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-rw-r--r--libraries/libldap/tpool.c1474
1 files changed, 1474 insertions, 0 deletions
diff --git a/libraries/libldap/tpool.c b/libraries/libldap/tpool.c
new file mode 100644
index 0000000..797d59e
--- /dev/null
+++ b/libraries/libldap/tpool.c
@@ -0,0 +1,1474 @@
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/signal.h>
+#include <ac/stdarg.h>
+#include <ac/stdlib.h>
+#include <ac/string.h>
+#include <ac/time.h>
+#include <ac/errno.h>
+
+#include "ldap-int.h"
+
+#ifdef LDAP_R_COMPILE
+
+#include "ldap_pvt_thread.h" /* Get the thread interface */
+#include "ldap_queue.h"
+#define LDAP_THREAD_POOL_IMPLEMENTATION
+#include "ldap_thr_debug.h" /* May rename symbols defined below */
+
+#ifndef LDAP_THREAD_HAVE_TPOOL
+
+#ifndef CACHELINE
+#define CACHELINE 64
+#endif
+
+/* Thread-specific key with data and optional free function */
+typedef struct ldap_int_tpool_key_s {
+ void *ltk_key;
+ void *ltk_data;
+ ldap_pvt_thread_pool_keyfree_t *ltk_free;
+} ldap_int_tpool_key_t;
+
+/* Max number of thread-specific keys we store per thread.
+ * We don't expect to use many...
+ */
+#define MAXKEYS 32
+
+/* Max number of threads */
+#define LDAP_MAXTHR 1024 /* must be a power of 2 */
+
+/* (Theoretical) max number of pending requests */
+#define MAX_PENDING (INT_MAX/2) /* INT_MAX - (room to avoid overflow) */
+
+/* pool->ltp_pause values */
+enum { NOT_PAUSED = 0, WANT_PAUSE = 1, PAUSED = 2 };
+
+/* Context: thread ID and thread-specific key/data pairs */
+typedef struct ldap_int_thread_userctx_s {
+ struct ldap_int_thread_poolq_s *ltu_pq;
+ ldap_pvt_thread_t ltu_id;
+ ldap_int_tpool_key_t ltu_key[MAXKEYS];
+} ldap_int_thread_userctx_t;
+
+
+/* Simple {thread ID -> context} hash table; key=ctx->ltu_id.
+ * Protected by ldap_pvt_thread_pool_mutex.
+ */
+static struct {
+ ldap_int_thread_userctx_t *ctx;
+ /* ctx is valid when not NULL or DELETED_THREAD_CTX */
+# define DELETED_THREAD_CTX (&ldap_int_main_thrctx + 1) /* dummy addr */
+} thread_keys[LDAP_MAXTHR];
+
+#define TID_HASH(tid, hash) do { \
+ unsigned const char *ptr_ = (unsigned const char *)&(tid); \
+ unsigned i_; \
+ for (i_ = 0, (hash) = ptr_[0]; ++i_ < sizeof(tid);) \
+ (hash) += ((hash) << 5) ^ ptr_[i_]; \
+} while(0)
+
+
+/* Task for a thread to perform */
+typedef struct ldap_int_thread_task_s {
+ union {
+ LDAP_STAILQ_ENTRY(ldap_int_thread_task_s) q;
+ LDAP_SLIST_ENTRY(ldap_int_thread_task_s) l;
+ } ltt_next;
+ ldap_pvt_thread_start_t *ltt_start_routine;
+ void *ltt_arg;
+ struct ldap_int_thread_poolq_s *ltt_queue;
+} ldap_int_thread_task_t;
+
+typedef LDAP_STAILQ_HEAD(tcq, ldap_int_thread_task_s) ldap_int_tpool_plist_t;
+
+struct ldap_int_thread_poolq_s {
+ void *ltp_free;
+
+ struct ldap_int_thread_pool_s *ltp_pool;
+
+ /* protect members below */
+ ldap_pvt_thread_mutex_t ltp_mutex;
+
+ /* not paused and something to do for pool_<wrapper/pause/destroy>()
+ * Used for normal pool operation, to synch between submitter and
+ * worker threads. Not used for pauses. In normal operation multiple
+ * queues can rendezvous without acquiring the main pool lock.
+ */
+ ldap_pvt_thread_cond_t ltp_cond;
+
+ /* ltp_pause == 0 ? &ltp_pending_list : &empty_pending_list,
+ * maintained to reduce work for pool_wrapper()
+ */
+ ldap_int_tpool_plist_t *ltp_work_list;
+
+ /* pending tasks, and unused task objects */
+ ldap_int_tpool_plist_t ltp_pending_list;
+ LDAP_SLIST_HEAD(tcl, ldap_int_thread_task_s) ltp_free_list;
+
+ /* Max number of threads in this queue */
+ int ltp_max_count;
+
+ /* Max pending + paused + idle tasks, negated when ltp_finishing */
+ int ltp_max_pending;
+
+ int ltp_pending_count; /* Pending + paused + idle tasks */
+ int ltp_active_count; /* Active, not paused/idle tasks */
+ int ltp_open_count; /* Number of threads */
+ int ltp_starting; /* Currently starting threads */
+};
+
+struct ldap_int_thread_pool_s {
+ LDAP_STAILQ_ENTRY(ldap_int_thread_pool_s) ltp_next;
+
+ struct ldap_int_thread_poolq_s **ltp_wqs;
+
+ /* number of poolqs */
+ int ltp_numqs;
+
+ /* protect members below */
+ ldap_pvt_thread_mutex_t ltp_mutex;
+
+ /* paused and waiting for resume
+ * When a pause is in effect all workers switch to waiting on
+ * this cond instead of their per-queue cond.
+ */
+ ldap_pvt_thread_cond_t ltp_cond;
+
+ /* ltp_active_queues < 1 && ltp_pause */
+ ldap_pvt_thread_cond_t ltp_pcond;
+
+ /* number of active queues */
+ int ltp_active_queues;
+
+ /* The pool is finishing, waiting for its threads to close.
+ * They close when ltp_pending_list is done. pool_submit()
+ * rejects new tasks. ltp_max_pending = -(its old value).
+ */
+ int ltp_finishing;
+
+ /* Some active task needs to be the sole active task.
+ * Atomic variable so ldap_pvt_thread_pool_pausing() can read it.
