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_tpool_key_s {
44 ldap_pvt_thread_pool_keyfree_t *ltk_free;
45 } ldap_int_tpool_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_tpool_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 static ldap_pvt_thread_key_t ldap_tpool_key;
131 /* Context of the main thread */
132 static ldap_int_thread_userctx_t ldap_int_main_thrctx;
135 ldap_int_thread_pool_startup ( void )
137 ldap_int_main_thrctx.ltu_id = ldap_pvt_thread_self();
138 ldap_pvt_thread_key_create( &ldap_tpool_key );
139 return ldap_pvt_thread_mutex_init(&ldap_pvt_thread_pool_mutex);
143 ldap_int_thread_pool_shutdown ( void )
145 struct ldap_int_thread_pool_s *pool;
147 while ((pool = LDAP_STAILQ_FIRST(&ldap_int_thread_pool_list)) != NULL) {
148 (ldap_pvt_thread_pool_destroy)(&pool, 0); /* ignore thr_debug macro */
150 ldap_pvt_thread_mutex_destroy(&ldap_pvt_thread_pool_mutex);
151 ldap_pvt_thread_key_destroy( ldap_tpool_key );
156 /* Create a thread pool */
158 ldap_pvt_thread_pool_init (
159 ldap_pvt_thread_pool_t *tpool,
163 ldap_pvt_thread_pool_t pool;
166 /* multiple pools are currently not supported (ITS#4943) */
167 assert(!ldap_int_has_thread_pool);
169 if (! (0 <= max_threads && max_threads <= LDAP_MAXTHR))
175 pool = (ldap_pvt_thread_pool_t) LDAP_CALLOC(1,
176 sizeof(struct ldap_int_thread_pool_s));
178 if (pool == NULL) return(-1);
180 rc = ldap_pvt_thread_mutex_init(&pool->ltp_mutex);
183 rc = ldap_pvt_thread_cond_init(&pool->ltp_cond);
186 rc = ldap_pvt_thread_cond_init(&pool->ltp_pcond);
190 ldap_int_has_thread_pool = 1;
191 pool->ltp_state = LDAP_INT_THREAD_POOL_RUNNING;
192 pool->ltp_max_count = max_threads;
193 pool->ltp_max_pending = max_pending;
194 LDAP_STAILQ_INIT(&pool->ltp_pending_list);
195 LDAP_SLIST_INIT(&pool->ltp_free_list);
196 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
197 LDAP_STAILQ_INSERT_TAIL(&ldap_int_thread_pool_list, pool, ltp_next);
198 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
201 /* THIS WILL NOT WORK on some systems. If the process
202 * forks after starting a thread, there is no guarantee
203 * that the thread will survive the fork. For example,
204 * slapd forks in order to daemonize, and does so after
205 * calling ldap_pvt_thread_pool_init. On some systems,
206 * this initial thread does not run in the child process,
207 * but ltp_open_count == 1, so two things happen:
208 * 1) the first client connection fails, and 2) when
209 * slapd is kill'ed, it never terminates since it waits
210 * for all worker threads to exit. */
212 /* start up one thread, just so there is one. no need to
213 * lock the mutex right now, since no threads are running.
