2005-09-05 09:32:44 +08:00
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/* alock.h - access lock header */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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2006-01-04 07:11:52 +08:00
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* Copyright 2005-2006 The OpenLDAP Foundation.
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2005-09-05 09:32:44 +08:00
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* Portions Copyright 2004-2005 Symas Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* ACKNOWLEDGEMENTS:
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* This work was initially developed by Matthew Backes at Symas
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* Corporation for inclusion in OpenLDAP Software.
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*/
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#ifndef _ALOCK_H_
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#define _ALOCK_H_
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#include "portable.h"
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#include <ac/time.h>
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#include <ac/unistd.h>
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/* environment states (all the slots together) */
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#define ALOCK_CLEAN (0)
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#define ALOCK_RECOVER (1)
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#define ALOCK_BUSY (2)
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#define ALOCK_UNSTABLE (3)
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/* lock user types and states */
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#define ALOCK_UNLOCKED (0)
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#define ALOCK_LOCKED (1)
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#define ALOCK_UNIQUE (2)
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#define ALOCK_DIRTY (3)
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/* constants */
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#define ALOCK_SLOT_SIZE (1024)
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#define ALOCK_SLOT_IATTRS (4)
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#define ALOCK_MAX_APPNAME (ALOCK_SLOT_SIZE - 8 * ALOCK_SLOT_IATTRS)
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#define ALOCK_MAGIC (0x12345678)
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LDAP_BEGIN_DECL
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typedef struct alock_info {
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int al_fd;
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int al_slot;
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} alock_info_t;
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typedef struct alock_slot {
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unsigned int al_lock;
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time_t al_stamp;
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pid_t al_pid;
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char * al_appname;
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} alock_slot_t;
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LDAP_SLAPD_F (int) alock_open LDAP_P(( alock_info_t * info, const char * appname,
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const char * envdir, int locktype ));
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LDAP_SLAPD_F (int) alock_scan LDAP_P(( alock_info_t * info ));
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LDAP_SLAPD_F (int) alock_close LDAP_P(( alock_info_t * info ));
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LDAP_SLAPD_F (int) alock_recover LDAP_P(( alock_info_t * info ));
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LDAP_END_DECL
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#endif
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