/* LDBM backend specific entry info -- visible only to the cache */
typedef struct ldbm_entry_info {
-#ifdef LDBM_ENTRY_RWLOCK
- ldap_pvt_thread_rdwr_t lei_rdwr; /* reader/writer lock */
-#endif
-
/*
- * remaining fields require backend cache lock to access
* These items are specific to the LDBM backend and should
- * be hidden.
+ * be hidden. Backend cache lock required to access.
*/
int lei_state; /* for the cache */
#define CACHE_ENTRY_UNDEFINED 0
static void lru_print(Cache *cache);
#endif
-#ifdef LDBM_ENTRY_RWLOCK
-static int
-cache_entry_rdwr_lock(Entry *e, int rw)
-{
-#ifdef NEW_LOGGING
- LDAP_LOG(( "cache", LDAP_LEVEL_ENTRY,
- "cache_entry_rdwr_lock: %s lock on ID %ld\n",
- rw ? "w" : "r", e->e_id ));
-#else
- Debug( LDAP_DEBUG_ARGS, "entry_rdwr_%slock: ID: %ld\n",
- rw ? "w" : "r", e->e_id, 0);
-#endif
-
-
- if (rw)
- return ldap_pvt_thread_rdwr_wlock(&LEI(e)->lei_rdwr);
- else
- return ldap_pvt_thread_rdwr_rlock(&LEI(e)->lei_rdwr);
-}
-
-static int
-cache_entry_rdwr_trylock(Entry *e, int rw)
-{
-#ifdef NEW_LOGGING
- LDAP_LOG(( "cache", LDAP_LEVEL_ENTRY,
- "cache_entry_rdwr_trylock: try %s lock on ID: %ld.\n",
- rw ? "w" : "r", e->e_id ));
-#else
- Debug( LDAP_DEBUG_ARGS, "entry_rdwr_%strylock: ID: %ld\n",
- rw ? "w" : "r", e->e_id, 0);
-#endif
-
-
- if (rw)
- return ldap_pvt_thread_rdwr_wtrylock(&LEI(e)->lei_rdwr);
- else
- return ldap_pvt_thread_rdwr_rtrylock(&LEI(e)->lei_rdwr);
-}
-
-static int
-cache_entry_rdwr_unlock(Entry *e, int rw)
-{
-#ifdef NEW_LOGGING
- LDAP_LOG(( "cache", LDAP_LEVEL_ENTRY,
- "cache_entry_rdwr_unlock: remove %s lock on ID %ld.\n",
- rw ? "w" : "r", e->e_id ));
-#else
- Debug( LDAP_DEBUG_ARGS, "entry_rdwr_%sunlock: ID: %ld\n",
- rw ? "w" : "r", e->e_id, 0);
-#endif
-
-
- if (rw)
- return ldap_pvt_thread_rdwr_wunlock(&LEI(e)->lei_rdwr);
- else
- return ldap_pvt_thread_rdwr_runlock(&LEI(e)->lei_rdwr);
-}
-
-static int
-cache_entry_rdwr_init(Entry *e)
-{
- return ldap_pvt_thread_rdwr_init( &LEI(e)->lei_rdwr );
-}
-
-static int
-cache_entry_rdwr_destroy(Entry *e)
-{
- return ldap_pvt_thread_rdwr_destroy( &LEI(e)->lei_rdwr );
-}
-#endif
-
static int
cache_entry_private_init( Entry*e )
{
e->e_private = ch_calloc(1, sizeof(struct ldbm_entry_info));
-#ifdef LDBM_ENTRY_RWLOCK
- if( cache_entry_rdwr_init( e ) != 0 ) {
- free( LEI(e) );
- e->e_private = NULL;
- return 1;
- }
-#endif
-
return 0;
}
{
assert( e->e_private );
-#ifdef LDBM_ENTRY_RWLOCK
- cache_entry_rdwr_destroy( e );
-#endif
-
free( e->e_private );
e->e_private = NULL;
return 0;
assert( e->e_private );
-#ifdef LDBM_ENTRY_RWLOCK
- cache_entry_rdwr_unlock(e, rw);
-#endif
-
id = e->e_id;
refcnt = --LEI(e)->lei_refcnt;
rw ? "w" : "r", id, refcnt );
#endif
-
} else if ( LEI(e)->lei_state == CACHE_ENTRY_DELETED ) {
if( refcnt > 0 ) {
/* free cache mutex */
rw ? "w" : "r", id, refcnt );
#endif
-
} else {
cache_entry_private_destroy( e );
if ( freeit ) {
"====> cache_return_entry_%s( %ld ): deleted (%d)\n",
