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Comparing BDB/BDB.pm (file contents):
Revision 1.10 by root, Mon Aug 13 12:01:45 2007 UTC vs.
Revision 1.15 by root, Thu Sep 13 21:34:00 2007 UTC

… …
7 use BDB; 7 use BDB;
8 8
9=head1 DESCRIPTION 9=head1 DESCRIPTION
10 10
11See the BerkeleyDB documentation (L<http://www.oracle.com/technology/documentation/berkeley-db/db/index.html>). 11See the BerkeleyDB documentation (L<http://www.oracle.com/technology/documentation/berkeley-db/db/index.html>).
12The BDB API is very similar to the C API (the translation ahs been very faithful). 12The BDB API is very similar to the C API (the translation has been very faithful).
13 13
14See also the example sections in the document below and possibly the eg/ 14See also the example sections in the document below and possibly the eg/
15subdirectory of the BDB distribution. Last not least see the IO::AIO 15subdirectory of the BDB distribution. Last not least see the IO::AIO
16documentation, as that module uses almost the same asynchronous request 16documentation, as that module uses almost the same asynchronous request
17model as this module. 17model as this module.
… …
72use strict 'vars'; 72use strict 'vars';
73 73
74use base 'Exporter'; 74use base 'Exporter';
75 75
76BEGIN { 76BEGIN {
77 our $VERSION = '0.6'; 77 our $VERSION = '1.1';
78 78
79 our @BDB_REQ = qw( 79 our @BDB_REQ = qw(
80 db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect 80 db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect
81 db_env_memp_sync db_env_memp_trickle 81 db_env_memp_sync db_env_memp_trickle
82 db_open db_close db_compact db_sync db_put db_get db_pget db_del db_key_range 82 db_open db_close db_compact db_sync db_put db_get db_pget db_del db_key_range
83 db_txn_commit db_txn_abort 83 db_txn_commit db_txn_abort db_txn_finish
84 db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del 84 db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del
85 db_sequence_open db_sequence_close 85 db_sequence_open db_sequence_close
86 db_sequence_get db_sequence_remove 86 db_sequence_get db_sequence_remove
87 ); 87 );
88 our @EXPORT = (@BDB_REQ, qw(dbreq_pri dbreq_nice db_env_create db_create)); 88 our @EXPORT = (@BDB_REQ, qw(dbreq_pri dbreq_nice db_env_create db_create));
… …
116 116
117The C<SV *> types are generic perl scalars (for input and output of data 117The C<SV *> types are generic perl scalars (for input and output of data
118values), and the C<SV *callback> is the optional callback function to call 118values), and the C<SV *callback> is the optional callback function to call
119when the request is completed. 119when the request is completed.
120 120
121The various C<DB_ENV> etc. arguments are handles return by db_env_create>, 121The various C<DB_ENV> etc. arguments are handles return by
122C<C<db_create>, C<txn_begin> and so on. If they have an appended _ornull> 122C<db_env_create>, C<db_create>, C<txn_begin> and so on. If they have an
123C<this means they are optional and you can pass C<undef> for them, 123appended C<_ornull> this means they are optional and you can pass C<undef>
124C<resulting a NULL pointer on the C level. 124for them, resulting a NULL pointer on the C level.
