… | |
… | |
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 | |
29 | # automatic result processing with AnyEvent: |
29 | # when you also use Coro, management is easy: |
30 | our $FH; open $FH, "<&=" . BDB::poll_fileno; |
30 | use Coro::BDB; |
31 | our $WATCHER = AnyEvent->io (fh => $FH, poll => 'r', cb => \&BDB::poll_cb); |
31 | |
|
|
32 | # automatic event loop intergration with AnyEvent: |
|
|
33 | use AnyEvent::BDB; |
32 | |
34 | |
33 | # automatic result processing with EV: |
35 | # automatic result processing with EV: |
34 | 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; |
35 | |
37 | |
36 | # with Glib: |
38 | # with Glib: |
… | |
… | |
106 | no warnings; |
108 | no warnings; |
107 | use strict 'vars'; |
109 | use strict 'vars'; |
108 | |
110 | |
109 | use base 'Exporter'; |
111 | use base 'Exporter'; |
110 | |
112 | |
|
|
113 | our $VERSION; |
|
|
114 | |
111 | BEGIN { |
115 | BEGIN { |
112 | our $VERSION = '1.4'; |
116 | $VERSION = '1.71'; |
113 | |
117 | |
114 | our @BDB_REQ = qw( |
118 | our @BDB_REQ = qw( |
115 | db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect |
119 | db_env_open db_env_close db_env_txn_checkpoint db_env_lock_detect |
116 | db_env_memp_sync db_env_memp_trickle |
120 | db_env_memp_sync db_env_memp_trickle db_env_dbrename db_env_dbremove |
117 | db_open db_close db_compact db_sync db_upgrade |
121 | db_open db_close db_compact db_sync db_upgrade |
118 | db_put db_get db_pget db_del db_key_range |
122 | db_put db_exists db_get db_pget db_del db_key_range |
119 | db_txn_commit db_txn_abort db_txn_finish |
123 | db_txn_commit db_txn_abort db_txn_finish |
120 | db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del |
124 | db_c_close db_c_count db_c_put db_c_get db_c_pget db_c_del |
121 | db_sequence_open db_sequence_close |
125 | db_sequence_open db_sequence_close |
122 | db_sequence_get db_sequence_remove |
126 | db_sequence_get db_sequence_remove |
123 | ); |
127 | ); |
… | |
… | |
131 | |
135 | |
132 | require XSLoader; |
136 | require XSLoader; |
133 | XSLoader::load ("BDB", $VERSION); |
137 | XSLoader::load ("BDB", $VERSION); |
134 | } |
138 | } |
135 | |
139 | |
|
|
140 | =head2 WIN32 FILENAMES/DATABASE NAME MESS |
|
|
141 | |
|
|
142 | Perl on Win32 supports only ASCII filenames (the reason is that it abuses |
|
|
143 | an internal flag to store wether a filename is Unicode or ANSI, but that |
|
|
144 | flag is used for somethign else in the perl core, so there is no way to |
|
|
145 | detect wether a filename is ANSI or Unicode-encoded). The BDB module |
|
|
146 | tries to work around this issue by assuming that the filename is an ANSI |
|
|
147 | filename and BDB was built for unicode support. |
|
|
148 | |
136 | =head2 BERKELEYDB FUNCTIONS |
149 | =head2 BERKELEYDB FUNCTIONS |
137 | |
150 | |
138 | All of these are functions. The create functions simply return a new |
151 | All of these are functions. The create functions simply return a new |
139 | object and never block. All the remaining functions all take an optional |
152 | object and never block. All the remaining functions take an optional |
140 | callback as last argument. If it is missing, then the function will be |
153 | callback as last argument. If it is missing, then the function will be |
141 | executed synchronously. In both cases, C<$!> will reflect the return value |
154 | executed synchronously. In both cases, C<$!> will reflect the return value |