+ */
+ volatile sig_atomic_t ltp_pause;
+
+ /* Max number of threads in pool */
+ int ltp_max_count;
+
+ /* Configured max number of threads in pool, 0 for default (LDAP_MAXTHR) */
+ int ltp_conf_max_count;
+
+ /* Max pending + paused + idle tasks, negated when ltp_finishing */
+ int ltp_max_pending;
+};
+
+static ldap_int_tpool_plist_t empty_pending_list =
+ LDAP_STAILQ_HEAD_INITIALIZER(empty_pending_list);
+
+static int ldap_int_has_thread_pool = 0;
+static LDAP_STAILQ_HEAD(tpq, ldap_int_thread_pool_s)
+ ldap_int_thread_pool_list =
+ LDAP_STAILQ_HEAD_INITIALIZER(ldap_int_thread_pool_list);
+
+static ldap_pvt_thread_mutex_t ldap_pvt_thread_pool_mutex;
+
+static void *ldap_int_thread_pool_wrapper( void *pool );
+
+static ldap_pvt_thread_key_t ldap_tpool_key;
+
+/* Context of the main thread */
+static ldap_int_thread_userctx_t ldap_int_main_thrctx;
+
+int
+ldap_int_thread_pool_startup ( void )
+{
+ ldap_int_main_thrctx.ltu_id = ldap_pvt_thread_self();
+ ldap_pvt_thread_key_create( &ldap_tpool_key );
+ return ldap_pvt_thread_mutex_init(&ldap_pvt_thread_pool_mutex);
+}
+
+int
+ldap_int_thread_pool_shutdown ( void )
+{
+ struct ldap_int_thread_pool_s *pool;
+
+ while ((pool = LDAP_STAILQ_FIRST(&ldap_int_thread_pool_list)) != NULL) {
+ (ldap_pvt_thread_pool_destroy)(&pool, 0); /* ignore thr_debug macro */
+ }
+ ldap_pvt_thread_mutex_destroy(&ldap_pvt_thread_pool_mutex);
+ ldap_pvt_thread_key_destroy( ldap_tpool_key );
+ return(0);
+}
+
+
+/* Create a thread pool */
+int
+ldap_pvt_thread_pool_init_q (
+ ldap_pvt_thread_pool_t *tpool,
+ int max_threads,
+ int max_pending,
+ int numqs )
+{
+ ldap_pvt_thread_pool_t pool;
+ struct ldap_int_thread_poolq_s *pq;
+ int i, rc, rem_thr, rem_pend;
+
+ /* multiple pools are currently not supported (ITS#4943) */
+ assert(!ldap_int_has_thread_pool);
+
+ if (! (0 <= max_threads && max_threads <= LDAP_MAXTHR))
+ max_threads = 0;
+ if (! (1 <= max_pending && max_pending <= MAX_PENDING))
+ max_pending = MAX_PENDING;
+
+ *tpool = NULL;
+ pool = (ldap_pvt_thread_pool_t) LDAP_CALLOC(1,
+ sizeof(struct ldap_int_thread_pool_s));
+
+ if (pool == NULL) return(-1);
+
+ pool->ltp_wqs = LDAP_MALLOC(numqs * sizeof(struct ldap_int_thread_poolq_s *));
+ if (pool->ltp_wqs == NULL) {
+ LDAP_FREE(pool);
+ return(-1);
+ }
+
+ for (i=0; i<numqs; i++) {
+ char *ptr = LDAP_CALLOC(1, sizeof(struct ldap_int_thread_poolq_s) + CACHELINE-1);
+ if (ptr == NULL) {
+ for (--i; i>=0; i--)
+ LDAP_FREE(pool->ltp_wqs[i]->ltp_free);
+ LDAP_FREE(pool->ltp_wqs);
+ LDAP_FREE(pool);
+ return(-1);
+ }
+ pool->ltp_wqs[i] = (struct ldap_int_thread_poolq_s *)(((size_t)ptr + CACHELINE-1) & ~(CACHELINE-1));
+ pool->ltp_wqs[i]->ltp_free = ptr;
+ }
+
+ pool->ltp_numqs = numqs;
+ pool->ltp_conf_max_count = max_threads;
+ if ( !max_threads )
+ max_threads = LDAP_MAXTHR;
+
+ rc = ldap_pvt_thread_mutex_init(&pool->ltp_mutex);
+ if (rc != 0) {
+fail:
+ for (i=0; i<numqs; i++)
+ LDAP_FREE(pool->ltp_wqs[i]->ltp_free);
+ LDAP_FREE(pool->ltp_wqs);
+ LDAP_FREE(pool);
+ return(rc);
+ }
+
+ rc = ldap_pvt_thread_cond_init(&pool->ltp_cond);
+ if (rc != 0)
+ goto fail;
+
+ rc = ldap_pvt_thread_cond_init(&pool->ltp_pcond);
+ if (rc != 0)
+ goto fail;
+
+ rem_thr = max_threads % numqs;
+ rem_pend = max_pending % numqs;
+ for ( i=0; i<numqs; i++ ) {
+ pq = pool->ltp_wqs[i];
+ pq->ltp_pool = pool;
+ rc = ldap_pvt_thread_mutex_init(&pq->ltp_mutex);
+ if (rc != 0)
+ return(rc);
+ rc = ldap_pvt_thread_cond_init(&pq->ltp_cond);
+ if (rc != 0)
+ return(rc);
+ LDAP_STAILQ_INIT(&pq->ltp_pending_list);
+ pq->ltp_work_list = &pq->ltp_pending_list;
+ LDAP_SLIST_INIT(&pq->ltp_free_list);
+
+ pq->ltp_max_count = max_threads / numqs;
+ if ( rem_thr ) {
+ pq->ltp_max_count++;
+ rem_thr--;
+ }
+ pq->ltp_max_pending = max_pending / numqs;
+ if ( rem_pend ) {
+ pq->ltp_max_pending++;
+ rem_pend--;
+ }
+ }
+
+ ldap_int_has_thread_pool = 1;
+
+ pool->ltp_max_count = max_threads;
+ pool->ltp_max_pending = max_pending;
+
+ ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
+ LDAP_STAILQ_INSERT_TAIL(&ldap_int_thread_pool_list, pool, ltp_next);
+ ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
+
+ /* Start no threads just yet. That can break if the process forks
+ * later, as slapd does in order to daemonize. On at least POSIX,
+ * only the forking thread would survive in the child. Yet fork()
+ * can't unlock/clean up other threads' locks and data structures,
+ * unless pthread_atfork() handlers have been set up to do so.
