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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 11:11:40 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 11:11:40 +0000 |
commit | 7731832751ab9f3c6ddeb66f186d3d7fa1934a6d (patch) | |
tree | e91015872543a59be2aad26c2fea02e41b57005d /servers/slapd/back-bdb/trans.c | |
parent | Initial commit. (diff) | |
download | openldap-upstream/2.4.57+dfsg.tar.xz openldap-upstream/2.4.57+dfsg.zip |
Adding upstream version 2.4.57+dfsg.upstream/2.4.57+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'servers/slapd/back-bdb/trans.c')
-rw-r--r-- | servers/slapd/back-bdb/trans.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/servers/slapd/back-bdb/trans.c b/servers/slapd/back-bdb/trans.c new file mode 100644 index 0000000..92da8be --- /dev/null +++ b/servers/slapd/back-bdb/trans.c @@ -0,0 +1,56 @@ +/* trans.c - bdb backend transaction routines */ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 2000-2021 The OpenLDAP Foundation. + * All rights reserved. + * + * 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 the file LICENSE in the + * top-level directory of the distribution or, alternatively, at + * <http://www.OpenLDAP.org/license.html>. + */ + +#include "portable.h" + +#include <stdio.h> +#include <ac/string.h> + +#include "back-bdb.h" +#include "lber_pvt.h" +#include "lutil.h" + + +/* Congestion avoidance code + * for Deadlock Rollback + */ + +void +bdb_trans_backoff( int num_retries ) +{ + int i; + int delay = 0; + int pow_retries = 1; + unsigned long key = 0; + unsigned long max_key = -1; + struct timeval timeout; + + lutil_entropy( (unsigned char *) &key, sizeof( unsigned long )); + + for ( i = 0; i < num_retries; i++ ) { + if ( i >= 5 ) break; + pow_retries *= 4; + } + + delay = 16384 * (key * (double) pow_retries / (double) max_key); + delay = delay ? delay : 1; + + Debug( LDAP_DEBUG_TRACE, "delay = %d, num_retries = %d\n", delay, num_retries, 0 ); + + timeout.tv_sec = delay / 1000000; + timeout.tv_usec = delay % 1000000; + select( 0, NULL, NULL, NULL, &timeout ); +} |