rw ? "w" : "r", id, refcnt );
#endif
-
}
} else {
"====> cache_return_entry_%s( %ld ): returned (%d)\n",
rw ? "w" : "r", id, refcnt);
#endif
-
}
}
e->e_id, e->e_dn, 0 );
#endif
-
return( -1 );
}
e->e_id, e->e_dn, 0 );
#endif
-
cache_entry_private_destroy(e);
return( 1 );
return( -1 );
}
-#ifdef LDBM_ENTRY_RWLOCK
- cache_entry_rdwr_lock( e, rw );
-#endif
-
/* put the entry into 'CREATING' state */
/* will be marked after when entry is returned */
LEI(e)->lei_state = CACHE_ENTRY_CREATING;
e->e_id, e->e_dn, 0 );
#endif
-
/* free cache mutex */
ldap_pvt_thread_mutex_unlock( &cache->c_mutex );
return( 1 );
e->e_id, e->e_dn, 0 );
#endif
-
/* delete from dn tree inserted above */
if ( avl_delete( &cache->c_dntree, (caddr_t) e,
(AVL_CMP) entry_dn_cmp ) == NULL )
Debug( LDAP_DEBUG_ANY, "====> can't delete from dn cache\n",
0, 0, 0 );
#endif
-
}
/* free cache mutex */
return( -1 );
}
-
/* put the entry into 'CREATING' state */
/* will be marked after when entry is returned */
LEI(e)->lei_state = CACHE_ENTRY_CREATING;
* we do not need to lock the entry if we only
* check the state, refcnt, LRU, and id.
*/
-
assert( ep->e_private );
/* save id */
ndn->bv_val, id, state);
#endif
-
ldap_pvt_thread_yield();
goto try_again;
}
ndn->bv_val, id, count);
#endif
-
} else {
/* free cache mutex */
ldap_pvt_thread_mutex_unlock( &cache->c_mutex );
-
id = NOID;
}
* entry is deleted or not fully created yet
*/
if ( state != CACHE_ENTRY_READY ) {
-
assert(state != CACHE_ENTRY_UNDEFINED);
/* free cache mutex */
id, ep_id, state);
#endif
-
- ldap_pvt_thread_yield();
- goto try_again;
- }
-
-#ifdef LDBM_ENTRY_RWLOCK
- /* acquire reader lock */
- if ( cache_entry_rdwr_trylock(ep, rw) == LDAP_PVT_THREAD_EBUSY ) {
- /* could not acquire entry lock...
- * owner cannot free as we have the cache locked.
- * so, unlock the cache, yield, and try again.
- */
-
- /* free cache mutex */
- ldap_pvt_thread_mutex_unlock( &cache->c_mutex );
-
-#ifdef NEW_LOGGING
- LDAP_LOG(( "cache", LDAP_LEVEL_INFO,
- "cache_find_entry_id: %ld -> %ld (busy) %d.\n",
- id, ep_id, state ));
-#else
- Debug(LDAP_DEBUG_TRACE,
- "====> cache_find_entry_id( %ld ): %ld (busy) %d\n",
- id, ep_id, state);
-#endif
-
-
ldap_pvt_thread_yield();
goto try_again;
}
-#endif
/* lru */
LRU_DELETE( cache, ep );
ep_id, ep->e_dn, count);
#endif
-
return( ep );
}
e->e_id, 0, 0 );
#endif
-
rc = cache_delete_entry_internal( cache, e );
/* free cache mutex */
while ( (e = cache->c_lrutail) != NULL && LEI(e)->lei_refcnt == 0 ) {
-#ifdef LDAP_RDWR_DEBUG
- assert(!ldap_pvt_thread_rdwr_active(&LEI(e)->lei_rdwr));
-#endif
-
/* delete from cache and lru q */
/* XXX do we need rc ? */
rc = cache_delete_entry_internal( cache, e );
#else
Debug( LDAP_DEBUG_TRACE, "Entry-cache could not be emptied\n", 0, 0, 0 );
#endif
-
}
/* free cache mutex */
}
#ifdef LDAP_DEBUG
-
static void
lru_print( Cache *cache )
{
e->e_dn, e->e_id, LEI(e)->lei_refcnt );
}
}
-
#endif
-
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