142 | of the function. |
155 | of the function. |
143 | |
156 | |
144 | BDB functions that cannot block (mostly functions that manipulate |
157 | BDB functions that cannot block (mostly functions that manipulate |
145 | settings) are method calls on the relevant objects, so the rule of thumb |
158 | settings) are method calls on the relevant objects, so the rule of thumb |
146 | is: if its a method, its not blocking, if its a function, it takes a |
159 | is: if it's a method, it's not blocking, if it's a function, it takes a |
147 | callback as last argument. |
160 | callback as last argument. |
148 | |
161 | |
149 | In the following, C<$int> signifies an integer return value, |
162 | In the following, C<$int> signifies an integer return value, |
150 | C<octetstring> is a "binary string" (i.e. a perl string with no character |
163 | C<bdb_filename> is a "filename" (octets on unix, madness on windows), |
151 | indices >255), C<U32> is an unsigned 32 bit integer, C<int> is some |
164 | C<U32> is an unsigned 32 bit integer, C<int> is some integer, C<NV> is a |
152 | integer, C<NV> is a floating point value. |
165 | floating point value. |
153 | |
166 | |
154 | The C<SV *> types are generic perl scalars (for input and output of data |
167 | Most C<SV *> types are generic perl scalars (for input and output of data |
155 | values), and the C<SV *callback> is the optional callback function to call |
168 | values). |
156 | when the request is completed. |
|
|
157 | |
169 | |
158 | The various C<DB_ENV> etc. arguments are handles return by |
170 | The various C<DB_ENV> etc. arguments are handles return by |
159 | C<db_env_create>, C<db_create>, C<txn_begin> and so on. If they have an |
171 | C<db_env_create>, C<db_create>, C<txn_begin> and so on. If they have an |
160 | appended C<_ornull> this means they are optional and you can pass C<undef> |
172 | appended C<_ornull> this means they are optional and you can pass C<undef> |
161 | for them, resulting a NULL pointer on the C level. |
173 | for them, resulting a NULL pointer on the C level. |
162 | |
174 | |
|
|
175 | The C<SV *callback> is the optional callback function to call when the |
|
|
176 | request is completed. This last callback argument is special: the callback |
|
|
177 | is simply the last argument passed. If there are "optional" arguments |
|
|
178 | before the callback they can be left out. The callback itself can be left |
|
|
179 | out or specified as C<undef>, in which case the function will be executed |
|
|
180 | synchronously. |
|
|
181 | |
|
|
182 | For example, C<db_env_txn_checkpoint> usually is called with all integer |
|
|
183 | arguments zero. These can be left out, so all of these specify a call |
|
|
184 | to C<< DB_ENV->txn_checkpoint >>, to be executed asynchronously with a |
|
|
185 | callback to be called: |
|
|
186 | |
|
|
187 | db_env_txn_checkpoint $db_env, 0, 0, 0, sub { }; |
|
|
188 | db_env_txn_checkpoint $db_env, 0, 0, sub { }; |
|
|
189 | db_env_txn_checkpoint $db_env, sub { }; |
|
|
190 | |
|
|
191 | While these all specify a call to C<< DB_ENV->txn_checkpoint >> to be |
|
|
192 | executed synchronously: |
|
|
193 | |
|
|
194 | db_env_txn_checkpoint $db_env, 0, 0, 0, undef; |
|
|
195 | db_env_txn_checkpoint $db_env, 0, 0, 0; |
|
|
196 | db_env_txn_checkpoint $db_env, 0; |
|
|
197 | |
163 | =head3 BDB functions |
198 | =head3 BDB functions |
164 | |
199 | |