+ */
+
+ *tpool = pool;
+ return(0);
+}
+
+int
+ldap_pvt_thread_pool_init (
+ ldap_pvt_thread_pool_t *tpool,
+ int max_threads,
+ int max_pending )
+{
+ return ldap_pvt_thread_pool_init_q( tpool, max_threads, max_pending, 1 );
+}
+
+/* Submit a task to be performed by the thread pool */
+int
+ldap_pvt_thread_pool_submit (
+ ldap_pvt_thread_pool_t *tpool,
+ ldap_pvt_thread_start_t *start_routine, void *arg )
+{
+ return ldap_pvt_thread_pool_submit2( tpool, start_routine, arg, NULL );
+}
+
+/* Submit a task to be performed by the thread pool */
+int
+ldap_pvt_thread_pool_submit2 (
+ ldap_pvt_thread_pool_t *tpool,
+ ldap_pvt_thread_start_t *start_routine, void *arg,
+ void **cookie )
+{
+ struct ldap_int_thread_pool_s *pool;
+ struct ldap_int_thread_poolq_s *pq;
+ ldap_int_thread_task_t *task;
+ ldap_pvt_thread_t thr;
+ int i, j;
+
+ if (tpool == NULL)
+ return(-1);
+
+ pool = *tpool;
+
+ if (pool == NULL)
+ return(-1);
+
+ if ( pool->ltp_numqs > 1 ) {
+ int min = pool->ltp_wqs[0]->ltp_max_pending + pool->ltp_wqs[0]->ltp_max_count;
+ int min_x = 0, cnt;
+ for ( i = 0; i < pool->ltp_numqs; i++ ) {
+ /* take first queue that has nothing active */
+ if ( !pool->ltp_wqs[i]->ltp_active_count ) {
+ min_x = i;
+ break;
+ }
+ cnt = pool->ltp_wqs[i]->ltp_active_count + pool->ltp_wqs[i]->ltp_pending_count;
+ if ( cnt < min ) {
+ min = cnt;
+ min_x = i;
+ }
+ }
+ i = min_x;
+ } else
+ i = 0;
+
+ j = i;
+ while(1) {
+ ldap_pvt_thread_mutex_lock(&pool->ltp_wqs[i]->ltp_mutex);
+ if (pool->ltp_wqs[i]->ltp_pending_count < pool->ltp_wqs[i]->ltp_max_pending) {
+ break;
+ }
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_wqs[i]->ltp_mutex);
+ i++;
+ i %= pool->ltp_numqs;
+ if ( i == j )
+ return -1;
+ }
+
+ pq = pool->ltp_wqs[i];
+ task = LDAP_SLIST_FIRST(&pq->ltp_free_list);
+ if (task) {
+ LDAP_SLIST_REMOVE_HEAD(&pq->ltp_free_list, ltt_next.l);
+ } else {
+ task = (ldap_int_thread_task_t *) LDAP_MALLOC(sizeof(*task));
+ if (task == NULL)
+ goto failed;
+ }
+
+ task->ltt_start_routine = start_routine;
+ task->ltt_arg = arg;
+ task->ltt_queue = pq;
+ if ( cookie )
+ *cookie = task;
+
+ pq->ltp_pending_count++;
+ LDAP_STAILQ_INSERT_TAIL(&pq->ltp_pending_list, task, ltt_next.q);
+
+ if (pool->ltp_pause)
+ goto done;
+
+ /* should we open (create) a thread? */
+ if (pq->ltp_open_count < pq->ltp_active_count+pq->ltp_pending_count &&
+ pq->ltp_open_count < pq->ltp_max_count)
+ {
+ pq->ltp_starting++;
+ pq->ltp_open_count++;
+
+ if (0 != ldap_pvt_thread_create(
+ &thr, 1, ldap_int_thread_pool_wrapper, pq))
+ {
+ /* couldn't create thread. back out of
+ * ltp_open_count and check for even worse things.
+ */
+ pq->ltp_starting--;
+ pq->ltp_open_count--;
+
+ if (pq->ltp_open_count == 0) {
+ /* no open threads at all?!?
+ */
+ ldap_int_thread_task_t *ptr;
+
+ /* let pool_close know there are no more threads */
+ ldap_pvt_thread_cond_signal(&pq->ltp_cond);
+
+ LDAP_STAILQ_FOREACH(ptr, &pq->ltp_pending_list, ltt_next.q)
+ if (ptr == task) break;
+ if (ptr == task) {
+ /* no open threads, task not handled, so
+ * back out of ltp_pending_count, free the task,
+ * report the error.
+ */
+ pq->ltp_pending_count--;
+ LDAP_STAILQ_REMOVE(&pq->ltp_pending_list, task,
+ ldap_int_thread_task_s, ltt_next.q);
+ LDAP_SLIST_INSERT_HEAD(&pq->ltp_free_list, task,
+ ltt_next.l);
+ goto failed;
+ }
+ }
+ /* there is another open thread, so this
+ * task will be handled eventually.
+ */
+ }
+ }
+ ldap_pvt_thread_cond_signal(&pq->ltp_cond);
+
+ done:
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+ return(0);
+
+ failed:
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+ return(-1);
+}
+
+static void *
+no_task( void *ctx, void *arg )
+{
+ return NULL;
+}
+
+/* Cancel a pending task that was previously submitted.
+ * Return 1 if the task was successfully cancelled, 0 if
+ * not found, -1 for invalid parameters
+ */
+int
+ldap_pvt_thread_pool_retract (
+ void *cookie )
+{
+ ldap_int_thread_task_t *task, *ttmp;
+ struct ldap_int_thread_poolq_s *pq;
+
+ if (cookie == NULL)
+ return(-1);
+
+ ttmp = cookie;
+ pq = ttmp->ltt_queue;
+ if (pq == NULL)
+ return(-1);
+
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ LDAP_STAILQ_FOREACH(task, &pq->ltp_pending_list, ltt_next.q)
+ if (task == ttmp) {
+ /* Could LDAP_STAILQ_REMOVE the task, but that
+ * walks ltp_pending_list again to find it.
