… | |
… | |
27 | db_sync $db; |
27 | db_sync $db; |
28 | |
28 | |
29 | # when you also use Coro, management is easy: |
29 | # when you also use Coro, management is easy: |
30 | use Coro::BDB; |
30 | use Coro::BDB; |
31 | |
31 | |
32 | # automatic result processing with AnyEvent: |
32 | # automatic event loop intergration with AnyEvent: |
33 | our $FH; open $FH, "<&=" . BDB::poll_fileno; |
33 | use AnyEvent::BDB; |
34 | our $WATCHER = AnyEvent->io (fh => $FH, poll => 'r', cb => \&BDB::poll_cb); |
|
|
35 | |
34 | |
36 | # automatic result processing with EV: |
35 | # automatic result processing with EV: |
37 | my $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb; |
36 | my $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb; |
38 | |
37 | |
39 | # with Glib: |
38 | # with Glib: |
… | |
… | |
110 | use strict 'vars'; |
109 | use strict 'vars'; |
111 | |
110 | |
112 | use base 'Exporter'; |
111 | use base 'Exporter'; |
113 | |
112 | |
114 | BEGIN { |
113 | BEGIN { |
115 | our $VERSION = '1.45'; |
114 | our $VERSION = '1.5'; |
116 | |
115 | |
117 | our @BDB_REQ = qw( |
116 | our @BDB_REQ = qw( |
118 | db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect |
117 | db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect |
119 | db_env_memp_sync db_env_memp_trickle |
118 | db_env_memp_sync db_env_memp_trickle db_env_dbrename db_env_dbremove |
120 | db_open db_close db_compact db_sync db_upgrade |
119 | db_open db_close db_compact db_sync db_upgrade |
121 | db_put db_get db_pget db_del db_key_range |
120 | db_put db_get db_pget db_del db_key_range |
122 | db_txn_commit db_txn_abort db_txn_finish |
121 | db_txn_commit db_txn_abort db_txn_finish |
123 | db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del |
122 | db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del |
124 | db_sequence_open db_sequence_close |
123 | db_sequence_open db_sequence_close |
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… | |
157 | settings) are method calls on the relevant objects, so the rule of thumb |
156 | settings) are method calls on the relevant objects, so the rule of thumb |
158 | is: if it's a method, it's not blocking, if it's a function, it takes a |
157 | is: if it's a method, it's not blocking, if it's a function, it takes a |
159 | callback as last argument. |
158 | callback as last argument. |
160 | |
159 | |
161 | In the following, C<$int> signifies an integer return value, |
160 | In the following, C<$int> signifies an integer return value, |
162 | C<octetstring> is a "binary string" (i.e. a perl string with no character |
161 | C<bdb_filename> is a "filename" (octets on unix, madness on windows), |
163 | indices >255), C<U32> is an unsigned 32 bit integer, C<int> is some |
162 | C<U32> is an unsigned 32 bit integer, C<int> is some integer, C<NV> is a |
164 | integer, C<NV> is a floating point value. |
163 | floating point value. |
165 | |
164 | |
166 | The C<SV *> types are generic perl scalars (for input and output of data |
165 | The C<SV *> types are generic perl scalars (for input and output of data |
167 | values), and the C<SV *callback> is the optional callback function to call |
166 | values), and the C<SV *callback> is the optional callback function to call |
168 | when the request is completed. |
167 | when the request is completed. |
169 | |
168 | |
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177 | Functions in the BDB namespace, exported by default: |
176 | Functions in the BDB namespace, exported by default: |