125 125
126=head3 BDB functions 126=head3 BDB functions
127 127
128Functions in the BDB namespace, exported by default: 128Functions in the BDB namespace, exported by default:
129 129
130 $env = db_env_create (U32 env_flags = 0) 130 $env = db_env_create (U32 env_flags = 0)
131 flags: RPCCLIENT
131 132
132 db_env_open (DB_ENV *env, octetstring db_home, U32 open_flags, int mode, SV *callback = &PL_sv_undef) 133 db_env_open (DB_ENV *env, octetstring db_home, U32 open_flags, int mode, SV *callback = &PL_sv_undef)
134 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
133 db_env_close (DB_ENV *env, U32 flags = 0, SV *callback = &PL_sv_undef) 135 db_env_close (DB_ENV *env, U32 flags = 0, SV *callback = &PL_sv_undef)
134 db_env_txn_checkpoint (DB_ENV *env, U32 kbyte = 0, U32 min = 0, U32 flags = 0, SV *callback = &PL_sv_undef) 136 db_env_txn_checkpoint (DB_ENV *env, U32 kbyte = 0, U32 min = 0, U32 flags = 0, SV *callback = &PL_sv_undef)
137 flags: FORCE
135 db_env_lock_detect (DB_ENV *env, U32 flags = 0, U32 atype = DB_LOCK_DEFAULT, SV *dummy = 0, SV *callback = &PL_sv_undef) 138 db_env_lock_detect (DB_ENV *env, U32 flags = 0, U32 atype = DB_LOCK_DEFAULT, SV *dummy = 0, SV *callback = &PL_sv_undef)
139 atype: LOCK_DEFAULT LOCK_EXPIRE LOCK_MAXLOCKS LOCK_MAXWRITE LOCK_MINLOCKS LOCK_MINWRITE LOCK_OLDEST LOCK_RANDOM LOCK_YOUNGEST
136 db_env_memp_sync (DB_ENV *env, SV *dummy = 0, SV *callback = &PL_sv_undef) 140 db_env_memp_sync (DB_ENV *env, SV *dummy = 0, SV *callback = &PL_sv_undef)
137 db_env_memp_trickle (DB_ENV *env, int percent, SV *dummy = 0, SV *callback = &PL_sv_undef) 141 db_env_memp_trickle (DB_ENV *env, int percent, SV *dummy = 0, SV *callback = &PL_sv_undef)
138 142
139 $db = db_create (DB_ENV *env = 0, U32 flags = 0) 143 $db = db_create (DB_ENV *env = 0, U32 flags = 0)
144 flags: XA_CREATE
140 145
141 db_open (DB *db, DB_TXN_ornull *txnid, octetstring file, octetstring database, int type, U32 flags, int mode, SV *callback = &PL_sv_undef) 146 db_open (DB *db, DB_TXN_ornull *txnid, octetstring file, octetstring database, int type, U32 flags, int mode, SV *callback = &PL_sv_undef)
147 flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE
142 db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) 148 db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef)
149 flags: DB_NOSYNC
143 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_unde 150 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)
151 flags: FREELIST_ONLY FREE_SPACE
144 db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) 152 db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef)
145 db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef) 153 db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef)
146 db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) 154 db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef)
155 flags: APPEND NODUPDATA NOOVERWRITE
147 db_get (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) 156 db_get (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef)
157 flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW
148 db_pget (DB *db, DB_TXN_ornull *txn, SV *key, SV *pkey, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) 158 db_pget (DB *db, DB_TXN_ornull *txn, SV *key, SV *pkey, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef)
159 flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW
149 db_del (DB *db, DB_TXN_ornull *txn, SV *key, U32 flags = 0, SV *callback = &PL_sv_undef) 160 db_del (DB *db, DB_TXN_ornull *txn, SV *key, U32 flags = 0, SV *callback = &PL_sv_undef)
150 db_txn_commit (DB_TXN *txn, U32 flags = 0, SV *callback = &PL_sv_undef) 161 db_txn_commit (DB_TXN *txn, U32 flags = 0, SV *callback = &PL_sv_undef)
162 flags: TXN_NOSYNC TXN_SYNC
151 db_txn_abort (DB_TXN *txn, SV *callback = &PL_sv_undef) 163 db_txn_abort (DB_TXN *txn, SV *callback = &PL_sv_undef)
164