+ */
+ task->ltt_start_routine = no_task;
+ task->ltt_arg = NULL;
+ break;
+ }
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+ return task != NULL;
+}
+
+/* Walk the pool and allow tasks to be retracted, only to be called while the
+ * pool is paused */
+int
+ldap_pvt_thread_pool_walk(
+ ldap_pvt_thread_pool_t *tpool,
+ ldap_pvt_thread_start_t *start,
+ ldap_pvt_thread_walk_t *cb, void *arg )
+{
+ struct ldap_int_thread_pool_s *pool;
+ struct ldap_int_thread_poolq_s *pq;
+ ldap_int_thread_task_t *task;
+ int i;
+
+ if (tpool == NULL)
+ return(-1);
+
+ pool = *tpool;
+
+ if (pool == NULL)
+ return(-1);
+
+ ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+ assert(pool->ltp_pause == PAUSED);
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+
+ for (i=0; i<pool->ltp_numqs; i++) {
+ pq = pool->ltp_wqs[i];
+ LDAP_STAILQ_FOREACH(task, &pq->ltp_pending_list, ltt_next.q) {
+ if ( task->ltt_start_routine == start ) {
+ if ( cb( task->ltt_start_routine, task->ltt_arg, arg ) ) {
+ /* retract */
+ task->ltt_start_routine = no_task;
+ task->ltt_arg = NULL;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+/* Set number of work queues in this pool. Should not be
+ * more than the number of CPUs. */
+int
+ldap_pvt_thread_pool_queues(
+ ldap_pvt_thread_pool_t *tpool,
+ int numqs )
+{
+ struct ldap_int_thread_pool_s *pool;
+ struct ldap_int_thread_poolq_s *pq;
+ int i, rc, rem_thr, rem_pend;
+
+ if (numqs < 1 || tpool == NULL)
+ return(-1);
+
+ pool = *tpool;
+
+ if (pool == NULL)
+ return(-1);
+
+ if (numqs < pool->ltp_numqs) {
+ for (i=numqs; i<pool->ltp_numqs; i++)
+ pool->ltp_wqs[i]->ltp_max_count = 0;
+ } else if (numqs > pool->ltp_numqs) {
+ struct ldap_int_thread_poolq_s **wqs;
+ wqs = LDAP_REALLOC(pool->ltp_wqs, numqs * sizeof(struct ldap_int_thread_poolq_s *));
+ if (wqs == NULL)
+ return(-1);
+ pool->ltp_wqs = wqs;
+ for (i=pool->ltp_numqs; i<numqs; i++) {
+ char *ptr = LDAP_CALLOC(1, sizeof(struct ldap_int_thread_poolq_s) + CACHELINE-1);
+ if (ptr == NULL) {
+ for (; i<numqs; i++)
+ pool->ltp_wqs[i] = NULL;
+ return(-1);
+ }
+ pq = (struct ldap_int_thread_poolq_s *)(((size_t)ptr + CACHELINE-1) & ~(CACHELINE-1));
+ pq->ltp_free = ptr;
+ pool->ltp_wqs[i] = pq;
+ pq->ltp_pool = pool;
+ rc = ldap_pvt_thread_mutex_init(&pq->ltp_mutex);
+ if (rc != 0)
+ return(rc);
+ rc = ldap_pvt_thread_cond_init(&pq->ltp_cond);
+ if (rc != 0)
+ return(rc);
+ LDAP_STAILQ_INIT(&pq->ltp_pending_list);
+ pq->ltp_work_list = &pq->ltp_pending_list;
+ LDAP_SLIST_INIT(&pq->ltp_free_list);
+ }
+ }
+ rem_thr = pool->ltp_max_count % numqs;
+ rem_pend = pool->ltp_max_pending % numqs;
+ for ( i=0; i<numqs; i++ ) {
+ pq = pool->ltp_wqs[i];
+ pq->ltp_max_count = pool->ltp_max_count / numqs;
+ if ( rem_thr ) {
+ pq->ltp_max_count++;
+ rem_thr--;
+ }
+ pq->ltp_max_pending = pool->ltp_max_pending / numqs;
+ if ( rem_pend ) {
+ pq->ltp_max_pending++;
+ rem_pend--;
+ }
+ }
+ pool->ltp_numqs = numqs;
+ return 0;
+}
+
+/* Set max #threads. value <= 0 means max supported #threads (LDAP_MAXTHR) */
+int
+ldap_pvt_thread_pool_maxthreads(
+ ldap_pvt_thread_pool_t *tpool,
+ int max_threads )
+{
+ struct ldap_int_thread_pool_s *pool;
+ struct ldap_int_thread_poolq_s *pq;
+ int remthr, i;
+
+ if (! (0 <= max_threads && max_threads <= LDAP_MAXTHR))
+ max_threads = 0;
+
+ if (tpool == NULL)
+ return(-1);
+
+ pool = *tpool;
+
+ if (pool == NULL)
+ return(-1);
+
+ pool->ltp_conf_max_count = max_threads;
+ if ( !max_threads )
+ max_threads = LDAP_MAXTHR;
+ pool->ltp_max_count = max_threads;
+
+ remthr = max_threads % pool->ltp_numqs;
+ max_threads /= pool->ltp_numqs;
+
+ for (i=0; i<pool->ltp_numqs; i++) {
+ pq = pool->ltp_wqs[i];
+ pq->ltp_max_count = max_threads;
+ if (remthr) {
+ pq->ltp_max_count++;
+ remthr--;
+ }
+ }
+ return(0);
+}
+
+/* Inspect the pool */
+int
+ldap_pvt_thread_pool_query(
+ ldap_pvt_thread_pool_t *tpool,
+ ldap_pvt_thread_pool_param_t param,
+ void *value )
+{
+ struct ldap_int_thread_pool_s *pool;
+ int count = -1;
+
+ if ( tpool == NULL || value == NULL ) {
+ return -1;
+ }
+
+ pool = *tpool;
+
+ if ( pool == NULL ) {
+ return 0;
+ }
+
+ switch ( param ) {
+ case LDAP_PVT_THREAD_POOL_PARAM_MAX:
+ count = pool->ltp_conf_max_count;
+ break;
+
+ case LDAP_PVT_THREAD_POOL_PARAM_MAX_PENDING:
+ count = pool->ltp_max_pending;
+ if (count < 0)
+ count = -count;
+ if (count == MAX_PENDING)
+ count = 0;
+ break;
+
+ case LDAP_PVT_THREAD_POOL_PARAM_PAUSING:
+ ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+ count = (pool->ltp_pause != 0);
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ break;
+
+ case LDAP_PVT_THREAD_POOL_PARAM_OPEN:
+ case LDAP_PVT_THREAD_POOL_PARAM_STARTING:
+ case LDAP_PVT_THREAD_POOL_PARAM_ACTIVE:
+ case LDAP_PVT_THREAD_POOL_PARAM_PENDING:
+ case LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD:
+ {
+ int i;
+ count = 0;
+ for (i=0; i<pool->ltp_numqs; i++) {