215 pool->ltp_open_count++;
217 ldap_pvt_thread_t thr;
218 rc = ldap_pvt_thread_create( &thr, 1, ldap_int_thread_pool_wrapper, pool );
221 /* couldn't start one? then don't start any */
222 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
223 LDAP_STAILQ_REMOVE(ldap_int_thread_pool_list, pool,
224 ldap_int_thread_pool_s, ltp_next);
225 ldap_int_has_thread_pool = 0;
226 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
227 ldap_pvt_thread_cond_destroy(&pool->ltp_pcond);
228 ldap_pvt_thread_cond_destroy(&pool->ltp_cond);
229 ldap_pvt_thread_mutex_destroy(&pool->ltp_mutex);
240 /* Submit a task to be performed by the thread pool */
242 ldap_pvt_thread_pool_submit (
243 ldap_pvt_thread_pool_t *tpool,
244 ldap_pvt_thread_start_t *start_routine, void *arg )
246 struct ldap_int_thread_pool_s *pool;
247 ldap_int_thread_task_t *task;
248 ldap_pvt_thread_t thr;
258 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
259 if (pool->ltp_state != LDAP_INT_THREAD_POOL_RUNNING
260 || (pool->ltp_max_pending
261 && pool->ltp_pending_count >= pool->ltp_max_pending))
263 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
267 task = LDAP_SLIST_FIRST(&pool->ltp_free_list);
269 LDAP_SLIST_REMOVE_HEAD(&pool->ltp_free_list, ltt_next.l);
271 task = (ldap_int_thread_task_t *) LDAP_MALLOC(sizeof(*task));
273 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
278 task->ltt_start_routine = start_routine;
281 pool->ltp_pending_count++;
282 LDAP_STAILQ_INSERT_TAIL(&pool->ltp_pending_list, task, ltt_next.q);
283 if (pool->ltp_pause) {
284 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
287 ldap_pvt_thread_cond_signal(&pool->ltp_cond);
288 if (pool->ltp_open_count < pool->ltp_active_count + pool->ltp_pending_count
289 && (pool->ltp_open_count <
290 (pool->ltp_max_count ? pool->ltp_max_count : LDAP_MAXTHR)))
292 pool->ltp_open_count++;
293 pool->ltp_starting++;
294 if (0 != ldap_pvt_thread_create(
295 &thr, 1, ldap_int_thread_pool_wrapper, pool))
297 /* couldn't create thread. back out of
298 * ltp_open_count and check for even worse things.
300 pool->ltp_starting--;
301 pool->ltp_open_count--;
302 if (pool->ltp_open_count == 0) {
303 /* no open threads at all?!?
305 ldap_int_thread_task_t *ptr;
307 /* let pool_destroy know there are no more threads */
308 ldap_pvt_thread_cond_signal(&pool->ltp_cond);
310 LDAP_STAILQ_FOREACH(ptr, &pool->ltp_pending_list, ltt_next.q)
311 if (ptr == task) break;
313 /* no open threads, task not handled, so
314 * back out of ltp_pending_count, free the task,
317 LDAP_STAILQ_REMOVE(&pool->ltp_pending_list, task,
318 ldap_int_thread_task_s, ltt_next.q);
319 pool->ltp_pending_count--;
320 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
325 /* there is another open thread, so this
326 * task will be handled eventually.
327 * continue on, we have signalled that
328 * the task is waiting.
333 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
337 /* Set max #threads. value <= 0 means max supported #threads (LDAP_MAXTHR) */
339 ldap_pvt_thread_pool_maxthreads(
340 ldap_pvt_thread_pool_t *tpool,
343 struct ldap_int_thread_pool_s *pool;
345 if (! (0 <= max_threads && max_threads <= LDAP_MAXTHR))
356 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
357 pool->ltp_max_count = max_threads;
358 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
362 /* Inspect the pool */
364 ldap_pvt_thread_pool_query(
365 ldap_pvt_thread_pool_t *tpool,
366 ldap_pvt_thread_pool_param_t param,
369 struct ldap_int_thread_pool_s *pool;
372 if ( tpool == NULL || value == NULL ) {
378 if ( pool == NULL ) {
382 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
384 case LDAP_PVT_THREAD_POOL_PARAM_MAX:
385 count = pool->ltp_max_count;
388 case LDAP_PVT_THREAD_POOL_PARAM_MAX_PENDING:
389 count = pool->ltp_max_pending;
392 case LDAP_PVT_THREAD_POOL_PARAM_OPEN:
393 count = pool->ltp_open_count;
