/* $OpenLDAP$ */
-/*
- * Copyright 1998-2003 The OpenLDAP Foundation, Redwood City, California, USA
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2006 The OpenLDAP Foundation.
* All rights reserved.
*
- * Redistribution and use in source and binary forms are permitted only
- * as authorized by the OpenLDAP Public License. A copy of this
- * license is available at http://www.OpenLDAP.org/license.html or
- * in file LICENSE in the top-level directory of the distribution.
+ * 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 <ac/errno.h>
#include "ldap-int.h"
-#include "ldap_pvt_thread.h"
+#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
-enum ldap_int_thread_pool_state {
+typedef enum ldap_int_thread_pool_state_e {
LDAP_INT_THREAD_POOL_RUNNING,
LDAP_INT_THREAD_POOL_FINISHING,
- LDAP_INT_THREAD_POOL_STOPPING
-};
+ LDAP_INT_THREAD_POOL_STOPPING,
+ LDAP_INT_THREAD_POOL_PAUSING
+} ldap_int_thread_pool_state_t;
typedef struct ldap_int_thread_key_s {
void *ltk_key;
* We don't expect to use many...
*/
#define MAXKEYS 32
+#define LDAP_MAXTHR 1024 /* must be a power of 2 */
+
+static ldap_pvt_thread_t tid_zero;
+
+static struct {
+ ldap_pvt_thread_t id;
+ ldap_int_thread_key_t *ctx;
+} thread_keys[LDAP_MAXTHR];
+
typedef struct ldap_int_thread_ctx_s {
union {
} ltc_next;
ldap_pvt_thread_start_t *ltc_start_routine;
void *ltc_arg;
- ldap_pvt_thread_t ltc_thread_id;
- ldap_int_thread_key_t *ltc_key;
} ldap_int_thread_ctx_t;
struct ldap_int_thread_pool_s {
LDAP_STAILQ_ENTRY(ldap_int_thread_pool_s) ltp_next;
ldap_pvt_thread_mutex_t ltp_mutex;
ldap_pvt_thread_cond_t ltp_cond;
+ ldap_pvt_thread_cond_t ltp_pcond;
LDAP_STAILQ_HEAD(tcq, ldap_int_thread_ctx_s) ltp_pending_list;
LDAP_SLIST_HEAD(tcl, ldap_int_thread_ctx_s) ltp_free_list;
LDAP_SLIST_HEAD(tclq, ldap_int_thread_ctx_s) ltp_active_list;
- long ltp_state;
+ ldap_int_thread_pool_state_t ltp_state;
long ltp_max_count;
long ltp_max_pending;
long ltp_pending_count;
static void *ldap_int_thread_pool_wrapper( void *pool );
+static ldap_pvt_thread_t ldap_int_main_tid;
+
+static ldap_int_thread_key_t ldap_int_main_thrctx[LDAP_MAXTHR];
+
int
ldap_int_thread_pool_startup ( void )
{
+ ldap_int_main_tid = ldap_pvt_thread_self();
+
return ldap_pvt_thread_mutex_init(&ldap_pvt_thread_pool_mutex);
}
struct ldap_int_thread_pool_s *pool;
while ((pool = LDAP_STAILQ_FIRST(&ldap_int_thread_pool_list)) != NULL) {
- LDAP_STAILQ_REMOVE_HEAD(&ldap_int_thread_pool_list, ltp_next);
- ldap_pvt_thread_pool_destroy( &pool, 0);
+ (ldap_pvt_thread_pool_destroy)(&pool, 0); /* ignore thr_debug macro */
}
ldap_pvt_thread_mutex_destroy(&ldap_pvt_thread_pool_mutex);
return(0);
if (rc != 0)
return(rc);
rc = ldap_pvt_thread_cond_init(&pool->ltp_cond);
+ if (rc != 0)
+ return(rc);
+ rc = ldap_pvt_thread_cond_init(&pool->ltp_pcond);
if (rc != 0)
return(rc);
pool->ltp_state = LDAP_INT_THREAD_POOL_RUNNING;
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);
+ ldap_pvt_thread_cond_destroy(&pool->ltp_pcond);
ldap_pvt_thread_cond_destroy(&pool->ltp_cond);
ldap_pvt_thread_mutex_destroy(&pool->ltp_mutex);
LDAP_FREE(pool);
return(0);
}
+#define TID_HASH(tid, hash) do { unsigned i; \
+ unsigned char *ptr = (unsigned char *)&(tid); \
+ for (i=0, hash=0; i<sizeof(tid); i++) hash += ptr[i]; } while(0)
+
int
ldap_pvt_thread_pool_submit (
ldap_pvt_thread_pool_t *tpool,
return(-1);
ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
- if (pool->ltp_state != LDAP_INT_THREAD_POOL_RUNNING
+ if ((pool->ltp_state != LDAP_INT_THREAD_POOL_RUNNING &&
+ pool->ltp_state != LDAP_INT_THREAD_POOL_PAUSING)
|| (pool->ltp_max_pending > 0