+ struct ldap_int_thread_poolq_s *pq = pool->ltp_wqs[i];
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ switch(param) {
+ case LDAP_PVT_THREAD_POOL_PARAM_OPEN:
+ count += pq->ltp_open_count;
+ break;
+ case LDAP_PVT_THREAD_POOL_PARAM_STARTING:
+ count += pq->ltp_starting;
+ break;
+ case LDAP_PVT_THREAD_POOL_PARAM_ACTIVE:
+ count += pq->ltp_active_count;
+ break;
+ case LDAP_PVT_THREAD_POOL_PARAM_PENDING:
+ count += pq->ltp_pending_count;
+ break;
+ case LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD:
+ count += pq->ltp_pending_count + pq->ltp_active_count;
+ break;
+ default:
+ break;
+ }
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+ }
+ if (count < 0)
+ count = -count;
+ }
+ break;
+
+ case LDAP_PVT_THREAD_POOL_PARAM_ACTIVE_MAX:
+ break;
+
+ case LDAP_PVT_THREAD_POOL_PARAM_PENDING_MAX:
+ break;
+
+ case LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD_MAX:
+ break;
+
+ case LDAP_PVT_THREAD_POOL_PARAM_STATE:
+ if (pool->ltp_pause)
+ *((char **)value) = "pausing";
+ else if (!pool->ltp_finishing)
+ *((char **)value) = "running";
+ else {
+ int i;
+ for (i=0; i<pool->ltp_numqs; i++)
+ if (pool->ltp_wqs[i]->ltp_pending_count) break;
+ if (i<pool->ltp_numqs)
+ *((char **)value) = "finishing";
+ else
+ *((char **)value) = "stopping";
+ }
+ break;
+
+ case LDAP_PVT_THREAD_POOL_PARAM_UNKNOWN:
+ break;
+ }
+
+ if ( count > -1 ) {
+ *((int *)value) = count;
+ }
+
+ return ( count == -1 ? -1 : 0 );
+}
+
+/*
+ * true if pool is pausing; does not lock any mutex to check.
+ * 0 if not pause, 1 if pause, -1 if error or no pool.
+ */
+int
+ldap_pvt_thread_pool_pausing( ldap_pvt_thread_pool_t *tpool )
+{
+ int rc = -1;
+ struct ldap_int_thread_pool_s *pool;
+
+ if ( tpool != NULL && (pool = *tpool) != NULL ) {
+ rc = (pool->ltp_pause != 0);
+ }
+
+ return rc;
+}
+
+/*
+ * wrapper for ldap_pvt_thread_pool_query(), left around
+ * for backwards compatibility
+ */
+int
+ldap_pvt_thread_pool_backload ( ldap_pvt_thread_pool_t *tpool )
+{
+ int rc, count;
+
+ rc = ldap_pvt_thread_pool_query( tpool,
+ LDAP_PVT_THREAD_POOL_PARAM_BACKLOAD, (void *)&count );
+
+ if ( rc == 0 ) {
+ return count;
+ }
+
+ return rc;
+}
+
+
+/*
+ * wrapper for ldap_pvt_thread_pool_close+free(), left around
+ * for backwards compatibility
+ */
+int
+ldap_pvt_thread_pool_destroy ( ldap_pvt_thread_pool_t *tpool, int run_pending )
+{
+ int rc;
+
+ if ( (rc = ldap_pvt_thread_pool_close( tpool, run_pending )) ) {
+ return rc;
+ }
+
+ return ldap_pvt_thread_pool_free( tpool );
+}
+
+/* Shut down the pool making its threads finish */
+int
+ldap_pvt_thread_pool_close ( ldap_pvt_thread_pool_t *tpool, int run_pending )
+{
+ struct ldap_int_thread_pool_s *pool, *pptr;
+ struct ldap_int_thread_poolq_s *pq;
+ ldap_int_thread_task_t *task;
+ int i;
+
+ if (tpool == NULL)
+ return(-1);
+
+ pool = *tpool;
+
+ if (pool == NULL) return(-1);
+
+ ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
+ LDAP_STAILQ_FOREACH(pptr, &ldap_int_thread_pool_list, ltp_next)
+ if (pptr == pool) break;
+ ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
+
+ if (pool != pptr) return(-1);
+
+ ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+
+ pool->ltp_finishing = 1;
+ if (pool->ltp_max_pending > 0)
+ pool->ltp_max_pending = -pool->ltp_max_pending;
+
+ ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+
+ for (i=0; i<pool->ltp_numqs; i++) {
+ pq = pool->ltp_wqs[i];
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ if (pq->ltp_max_pending > 0)
+ pq->ltp_max_pending = -pq->ltp_max_pending;
+ if (!run_pending) {
+ while ((task = LDAP_STAILQ_FIRST(&pq->ltp_pending_list)) != NULL) {
+ LDAP_STAILQ_REMOVE_HEAD(&pq->ltp_pending_list, ltt_next.q);
+ LDAP_FREE(task);
+ }
+ pq->ltp_pending_count = 0;
+ }
+
+ while (pq->ltp_open_count) {
+ ldap_pvt_thread_cond_broadcast(&pq->ltp_cond);
+ ldap_pvt_thread_cond_wait(&pq->ltp_cond, &pq->ltp_mutex);
+ }
+
+ while ((task = LDAP_SLIST_FIRST(&pq->ltp_free_list)) != NULL)
+ {
+ LDAP_SLIST_REMOVE_HEAD(&pq->ltp_free_list, ltt_next.l);
+ LDAP_FREE(task);
+ }
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+ }
+
+ return(0);
+}
+
+/* Destroy the pool, everything must have already shut down */
+int
+ldap_pvt_thread_pool_free ( ldap_pvt_thread_pool_t *tpool )
+{
+ struct ldap_int_thread_pool_s *pool, *pptr;
+ struct ldap_int_thread_poolq_s *pq;
+ int i;
+
+ if (tpool == NULL)
+ return(-1);
+
+ pool = *tpool;
+
+ if (pool == NULL) return(-1);
+
+ ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
+ LDAP_STAILQ_FOREACH(pptr, &ldap_int_thread_pool_list, ltp_next)
+ if (pptr == pool) break;
+ if (pptr == pool)
+ LDAP_STAILQ_REMOVE(&ldap_int_thread_pool_list, pool,
+ ldap_int_thread_pool_s, ltp_next);
+ ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
+
+ if (pool != pptr) return(-1);
+
+ ldap_pvt_thread_cond_destroy(&pool->ltp_pcond);
+ ldap_pvt_thread_cond_destroy(&pool->ltp_cond);