152 db_c_close (DBC *dbc, SV *callback = &PL_sv_undef) 165 db_c_close (DBC *dbc, SV *callback = &PL_sv_undef)
153 db_c_count (DBC *dbc, SV *count, U32 flags = 0, SV *callback = &PL_sv_undef) 166 db_c_count (DBC *dbc, SV *count, U32 flags = 0, SV *callback = &PL_sv_undef)
154 db_c_put (DBC *dbc, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) 167 db_c_put (DBC *dbc, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef)
168 flags: AFTER BEFORE CURRENT KEYFIRST KEYLAST NODUPDATA
155 db_c_get (DBC *dbc, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) 169 db_c_get (DBC *dbc, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef)
170 flags: CURRENT FIRST GET_BOTH GET_BOTH_RANGE GET_RECNO JOIN_ITEM LAST NEXT NEXT_DUP NEXT_NODUP PREV PREV_DUP PREV_NODUP SET SET_RANGE SET_RECNO READ_UNCOMMITTED MULTIPLE MULTIPLE_KEY RMW
156 db_c_pget (DBC *dbc, SV *key, SV *pkey, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) 171 db_c_pget (DBC *dbc, SV *key, SV *pkey, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef)
157 db_c_del (DBC *dbc, U32 flags = 0, SV *callback = &PL_sv_undef) 172 db_c_del (DBC *dbc, U32 flags = 0, SV *callback = &PL_sv_undef)
158 173
159 db_sequence_open (DB_SEQUENCE *seq, DB_TXN_ornull *txnid, SV *key, U32 flags = 0, SV *callback = &PL_sv_undef) 174 db_sequence_open (DB_SEQUENCE *seq, DB_TXN_ornull *txnid, SV *key, U32 flags = 0, SV *callback = &PL_sv_undef)
175 flags: CREATE EXCL
160 db_sequence_close (DB_SEQUENCE *seq, U32 flags = 0, SV *callback = &PL_sv_undef) 176 db_sequence_close (DB_SEQUENCE *seq, U32 flags = 0, SV *callback = &PL_sv_undef)
161 db_sequence_get (DB_SEQUENCE *seq, DB_TXN_ornull *txnid, int delta, SV *seq_value, U32 flags = DB_TXN_NOSYNC, SV *callback = &PL_sv_undef) 177 db_sequence_get (DB_SEQUENCE *seq, DB_TXN_ornull *txnid, int delta, SV *seq_value, U32 flags = DB_TXN_NOSYNC, SV *callback = &PL_sv_undef)
178 flags: TXN_NOSYNC
162 db_sequence_remove (DB_SEQUENCE *seq, DB_TXN_ornull *txnid = 0, U32 flags = 0, SV *callback = &PL_sv_undef) 179 db_sequence_remove (DB_SEQUENCE *seq, DB_TXN_ornull *txnid = 0, U32 flags = 0, SV *callback = &PL_sv_undef)
180 flags: TXN_NOSYNC
163 181
182=head4 db_txn_finish (DB_TXN *txn, U32 flags = 0, SV *callback = &PL_sv_undef)
183
184This is not a Berkeley DB function but a BDB module extension. It is very
185annoying to have to check every single BDB function for error returns and
186provide a codepath out of your transaction. While the BDB module still
187makes this possible, it contains the following extensions:
188
189When a transaction-protected function returns any operating system
190error (errno > 0), BDB will set the C<TXN_DEADLOCK> flag on the
191transaction. This flag is also set by Berkeley DB functions externally
192when an operation fails with LOCK_DEADLOCK, and it causes all further
193operations on that transaction (including C<db_txn_commit>) to fail.
194
195The C<db_txn_finish> request will look at this flag, and, if it is set,
196will automatically call C<db_txn_abort> (setting errno to C<LOCK_DEADLOCK>
197if it isn't set). If it isn't set, it will call C<db_txn_commit> and
198return the error normally.
199
200How to use this? Easy: just write your transaction normally:
201
202 my $txn = $db_env->txn_begin;
203 db_get $db, $txn, "key", my $data;
204 db_put $db, $txn, "key", $data + 1 unless $! == BDB::NOTFOUND;
205 db_txn_finish $txn;
206 die "transaction failed" if $!;
207
208That is, handle only the expected errors. If something unexpected happens
209(EIO, LOCK_NOTGRANTED or a deadlock in either db_get or db_put), then the remaining
210requests (db_put in this case) will simply be skipped (they will fail with
211LOCK_DEADLOCK) and the transaction will be aborted.
212
213You cna use the C<< $txn->failed >> method to check wether a transaction
214has failed in this way and abort further processing (excluding
215C<db_txn_finish>).