178 | |
177 | |
179 | $env = db_env_create (U32 env_flags = 0) |
178 | $env = db_env_create (U32 env_flags = 0) |
180 | flags: RPCCLIENT |
179 | flags: RPCCLIENT |
181 | |
180 | |
182 | db_env_open (DB_ENV *env, octetstring db_home, U32 open_flags, int mode, SV *callback = &PL_sv_undef) |
181 | db_env_open (DB_ENV *env, bdb_filename db_home, U32 open_flags, int mode, SV *callback = &PL_sv_undef) |
183 | open_flags: INIT_CDB INIT_LOCK INIT_LOG INIT_MPOOL INIT_REP INIT_TXN RECOVER RECOVER_FATAL USE_ENVIRON USE_ENVIRON_ROOT CREATE LOCKDOWN PRIVATE REGISTER SYSTEM_MEM |
182 | open_flags: INIT_CDB INIT_LOCK INIT_LOG INIT_MPOOL INIT_REP INIT_TXN RECOVER RECOVER_FATAL USE_ENVIRON USE_ENVIRON_ROOT CREATE LOCKDOWN PRIVATE REGISTER SYSTEM_MEM |
184 | db_env_close (DB_ENV *env, U32 flags = 0, SV *callback = &PL_sv_undef) |
183 | db_env_close (DB_ENV *env, U32 flags = 0, SV *callback = &PL_sv_undef) |
185 | db_env_txn_checkpoint (DB_ENV *env, U32 kbyte = 0, U32 min = 0, U32 flags = 0, SV *callback = &PL_sv_undef) |
184 | db_env_txn_checkpoint (DB_ENV *env, U32 kbyte = 0, U32 min = 0, U32 flags = 0, SV *callback = &PL_sv_undef) |
186 | flags: FORCE |
185 | flags: FORCE |
187 | db_env_lock_detect (DB_ENV *env, U32 flags = 0, U32 atype = DB_LOCK_DEFAULT, SV *dummy = 0, SV *callback = &PL_sv_undef) |
186 | db_env_lock_detect (DB_ENV *env, U32 flags = 0, U32 atype = DB_LOCK_DEFAULT, SV *dummy = 0, SV *callback = &PL_sv_undef) |
188 | atype: LOCK_DEFAULT LOCK_EXPIRE LOCK_MAXLOCKS LOCK_MAXWRITE LOCK_MINLOCKS LOCK_MINWRITE LOCK_OLDEST LOCK_RANDOM LOCK_YOUNGEST |
187 | atype: LOCK_DEFAULT LOCK_EXPIRE LOCK_MAXLOCKS LOCK_MAXWRITE LOCK_MINLOCKS LOCK_MINWRITE LOCK_OLDEST LOCK_RANDOM LOCK_YOUNGEST |
189 | db_env_memp_sync (DB_ENV *env, SV *dummy = 0, SV *callback = &PL_sv_undef) |
188 | db_env_memp_sync (DB_ENV *env, SV *dummy = 0, SV *callback = &PL_sv_undef) |
190 | db_env_memp_trickle (DB_ENV *env, int percent, SV *dummy = 0, SV *callback = &PL_sv_undef) |
189 | db_env_memp_trickle (DB_ENV *env, int percent, SV *dummy = 0, SV *callback = &PL_sv_undef) |
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190 | db_env_dbremove (DB_ENV *env, DB_TXN_ornull *txnid, bdb_filename file, bdb_filename database, U32 flags = 0, SV *callback = &PL_sv_undef) |
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191 | db_env_dbrename (DB_ENV *env, DB_TXN_ornull *txnid, bdb_filename file, bdb_filename database, bdb_filename newname, U32 flags = 0, SV *callback = &PL_sv_undef) |
191 | |
192 | |
192 | $db = db_create (DB_ENV *env = 0, U32 flags = 0) |
193 | $db = db_create (DB_ENV *env = 0, U32 flags = 0) |
193 | flags: XA_CREATE |
194 | flags: XA_CREATE |
194 | |
195 | |
195 | db_open (DB *db, DB_TXN_ornull *txnid, octetstring file, octetstring database, int type, U32 flags, int mode, SV *callback = &PL_sv_undef) |
196 | db_open (DB *db, DB_TXN_ornull *txnid, bdb_filename file, bdb_filename database, int type, U32 flags, int mode, SV *callback = &PL_sv_undef) |
196 | flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE |
197 | flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE |
197 | db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
198 | db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
198 | flags: DB_NOSYNC |
199 | flags: DB_NOSYNC |
199 | db_upgrade (DB *db, octetstring file, U32 flags = 0, SV *callback = &PL_sv_undef) |
200 | db_upgrade (DB *db, bdb_filename file, U32 flags = 0, SV *callback = &PL_sv_undef) |