165 | Functions in the BDB namespace, exported by default: |
200 | Functions in the BDB namespace, exported by default: |
166 | |
201 | |
167 | $env = db_env_create (U32 env_flags = 0) |
202 | $env = db_env_create (U32 env_flags = 0) |
168 | flags: RPCCLIENT |
203 | flags: RPCCLIENT |
169 | |
204 | |
170 | db_env_open (DB_ENV *env, octetstring db_home, U32 open_flags, int mode, SV *callback = &PL_sv_undef) |
205 | db_env_open (DB_ENV *env, bdb_filename db_home, U32 open_flags, int mode, SV *callback = &PL_sv_undef) |
171 | 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 |
206 | 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 |
172 | db_env_close (DB_ENV *env, U32 flags = 0, SV *callback = &PL_sv_undef) |
207 | db_env_close (DB_ENV *env, U32 flags = 0, SV *callback = &PL_sv_undef) |
173 | db_env_txn_checkpoint (DB_ENV *env, U32 kbyte = 0, U32 min = 0, U32 flags = 0, SV *callback = &PL_sv_undef) |
208 | db_env_txn_checkpoint (DB_ENV *env, U32 kbyte = 0, U32 min = 0, U32 flags = 0, SV *callback = &PL_sv_undef) |
174 | flags: FORCE |
209 | flags: FORCE |
175 | db_env_lock_detect (DB_ENV *env, U32 flags = 0, U32 atype = DB_LOCK_DEFAULT, SV *dummy = 0, SV *callback = &PL_sv_undef) |
210 | db_env_lock_detect (DB_ENV *env, U32 flags = 0, U32 atype = DB_LOCK_DEFAULT, SV *dummy = 0, SV *callback = &PL_sv_undef) |
176 | atype: LOCK_DEFAULT LOCK_EXPIRE LOCK_MAXLOCKS LOCK_MAXWRITE LOCK_MINLOCKS LOCK_MINWRITE LOCK_OLDEST LOCK_RANDOM LOCK_YOUNGEST |
211 | atype: LOCK_DEFAULT LOCK_EXPIRE LOCK_MAXLOCKS LOCK_MAXWRITE LOCK_MINLOCKS LOCK_MINWRITE LOCK_OLDEST LOCK_RANDOM LOCK_YOUNGEST |
177 | db_env_memp_sync (DB_ENV *env, SV *dummy = 0, SV *callback = &PL_sv_undef) |
212 | db_env_memp_sync (DB_ENV *env, SV *dummy = 0, SV *callback = &PL_sv_undef) |
178 | db_env_memp_trickle (DB_ENV *env, int percent, SV *dummy = 0, SV *callback = &PL_sv_undef) |
213 | db_env_memp_trickle (DB_ENV *env, int percent, SV *dummy = 0, SV *callback = &PL_sv_undef) |
|
|
214 | db_env_dbremove (DB_ENV *env, DB_TXN_ornull *txnid, bdb_filename file, bdb_filename database, U32 flags = 0, SV *callback = &PL_sv_undef) |
|
|
215 | 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) |
179 | |
216 | |
180 | $db = db_create (DB_ENV *env = 0, U32 flags = 0) |
217 | $db = db_create (DB_ENV *env = 0, U32 flags = 0) |
181 | flags: XA_CREATE |
218 | flags: XA_CREATE |
182 | |
219 | |
183 | db_open (DB *db, DB_TXN_ornull *txnid, octetstring file, octetstring database, int type, U32 flags, int mode, SV *callback = &PL_sv_undef) |
220 | 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) |
184 | flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE |
221 | flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE |
185 | db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
222 | db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
186 | flags: DB_NOSYNC |
223 | flags: DB_NOSYNC |
187 | db_upgrade (DB *db, octetstring file, U32 flags = 0, SV *callback = &PL_sv_undef) |
224 | db_upgrade (DB *db, bdb_filename file, U32 flags = 0, SV *callback = &PL_sv_undef) |
188 | 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) |
225 | 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) |
189 | flags: FREELIST_ONLY FREE_SPACE |
226 | flags: FREELIST_ONLY FREE_SPACE |
190 | db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
227 | db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
191 | db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef) |
