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24 | db_put $db, undef, "key", "data", 0, sub { |
24 | db_put $db, undef, "key", "data", 0, sub { |
25 | db_del $db, undef, "key"; |
25 | db_del $db, undef, "key"; |
26 | }; |
26 | }; |
27 | db_sync $db; |
27 | db_sync $db; |
28 | |
28 | |
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29 | # when you also use Coro, management is easy: |
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30 | use Coro::BDB; |
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31 | |
29 | # automatic result processing with AnyEvent: |
32 | # automatic result processing with AnyEvent: |
30 | our $FH; open $FH, "<&=" . BDB::poll_fileno; |
33 | our $FH; open $FH, "<&=" . BDB::poll_fileno; |
31 | our $WATCHER = AnyEvent->io (fh => $FH, poll => 'r', cb => \&BDB::poll_cb); |
34 | our $WATCHER = AnyEvent->io (fh => $FH, poll => 'r', cb => \&BDB::poll_cb); |
32 | |
35 | |
33 | # automatic result processing with EV: |
36 | # automatic result processing with EV: |
… | |
… | |
107 | use strict 'vars'; |
110 | use strict 'vars'; |
108 | |
111 | |
109 | use base 'Exporter'; |
112 | use base 'Exporter'; |
110 | |
113 | |
111 | BEGIN { |
114 | BEGIN { |
112 | our $VERSION = '1.2'; |
115 | our $VERSION = '1.45'; |
113 | |
116 | |
114 | our @BDB_REQ = qw( |
117 | our @BDB_REQ = qw( |
115 | db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect |
118 | db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect |
116 | db_env_memp_sync db_env_memp_trickle |
119 | db_env_memp_sync db_env_memp_trickle |
117 | db_open db_close db_compact db_sync db_put db_get db_pget db_del db_key_range |
120 | db_open db_close db_compact db_sync db_upgrade |
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121 | db_put db_get db_pget db_del db_key_range |
118 | db_txn_commit db_txn_abort db_txn_finish |
122 | db_txn_commit db_txn_abort db_txn_finish |
119 | db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del |
123 | db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del |
120 | db_sequence_open db_sequence_close |
124 | db_sequence_open db_sequence_close |
121 | db_sequence_get db_sequence_remove |
125 | db_sequence_get db_sequence_remove |
122 | ); |
126 | ); |
… | |
… | |
130 | |
134 | |
131 | require XSLoader; |
135 | require XSLoader; |
132 | XSLoader::load ("BDB", $VERSION); |
136 | XSLoader::load ("BDB", $VERSION); |
133 | } |
137 | } |
134 | |
138 | |
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139 | =head2 WIN32 FILENAMES/DATABASE NAME MESS |
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140 | |
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141 | Perl on Win32 supports only ASCII filenames (the reason is that it abuses |
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142 | an internal flag to store wether a filename is Unicode or ANSI, but that |
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143 | flag is used for somethign else in the perl core, so there is no way to |
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144 | detect wether a filename is ANSI or Unicode-encoded). The BDB module |
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145 | tries to work around this issue by assuming that the filename is an ANSI |
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146 | filename and BDB was built for unicode support. |
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147 | |
135 | =head2 BERKELEYDB FUNCTIONS |
148 | =head2 BERKELEYDB FUNCTIONS |
136 | |
149 | |
137 | All of these are functions. The create functions simply return a new |
150 | All of these are functions. The create functions simply return a new |
138 | object and never block. All the remaining functions all take an optional |
151 | object and never block. All the remaining functions take an optional |
139 | callback as last argument. If it is missing, then the fucntion will be |
152 | callback as last argument. If it is missing, then the function will be |
140 | executed synchronously. |
153 | executed synchronously. In both cases, C<$!> will reflect the return value |
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154 | of the function. |
141 | |
155 | |
142 | BDB functions that cannot block (mostly functions that manipulate |
156 | BDB functions that cannot block (mostly functions that manipulate |
143 | settings) are method calls on the relevant objects, so the rule of thumb |
157 | settings) are method calls on the relevant objects, so the rule of thumb |
144 | is: if its a method, its not blocking, if its a function, it takes a |
158 | is: if it's a method, it's not blocking, if it's a function, it takes a |
145 | callback as last argument. |
159 | callback as last argument. |
146 | |
160 | |
147 | In the following, C<$int> signifies an integer return value, |
161 | In the following, C<$int> signifies an integer return value, |
