/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
- * Copyright 1998-2005 The OpenLDAP Foundation.
+ * Copyright 1998-2006 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#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;
static ldap_pvt_thread_t tid_zero;
-#ifdef HAVE_PTHREADS
-#define TID_EQ(a,b) pthread_equal((a),(b))
-#else
-#define TID_EQ(a,b) ((a) == (b))
-#endif
static struct {
ldap_pvt_thread_t id;
ldap_int_thread_key_t *ctx;
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);
}
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);
}
+typedef struct ldap_lazy_sem_t {
+ ldap_pvt_thread_mutex_t ls_mutex;
+ ldap_pvt_thread_cond_t ls_cond;
+ int ls_sem_value;
+ /*
+ * when more than ls_lazy_count number of resources
+ * becmoes available, the thread wating for the resources will
+ * be waken up in order to prevent frequent blocking/waking-up
+ */
+ unsigned int ls_lazy_count;
+ /*
+ * only one thread(listener) will wait on this semaphore
+ * using a flag instead of a list
+ */
+ int ls_wait;
+} ldap_lazy_sem_t;
+
+ldap_lazy_sem_t* thread_pool_sem = NULL;
+
+int
+ldap_lazy_sem_init( unsigned int value, unsigned int lazyness )
+{
+ thread_pool_sem = (ldap_lazy_sem_t*) LDAP_CALLOC(1,
+ sizeof( ldap_lazy_sem_t ));
+
+ if( thread_pool_sem == NULL ) return -1;
+
+ ldap_pvt_thread_mutex_init( &thread_pool_sem->ls_mutex );
+ ldap_pvt_thread_cond_init( &thread_pool_sem->ls_cond );
+ thread_pool_sem->ls_sem_value = value;
+ thread_pool_sem->ls_lazy_count = lazyness;
+ thread_pool_sem->ls_wait = 0;
+
+ return 0;
+}
+
+/* FIXME: move to some approprite header */
+int ldap_lazy_sem_dec( ldap_lazy_sem_t* ls );
+int ldap_lazy_sem_wait ( ldap_lazy_sem_t* ls );
+
+/*
+ * ldap_lazy_sem_wait is used if a caller is blockable(listener).
+ * Otherwise use ldap_lazy_sem_dec (worker)
+ */
+int
+ldap_lazy_sem_op_submit( ldap_lazy_sem_t* ls )
+{
+ if ( ls == NULL ) return -1;
+
+ /* only worker thread has its thread ctx */
+ if ( ldap_pvt_thread_pool_context() ) {
+ /* worker thread */
+ return ldap_lazy_sem_dec( ls );
+ } else {
+ /* listener */
+ return ldap_lazy_sem_wait( ls );
+ }
+}
+
+/*
+ * test if given semaphore's count is zero.
+ * If 0, the caller is blocked
+ * If not, the count is decremented.
+ */
+int
+ldap_lazy_sem_wait ( ldap_lazy_sem_t* ls )
+{
+ ldap_pvt_thread_mutex_lock( &ls->ls_mutex );
+
+lazy_sem_retry:
+ if ( ls->ls_sem_value <= 0 ) {
+ /* no more avaliable resources */
+ ls->ls_wait = 1;
+ ldap_pvt_thread_cond_wait( &ls->ls_cond, &ls->ls_mutex );
+ goto lazy_sem_retry;
+ } else {
+ /* avaliable resources */
+ ls->ls_sem_value--;
+ }
+
+ ldap_pvt_thread_mutex_unlock( &ls->ls_mutex );
+
+ return 0;
+}
+
+/*
+ * decrement the count without blocking
+ * even when the count becomes less than or equal to 0
+ */
+int
+ldap_lazy_sem_dec( ldap_lazy_sem_t* ls )
+{
+ ldap_pvt_thread_mutex_lock( &ls->ls_mutex );
+
+ ls->ls_sem_value--;
+
+ ldap_pvt_thread_mutex_unlock( &ls->ls_mutex );
+
+ return 0;
+}
+
+/*
+ * Increment the count by one and test if it is greater or
+ * equal to lazyness. If it is, wake up a blocked thread.
+ */
+int
+ldap_lazy_sem_post( ldap_lazy_sem_t* ls )
+{
+ if( ls == NULL ) return (-1);
+
+ ldap_pvt_thread_mutex_lock( &ls->ls_mutex );
+
+ ls->ls_sem_value++;
+ if ( ls->ls_wait ) {
+ if ( ls->ls_sem_value >= ls->ls_lazy_count ) {
+ ls->ls_wait = 0;
+ ldap_pvt_thread_cond_signal( &ls->ls_cond );
+ }
+ }
+
+ ldap_pvt_thread_mutex_unlock( &ls->ls_mutex );
+
+ return 0;
+}
+
int
ldap_pvt_thread_pool_init (
ldap_pvt_thread_pool_t *tpool,
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 { int i; \
+#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)
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);
+#ifdef LDAP_PVT_THREAD_POOL_SEM_LOAD_CONTROL
+ ldap_lazy_sem_op_submit( thread_pool_sem );
+#endif
+
if (need_thread) {
int rc;
*/
TID_HASH(thr, hash);
for (rc = hash & (LDAP_MAXTHR-1);
- !TID_EQ(thread_keys[rc].id, tid_zero);
+ !ldap_pvt_thread_equal(thread_keys[rc].id, tid_zero);
rc = (rc+1) & (LDAP_MAXTHR-1));
thread_keys[rc].id = thr;
} else {
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);
+#ifdef LDAP_PVT_THREAD_POOL_SEM_LOAD_CONTROL
+ if ( thread_pool_sem ) {
+ LDAP_FREE( thread_pool_sem );
+ }
+#endif
return(0);
}
/* store pointer to our keys */
TID_HASH(tid, hash);
- for (i = hash & (LDAP_MAXTHR-1); !TID_EQ(thread_keys[i].id, tid);
+ 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;
* 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;
}
ctx->ltc_start_routine(ltc_key, ctx->ltc_arg);
+#ifdef LDAP_PVT_THREAD_POOL_SEM_LOAD_CONTROL
+ ldap_lazy_sem_post( thread_pool_sem );
+#endif
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++ ) {
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,
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
int i, hash;
tid = ldap_pvt_thread_self();
+ if ( ldap_pvt_thread_equal( tid, ldap_int_main_tid ))
+ return ldap_int_main_thrctx;
TID_HASH( tid, hash );
- for (i = hash & (LDAP_MAXTHR-1); !TID_EQ(thread_keys[i].id, tid_zero) &&
- !TID_EQ(thread_keys[i].id, tid); i = (i+1) & (LDAP_MAXTHR-1));
+ 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 thread_keys[i].ctx;
}
+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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