228 | db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef) |
192 | db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
229 | db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
193 | flags: APPEND NODUPDATA NOOVERWRITE |
230 | flags: APPEND NODUPDATA NOOVERWRITE |
|
|
231 | db_exists (DB *db, DB_TXN_ornull *txn, SV *key, U32 flags = 0, SV *callback = 0) (v4.6) |
194 | db_get (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
232 | db_get (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
195 | flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW |
233 | flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW |
196 | db_pget (DB *db, DB_TXN_ornull *txn, SV *key, SV *pkey, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
234 | db_pget (DB *db, DB_TXN_ornull *txn, SV *key, SV *pkey, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
197 | flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW |
235 | flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW |
198 | db_del (DB *db, DB_TXN_ornull *txn, SV *key, U32 flags = 0, SV *callback = &PL_sv_undef) |
236 | db_del (DB *db, DB_TXN_ornull *txn, SV *key, U32 flags = 0, SV *callback = &PL_sv_undef) |
… | |
… | |
265 | $int = $env->set_data_dir (const char *dir) |
303 | $int = $env->set_data_dir (const char *dir) |
266 | $int = $env->set_tmp_dir (const char *dir) |
304 | $int = $env->set_tmp_dir (const char *dir) |
267 | $int = $env->set_lg_dir (const char *dir) |
305 | $int = $env->set_lg_dir (const char *dir) |
268 | $int = $env->set_shm_key (long shm_key) |
306 | $int = $env->set_shm_key (long shm_key) |
269 | $int = $env->set_cachesize (U32 gbytes, U32 bytes, int ncache = 0) |
307 | $int = $env->set_cachesize (U32 gbytes, U32 bytes, int ncache = 0) |
270 | $int = $env->set_flags (U32 flags, int onoff) |
308 | $int = $env->set_flags (U32 flags, int onoff = 1) |
|
|
309 | $int = $env->log_set_config (U32 flags, int onoff = 1) (v4.7) |
|
|
310 | $int = $env->set_intermediate_dir_mode (const char *modestring) (v4.7) |
271 | $env->set_errfile (FILE *errfile = 0) |
311 | $env->set_errfile (FILE *errfile = 0) |
272 | $env->set_msgfile (FILE *msgfile = 0) |
312 | $env->set_msgfile (FILE *msgfile = 0) |
273 | $int = $env->set_verbose (U32 which, int onoff = 1) |
313 | $int = $env->set_verbose (U32 which, int onoff = 1) |
274 | $int = $env->set_encrypt (const char *password, U32 flags = 0) |
314 | $int = $env->set_encrypt (const char *password, U32 flags = 0) |
275 | $int = $env->set_timeout (NV timeout_seconds, U32 flags = SET_TXN_TIMEOUT) |
315 | $int = $env->set_timeout (NV timeout_seconds, U32 flags = SET_TXN_TIMEOUT) |
… | |
… | |
287 | $int = $env->mutex_set_max (U32 max) |
327 | $int = $env->mutex_set_max (U32 max) |
288 | $int = $env->mutex_set_align (U32 align) |
328 | $int = $env->mutex_set_align (U32 align) |
289 | |
329 | |
290 | $txn = $env->txn_begin (DB_TXN_ornull *parent = 0, U32 flags = 0) |
330 | $txn = $env->txn_begin (DB_TXN_ornull *parent = 0, U32 flags = 0) |
291 | flags: READ_COMMITTED READ_UNCOMMITTED TXN_NOSYNC TXN_NOWAIT TXN_SNAPSHOT TXN_SYNC TXN_WAIT TXN_WRITE_NOSYNC |
331 | flags: READ_COMMITTED READ_UNCOMMITTED TXN_NOSYNC TXN_NOWAIT TXN_SNAPSHOT TXN_SYNC TXN_WAIT TXN_WRITE_NOSYNC |
|
|
332 | $txn = $env->cdsgroup_begin; (v4.5) |
292 | |
333 | |
293 | =head4 Example: |
334 | =head4 Example: |
294 | |
335 | |
295 | use AnyEvent; |
336 | use AnyEvent; |
296 | use BDB; |