148 | C<octetstring> is a "binary string" (i.e. a perl string with no character |
162 | C<octetstring> is a "binary string" (i.e. a perl string with no character |
149 | indices >255), C<U32> is an unsigned 32 bit integer, C<int> is some |
163 | indices >255), C<U32> is an unsigned 32 bit integer, C<int> is some |
… | |
… | |
180 | |
194 | |
181 | db_open (DB *db, DB_TXN_ornull *txnid, octetstring file, octetstring database, int type, U32 flags, int mode, SV *callback = &PL_sv_undef) |
195 | db_open (DB *db, DB_TXN_ornull *txnid, octetstring file, octetstring database, int type, U32 flags, int mode, SV *callback = &PL_sv_undef) |
182 | flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE |
196 | flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE |
183 | db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
197 | db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
184 | flags: DB_NOSYNC |
198 | flags: DB_NOSYNC |
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199 | db_upgrade (DB *db, octetstring file, U32 flags = 0, SV *callback = &PL_sv_undef) |
185 | 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) |
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) |
186 | flags: FREELIST_ONLY FREE_SPACE |
201 | flags: FREELIST_ONLY FREE_SPACE |
187 | db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
202 | db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
188 | db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, 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) |
189 | db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, 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) |
… | |
… | |
385 | DESTROY (DBC_ornull *dbc) |
400 | DESTROY (DBC_ornull *dbc) |
386 | CODE: |
401 | CODE: |
387 | if (dbc) |
402 | if (dbc) |
388 | dbc->c_close (dbc); |
403 | dbc->c_close (dbc); |
389 | |
404 | |
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405 | $int = $cursor->set_priority ($priority = PRIORITY_*) |
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406 | |
390 | =head4 Example: |
407 | =head4 Example: |
391 | |
408 | |
392 | my $c = $db->cursor; |
409 | my $c = $db->cursor; |
393 | |
410 | |
394 | for (;;) { |
411 | for (;;) { |
… | |
… | |
426 | =head2 SUPPORT FUNCTIONS |
443 | =head2 SUPPORT FUNCTIONS |
427 | |
444 | |
428 | =head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION |
445 | =head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION |
429 | |
446 | |
430 | =over 4 |
447 | =over 4 |
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448 | |
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449 | =item $msg = BDB::strerror [$errno] |
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450 | |
|
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451 | Returns the string corresponding to the given errno value. If no argument |
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452 | is given, use C<$!>. |
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453 | |
|
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454 | Note that the BDB module also patches the C<$!> variable directly, so you |
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455 | should be able to get a bdb error string by simply stringifying C<$!>. |
431 | |
456 | |
432 | =item $fileno = BDB::poll_fileno |
457 | =item $fileno = BDB::poll_fileno |
433 | |
458 | |
434 | Return the I<request result pipe file descriptor>. This filehandle must be |
459 | Return the I<request result pipe file descriptor>. This filehandle must be |
435 | polled for reading by some mechanism outside this module (e.g. Event or |
460 | polled for reading by some mechanism outside this module (e.g. Event or |
… | |
… | |
663 | |
688 | |
664 | In short: the parent will, after a short pause, continue as if fork had |
689 | In short: the parent will, after a short pause, continue as if fork had |
665 | not been called, while the child will act as if BDB has not been used |
690 | not been called, while the child will act as if BDB has not been used |
666 | yet. |
691 | yet. |
667 | |
692 | |
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693 | Win32 note: there is no fork on win32, and perls emulation of it is too |
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694 | broken to be supported, so do not use BDB in a windows pseudo-fork, better |
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695 | yet, switch to a more capable platform. |
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696 | |
668 | =head2 MEMORY USAGE |
697 | =head2 MEMORY USAGE |
669 | |
698 | |
670 | Per-request usage: |
699 | Per-request usage: |
671 | |
700 | |
672 | Each aio request uses - depending on your architecture - around 100-200 |
701 | Each aio request uses - depending on your architecture - around 100-200 |