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BDB 4.3 compatibility, if the reader TXN is deadlocked we must abort

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and recreate it.
This commit is contained in:
Howard Chu 2004-10-16 13:07:01 +00:00
parent c41d0eaf7c
commit ca0bf91bba
1 changed files with 19 additions and 6 deletions
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25
servers/slapd/back-bdb/cache.c
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@ -31,7 +31,7 @@ static int bdb_cache_delete_internal(Cache *cache, EntryInfo *e);
static void bdb_lru_print(Cache *cache);
#endif
static int bdb_txn_get( Operation *op, DB_ENV *env, DB_TXN **txn );
static int bdb_txn_get( Operation *op, DB_ENV *env, DB_TXN **txn, int reset );
static EntryInfo *
bdb_cache_entryinfo_new( Cache *cache )
@ -672,7 +672,7 @@ load1: if ( !(*eip)->bei_e && !((*eip)->bei_state & CACHE_ENTRY_LOADING)) {
* we use a long-lived per-thread txn for this step.
*/
if ( !ep && !tid ) {
rc = bdb_txn_get( op, bdb->bi_dbenv, &ltid );
rc = bdb_txn_get( op, bdb->bi_dbenv, &ltid, 0 );
if ( ltid )
locker2 = TXN_ID( ltid );
} else {
@ -714,6 +714,12 @@ load1: if ( !(*eip)->bei_e && !((*eip)->bei_state & CACHE_ENTRY_LOADING)) {
list.obj = NULL;
bdb->bi_dbenv->lock_vec( bdb->bi_dbenv, locker2,
0, &list, 1, NULL );
/* If this txn was deadlocked, we must abort it
* and invalidate this per-thread txn.
*/
if ( rc == DB_LOCK_DEADLOCK ) {
bdb_txn_get( op, bdb->bi_dbenv, &ltid, 1 );
}
}
} else if ( !(*eip)->bei_e ) {
/* Some other thread is trying to load the entry,
@ -1144,12 +1150,13 @@ bdb_txn_free( void *key, void *data )
TXN_ABORT( txn );
}
/* Obtain a long-lived transaction for the current thread */
/* Obtain a long-lived transaction for the current thread.
* If reset == 1, remove the current transaction. */
static int
bdb_txn_get( Operation *op, DB_ENV *env, DB_TXN **txn )
bdb_txn_get( Operation *op, DB_ENV *env, DB_TXN **txn, int reset )
{
int i, rc, lockid;
void *ctx, *data;
void *ctx, *data = NULL;
/* If no op was provided, try to find the ctx anyway... */
if ( op ) {
@ -1164,7 +1171,13 @@ bdb_txn_get( Operation *op, DB_ENV *env, DB_TXN **txn )
return 0;
}
if ( ldap_pvt_thread_pool_getkey( ctx, ((char *)env)+1, &data, NULL ) ) {
if ( reset ) {
TXN_ABORT( *txn );
return ldap_pvt_thread_pool_setkey( ctx, ((char *)env)+1, NULL, NULL );
}
if ( ldap_pvt_thread_pool_getkey( ctx, ((char *)env)+1, &data, NULL ) ||
data == NULL ) {
for ( i=0, rc=1; rc != 0 && i<4; i++ ) {
rc = TXN_BEGIN( env, NULL, txn, 0 );
if (rc) ldap_pvt_thread_yield();