&& pool->ltp_pending_count >= pool->ltp_max_pending))
{
if (ctx) {
LDAP_SLIST_REMOVE_HEAD(&pool->ltp_free_list, ltc_next.l);
} else {
- int i;
ctx = (ldap_int_thread_ctx_t *) LDAP_MALLOC(
sizeof(ldap_int_thread_ctx_t));
if (ctx == NULL) {
pool->ltp_pending_count++;
LDAP_STAILQ_INSERT_TAIL(&pool->ltp_pending_list, ctx, ltc_next.q);
+ if (pool->ltp_state == LDAP_INT_THREAD_POOL_PAUSING) {
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ return(0);
+ }
ldap_pvt_thread_cond_signal(&pool->ltp_cond);
- if ((pool->ltp_open_count <= 0
-#if 0
- || pool->ltp_pending_count > 1
-#endif
- || pool->ltp_open_count == pool->ltp_active_count)
- && (pool->ltp_max_count <= 0
- || pool->ltp_open_count < pool->ltp_max_count))
+ if (pool->ltp_open_count < pool->ltp_active_count + pool->ltp_pending_count
+ && (pool->ltp_open_count < pool->ltp_max_count ||
+ pool->ltp_max_count <= 0 ))
{
pool->ltp_open_count++;
pool->ltp_starting++;
ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
if (need_thread) {
- int rc = ldap_pvt_thread_create( &thr, 1,
- ldap_int_thread_pool_wrapper, pool );
+ int rc;
+
ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+
+ rc = ldap_pvt_thread_create( &thr, 1,
+ ldap_int_thread_pool_wrapper, pool );
if (rc == 0) {
+ int hash;
pool->ltp_starting--;
+
+ /* assign this thread ID to a key slot; start
+ * at the thread ID itself (mod LDAP_MAXTHR) and
+ * look for an empty slot.
+ */
+ TID_HASH(thr, hash);
+ for (rc = hash & (LDAP_MAXTHR-1);
+ !ldap_pvt_thread_equal(thread_keys[rc].id, tid_zero);
+ rc = (rc+1) & (LDAP_MAXTHR-1));
+ thread_keys[rc].id = thr;
} else {
/* couldn't create thread. back out of
* ltp_open_count and check for even worse things.
ldap_pvt_thread_pool_destroy ( ldap_pvt_thread_pool_t *tpool, int run_pending )
{
struct ldap_int_thread_pool_s *pool, *pptr;
- long waiting;
ldap_int_thread_ctx_t *ctx;
if (tpool == NULL)
? LDAP_INT_THREAD_POOL_FINISHING
: LDAP_INT_THREAD_POOL_STOPPING;
- ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);
+ if ( pool->ltp_open_count ) {
+ ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);
+ ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
+ }
ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
- do {
- ldap_pvt_thread_yield();
- ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
- waiting = pool->ltp_open_count;
- ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
- } while (waiting > 0);
-
while ((ctx = LDAP_STAILQ_FIRST(&pool->ltp_pending_list)) != NULL)
{
LDAP_STAILQ_REMOVE_HEAD(&pool->ltp_pending_list, ltc_next.q);
LDAP_FREE(ctx);
}
+ ldap_pvt_thread_cond_destroy(&pool->ltp_pcond);
ldap_pvt_thread_cond_destroy(&pool->ltp_cond);
ldap_pvt_thread_mutex_destroy(&pool->ltp_mutex);
LDAP_FREE(pool);
struct ldap_int_thread_pool_s *pool = xpool;
ldap_int_thread_ctx_t *ctx;
ldap_int_thread_key_t ltc_key[MAXKEYS];
- int i;
+ ldap_pvt_thread_t tid;
+ int i, keyslot, hash;
if (pool == NULL)
return NULL;
ltc_key[i].ltk_key = NULL;
}
+ tid = ldap_pvt_thread_self();
+
ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+ /* store pointer to our keys */
+ TID_HASH(tid, hash);
+ for (i = hash & (LDAP_MAXTHR-1);
+ !ldap_pvt_thread_equal(thread_keys[i].id, tid);
+ i = (i+1) & (LDAP_MAXTHR-1));
+ thread_keys[i].ctx = ltc_key;
+ keyslot = i;
+
while (pool->ltp_state != LDAP_INT_THREAD_POOL_STOPPING) {
ctx = LDAP_STAILQ_FIRST(&pool->ltp_pending_list);
if (ctx) {
* should be like this:
* if (pool->ltp_open_count > 1 && pool->ltp_starting == 0)
* check timer, leave thread (break;)
+ *
+ * Just use pthread_cond_timedwait if we want to
+ * check idle time.