+ ldap_pvt_thread_mutex_destroy(&pool->ltp_mutex);
+ for (i=0; i<pool->ltp_numqs; i++) {
+ pq = pool->ltp_wqs[i];
+
+ assert( !pq->ltp_open_count );
+ assert( LDAP_SLIST_EMPTY(&pq->ltp_free_list) );
+ ldap_pvt_thread_cond_destroy(&pq->ltp_cond);
+ ldap_pvt_thread_mutex_destroy(&pq->ltp_mutex);
+ if (pq->ltp_free) {
+ LDAP_FREE(pq->ltp_free);
+ }
+ }
+ LDAP_FREE(pool->ltp_wqs);
+ LDAP_FREE(pool);
+ *tpool = NULL;
+ ldap_int_has_thread_pool = 0;
+ return(0);
+}
+
+/* Thread loop. Accept and handle submitted tasks. */
+static void *
+ldap_int_thread_pool_wrapper (
+ void *xpool )
+{
+ struct ldap_int_thread_poolq_s *pq = xpool;
+ struct ldap_int_thread_pool_s *pool = pq->ltp_pool;
+ ldap_int_thread_task_t *task;
+ ldap_int_tpool_plist_t *work_list;
+ ldap_int_thread_userctx_t ctx, *kctx;
+ unsigned i, keyslot, hash;
+ int pool_lock = 0, freeme = 0;
+
+ assert(pool != NULL);
+
+ for ( i=0; i<MAXKEYS; i++ ) {
+ ctx.ltu_key[i].ltk_key = NULL;
+ }
+
+ ctx.ltu_pq = pq;
+ ctx.ltu_id = ldap_pvt_thread_self();
+ TID_HASH(ctx.ltu_id, hash);
+
+ ldap_pvt_thread_key_setdata( ldap_tpool_key, &ctx );
+
+ if (pool->ltp_pause) {
+ ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+ /* thread_keys[] is read-only when paused */
+ while (pool->ltp_pause)
+ ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ }
+
+ /* find a key slot to give this thread ID and store a
+ * pointer to our keys there; start at the thread ID
+ * itself (mod LDAP_MAXTHR) and look for an empty slot.
+ */
+ ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
+ for (keyslot = hash & (LDAP_MAXTHR-1);
+ (kctx = thread_keys[keyslot].ctx) && kctx != DELETED_THREAD_CTX;
+ keyslot = (keyslot+1) & (LDAP_MAXTHR-1));
+ thread_keys[keyslot].ctx = &ctx;
+ ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
+
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ pq->ltp_starting--;
+ pq->ltp_active_count++;
+
+ for (;;) {
+ work_list = pq->ltp_work_list; /* help the compiler a bit */
+ task = LDAP_STAILQ_FIRST(work_list);
+ if (task == NULL) { /* paused or no pending tasks */
+ if (--(pq->ltp_active_count) < 1) {
+ if (pool->ltp_pause) {
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+ ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+ pool_lock = 1;
+ if (--(pool->ltp_active_queues) < 1) {
+ /* Notify pool_pause it is the sole active thread. */
+ ldap_pvt_thread_cond_signal(&pool->ltp_pcond);
+ }
+ }
+ }
+
+ do {
+ if (pool->ltp_finishing || pq->ltp_open_count > pq->ltp_max_count) {
+ /* Not paused, and either finishing or too many
+ * threads running (can happen if ltp_max_count
+ * was reduced). Let this thread die.
+ */
+ goto done;
+ }
+
+ /* We could check an idle timer here, and let the
+ * thread die if it has been inactive for a while.
+ * Only die if there are other open threads (i.e.,
+ * always have at least one thread open).
+ * The check should be like this:
+ * if (pool->ltp_open_count>1 && pool->ltp_starting==0)
+ * check timer, wait if ltp_pause, leave thread;
+ *
+ * Just use pthread_cond_timedwait() if we want to
+ * check idle time.
+ */
+ if (pool_lock) {
+ ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
+ if (!pool->ltp_pause) {
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ pool_lock = 0;
+ }
+ } else
+ ldap_pvt_thread_cond_wait(&pq->ltp_cond, &pq->ltp_mutex);
+
+ work_list = pq->ltp_work_list;
+ task = LDAP_STAILQ_FIRST(work_list);
+ } while (task == NULL);
+
+ if (pool_lock) {
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ pool_lock = 0;
+ }
+ pq->ltp_active_count++;
+ }
+
+ LDAP_STAILQ_REMOVE_HEAD(work_list, ltt_next.q);
+ pq->ltp_pending_count--;
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+
+ task->ltt_start_routine(&ctx, task->ltt_arg);
+
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ LDAP_SLIST_INSERT_HEAD(&pq->ltp_free_list, task, ltt_next.l);
+ }
+ done:
+
+ ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
+
+ /* The pool_mutex lock protects ctx->ltu_key from pool_purgekey()
+ * during this call, since it prevents new pauses. */
+ ldap_pvt_thread_pool_context_reset(&ctx);
+
+ thread_keys[keyslot].ctx = DELETED_THREAD_CTX;
+ ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
+
+ pq->ltp_open_count--;
+ if (pq->ltp_open_count == 0) {
+ if (pool->ltp_finishing)
+ /* let pool_destroy know we're all done */
+ ldap_pvt_thread_cond_signal(&pq->ltp_cond);
+ else
+ freeme = 1;
+ }
+
+ if (pool_lock)
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ else
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+
+ if (freeme) {
+ ldap_pvt_thread_cond_destroy(&pq->ltp_cond);
+ ldap_pvt_thread_mutex_destroy(&pq->ltp_mutex);
+ LDAP_FREE(pq->ltp_free);
+ pq->ltp_free = NULL;
+ }
+ ldap_pvt_thread_exit(NULL);
+ return(NULL);
+}
+
+/* Arguments > ltp_pause to handle_pause(,PAUSE_ARG()). arg=PAUSE_ARG
+ * ensures (arg-ltp_pause) sets GO_* at need and keeps DO_PAUSE/GO_*.
