#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;
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, and protect thread_keys[] during pauses */
+ /* protect members below */
ldap_pvt_thread_mutex_t ltp_mutex;
- /* not paused and something to do for pool_<wrapper/pause/destroy>() */
+ /* 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 ? <p_pending_list : &empty_pending_list,
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 pool, or 0 for default (LDAP_MAXTHR) */
+ /* Max number of threads in this queue */
int ltp_max_count;
/* Max pending + paused + idle tasks, negated when ltp_finishing */
struct ldap_int_thread_pool_s {
LDAP_STAILQ_ENTRY(ldap_int_thread_pool_s) ltp_next;
- struct ldap_int_thread_poolq_s *ltp_wqs;
+ struct ldap_int_thread_poolq_s **ltp_wqs;
/* number of poolqs */
int ltp_numqs;
- /* protect members below, and protect thread_keys[] during pauses */
+ /* protect members below */
ldap_pvt_thread_mutex_t ltp_mutex;
- /* not paused and something to do for pool_<wrapper/pause/destroy>() */
+ /* 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_count <= 1 && ltp_pause */
+ /* ltp_active_queues < 1 && ltp_pause */
ldap_pvt_thread_cond_t ltp_pcond;
/* number of active queues */
*tpool = NULL;
pool = (ldap_pvt_thread_pool_t) LDAP_CALLOC(1,
- sizeof(struct ldap_int_thread_pool_s) +
- numqs * sizeof(struct ldap_int_thread_poolq_s));
+ sizeof(struct ldap_int_thread_pool_s));
if (pool == NULL) return(-1);
- pool->ltp_wqs = (struct ldap_int_thread_poolq_s *)(pool+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 )
rem_thr = max_threads % numqs;
rem_pend = max_pending % numqs;
for ( i=0; i<numqs; i++ ) {
- pq = &pool->ltp_wqs[i];
+ pq = pool->ltp_wqs[i];
pq->ltp_pool = pool;
rc = ldap_pvt_thread_mutex_init(&pq->ltp_mutex);
if (rc != 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) {
+ 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);
+ 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];
+ 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);
return(-1);
i = ldap_int_poolq_hash( pool, arg );
- pq = &pool->ltp_wqs[i];
+ pq = pool->ltp_wqs[i];
ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
LDAP_STAILQ_FOREACH(task, &pq->ltp_pending_list, ltt_next.q)
return task != NULL;
}
+/* 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(
max_threads /= pool->ltp_numqs;
for (i=0; i<pool->ltp_numqs; i++) {
- pq = &pool->ltp_wqs[i];
- ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
+ pq = pool->ltp_wqs[i];
pq->ltp_max_count = max_threads;
if (remthr) {
pq->ltp_max_count++;
remthr--;
}
- ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
}
return(0);
}
int i;
count = 0;
for (i=0; i<pool->ltp_numqs; i++) {
- struct ldap_int_thread_poolq_s *pq = &pool->ltp_wqs[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:
else {
int i;
for (i=0; i<pool->ltp_numqs; i++)
- if (pool->ltp_wqs[i].ltp_pending_count) break;
+ if (pool->ltp_wqs[i]->ltp_pending_count) break;
if (i<pool->ltp_numqs)
*((char **)value) = "finishing";
else
ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
for (i=0; i<pool->ltp_numqs; i++) {
- pq = &pool->ltp_wqs[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;
ldap_int_tpool_plist_t *work_list;
ldap_int_thread_userctx_t ctx, *kctx;
unsigned i, keyslot, hash;
- int global_lock = 0;
+ int pool_lock = 0, freeme = 0;
assert(pool != NULL);
if (pool->ltp_pause) {
ldap_pvt_thread_mutex_unlock(&pq->ltp_mutex);
ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
- global_lock = 1;
+ 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);
* Just use pthread_cond_timedwait() if we want to
* check idle time.
*/
- if (global_lock) {
+ 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);
- global_lock = 0;
+ pool_lock = 0;
}
} else
ldap_pvt_thread_cond_wait(&pq->ltp_cond, &pq->ltp_mutex);
task = LDAP_STAILQ_FIRST(work_list);
} while (task == NULL);
- if (global_lock) {
+ if (pool_lock) {
ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
- global_lock = 0;
+ pool_lock = 0;
}
pq->ltp_active_count++;
}
ldap_pvt_thread_mutex_unlock(&ldap_pvt_thread_pool_mutex);
pq->ltp_open_count--;
- /* let pool_destroy know we're all done */
- if (pq->ltp_open_count == 0)
- ldap_pvt_thread_cond_signal(&pq->ltp_cond);
+ 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 (global_lock)
+ 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);
+ }
ldap_pvt_thread_exit(NULL);
return(NULL);
}
pool->ltp_active_queues = 0;
for (i=0; i<pool->ltp_numqs; i++)
- if (&pool->ltp_wqs[i] == pq) break;
+ if (pool->ltp_wqs[i] == pq) break;
ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
/* temporarily remove ourself from active count */
j=i;
do {
- pq = &pool->ltp_wqs[j];
+ pq = pool->ltp_wqs[j];
if (j != i)
ldap_pvt_thread_mutex_lock(&pq->ltp_mutex);
ldap_pvt_thread_cond_wait(&pool->ltp_pcond, &pool->ltp_mutex);
/* restore us to active count */
- pool->ltp_wqs[i].ltp_active_count++;
+ pool->ltp_wqs[i]->ltp_active_count++;
assert(pool->ltp_pause == WANT_PAUSE);
pool->ltp_pause = PAUSED;
assert(pool->ltp_pause == PAUSED);
pool->ltp_pause = 0;
for (i=0; i<pool->ltp_numqs; i++) {
- pq = &pool->ltp_wqs[i];
+ pq = pool->ltp_wqs[i];
if (pq->ltp_open_count <= 0) /* true when paused, but be paranoid */
pq->ltp_open_count = -pq->ltp_open_count;
pq->ltp_work_list = &pq->ltp_pending_list;
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