ltp_open_count;
392 case LDAP_PVT_THREAD_POOL_PARAM_STARTING:
393 count = pool->ltp_starting;
396 case LDAP_PVT_THREAD_POOL_PARAM_ACTIVE:
397 count = pool->ltp_active_count;
400 case LDAP_PVT_THREAD_POOL_PARAM_PAUSING:
401 count = pool->ltp_pause;
404 case LDAP_PVT_THREAD_POOL_PARAM_PENDING:
405 count = pool->ltp_pending_count;
408 case LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD:
409 count = pool->ltp_pending_count + pool->ltp_active_count;
412 case LDAP_PVT_THREAD_POOL_PARAM_ACTIVE_MAX:
415 case LDAP_PVT_THREAD_POOL_PARAM_PENDING_MAX:
418 case LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD_MAX:
421 case LDAP_PVT_THREAD_POOL_PARAM_STATE: {
424 ldap_int_thread_pool_state_t state;
426 { "running", LDAP_INT_THREAD_POOL_RUNNING },
427 { "finishing", LDAP_INT_THREAD_POOL_FINISHING },
428 { "stopping", LDAP_INT_THREAD_POOL_STOPPING },
433 if ( pool->ltp_pause ) {
434 *((char **)value) = "pausing";
436 for ( i = 0; str2state[ i ].name != NULL; i++ ) {
437 if ( str2state[ i ].state == pool->ltp_state ) {
441 *((char **)value) = str2state[ i ].name;
443 if ( *((char **)value) != NULL ) {
448 case LDAP_PVT_THREAD_POOL_PARAM_UNKNOWN:
451 ldap_pvt_thread_mutex_unlock( &pool->ltp_mutex );
454 *((int *)value) = count;
457 return ( count == -1 ? -1 : 0 );
461 * wrapper for ldap_pvt_thread_pool_query(), left around
462 * for backwards compatibility
465 ldap_pvt_thread_pool_backload ( ldap_pvt_thread_pool_t *tpool )
469 rc = ldap_pvt_thread_pool_query( tpool,
470 LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD, (void *)&count );
479 /* Destroy the pool after making its threads finish */
481 ldap_pvt_thread_pool_destroy ( ldap_pvt_thread_pool_t *tpool, int run_pending )
483 struct ldap_int_thread_pool_s *pool, *pptr;
484 ldap_int_thread_task_t *task;
491 if (pool == NULL) return(-1);
493 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
494 LDAP_STAILQ_FOREACH(pptr, &ldap_int_thread_pool_list, ltp_next)
495 if (pptr == pool) break;
497 LDAP_STAILQ_REMOVE(&ldap_int_thread_pool_list, pool,
498 ldap_int_thread_pool_s, ltp_next);
499 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
501 if (pool != pptr) return(-1);
503 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
504 pool->ltp_state = run_pending
505 ? LDAP_INT_THREAD_POOL_FINISHING
506 : LDAP_INT_THREAD_POOL_STOPPING;
508 while (pool->ltp_open_count) {
509 if (!pool->ltp_pause)
510 ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);
511 ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
513 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
515 while ((task = LDAP_STAILQ_FIRST(&pool->ltp_pending_list)) != NULL)
517 LDAP_STAILQ_REMOVE_HEAD(&pool->ltp_pending_list, ltt_next.q);
521 while ((task = LDAP_SLIST_FIRST(&pool->ltp_free_list)) != NULL)
523 LDAP_SLIST_REMOVE_HEAD(&pool->ltp_free_list, ltt_next.l);
527 ldap_pvt_thread_cond_destroy(&pool->ltp_pcond);
528 ldap_pvt_thread_cond_destroy(&pool->ltp_cond);
529 ldap_pvt_thread_mutex_destroy(&pool->ltp_mutex);
531 ldap_int_has_thread_pool = 0;
535 /* Thread loop. Accept and handle submitted tasks. */
537 ldap_int_thread_pool_wrapper (
540 struct ldap_int_thread_pool_s *pool = xpool;
541 ldap_int_thread_task_t *task;
542 ldap_int_thread_userctx_t ctx, *kctx;
543 unsigned i, keyslot, hash;
545 assert(pool != NULL);
547 for ( i=0; i<MAXKEYS; i++ ) {
548 ctx.ltu_key[i].ltk_key = NULL;
551 ctx.ltu_id = ldap_pvt_thread_self();
552 TID_HASH(ctx.ltu_id, hash);
554 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
556 /* thread_keys[] is read-only when paused */
557 while (pool->ltp_pause)
558 ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
560 /* find a key slot to give this thread ID and store a
561 * pointer to our keys there; start at the thread ID
562 * itself (mod LDAP_MAXTHR) and look for an empty slot.