+ */
+#define GO_IDLE 8
+#define GO_UNIDLE 16
+#define CHECK_PAUSE 32 /* if ltp_pause: GO_IDLE; wait; GO_UNIDLE */
+#define DO_PAUSE 64 /* CHECK_PAUSE; pause the pool */
+#define PAUSE_ARG(a) \
+ ((a) | ((a) & (GO_IDLE|GO_UNIDLE) ? GO_IDLE-1 : CHECK_PAUSE))
+
+static int
+handle_pause( ldap_pvt_thread_pool_t *tpool, int pause_type )
+{
+ struct ldap_int_thread_pool_s *pool;
+ struct ldap_int_thread_poolq_s *pq;
+ int ret = 0, pause, max_ltp_pause;
+
+ if (tpool == NULL)
+ return(-1);
+
+ pool = *tpool;
+
+ if (pool == NULL)
+ return(0);
+
+ if (pause_type == CHECK_PAUSE && !pool->ltp_pause)
+ return(0);
+
+ {
+ ldap_int_thread_userctx_t *ctx = ldap_pvt_thread_pool_context();
+ pq = ctx->ltu_pq;
+ if ( !pq )
+ return(-1);
+ }
+
+ /* Let pool_unidle() ignore requests for new pauses */
+ max_ltp_pause = pause_type==PAUSE_ARG(GO_UNIDLE) ? WANT_PAUSE : NOT_PAUSED;
+
+ ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+
+ pause = pool->ltp_pause; /* NOT_PAUSED, WANT_PAUSE or PAUSED */
+
+ /* If ltp_pause and not GO_IDLE|GO_UNIDLE: Set GO_IDLE,GO_UNIDLE */
+ pause_type -= pause;
+
+ if (pause_type & GO_IDLE) {
+ int do_pool = 0;
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ pq->ltp_pending_count++;
+ pq->ltp_active_count--;
+ if (pause && pq->ltp_active_count < 1) {
+ do_pool = 1;
+ }
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+ if (do_pool) {
+ pool->ltp_active_queues--;
+ if (pool->ltp_active_queues < 1)
+ /* Tell the task waiting to DO_PAUSE it can proceed */
+ ldap_pvt_thread_cond_signal(&pool->ltp_pcond);
+ }
+ }
+
+ if (pause_type & GO_UNIDLE) {
+ /* Wait out pause if any, then cancel GO_IDLE */
+ if (pause > max_ltp_pause) {
+ ret = 1;
+ do {
+ ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
+ } while (pool->ltp_pause > max_ltp_pause);
+ }
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ pq->ltp_pending_count--;
+ pq->ltp_active_count++;
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+ }
+
+ if (pause_type & DO_PAUSE) {
+ int i, j;
+ /* Tell everyone else to pause or finish, then await that */
+ ret = 0;
+ assert(!pool->ltp_pause);
+ pool->ltp_pause = WANT_PAUSE;
+ pool->ltp_active_queues = 0;
+
+ for (i=0; i<pool->ltp_numqs; i++)
+ if (pool->ltp_wqs[i] == pq) break;
+
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ /* temporarily remove ourself from active count */
+ pq->ltp_active_count--;
+
+ j=i;
+ do {
+ pq = pool->ltp_wqs[j];
+ if (j != i)
+ ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+
+ /* Hide pending tasks from ldap_pvt_thread_pool_wrapper() */
+ pq->ltp_work_list = &empty_pending_list;
+
+ if (pq->ltp_active_count > 0)
+ pool->ltp_active_queues++;
+
+ ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
+ if (pool->ltp_numqs > 1) {
+ j++;
+ j %= pool->ltp_numqs;
+ }
+ } while (j != i);
+
+ /* Wait for this task to become the sole active task */
+ while (pool->ltp_active_queues > 0)
+ ldap_pvt_thread_cond_wait(&pool->ltp_pcond, &pool->ltp_mutex);
+
+ /* restore us to active count */
+ pool->ltp_wqs[i]->ltp_active_count++;
+
+ assert(pool->ltp_pause == WANT_PAUSE);
+ pool->ltp_pause = PAUSED;
+ }
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+
+ return(ret);
+}
+
+/* Consider this task idle: It will not block pool_pause() in other tasks. */
+void
+ldap_pvt_thread_pool_idle( ldap_pvt_thread_pool_t *tpool )
+{
+ handle_pause(tpool, PAUSE_ARG(GO_IDLE));
+}
+
+/* Cancel pool_idle(). If the pool is paused, wait it out first. */
+void
+ldap_pvt_thread_pool_unidle( ldap_pvt_thread_pool_t *tpool )
+{
+ handle_pause(tpool, PAUSE_ARG(GO_UNIDLE));
+}
+
+/*
+ * If a pause was requested, wait for it. If several threads
+ * are waiting to pause, let through one or more pauses.
+ * The calling task must be active, not idle.
+ * Return 1 if we waited, 0 if not, -1 at parameter error.
+ */
+int
+ldap_pvt_thread_pool_pausecheck( ldap_pvt_thread_pool_t *tpool )
+{
+ return handle_pause(tpool, PAUSE_ARG(CHECK_PAUSE));
+}
+
+/*
+ * Wait for a pause, from a non-pooled thread.
+ */
+int
+ldap_pvt_thread_pool_pausecheck_native( ldap_pvt_thread_pool_t *tpool )
+{
+ struct ldap_int_thread_pool_s *pool;
+
+ if (tpool == NULL)
+ return(-1);
+
+ pool = *tpool;
+
+ if (pool == NULL)
+ return(0);
+
+ if (!pool->ltp_pause)
+ return(0);
+
+ ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+ while (pool->ltp_pause)
+ ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ return 1;
+}
+
+/*
+ * Pause the pool. The calling task must be active, not idle.
+ * Return when all other tasks are paused or idle.