337 | use BDB; |
… | |
… | |
388 | DESTROY (DBC_ornull *dbc) |
429 | DESTROY (DBC_ornull *dbc) |
389 | CODE: |
430 | CODE: |
390 | if (dbc) |
431 | if (dbc) |
391 | dbc->c_close (dbc); |
432 | dbc->c_close (dbc); |
392 | |
433 | |
|
|
434 | $int = $cursor->set_priority ($priority = PRIORITY_*) (v4.6) |
|
|
435 | |
393 | =head4 Example: |
436 | =head4 Example: |
394 | |
437 | |
395 | my $c = $db->cursor; |
438 | my $c = $db->cursor; |
396 | |
439 | |
397 | for (;;) { |
440 | for (;;) { |
… | |
… | |
435 | =item $msg = BDB::strerror [$errno] |
478 | =item $msg = BDB::strerror [$errno] |
436 | |
479 | |
437 | Returns the string corresponding to the given errno value. If no argument |
480 | Returns the string corresponding to the given errno value. If no argument |
438 | is given, use C<$!>. |
481 | is given, use C<$!>. |
439 | |
482 | |
|
|
483 | Note that the BDB module also patches the C<$!> variable directly, so you |
|
|
484 | should be able to get a bdb error string by simply stringifying C<$!>. |
|
|
485 | |
440 | =item $fileno = BDB::poll_fileno |
486 | =item $fileno = BDB::poll_fileno |
441 | |
487 | |
442 | Return the I<request result pipe file descriptor>. This filehandle must be |
488 | Return the I<request result pipe file descriptor>. This filehandle must be |
443 | polled for reading by some mechanism outside this module (e.g. Event or |
489 | polled for reading by some mechanism outside this module (e.g. Event or |
444 | select, see below or the SYNOPSIS). If the pipe becomes readable you have |
490 | select, see below or the SYNOPSIS). If the pipe becomes readable you have |
… | |
… | |
520 | BDB::poll_wait, BDB::poll_cb |
566 | BDB::poll_wait, BDB::poll_cb |
521 | while BDB::nreqs; |
567 | while BDB::nreqs; |
522 | |
568 | |
523 | =back |
569 | =back |
524 | |
570 | |
|
|
571 | =head3 VERSION CHECKING |
|
|
572 | |
|
|
573 | BerkeleyDB comes in various versions, many of them have minor |
|
|
574 | incompatibilities. This means that traditional "at least version x.x" |
|
|
575 | checks are often not sufficient. |
|
|
576 | |
|
|
577 | Example: set the log_autoremove option in a way compatible with <v4.7 and |
|
|
578 | v4.7. Note the use of & on the constants to avoid triggering a compiletime |
|
|
579 | bug when the symbol isn't available. |
|
|
580 | |
|
|
581 | $DB_ENV->set_flags (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7; |
|
|
582 | $DB_ENV->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7; |
|
|
583 | |
|
|
584 | =over 4 |
|
|
585 | |
|
|
586 | =item BDB::VERSION |
|
|
587 | |
|
|
588 | The C<BDB::VERSION> function, when called without arguments, returns the |
|
|
589 | Berkeley DB version as a v-string (usually with 3 components). You should |
|
|
590 | use C<lt> and C<ge> operators exclusively to make comparisons. |
|
|
591 | |
|
|
592 | Example: check for at least version 4.7. |
|
|
593 | |
|
|
594 | BDB::VERSION ge v4.7 or die; |
|
|
595 | |
|
|
596 | =item BDB::VERSION min-version |
|
|
597 | |
|
|
598 | Returns true if the BDB version is at least the given version (specified |
|
|
599 | as a v-string), false otherwise. |
|
|
600 | |
|
|
601 | Example: check for at least version 4.5. |
|
|
602 | |
|
|
603 | BDB::VERSION v4.7 or die; |
|
|
604 | |
|
|
605 | =item BDB::VERSION min-version, max-version |
|
|
606 | |
|
|
607 | Returns true of the BDB version is at least version C<min-version> (specify C<undef> or C<v0> for any minimum version) |