*/
- if (pool->ltp_state == LDAP_INT_THREAD_POOL_RUNNING)
+ if (pool->ltp_state == LDAP_INT_THREAD_POOL_RUNNING
+ || pool->ltp_state == LDAP_INT_THREAD_POOL_PAUSING)
+ {
ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
+ }
continue;
}
pool->ltp_pending_count--;
- ctx->ltc_key = ltc_key;
- ctx->ltc_thread_id = ldap_pvt_thread_self();
-
LDAP_SLIST_INSERT_HEAD(&pool->ltp_active_list, ctx, ltc_next.al);
pool->ltp_active_count++;
ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
- ctx->ltc_start_routine(ctx, ctx->ltc_arg);
- ctx->ltc_key = NULL;
+ ctx->ltc_start_routine(ltc_key, ctx->ltc_arg);
ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
LDAP_SLIST_REMOVE(&pool->ltp_active_list, ctx,
ldap_int_thread_ctx_s, ltc_next.al);
LDAP_SLIST_INSERT_HEAD(&pool->ltp_free_list, ctx, ltc_next.l);
pool->ltp_active_count--;
- ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
-
- ldap_pvt_thread_yield();
-
- /* if we use an idle timer, here's
- * a good place to update it
- */
- ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+ if (pool->ltp_state == LDAP_INT_THREAD_POOL_PAUSING) {
+ if (pool->ltp_active_count < 2) {
+ ldap_pvt_thread_cond_signal(&pool->ltp_pcond);
+ }
+ ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
+ }
}
for ( i=0; i<MAXKEYS && ltc_key[i].ltk_key; i++ ) {
ltc_key[i].ltk_data );
}
+ thread_keys[keyslot].ctx = NULL;
+ thread_keys[keyslot].id = tid_zero;
+
pool->ltp_open_count--;
+
+ /* let pool_destroy know we're all done */
+ if (pool->ltp_open_count < 1)
+ ldap_pvt_thread_cond_signal(&pool->ltp_cond);
+
ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
ldap_pvt_thread_exit(NULL);
return(NULL);
}
+int
+ldap_pvt_thread_pool_pause (
+ 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);
+
+ ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+
+ /* If someone else has already requested a pause, we have to wait */
+ while (pool->ltp_state == LDAP_INT_THREAD_POOL_PAUSING) {
+ pool->ltp_pending_count++;
+ pool->ltp_active_count--;
+ ldap_pvt_thread_cond_wait(&pool->ltp_cond, &pool->ltp_mutex);
+ pool->ltp_pending_count--;
+ pool->ltp_active_count++;
+ }
+ /* Wait for everyone else to finish */
+ pool->ltp_state = LDAP_INT_THREAD_POOL_PAUSING;
+ while (pool->ltp_active_count > 1) {
+ ldap_pvt_thread_cond_wait(&pool->ltp_pcond, &pool->ltp_mutex);
+ }
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ return(0);
+}
+
+int
+ldap_pvt_thread_pool_resume (
+ 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);
+
+ ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
+
+ pool->ltp_state = LDAP_INT_THREAD_POOL_RUNNING;
+ ldap_pvt_thread_cond_broadcast(&pool->ltp_cond);
+ ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ return(0);
+}
+
int ldap_pvt_thread_pool_getkey(
void *xctx,
void *key,
void **data,
ldap_pvt_thread_pool_keyfree_t **kfree )
{
- ldap_int_thread_ctx_t *ctx = xctx;
+ ldap_int_thread_key_t *ctx = xctx;
int i;