396 case LDAP_PVT_THREAD_POOL_PARAM_STARTING:
397 count = pool->ltp_starting;
400 case LDAP_PVT_THREAD_POOL_PARAM_ACTIVE:
401 count = pool->ltp_active_count;
404 case LDAP_PVT_THREAD_POOL_PARAM_PAUSING:
405 count = pool->ltp_pause;
408 case LDAP_PVT_THREAD_POOL_PARAM_PENDING:
409 count = pool->ltp_pending_count;
412 case LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD:
413 count = pool->ltp_pending_count + pool->ltp_active_count;
416 case LDAP_PVT_THREAD_POOL_PARAM_ACTIVE_MAX:
419 case LDAP_PVT_THREAD_POOL_PARAM_PENDING_MAX:
422 case LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD_MAX:
425 case LDAP_PVT_THREAD_POOL_PARAM_STATE: {
428 ldap_int_thread_pool_state_t state;
430 { "running", LDAP_INT_THREAD_POOL_RUNNING },
431 { "finishing", LDAP_INT_THREAD_POOL_FINISHING },
432 { "stopping", LDAP_INT_THREAD_POOL_STOPPING },
437 if ( pool->ltp_pause ) {
438 *((char **)value) = "pausing";
440 for ( i = 0; str2state[ i ].name != NULL; i++ ) {
441 if ( str2state[ i ].state == pool->ltp_state ) {
445 *((char **)value) = str2state[ i ].name;
447 if ( *((char **)value) != NULL ) {
452 case LDAP_PVT_THREAD_POOL_PARAM_UNKNOWN:
455 ldap_pvt_thread_mutex_unlock( &pool->ltp_mutex );
458 *((int *)value) = count;
461 return ( count == -1 ? -1 : 0 );
465 * wrapper for ldap_pvt_thread_pool_query(), left around
466 * for backwards compatibility
469 ldap_pvt_thread_pool_backload ( ldap_pvt_thread_pool_t *tpool )
473 rc = ldap_pvt_thread_pool_query( tpool,
474 LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD, (void *)&count );
483 /* Destroy the pool after making its threads finish */
485 ldap_pvt_thread_pool_destroy ( ldap_pvt_thread_pool_t *tpool, int run_pending )
487 struct ldap_int_thread_pool_s *pool, *pptr;
488 ldap_int_thread_task_t *task;
495 if (pool == NULL) return(-1);
497 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
498 LDAP_STAILQ_FOREACH(pptr, &ldap_int_thread_pool_list, ltp_next)
499 if (pptr == pool) break;
501 LDAP_STAILQ_REMOVE(&ldap_int_thread_pool_list, pool,
502 ldap_int_thread_pool_s, ltp_next);
503 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
505 if (pool != pptr) return(-1);
507 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
508 pool->ltp_state = run_pending
509 ? LDAP_INT_THREAD_POOL_FINISHING
510 : LDAP_INT_THREAD_POOL_STOPPING;
512 while (pool->ltp_open_count) {
513 if (!pool->ltp_pause)
514 ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);
515 ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
517 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
519 while ((task = LDAP_STAILQ_FIRST(&pool->ltp_pending_list)) != NULL)
521 LDAP_STAILQ_REMOVE_HEAD(&pool->ltp_pending_list, ltt_next.q);
525 while ((task = LDAP_SLIST_FIRST(&pool->ltp_free_list)) != NULL)
527 LDAP_SLIST_REMOVE_HEAD(&pool->ltp_free_list, ltt_next.l);
531 ldap_pvt_thread_cond_destroy(&pool->ltp_pcond);
532 ldap_pvt_thread_cond_destroy(&pool->ltp_cond);
533 ldap_pvt_thread_mutex_destroy(&pool->ltp_mutex);
536 ldap_int_has_thread_pool = 0;
540 /* Thread loop. Accept and handle submitted tasks. */
542 ldap_int_thread_pool_wrapper (
545 struct ldap_int_thread_pool_s *pool = xpool;
546 ldap_int_thread_task_t *task;
547 ldap_int_thread_userctx_t ctx, *kctx;
548 unsigned i, keyslot, hash;
550 assert(pool != NULL);
552 for ( i=0; i<MAXKEYS; i++ ) {
553 ctx.ltu_key[i].ltk_key = NULL;
556 ctx.ltu_id = ldap_pvt_thread_self();
557 TID_HASH(ctx.ltu_id, hash);
559 ldap_pvt_thread_key_setdata( ldap_tpool_key, &ctx );
561 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
563 /* thread_keys[] is read-only when paused */
564 while (pool->ltp_pause)
565 ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
567 /* find a key slot to give this thread ID and store a
568 * pointer to our keys there; start at the thread ID
569 * itself (mod LDAP_MAXTHR) and look for an empty slot.
