From 0eac91fcc7affeb68f2dcb5d3e08ed29d53c9e21 Mon Sep 17 00:00:00 2001
From: Kurt Zeilenga <kurt@openldap.org>
Date: Tue, 29 Jan 2002 20:05:55 +0000
Subject: [PATCH] Entry rwlock is no longer needed as concurrency is managed by
 the giant rwlock.

---
 servers/slapd/back-ldbm/cache.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/servers/slapd/back-ldbm/cache.c b/servers/slapd/back-ldbm/cache.c
index 1a9f1c6fcf..b5aaaa2f37 100644
--- a/servers/slapd/back-ldbm/cache.c
+++ b/servers/slapd/back-ldbm/cache.c
@@ -19,7 +19,9 @@
 
 /* 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
@@ -45,6 +47,7 @@ static int	cache_delete_entry_internal(Cache *cache, Entry *e);
 static void	lru_print(Cache *cache);
 #endif
 
+#ifdef LDBM_ENTRY_RWLOCK
 static int
 cache_entry_rdwr_lock(Entry *e, int rw)
 {
@@ -113,6 +116,7 @@ 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 )
@@ -126,11 +130,13 @@ 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;
 }
@@ -157,7 +163,9 @@ cache_entry_private_destroy( Entry*e )
 {
 	assert( e->e_private );
 
+#ifdef LDBM_ENTRY_RWLOCK
 	cache_entry_rdwr_destroy( e );
+#endif
 
 	free( e->e_private );
 	e->e_private = NULL;
@@ -175,7 +183,9 @@ cache_return_entry_rw( Cache *cache, Entry *e, int rw )
 
 	assert( e->e_private );
 
+#ifdef LDBM_ENTRY_RWLOCK
 	cache_entry_rdwr_unlock(e, rw);
+#endif
 
 	id = e->e_id;
 	refcnt = --LEI(e)->lei_refcnt;
@@ -367,8 +377,6 @@ cache_add_entry_rw(
 		    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 )
@@ -381,7 +389,6 @@ cache_add_entry_rw(
 			Debug( LDAP_DEBUG_ANY, "====> can't delete from dn cache\n",
 			    0, 0, 0 );
 #endif
-
 		}
 
 		cache_entry_private_destroy(e);
@@ -391,7 +398,9 @@ cache_add_entry_rw(
 		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 */
@@ -711,6 +720,7 @@ try_again:
 			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...
@@ -735,6 +745,7 @@ try_again:
 			ldap_pvt_thread_yield();
 			goto try_again;
 		}
+#endif
 
 		/* lru */
 		LRU_DELETE( cache, ep );
-- 
2.39.5