564 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
565 for (keyslot = hash & (LDAP_MAXTHR-1);
566 (kctx = thread_keys[keyslot].ctx) && kctx != DELETED_THREAD_CTX;
567 keyslot = (keyslot+1) & (LDAP_MAXTHR-1));
568 thread_keys[keyslot].ctx = &ctx;
569 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
571 pool->ltp_starting--;
574 while (pool->ltp_pause)
575 ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
577 if (pool->ltp_state == LDAP_INT_THREAD_POOL_STOPPING)
580 task = LDAP_STAILQ_FIRST(&pool->ltp_pending_list);
582 if (pool->ltp_state == LDAP_INT_THREAD_POOL_FINISHING)
585 if (pool->ltp_open_count >
586 (pool->ltp_max_count ? pool->ltp_max_count : LDAP_MAXTHR))
588 /* too many threads running (can happen if the
589 * maximum threads value is set during ongoing
590 * operation using ldap_pvt_thread_pool_maxthreads)
591 * so let this thread die.
596 /* we could check an idle timer here, and let the
597 * thread die if it has been inactive for a while.
598 * only die if there are other open threads (i.e.,
599 * always have at least one thread open). the check
600 * should be like this:
601 * if (pool->ltp_open_count > 1 && pool->ltp_starting == 0)
602 * check timer, wait if ltp_pause, leave thread (break;)
604 * Just use pthread_cond_timedwait if we want to
608 assert(pool->ltp_state == LDAP_INT_THREAD_POOL_RUNNING);
609 ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
613 LDAP_STAILQ_REMOVE_HEAD(&pool->ltp_pending_list, ltt_next.q);
614 pool->ltp_pending_count--;
615 pool->ltp_active_count++;
616 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
618 task->ltt_start_routine(&ctx, task->ltt_arg);
620 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
621 LDAP_SLIST_INSERT_HEAD(&pool->ltp_free_list, task, ltt_next.l);
622 pool->ltp_active_count--;
623 /* let pool_pause know when it is the sole active thread */
624 if (pool->ltp_active_count < 2)
625 ldap_pvt_thread_cond_signal(&pool->ltp_pcond);
628 /* The ltp_mutex lock protects ctx->ltu_key from pool_purgekey()
629 * during this call, since it prevents new pauses. */
630 ldap_pvt_thread_pool_context_reset(&ctx);
632 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
633 thread_keys[keyslot].ctx = DELETED_THREAD_CTX;
634 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
636 pool->ltp_open_count--;
637 /* let pool_destroy know we're all done */
638 if (pool->ltp_open_count < 1)
639 ldap_pvt_thread_cond_signal(&pool->ltp_cond);
641 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
643 ldap_pvt_thread_exit(NULL);
647 /* Pause the pool. Return when all other threads are paused. */
649 ldap_pvt_thread_pool_pause (
650 ldap_pvt_thread_pool_t *tpool )
652 struct ldap_int_thread_pool_s *pool;
662 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
664 /* If someone else has already requested a pause, we have to wait */
665 if (pool->ltp_pause) {
666 pool->ltp_pending_count++;
667 pool->ltp_active_count--;
668 /* let the other pool_pause() know when it can proceed */
669 if (pool->ltp_active_count < 2)
670 ldap_pvt_thread_cond_signal(&pool->ltp_pcond);
672 ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
673 } while (pool->ltp_pause);
674 pool->ltp_pending_count--;
675 pool->ltp_active_count++;
678 /* Wait for everyone else to pause or finish */
680 while (pool->ltp_active_count > 1) {
681 ldap_pvt_thread_cond_wait(&pool->ltp_pcond, &pool->ltp_mutex);
684 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
690 ldap_pvt_thread_pool_resume (
691 ldap_pvt_thread_pool_t *tpool )
693 struct ldap_int_thread_pool_s *pool;
703 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
705 if (pool->ltp_state == LDAP_INT_THREAD_POOL_RUNNING)
706 ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);
707 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
712 * Get the key's data and optionally free function in the given context.