164 216
165=head3 DB_ENV/database environment methods 217=head3 DB_ENV/database environment methods
166 218
167Methods available on DB_ENV/$env handles: 219Methods available on DB_ENV/$env handles:
168 220
… …
179 $int = $env->set_flags (U32 flags, int onoff) 231 $int = $env->set_flags (U32 flags, int onoff)
180 $env->set_errfile (FILE *errfile = 0) 232 $env->set_errfile (FILE *errfile = 0)
181 $env->set_msgfile (FILE *msgfile = 0) 233 $env->set_msgfile (FILE *msgfile = 0)
182 $int = $env->set_verbose (U32 which, int onoff = 1) 234 $int = $env->set_verbose (U32 which, int onoff = 1)
183 $int = $env->set_encrypt (const char *password, U32 flags = 0) 235 $int = $env->set_encrypt (const char *password, U32 flags = 0)
184 $int = $env->set_timeout (NV timeout, U32 flags) 236 $int = $env->set_timeout (NV timeout_seconds, U32 flags = SET_TXN_TIMEOUT)
185 $int = $env->set_mp_max_openfd (int maxopenfd); 237 $int = $env->set_mp_max_openfd (int maxopenfd);
186 $int = $env->set_mp_max_write (int maxwrite, int maxwrite_sleep); 238 $int = $env->set_mp_max_write (int maxwrite, int maxwrite_sleep);
187 $int = $env->set_mp_mmapsize (int mmapsize_mb) 239 $int = $env->set_mp_mmapsize (int mmapsize_mb)
188 $int = $env->set_lk_detect (U32 detect = DB_LOCK_DEFAULT) 240 $int = $env->set_lk_detect (U32 detect = DB_LOCK_DEFAULT)
189 $int = $env->set_lk_max_lockers (U32 max) 241 $int = $env->set_lk_max_lockers (U32 max)
… …
191 $int = $env->set_lk_max_objects (U32 max) 243 $int = $env->set_lk_max_objects (U32 max)
192 $int = $env->set_lg_bsize (U32 max) 244 $int = $env->set_lg_bsize (U32 max)
193 $int = $env->set_lg_max (U32 max) 245 $int = $env->set_lg_max (U32 max)
194 246
195 $txn = $env->txn_begin (DB_TXN_ornull *parent = 0, U32 flags = 0) 247 $txn = $env->txn_begin (DB_TXN_ornull *parent = 0, U32 flags = 0)
248 flags: READ_COMMITTED READ_UNCOMMITTED TXN_NOSYNC TXN_NOWAIT TXN_SNAPSHOT TXN_SYNC TXN_WAIT TXN_WRITE_NOSYNC
196 249
197=head4 example 250=head4 Example:
198 251
199 use AnyEvent; 252 use AnyEvent;
200 use BDB; 253 use BDB;
201 254
202 our $FH; open $FH, "<&=" . BDB::poll_fileno; 255 our $FH; open $FH, "<&=" . BDB::poll_fileno;
… …
229 SvREFCNT_dec (env); 282 SvREFCNT_dec (env);
230 } 283 }
231 284
232 $int = $db->set_cachesize (U32 gbytes, U32 bytes, int ncache = 0) 285 $int = $db->set_cachesize (U32 gbytes, U32 bytes, int ncache = 0)
233 $int = $db->set_flags (U32 flags) 286 $int = $db->set_flags (U32 flags)
287 flags: CHKSUM ENCRYPT TXN_NOT_DURABLE
288 Btree: DUP DUPSORT RECNUM REVSPLITOFF
289 Hash: DUP DUPSORT
290 Queue: INORDER
291 Recno: RENUMBER SNAPSHOT
292
234 $int = $db->set_encrypt (const char *password, U32 flags) 293 $int = $db->set_encrypt (const char *password, U32 flags)
235 $int = $db->set_lorder (int lorder) 294 $int = $db->set_lorder (int lorder)
236 $int = $db->set_bt_minkey (U32 minkey) 295 $int = $db->set_bt_minkey (U32 minkey)
237 $int = $db->set_re_delim (int delim) 296 $int = $db->set_re_delim (int delim)
238 $int = $db->set_re_pad (int re_pad) 297 $int = $db->set_re_pad (int re_pad)
… …
241 $int = $db->set_h_ffactor (U32 h_ffactor) 300 $int = $db->set_h_ffactor (U32 h_ffactor)
242 $int = $db->set_h_nelem (U32 h_nelem) 301 $int = $db->set_h_nelem (U32 h_nelem)
243 $int = $db->set_q_extentsize (U32 extentsize) 302 $int = $db->set_q_extentsize (U32 extentsize)
244 303
245 $dbc = $db->cursor (DB_TXN_ornull *txn = 0, U32 flags = 0) 304 $dbc = $db->cursor (DB_TXN_ornull *txn = 0, U32 flags = 0)
305 flags: READ_COMMITTED READ_UNCOMMITTED WRITECURSOR TXN_SNAPSHOT
246 $seq = $db->sequence (U32 flags = 0) 306 $seq = $db->sequence (U32 flags = 0)
247 307
248=head4 example 308=head4 Example:
249 309
250 my $db = db_create $env; 310 my $db = db_create $env;
251 db_open $db, undef, "table", undef, BDB::BTREE, BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0600; 311 db_open $db, undef, "table", undef, BDB::BTREE, BDB::AUTO_COMMIT | BDB::CREATE | BDB::READ_UNCOMMITTED, 0600;