+ */
+int
+ldap_pvt_thread_pool_pause( ldap_pvt_thread_pool_t *tpool )
+{
+ return handle_pause(tpool, PAUSE_ARG(DO_PAUSE));
+}
+
+/* End a pause */
+int
+ldap_pvt_thread_pool_resume (
+ ldap_pvt_thread_pool_t *tpool )
+{
+ struct ldap_int_thread_pool_s *pool;
+ struct ldap_int_thread_poolq_s *pq;
+ int i;
+
+ if (tpool == NULL)
+ return(-1);
+
+ pool = *tpool;
+
+ if (pool == NULL)
+ return(0);
+
+ ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+ assert(pool->ltp_pause == PAUSED);
+ pool->ltp_pause = 0;
+ for (i=0; i<pool->ltp_numqs; i++) {
+ pq = pool->ltp_wqs[i];
+ pq->ltp_work_list = &pq->ltp_pending_list;
+ ldap_pvt_thread_cond_broadcast(&pq->ltp_cond);
+ }
+ ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ return(0);
+}
+
+/*
+ * Get the key's data and optionally free function in the given context.
+ */
+int ldap_pvt_thread_pool_getkey(
+ void *xctx,
+ void *key,
+ void **data,
+ ldap_pvt_thread_pool_keyfree_t **kfree )
+{
+ ldap_int_thread_userctx_t *ctx = xctx;
+ int i;
+
+ if ( !ctx || !key || !data ) return EINVAL;
+
+ for ( i=0; i<MAXKEYS && ctx->ltu_key[i].ltk_key; i++ ) {
+ if ( ctx->ltu_key[i].ltk_key == key ) {
+ *data = ctx->ltu_key[i].ltk_data;
+ if ( kfree ) *kfree = ctx->ltu_key[i].ltk_free;
+ return 0;
+ }
+ }
+ return ENOENT;
+}
+
+static void
+clear_key_idx( ldap_int_thread_userctx_t *ctx, int i )
+{
+ for ( ; i < MAXKEYS-1 && ctx->ltu_key[i+1].ltk_key; i++ )
+ ctx->ltu_key[i] = ctx->ltu_key[i+1];
+ ctx->ltu_key[i].ltk_key = NULL;
+}
+
+/*
+ * Set or remove data for the key in the given context.
+ * key can be any unique pointer.
+ * kfree() is an optional function to free the data (but not the key):
+ * pool_context_reset() and pool_purgekey() call kfree(key, data),
+ * but pool_setkey() does not. For pool_setkey() it is the caller's
+ * responsibility to free any existing data with the same key.
+ * kfree() must not call functions taking a tpool argument.
+ */
+int ldap_pvt_thread_pool_setkey(
+ void *xctx,
+ void *key,
+ void *data,
+ ldap_pvt_thread_pool_keyfree_t *kfree,
+ void **olddatap,
+ ldap_pvt_thread_pool_keyfree_t **oldkfreep )
+{
+ ldap_int_thread_userctx_t *ctx = xctx;
+ int i, found;
+
+ if ( !ctx || !key ) return EINVAL;
+
+ for ( i=found=0; i<MAXKEYS; i++ ) {
+ if ( ctx->ltu_key[i].ltk_key == key ) {
+ found = 1;
+ break;
+ } else if ( !ctx->ltu_key[i].ltk_key ) {
+ break;
+ }
+ }
+
+ if ( olddatap ) {
+ if ( found ) {
+ *olddatap = ctx->ltu_key[i].ltk_data;
+ } else {
+ *olddatap = NULL;
+ }
+ }
+
+ if ( oldkfreep ) {
+ if ( found ) {
+ *oldkfreep = ctx->ltu_key[i].ltk_free;
+ } else {
+ *oldkfreep = 0;
+ }
+ }
+
+ if ( data || kfree ) {
+ if ( i>=MAXKEYS )
+ return ENOMEM;
+ ctx->ltu_key[i].ltk_key = key;
+ ctx->ltu_key[i].ltk_data = data;
+ ctx->ltu_key[i].ltk_free = kfree;
+ } else if ( found ) {
+ clear_key_idx( ctx, i );
+ }
+
+ return 0;
+}
+
+/* Free all elements with this key, no matter which thread they're in.
+ * May only be called while the pool is paused.
+ */
+void ldap_pvt_thread_pool_purgekey( void *key )
+{
+ int i, j;
+ ldap_int_thread_userctx_t *ctx;
+
+ assert ( key != NULL );
+
+ ldap_pvt_thread_mutex_lock(&ldap_pvt_thread_pool_mutex);
+ for ( i=0; i<LDAP_MAXTHR; i++ ) {
+ ctx = thread_keys[i].ctx;
+ if ( ctx && ctx != DELETED_THREAD_CTX ) {
+ for ( j=0; j<MAXKEYS && ctx->ltu_key[j].ltk_key; j++ ) {
+ if ( ctx->ltu_key[j].ltk_key == key ) {
+ if (ctx->ltu_key[j].ltk_free)
+ ctx->ltu_key[j].ltk_free( ctx->ltu_key[j].ltk_key,
+ ctx->ltu_key[j].ltk_data );
+ clear_key_idx( ctx, j );
+ break;
+ }
+ }
+ }
+ }
+ ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
+}
+
+/*
+ * Find the context of the current thread.
+ * This is necessary if the caller does not have access to the
+ * thread context handle (for example, a slapd plugin calling
+ * slapi_search_internal()). No doubt it is more efficient
+ * for the application to keep track of the thread context
+ * handles itself.
+ */
+void *ldap_pvt_thread_pool_context( )
+{
+ void *ctx = NULL;
+
+ ldap_pvt_thread_key_getdata( ldap_tpool_key, &ctx );
+ return ctx ? ctx : (void *) &ldap_int_main_thrctx;
+}
+
+/*
+ * Free the context's keys.
+ * Must not call functions taking a tpool argument (because this
+ * thread already holds ltp_mutex when called from pool_wrapper()).
+ */
+void ldap_pvt_thread_pool_context_reset( void *vctx )
+{
+ ldap_int_thread_userctx_t *ctx = vctx;
+ int i;
+
+ for ( i=MAXKEYS-1; i>=0; i--) {
+ if ( !ctx->ltu_key[i].ltk_key )
+ continue;
+ if ( ctx->ltu_key[i].ltk_free )
+ ctx->ltu_key[i].ltk_free( ctx->ltu_key[i].ltk_key,
+ ctx->ltu_key[i].ltk_data );
+ ctx->ltu_key[i].ltk_key = NULL;
+ }
+}
+
+ldap_pvt_thread_t ldap_pvt_thread_pool_tid( void *vctx )
+{
+ ldap_int_thread_userctx_t *ctx = vctx;
+
+ return ctx->ltu_id;
+}
+#endif /* LDAP_THREAD_HAVE_TPOOL */
+
+#endif /* LDAP_R_COMPILE */