714 int ldap_pvt_thread_pool_getkey(
718 ldap_pvt_thread_pool_keyfree_t **kfree )
720 ldap_int_thread_userctx_t *ctx = xctx;
723 if ( !ctx || !key || !data ) return EINVAL;
725 for ( i=0; i<MAXKEYS && ctx->ltu_key[i].ltk_key; i++ ) {
726 if ( ctx->ltu_key[i].ltk_key == key ) {
727 *data = ctx->ltu_key[i].ltk_data;
728 if ( kfree ) *kfree = ctx->ltu_key[i].ltk_free;
736 clear_key_idx( ldap_int_thread_userctx_t *ctx, int i )
738 for ( ; i < MAXKEYS-1 && ctx->ltu_key[i+1].ltk_key; i++ )
739 ctx->ltu_key[i] = ctx->ltu_key[i+1];
740 ctx->ltu_key[i].ltk_key = NULL;
744 * Set or remove data for the key in the given context.
745 * key can be any unique pointer.
746 * kfree() is an optional function to free the data (but not the key):
747 * pool_context_reset() and pool_purgekey() call kfree(key, data),
748 * but pool_setkey() does not. For pool_setkey() it is the caller's
749 * responsibility to free any existing data with the same key.
750 * kfree() must not call functions taking a tpool argument.
752 int ldap_pvt_thread_pool_setkey(
756 ldap_pvt_thread_pool_keyfree_t *kfree )
758 ldap_int_thread_userctx_t *ctx = xctx;
761 if ( !ctx || !key ) return EINVAL;
763 for ( i=found=0; i<MAXKEYS; i++ ) {
764 if ( ctx->ltu_key[i].ltk_key == key ) {
767 } else if ( !ctx->ltu_key[i].ltk_key ) {
772 if ( data || kfree ) {
775 ctx->ltu_key[i].ltk_key = key;
776 ctx->ltu_key[i].ltk_data = data;
777 ctx->ltu_key[i].ltk_free = kfree;
778 } else if ( found ) {
779 clear_key_idx( ctx, i );
785 /* Free all elements with this key, no matter which thread they're in.
786 * May only be called while the pool is paused.
788 void ldap_pvt_thread_pool_purgekey( void *key )
791 ldap_int_thread_userctx_t *ctx;
793 assert ( key != NULL );
795 for ( i=0; i<LDAP_MAXTHR; i++ ) {
796 ctx = thread_keys[i].ctx;
797 if ( ctx && ctx != DELETED_THREAD_CTX ) {
798 for ( j=0; j<MAXKEYS && ctx->ltu_key[j].ltk_key; j++ ) {
799 if ( ctx->ltu_key[j].ltk_key == key ) {
800 if (ctx->ltu_key[j].ltk_free)
801 ctx->ltu_key[j].ltk_free( ctx->ltu_key[j].ltk_key,
802 ctx->ltu_key[j].ltk_data );
803 clear_key_idx( ctx, j );
812 * Find the context of the current thread.
813 * This is necessary if the caller does not have access to the
814 * thread context handle (for example, a slapd plugin calling
815 * slapi_search_internal()). No doubt it is more efficient
816 * for the application to keep track of the thread context
819 void *ldap_pvt_thread_pool_context( )
821 ldap_pvt_thread_t tid;
823 ldap_int_thread_userctx_t *ctx;
825 tid = ldap_pvt_thread_self();
826 if ( ldap_pvt_thread_equal( tid, ldap_int_main_thrctx.ltu_id ))
827 return &ldap_int_main_thrctx;
829 TID_HASH( tid, hash );
830 i = hash &= (LDAP_MAXTHR-1);
831 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
833 ctx = thread_keys[i].ctx;
834 if ( ctx == DELETED_THREAD_CTX )
836 if ( !ctx || ldap_pvt_thread_equal(thread_keys[i].ctx->ltu_id, tid) )
838 } while ( (i = (i+1) & (LDAP_MAXTHR-1)) != hash );
841 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
847 * Free the context's keys.
848 * Must not call functions taking a tpool argument (because this
849 * thread already holds ltp_mutex when called from pool_wrapper()).
851 void ldap_pvt_thread_pool_context_reset( void *vctx )
853 ldap_int_thread_userctx_t *ctx = vctx;
856 for ( i=MAXKEYS-1; i>=0; i--) {
857 if ( !ctx->ltu_key[i].ltk_key )
859 if ( ctx->ltu_key[i].ltk_free )
860 ctx->ltu_key[i].ltk_free( ctx->ltu_key[i].ltk_key,
861 ctx->ltu_key[i].ltk_data );
862 ctx->ltu_key[i].ltk_key = NULL;
866 ldap_pvt_thread_t ldap_pvt_thread_pool_tid( void *vctx )
868 ldap_int_thread_userctx_t *ctx = vctx;
872 #endif /* LDAP_THREAD_HAVE_TPOOL */