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https://git.openldap.org/openldap/openldap.git
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139 lines
2.6 KiB
C
139 lines
2.6 KiB
C
/* nextid.c - keep track of the next id to be given out */
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/* $OpenLDAP$ */
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/*
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* Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/string.h>
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#include <ac/socket.h>
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#include "slap.h"
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#include "back-ldbm.h"
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static ID
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next_id_read( Backend *be )
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{
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ID id = NOID;
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Datum key, data;
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DBCache *db;
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if ( (db = ldbm_cache_open( be, "nextid", LDBM_SUFFIX, LDBM_WRCREAT ))
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== NULL ) {
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#ifdef NEW_LOGGING
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LDAP_LOG(( "backend", LDAP_LEVEL_CRIT,
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"next_id_read: could not open/create nextid%s\n", LDBM_SUFFIX ));
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#else
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Debug( LDAP_DEBUG_ANY, "Could not open/create nextid" LDBM_SUFFIX "\n",
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0, 0, 0 );
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#endif
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return( NOID );
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}
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ldbm_datum_init( key );
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key.dptr = (char *) &id;
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key.dsize = sizeof(ID);
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data = ldbm_cache_fetch( db, key );
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if( data.dptr != NULL ) {
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AC_MEMCPY( &id, data.dptr, sizeof( ID ) );
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ldbm_datum_free( db->dbc_db, data );
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} else {
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id = 1;
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}
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ldbm_cache_close( be, db );
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return id;
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}
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ID
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next_id_write( Backend *be, ID id )
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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Datum key, data;
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DBCache *db;
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ID noid = NOID;
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int flags;
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if ( (db = ldbm_cache_open( be, "nextid", LDBM_SUFFIX, LDBM_WRCREAT ))
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== NULL ) {
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#ifdef NEW_LOGGING
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LDAP_LOG(( "backend", LDAP_LEVEL_CRIT,
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"next_id_write: Could not open/create nextid%s\n", LDBM_SUFFIX ));
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#else
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Debug( LDAP_DEBUG_ANY, "Could not open/create nextid" LDBM_SUFFIX "\n",
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0, 0, 0 );
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#endif
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return( NOID );
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}
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ldbm_datum_init( key );
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ldbm_datum_init( data );
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key.dptr = (char *) &noid;
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key.dsize = sizeof(ID);
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data.dptr = (char *) &id;
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data.dsize = sizeof(ID);
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flags = LDBM_REPLACE;
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if ( ldbm_cache_store( db, key, data, flags ) != 0 ) {
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id = NOID;
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}
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ldbm_cache_close( be, db );
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return id;
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}
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ID
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next_id_get( Backend *be )
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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ID id = NOID;
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ldap_pvt_thread_mutex_lock( &li->li_nextid_mutex );
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if ( li->li_nextid == NOID ) {
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li->li_nextid = next_id_read( be );
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}
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id = li->li_nextid;
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ldap_pvt_thread_mutex_unlock( &li->li_nextid_mutex );
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return id;
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}
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ID
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next_id( Backend *be )
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{
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struct ldbminfo *li = (struct ldbminfo *) be->be_private;
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ID id = NOID;
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ldap_pvt_thread_mutex_lock( &li->li_nextid_mutex );
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if ( li->li_nextid == NOID ) {
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li->li_nextid = next_id_read( be );
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}
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if ( li->li_nextid != NOID ) {
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id = li->li_nextid++;
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(void) next_id_write( be, li->li_nextid );
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}
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ldap_pvt_thread_mutex_unlock( &li->li_nextid_mutex );
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return id;
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}
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