252 312
253 for (1..1000) { 313 for (1..1000) {
… …
269 DESTROY (DB_TXN_ornull *txn) 329 DESTROY (DB_TXN_ornull *txn)
270 CODE: 330 CODE:
271 if (txn) 331 if (txn)
272 txn->abort (txn); 332 txn->abort (txn);
273 333
274 $int = $txn->set_timeout (NV timeout, U32 flags) 334 $int = $txn->set_timeout (NV timeout_seconds, U32 flags = SET_TXN_TIMEOUT)
335 flags: SET_LOCK_TIMEOUT SET_TXN_TIMEOUT
336
337 $bool = $txn->failed
338 # see db_txn_finish documentation, above
275 339
276 340
277=head3 DBC/cursor methods 341=head3 DBC/cursor methods
278 342
279Methods available on DBC/$dbc handles: 343Methods available on DBC/$dbc handles:
… …
281 DESTROY (DBC_ornull *dbc) 345 DESTROY (DBC_ornull *dbc)
282 CODE: 346 CODE:
283 if (dbc) 347 if (dbc)
284 dbc->c_close (dbc); 348 dbc->c_close (dbc);
285 349
286=head4 example 350=head4 Example:
287 351
288 my $c = $db->cursor; 352 my $c = $db->cursor;
289 353
290 for (;;) { 354 for (;;) {
291 db_c_get $c, my $key, my $data, BDB::NEXT; 355 db_c_get $c, my $key, my $data, BDB::NEXT;
… …
293 last if $!; 357 last if $!;
294 } 358 }
295 359
296 db_c_close $c; 360 db_c_close $c;
297 361
362
298=head3 DB_SEQUENCE/sequence methods 363=head3 DB_SEQUENCE/sequence methods
299 364
300Methods available on DB_SEQUENCE/$seq handles: 365Methods available on DB_SEQUENCE/$seq handles:
301 366
302 DESTROY (DB_SEQUENCE_ornull *seq) 367 DESTROY (DB_SEQUENCE_ornull *seq)
… …
305 seq->close (seq, 0); 370 seq->close (seq, 0);
306 371
307 $int = $seq->initial_value (db_seq_t value) 372 $int = $seq->initial_value (db_seq_t value)
308 $int = $seq->set_cachesize (U32 size) 373 $int = $seq->set_cachesize (U32 size)
309 $int = $seq->set_flags (U32 flags) 374 $int = $seq->set_flags (U32 flags)
375 flags: SEQ_DEC SEQ_INC SEQ_WRAP
310 $int = $seq->set_range (db_seq_t min, db_seq_t max) 376 $int = $seq->set_range (db_seq_t min, db_seq_t max)
311 377
312=head4 example 378=head4 Example:
313 379
314 my $seq = $db->sequence; 380 my $seq = $db->sequence;
315 381
316 db_sequence_open $seq, undef, "seq", BDB::CREATE; 382 db_sequence_open $seq, undef, "seq", BDB::CREATE;
317 db_sequence_get $seq, undef, 1, my $value; 383 db_sequence_get $seq, undef, 1, my $value;
… …
570bytes of memory. In addition, stat requests need a stat buffer (possibly 636bytes of memory. In addition, stat requests need a stat buffer (possibly
571a few hundred bytes), readdir requires a result buffer and so on. Perl 637a few hundred bytes), readdir requires a result buffer and so on. Perl
572scalars and other data passed into aio requests will also be locked and 638scalars and other data passed into aio requests will also be locked and
573will consume memory till the request has entered the done state. 639will consume memory till the request has entered the done state.
574 640
575This is now awfully much, so queuing lots of requests is not usually a 641This is not awfully much, so queuing lots of requests is not usually a
576problem. 642problem.
577 643
578Per-thread usage: 644Per-thread usage:
579 645
580In the execution phase, some aio requests require more memory for 646In the execution phase, some aio requests require more memory for
581temporary buffers, and each thread requires a stack and other data 647temporary buffers, and each thread requires a stack and other data
582structures (usually around 16k-128k, depending on the OS). 648structures (usually around 16k-128k, depending on the OS).
583 649
584=head1 KNOWN BUGS 650=head1 KNOWN BUGS
585 651
586Known bugs will be fixed in the next release. 652Known bugs will be fixed in the next release, except:
653
654 If you use a transaction in any request, and the request returns
655 with an operating system error or DB_LOCK_NOTGRANTED, the internal
656 TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>,
657 above.
587 658
588=head1 SEE ALSO 659=head1 SEE ALSO
589 660
590L<Coro::AIO>. 661L<Coro::AIO>.
591 662

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