571 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
572 for (keyslot = hash & (LDAP_MAXTHR-1);
573 (kctx = thread_keys[keyslot].ctx) && kctx != DELETED_THREAD_CTX;
574 keyslot = (keyslot+1) & (LDAP_MAXTHR-1));
575 thread_keys[keyslot].ctx = &ctx;
576 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
578 pool->ltp_starting--;
581 while (pool->ltp_pause)
582 ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
584 if (pool->ltp_state == LDAP_INT_THREAD_POOL_STOPPING)
587 task = LDAP_STAILQ_FIRST(&pool->ltp_pending_list);
589 if (pool->ltp_state == LDAP_INT_THREAD_POOL_FINISHING)
592 if (pool->ltp_open_count >
593 (pool->ltp_max_count ? pool->ltp_max_count : LDAP_MAXTHR))
595 /* too many threads running (can happen if the
596 * maximum threads value is set during ongoing
597 * operation using ldap_pvt_thread_pool_maxthreads)
598 * so let this thread die.
603 /* we could check an idle timer here, and let the
604 * thread die if it has been inactive for a while.
605 * only die if there are other open threads (i.e.,
606 * always have at least one thread open). the check
607 * should be like this:
608 * if (pool->ltp_open_count > 1 && pool->ltp_starting == 0)
609 * check timer, wait if ltp_pause, leave thread (break;)
611 * Just use pthread_cond_timedwait if we want to
615 assert(pool->ltp_state == LDAP_INT_THREAD_POOL_RUNNING);
616 ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
620 LDAP_STAILQ_REMOVE_HEAD(&pool->ltp_pending_list, ltt_next.q);
621 pool->ltp_pending_count--;
622 pool->ltp_active_count++;
623 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
625 task->ltt_start_routine(&ctx, task->ltt_arg);
627 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
628 LDAP_SLIST_INSERT_HEAD(&pool->ltp_free_list, task, ltt_next.l);
629 pool->ltp_active_count--;
630 /* let pool_pause know when it is the sole active thread */
631 if (pool->ltp_active_count < 2)
632 ldap_pvt_thread_cond_signal(&pool->ltp_pcond);
635 /* The ltp_mutex lock protects ctx->ltu_key from pool_purgekey()
636 * during this call, since it prevents new pauses. */
637 ldap_pvt_thread_pool_context_reset(&ctx);
639 ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
640 thread_keys[keyslot].ctx = DELETED_THREAD_CTX;
641 ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
643 pool->ltp_open_count--;
644 /* let pool_destroy know we're all done */
645 if (pool->ltp_open_count < 1)
646 ldap_pvt_thread_cond_signal(&pool->ltp_cond);
648 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
650 ldap_pvt_thread_exit(NULL);
654 /* Pause the pool. Return when all other threads are paused. */
656 ldap_pvt_thread_pool_pause (
657 ldap_pvt_thread_pool_t *tpool )
659 struct ldap_int_thread_pool_s *pool;
669 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
671 /* If someone else has already requested a pause, we have to wait */
672 if (pool->ltp_pause) {
673 pool->ltp_pending_count++;
674 pool->ltp_active_count--;
675 /* let the other pool_pause() know when it can proceed */
676 if (pool->ltp_active_count < 2)
677 ldap_pvt_thread_cond_signal(&pool->ltp_pcond);
679 ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
680 } while (pool->ltp_pause);
681 pool->ltp_pending_count--;
682 pool->ltp_active_count++;
685 /* Wait for everyone else to pause or finish */
687 while (pool->ltp_active_count > 1) {
688 ldap_pvt_thread_cond_wait(&pool->ltp_pcond, &pool->ltp_mutex);
691 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
697 ldap_pvt_thread_pool_resume (
698 ldap_pvt_thread_pool_t *tpool )
700 struct ldap_int_thread_pool_s *pool;
710 ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
712 if (pool->ltp_state == LDAP_INT_THREAD_POOL_RUNNING)
713 ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);
714 ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
719 * Get the key's data and optionally free function in the given context.
