[ViewVC] Diff of: cvs/BDB/BDB.pm

Comparing BDB/BDB.pm (file contents):
Revision 1.39 by root, Tue Jul 8 08:25:31 2008 UTC vs.
Revision 1.45 by root, Wed Jul 9 21:16:14 2008 UTC

 use strict 'vars';
 use base 'Exporter';
 BEGIN {
-   our $VERSION = '1.6';
+   our $VERSION = '1.7';
    our @BDB_REQ = qw(
       db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect
       db_env_memp_sync db_env_memp_trickle db_env_dbrename db_env_dbremove
       db_open db_close db_compact db_sync db_upgrade
-      db_put db_get db_pget db_del db_key_range
+      db_put db_exists db_get db_pget db_del db_key_range
       db_txn_commit db_txn_abort db_txn_finish
       db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del
       db_sequence_open db_sequence_close
       db_sequence_get db_sequence_remove
    );
 In the following, C<$int> signifies an integer return value,
 C<bdb_filename> is a "filename" (octets on unix, madness on windows),
 C<U32> is an unsigned 32 bit integer, C<int> is some integer, C<NV> is a
 floating point value.
-The C<SV *> types are generic perl scalars (for input and output of data
+Most C<SV *> types are generic perl scalars (for input and output of data
-values), and the C<SV *callback> is the optional callback function to call
+values).
-when the request is completed.
 The various C<DB_ENV> etc. arguments are handles return by
 C<db_env_create>, C<db_create>, C<txn_begin> and so on. If they have an
 appended C<_ornull> this means they are optional and you can pass C<undef>
 for them, resulting a NULL pointer on the C level.
+The C<SV *callback> is the optional callback function to call when the
+request is completed. This last callback argument is special: the callback
+is simply the last argument passed. If there are "optional" arguments
+before the callback they can be left out. The callback itself can be left
+out or specified as C<undef>, in which case the function will be executed
+synchronously.
+For example, C<db_env_txn_checkpoint> usually is called with all integer
+arguments zero. These can be left out, so all of these specify a call
+to C<< DB_ENV->txn_checkpoint >>, to be executed asynchronously with a
+callback to be called:
+   db_env_txn_checkpoint $db_env, 0, 0, 0, sub { };
+   db_env_txn_checkpoint $db_env, 0, 0, sub { };
+   db_env_txn_checkpoint $db_env, sub { };
+While these all specify a call to C<< DB_ENV->txn_checkpoint >> to be
+executed synchronously:
+   db_env_txn_checkpoint $db_env, 0, 0, 0, undef;
+   db_env_txn_checkpoint $db_env, 0, 0, 0;
+   db_env_txn_checkpoint $db_env, 0;
 =head3 BDB functions
 Functions in the BDB namespace, exported by default:
       flags: FREELIST_ONLY FREE_SPACE
    db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef)
    db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef)
    db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef)
       flags: APPEND NODUPDATA NOOVERWRITE
+   db_exists (DB *db, DB_TXN_ornull *txn, SV *key, U32 flags = 0, SV *callback = 0) (v4.6)
    db_get (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef)
       flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW
    db_pget (DB *db, DB_TXN_ornull *txn, SV *key, SV *pkey, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef)
       flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW
    db_del (DB *db, DB_TXN_ornull *txn, SV *key, U32 flags = 0, SV *callback = &PL_sv_undef)
    $int = $env->set_tmp_dir (const char *dir)
    $int = $env->set_lg_dir (const char *dir)
    $int = $env->set_shm_key (long shm_key)
    $int = $env->set_cachesize (U32 gbytes, U32 bytes, int ncache = 0)
    $int = $env->set_flags (U32 flags, int onoff = 1)
-   $int = $env->log_set_config (U32 flags, int onoff = 1) [v4.7]
+   $int = $env->log_set_config (U32 flags, int onoff = 1) (v4.7)
-   $int = $env->set_intermediate_dir_mode (const char *modestring) [v4.7]
+   $int = $env->set_intermediate_dir_mode (const char *modestring) (v4.7)
    $env->set_errfile (FILE *errfile = 0)
    $env->set_msgfile (FILE *msgfile = 0)
    $int = $env->set_verbose (U32 which, int onoff = 1)
    $int = $env->set_encrypt (const char *password, U32 flags = 0)
    $int = $env->set_timeout (NV timeout_seconds, U32 flags = SET_TXN_TIMEOUT)
    $int = $env->mutex_set_max (U32 max)
    $int = $env->mutex_set_align (U32 align)
    $txn = $env->txn_begin (DB_TXN_ornull *parent = 0, U32 flags = 0)
       flags: READ_COMMITTED READ_UNCOMMITTED TXN_NOSYNC TXN_NOWAIT TXN_SNAPSHOT TXN_SYNC TXN_WAIT TXN_WRITE_NOSYNC
+   $txn = $env->cdsgroup_begin; (v4.5)
 =head4 Example:
    use AnyEvent;
    use BDB;
    DESTROY (DBC_ornull *dbc)
            CODE:
            if (dbc)
              dbc->c_close (dbc);
-   $int = $cursor->set_priority ($priority = PRIORITY_*)
+   $int = $cursor->set_priority ($priority = PRIORITY_*) (v4.6)
 =head4 Example:
    my $c = $db->cursor;
 =head3 VERSION CHECKING
 BerkeleyDB comes in various versions, many of them have minor
 incompatibilities. This means that traditional "at least version x.x"
 checks are often not sufficient.
+Example: set the log_autoremove option in a way compatible with <v.47 and
+v4.7. Note the use of & on the constants to avoid triggering a compiletime
+bug when the symbol isn't available.
+   $DB_ENV->set_flags      (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7;
+   $DB_ENV->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7;
 =over 4
 =item BDB::VERSION

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Comparing BDB/BDB.pm (file contents): Revision 1.39 by root, Tue Jul 8 08:25:31 2008 UTC vs. Revision 1.45 by root, Wed Jul 9 21:16:14 2008 UTC

Diff Legend

Comparing BDB/BDB.pm (file contents):
Revision 1.39 by root, Tue Jul 8 08:25:31 2008 UTC vs.
Revision 1.45 by root, Wed Jul 9 21:16:14 2008 UTC