- if ( !ctx || !data || !ctx->ltc_key ) return EINVAL;
+ if ( !ctx || !data ) return EINVAL;
- for ( i=0; i<MAXKEYS && ctx->ltc_key[i].ltk_key; i++ ) {
- if ( ctx->ltc_key[i].ltk_key == key ) {
- *data = ctx->ltc_key[i].ltk_data;
- if ( kfree ) *kfree = ctx->ltc_key[i].ltk_free;
+ for ( i=0; i<MAXKEYS && ctx[i].ltk_key; i++ ) {
+ if ( ctx[i].ltk_key == key ) {
+ *data = ctx[i].ltk_data;
+ if ( kfree ) *kfree = ctx[i].ltk_free;
return 0;
}
}
void *data,
ldap_pvt_thread_pool_keyfree_t *kfree )
{
- ldap_int_thread_ctx_t *ctx = xctx;
+ ldap_int_thread_key_t *ctx = xctx;
int i;
- if ( !ctx || !key || !ctx->ltc_key ) return EINVAL;
+ if ( !ctx || !key ) return EINVAL;
for ( i=0; i<MAXKEYS; i++ ) {
- if ( !ctx->ltc_key[i].ltk_key || ctx->ltc_key[i].ltk_key == key ) {
- ctx->ltc_key[i].ltk_key = key;
- ctx->ltc_key[i].ltk_data = data;
- ctx->ltc_key[i].ltk_free = kfree;
+ if ( !ctx[i].ltk_key || ctx[i].ltk_key == key ) {
+ ctx[i].ltk_key = key;
+ ctx[i].ltk_data = data;
+ ctx[i].ltk_free = kfree;
return 0;
}
}
return ENOMEM;
}
+/* 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_key_t *ctx;
+
+ for ( i=0; i<LDAP_MAXTHR; i++ ) {
+ if ( thread_keys[i].ctx ) {
+ ctx = thread_keys[i].ctx;
+ for ( j=0; j<MAXKEYS; j++ ) {
+ if ( ctx[j].ltk_key == key ) {
+ if (ctx[j].ltk_free)
+ ctx[j].ltk_free( ctx[j].ltk_key, ctx[j].ltk_data );
+ ctx[j].ltk_key = NULL;
+ ctx[j].ltk_free = NULL;
+ break;
+ }
+ }
+ }
+ }
+}
+
/*
* This is necessary if the caller does not have access to the
* thread context handle (for example, a slapd plugin calling
* for the application to keep track of the thread context
* handles itself.
*/
-void *ldap_pvt_thread_pool_context( ldap_pvt_thread_pool_t *tpool )
+void *ldap_pvt_thread_pool_context( )
{
- ldap_pvt_thread_pool_t pool;
ldap_pvt_thread_t tid;
- ldap_int_thread_ctx_t *ptr;
-
- pool = *tpool;
- if (pool == NULL) {
- return NULL;
- }
+ int i, hash;
tid = ldap_pvt_thread_self();
+ if ( ldap_pvt_thread_equal( tid, ldap_int_main_tid ))
+ return ldap_int_main_thrctx;
- ldap_pvt_thread_mutex_lock(&pool->ltp_mutex);
- LDAP_SLIST_FOREACH(ptr, &pool->ltp_active_list, ltc_next.al)
- if (ptr != NULL && ptr->ltc_thread_id == tid) break;
- if (ptr != NULL && ptr->ltc_thread_id != tid) {
- ptr = NULL;
- }
- ldap_pvt_thread_mutex_unlock(&pool->ltp_mutex);
+ TID_HASH( tid, hash );
+ for (i = hash & (LDAP_MAXTHR-1);
+ !ldap_pvt_thread_equal(thread_keys[i].id, tid_zero) &&
+ !ldap_pvt_thread_equal(thread_keys[i].id, tid);
+ i = (i+1) & (LDAP_MAXTHR-1));
- return ptr;
+ return thread_keys[i].ctx;
}
-#endif /* LDAP_HAVE_THREAD_POOL */
+void ldap_pvt_thread_pool_context_reset( void *vctx )
+{
+ ldap_int_thread_key_t *ctx = vctx;
+ int i;
+
+ for ( i=0; i<MAXKEYS && ctx[i].ltk_key; i++) {
+ if ( ctx[i].ltk_free )
+ ctx[i].ltk_free( ctx[i].ltk_key, ctx[i].ltk_data );
+ ctx[i].ltk_key = NULL;
+ }
+}
+#endif /* LDAP_THREAD_HAVE_TPOOL */
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