|
|
608 | and less then C<max-version>. |
|
|
609 | |
|
|
610 | Example: check wether version is strictly less then v4.7. |
|
|
611 | |
|
|
612 | BDB::VERSION v0, v4.7 |
|
|
613 | or die "version 4.7 is not yet supported"; |
|
|
614 | |
|
|
615 | =back |
|
|
616 | |
|
|
617 | =cut |
|
|
618 | |
|
|
619 | sub VERSION { |
|
|
620 | # I was dumb enough to override the VERSION method here, so let's try |
|
|
621 | # to fix it up. |
|
|
622 | |
|
|
623 | if ($_[0] eq __PACKAGE__) { |
|
|
624 | $VERSION |
|
|
625 | } else { |
|
|
626 | if (@_ > 0) { |
|
|
627 | return undef if VERSION_v lt $_[0]; |
|
|
628 | if (@_ > 1) { |
|
|
629 | return undef if VERSION_v ge $_[1]; |
|
|
630 | } |
|
|
631 | } |
|
|
632 | |
|
|
633 | VERSION_v |
|
|
634 | } |
|
|
635 | } |
|
|
636 | |
525 | =head3 CONTROLLING THE NUMBER OF THREADS |
637 | =head3 CONTROLLING THE NUMBER OF THREADS |
526 | |
638 | |
527 | =over 4 |
639 | =over 4 |
528 | |
640 | |
529 | =item BDB::min_parallel $nthreads |
641 | =item BDB::min_parallel $nthreads |
… | |
… | |
595 | |
707 | |
596 | =item BDB::set_sync_prepare $cb |
708 | =item BDB::set_sync_prepare $cb |
597 | |
709 | |
598 | Sets a callback that is called whenever a request is created without an |
710 | Sets a callback that is called whenever a request is created without an |
599 | explicit callback. It has to return two code references. The first is used |
711 | explicit callback. It has to return two code references. The first is used |
600 | as the request callback, and the second is called to wait until the first |
712 | as the request callback (it should save the return status), and the second |
|
|
713 | is called to wait until the first callback has been called (it must set |
|
|
714 | C<$!> to the return status). |
|
|
715 | |
|
|
716 | This mechanism can be used to include BDB into other event mechanisms, |
|
|
717 | such as L<AnyEvent::BDB> or L<Coro::BDB>. |
|
|
718 | |
601 | callback has been called. The default implementation works like this: |
719 | The default implementation works like this: |
602 | |
720 | |
603 | sub { |
721 | sub { |
604 | my $status; |
722 | my $status; |
605 | ( |
723 | ( |
606 | sub { $status = $! }, |
724 | sub { $status = $! }, |
607 | sub { BDB::poll while !defined $status; $! = $status }, |
725 | sub { BDB::poll while !defined $status; $! = $status }, |
608 | ) |
726 | ) |
609 | } |
727 | } |
|
|
728 | |
|
|
729 | It simply blocks the process till the request has finished and then sets |
|
|
730 | C<$!> to the return value. This means that if you don't use a callback, |
|
|
731 | BDB will simply fall back to synchronous operations. |
610 | |
732 | |
611 | =back |
733 | =back |
612 | |
734 | |
613 | =head3 STATISTICAL INFORMATION |
735 | =head3 STATISTICAL INFORMATION |
614 | |
736 | |
… | |
… | |
705 | TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>, |
827 | TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>, |
706 | above. |
828 | above. |
707 | |
829 | |
708 | =head1 SEE ALSO |
830 | =head1 SEE ALSO |
709 | |
831 | |
710 | L<Coro::BDB>, L<IO::AIO>. |
832 | L<AnyEvent::BDB> (event loop integration), L<Coro::BDB> (more natural |
|
|
833 | syntax), L<IO::AIO> (nice to have). |
711 | |
834 | |
712 | =head1 AUTHOR |
835 | =head1 AUTHOR |
713 | |
836 | |
714 | Marc Lehmann <schmorp@schmorp.de> |
837 | Marc Lehmann <schmorp@schmorp.de> |
715 | http://home.schmorp.de/ |
838 | http://home.schmorp.de/ |