200 | db_compact (DB *db, DB_TXN_ornull *txn = 0, SV *start = 0, SV *stop = 0, SV *unused1 = 0, U32 flags = DB_FREE_SPACE, SV *unused2 = 0, SV *callback = &PL_sv_undef) |
201 | db_compact (DB *db, DB_TXN_ornull *txn = 0, SV *start = 0, SV *stop = 0, SV *unused1 = 0, U32 flags = DB_FREE_SPACE, SV *unused2 = 0, SV *callback = &PL_sv_undef) |
201 | flags: FREELIST_ONLY FREE_SPACE |
202 | flags: FREELIST_ONLY FREE_SPACE |
202 | db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
203 | db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
203 | db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef) |
204 | db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef) |
204 | db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
205 | db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
… | |
… | |
612 | |
613 | |
613 | =item BDB::set_sync_prepare $cb |
614 | =item BDB::set_sync_prepare $cb |
614 | |
615 | |
615 | Sets a callback that is called whenever a request is created without an |
616 | Sets a callback that is called whenever a request is created without an |
616 | explicit callback. It has to return two code references. The first is used |
617 | explicit callback. It has to return two code references. The first is used |
617 | as the request callback, and the second is called to wait until the first |
618 | as the request callback (it should save the return status), and the second |
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619 | is called to wait until the first callback has been called (it must set |
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620 | C<$!> to the return status). |
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621 | |
|
|
622 | This mechanism can be used to include BDB into other event mechanisms, |
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|
623 | such as L<AnyEvent::BDB> or L<Coro::BDB>. |
|
|
624 | |
618 | callback has been called. The default implementation works like this: |
625 | The default implementation works like this: |
619 | |
626 | |
620 | sub { |
627 | sub { |
621 | my $status; |
628 | my $status; |
622 | ( |
629 | ( |
623 | sub { $status = $! }, |
630 | sub { $status = $! }, |
624 | sub { BDB::poll while !defined $status; $! = $status }, |
631 | sub { BDB::poll while !defined $status; $! = $status }, |
625 | ) |
632 | ) |
626 | } |
633 | } |
|
|
634 | |
|
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635 | It simply blocks the process till the request has finished and then sets |
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636 | C<$!> to the return value. This means that if you don't use a callback, |
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637 | BDB will simply fall back to synchronous operations. |
627 | |
638 | |
628 | =back |
639 | =back |
629 | |
640 | |
630 | =head3 STATISTICAL INFORMATION |
641 | =head3 STATISTICAL INFORMATION |
631 | |
642 | |
… | |
… | |
722 | TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>, |
733 | TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>, |
723 | above. |
734 | above. |
724 | |
735 | |
725 | =head1 SEE ALSO |
736 | =head1 SEE ALSO |
726 | |
737 | |
727 | L<Coro::BDB>, L<IO::AIO>. |
738 | L<AnyEvent::BDB> (event loop integration), L<Coro::BDB> (more natural |
|
|
739 | syntax), L<IO::AIO> (nice to have). |
728 | |
740 | |
729 | =head1 AUTHOR |
741 | =head1 AUTHOR |
730 | |
742 | |
731 | Marc Lehmann <schmorp@schmorp.de> |
743 | Marc Lehmann <schmorp@schmorp.de> |
732 | http://home.schmorp.de/ |
744 | http://home.schmorp.de/ |