external/bsd/openldap/dist/servers/slapd/alock.h

   1 /* alock.h - access lock header */
   2 /* $OpenLDAP: pkg/ldap/servers/slapd/alock.h,v 1.3.2.4 2008/02/11 23:26:43 kurt Exp $ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2005-2008 The OpenLDAP Foundation.
   6  * Portions Copyright 2004-2005 Symas Corporation.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted only as authorized by the OpenLDAP
  11  * Public License.
  12  *
  13  * A copy of this license is available in the file LICENSE in the
  14  * top-level directory of the distribution or, alternatively, at
  15  * <http://www.OpenLDAP.org/license.html>.
  16  */
  17 /* ACKNOWLEDGEMENTS:
  18  * This work was initially developed by Matthew Backes at Symas
  19  * Corporation for inclusion in OpenLDAP Software.
  20  */
  21
  22 #ifndef _ALOCK_H_
  23 #define _ALOCK_H_
  24
  25 #include "portable.h"
  26 #include <ac/time.h>
  27 #include <ac/unistd.h>
  28
  29 /* environment states (all the slots together) */
  30 #define ALOCK_CLEAN             (0)
  31 #define ALOCK_RECOVER   (1)
  32 #define ALOCK_BUSY              (2)
  33 #define ALOCK_UNSTABLE  (3)
  34
  35 /* lock user types and states */
  36 #define ALOCK_UNLOCKED  (0)
  37 #define ALOCK_LOCKED    (1)
  38 #define ALOCK_UNIQUE    (2)
  39 #define ALOCK_DIRTY             (3)
  40
  41 #define ALOCK_SMASK             3
  42
  43 /* lock/state where recovery is not available */
  44 #define ALOCK_NOSAVE    4
  45
  46 /* constants */
  47 #define ALOCK_SLOT_SIZE         (1024)
  48 #define ALOCK_SLOT_IATTRS       (4)
  49 #define ALOCK_MAX_APPNAME       (ALOCK_SLOT_SIZE - 8 * ALOCK_SLOT_IATTRS)
  50 #define ALOCK_MAGIC                     (0x12345678)
  51
  52 LDAP_BEGIN_DECL
  53
  54 typedef struct alock_info {
  55         int al_fd;
  56         int al_slot;
  57 } alock_info_t;
  58
  59 typedef struct alock_slot {
  60         unsigned int al_lock;
  61         time_t al_stamp;
  62         pid_t al_pid;
  63         char * al_appname;
  64 } alock_slot_t;
  65
  66 LDAP_SLAPD_F (int) alock_open LDAP_P(( alock_info_t * info, const char * appname,
  67         const char * envdir, int locktype ));
  68 LDAP_SLAPD_F (int) alock_scan LDAP_P(( alock_info_t * info ));
  69 LDAP_SLAPD_F (int) alock_close LDAP_P(( alock_info_t * info, int nosave ));
  70 LDAP_SLAPD_F (int) alock_recover LDAP_P(( alock_info_t * info ));
  71
  72 LDAP_END_DECL
  73
  74 #endif