721 int ldap_pvt_thread_pool_getkey(
725 ldap_pvt_thread_pool_keyfree_t **kfree )
727 ldap_int_thread_userctx_t *ctx = xctx;
730 if ( !ctx || !key || !data ) return EINVAL;
732 for ( i=0; i<MAXKEYS && ctx->ltu_key[i].ltk_key; i++ ) {
733 if ( ctx->ltu_key[i].ltk_key == key ) {
734 *data = ctx->ltu_key[i].ltk_data;
735 if ( kfree ) *kfree = ctx->ltu_key[i].ltk_free;
743 clear_key_idx( ldap_int_thread_userctx_t *ctx, int i )
745 for ( ; i < MAXKEYS-1 && ctx->ltu_key[i+1].ltk_key; i++ )
746 ctx->ltu_key[i] = ctx->ltu_key[i+1];
747 ctx->ltu_key[i].ltk_key = NULL;
751 * Set or remove data for the key in the given context.
752 * key can be any unique pointer.
753 * kfree() is an optional function to free the data (but not the key):
754 * pool_context_reset() and pool_purgekey() call kfree(key, data),
755 * but pool_setkey() does not. For pool_setkey() it is the caller's
756 * responsibility to free any existing data with the same key.
757 * kfree() must not call functions taking a tpool argument.
759 int ldap_pvt_thread_pool_setkey_x(
763 ldap_pvt_thread_pool_keyfree_t *kfree,
765 ldap_pvt_thread_pool_keyfree_t **oldkfreep )
767 ldap_int_thread_userctx_t *ctx = xctx;
770 if ( !ctx || !key ) return EINVAL;
772 for ( i=found=0; i<MAXKEYS; i++ ) {
773 if ( ctx->ltu_key[i].ltk_key == key ) {
776 } else if ( !ctx->ltu_key[i].ltk_key ) {
783 *olddatap = ctx->ltu_key[i].ltk_data;
791 *oldkfreep = ctx->ltu_key[i].ltk_free;
797 if ( data || kfree ) {
800 ctx->ltu_key[i].ltk_key = key;
801 ctx->ltu_key[i].ltk_data = data;
802 ctx->ltu_key[i].ltk_free = kfree;
803 } else if ( found ) {
804 clear_key_idx( ctx, i );
810 /* Free all elements with this key, no matter which thread they're in.
811 * May only be called while the pool is paused.
813 void ldap_pvt_thread_pool_purgekey( void *key )
816 ldap_int_thread_userctx_t *ctx;
818 assert ( key != NULL );
820 for ( i=0; i<LDAP_MAXTHR; i++ ) {
821 ctx = thread_keys[i].ctx;
822 if ( ctx && ctx != DELETED_THREAD_CTX ) {
823 for ( j=0; j<MAXKEYS && ctx->ltu_key[j].ltk_key; j++ ) {
824 if ( ctx->ltu_key[j].ltk_key == key ) {
825 if (ctx->ltu_key[j].ltk_free)
826 ctx->ltu_key[j].ltk_free( ctx->ltu_key[j].ltk_key,
827 ctx->ltu_key[j].ltk_data );
828 clear_key_idx( ctx, j );
837 * Find the context of the current thread.
838 * This is necessary if the caller does not have access to the
839 * thread context handle (for example, a slapd plugin calling
840 * slapi_search_internal()). No doubt it is more efficient
841 * for the application to keep track of the thread context
844 void *ldap_pvt_thread_pool_context( )
848 ldap_pvt_thread_key_getdata( ldap_tpool_key, &ctx );
849 return ctx ? ctx : &ldap_int_main_thrctx;
853 * Free the context's keys.
854 * Must not call functions taking a tpool argument (because this
855 * thread already holds ltp_mutex when called from pool_wrapper()).
857 void ldap_pvt_thread_pool_context_reset( void *vctx )
859 ldap_int_thread_userctx_t *ctx = vctx;
862 for ( i=MAXKEYS-1; i>=0; i--) {
863 if ( !ctx->ltu_key[i].ltk_key )
865 if ( ctx->ltu_key[i].ltk_free )
866 ctx->ltu_key[i].ltk_free( ctx->ltu_key[i].ltk_key,
867 ctx->ltu_key[i].ltk_data );
868 ctx->ltu_key[i].ltk_key = NULL;
872 ldap_pvt_thread_t ldap_pvt_thread_pool_tid( void *vctx )
874 ldap_int_thread_userctx_t *ctx = vctx;
878 #endif /* LDAP_THREAD_HAVE_TPOOL */