… | |
… | |
22 | db_put $db, undef, "key", "data", 0, sub { |
22 | db_put $db, undef, "key", "data", 0, sub { |
23 | db_del $db, undef, "key"; |
23 | db_del $db, undef, "key"; |
24 | }; |
24 | }; |
25 | db_sync $db; |
25 | db_sync $db; |
26 | |
26 | |
27 | # automatic result processing with AnyEvent: |
27 | # when you also use Coro, management is easy: |
28 | our $FH; open $FH, "<&=" . BDB::poll_fileno; |
28 | use Coro::BDB; |
29 | our $WATCHER = AnyEvent->io (fh => $FH, poll => 'r', cb => \&BDB::poll_cb); |
29 | |
|
|
30 | # automatic event loop intergration with AnyEvent: |
|
|
31 | use AnyEvent::BDB; |
30 | |
32 | |
31 | # automatic result processing with EV: |
33 | # automatic result processing with EV: |
32 | my $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb; |
34 | my $WATCHER = EV::io BDB::poll_fileno, EV::READ, \&BDB::poll_cb; |
33 | |
35 | |
34 | # with Glib: |
36 | # with Glib: |
… | |
… | |
84 | Request has reached the end of its lifetime and holds no resources |
86 | Request has reached the end of its lifetime and holds no resources |
85 | anymore (except possibly for the Perl object, but its connection to |
87 | anymore (except possibly for the Perl object, but its connection to |
86 | the actual aio request is severed and calling its methods will |
88 | the actual aio request is severed and calling its methods will |
87 | either do nothing or result in a runtime error). |
89 | either do nothing or result in a runtime error). |
88 | |
90 | |
|
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91 | WIN32 FILENAMES/DATABASE NAME MESS |
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92 | Perl on Win32 supports only ASCII filenames (the reason is that it |
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93 | abuses an internal flag to store wether a filename is Unicode or ANSI, |
|
|
94 | but that flag is used for somethign else in the perl core, so there is |
|
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95 | no way to detect wether a filename is ANSI or Unicode-encoded). The BDB |
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96 | module tries to work around this issue by assuming that the filename is |
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97 | an ANSI filename and BDB was built for unicode support. |
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98 | |
89 | BERKELEYDB FUNCTIONS |
99 | BERKELEYDB FUNCTIONS |
90 | All of these are functions. The create functions simply return a new |
100 | All of these are functions. The create functions simply return a new |
91 | object and never block. All the remaining functions all take an optional |
101 | object and never block. All the remaining functions take an optional |
92 | callback as last argument. If it is missing, then the function will be |
102 | callback as last argument. If it is missing, then the function will be |
93 | executed synchronously. In both cases, $! will reflect the return value |
103 | executed synchronously. In both cases, $! will reflect the return value |
94 | of the function. |
104 | of the function. |
95 | |
105 | |
96 | BDB functions that cannot block (mostly functions that manipulate |
106 | BDB functions that cannot block (mostly functions that manipulate |
97 | settings) are method calls on the relevant objects, so the rule of thumb |
107 | settings) are method calls on the relevant objects, so the rule of thumb |
98 | is: if its a method, its not blocking, if its a function, it takes a |
108 | is: if it's a method, it's not blocking, if it's a function, it takes a |
99 | callback as last argument. |
109 | callback as last argument. |
100 | |
110 | |
101 | In the following, $int signifies an integer return value, "octetstring" |
111 | In the following, $int signifies an integer return value, "bdb_filename" |
102 | is a "binary string" (i.e. a perl string with no character indices |
112 | is a "filename" (octets on unix, madness on windows), "U32" is an |
103 | >255), "U32" is an unsigned 32 bit integer, "int" is some integer, "NV" |
113 | unsigned 32 bit integer, "int" is some integer, "NV" is a floating point |
104 | is a floating point value. |
114 | value. |
105 | |
115 | |
106 | The "SV *" types are generic perl scalars (for input and output of data |
116 | Most "SV *" types are generic perl scalars (for input and output of data |
107 | values), and the "SV *callback" is the optional callback function to |
117 | values). |
108 | call when the request is completed. |
|
|
109 | |
118 | |
110 | The various "DB_ENV" etc. arguments are handles return by |
119 | The various "DB_ENV" etc. arguments are handles return by |
111 | "db_env_create", "db_create", "txn_begin" and so on. If they have an |
120 | "db_env_create", "db_create", "txn_begin" and so on. If they have an |
112 | appended "_ornull" this means they are optional and you can pass "undef" |
121 | appended "_ornull" this means they are optional and you can pass "undef" |
113 | for them, resulting a NULL pointer on the C level. |
122 | for them, resulting a NULL pointer on the C level. |
114 | |
123 | |
|
|
124 | The "SV *callback" is the optional callback function to call when the |
|
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125 | request is completed. This last callback argument is special: the |
|
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126 | callback is simply the last argument passed. If there are "optional" |
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127 | arguments before the callback they can be left out. The callback itself |
|
|
128 | can be left out or specified as "undef", in which case the function will |
|
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129 | be executed synchronously. |
|
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130 | |
|
|
131 | For example, "db_env_txn_checkpoint" usually is called with all integer |
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132 | arguments zero. These can be left out, so all of these specify a call to |
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133 | "DB_ENV->txn_checkpoint", to be executed asynchronously with a callback |
|
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134 | to be called: |
|
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135 | |
|
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136 | db_env_txn_checkpoint $db_env, 0, 0, 0, sub { }; |
|
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137 | db_env_txn_checkpoint $db_env, 0, 0, sub { }; |
|
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138 | db_env_txn_checkpoint $db_env, sub { }; |
|
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139 | |
|
|
140 | While these all specify a call to "DB_ENV->txn_checkpoint" to be |
|
|
141 | executed synchronously: |
|
|
142 | |
|
|
143 | db_env_txn_checkpoint $db_env, 0, 0, 0, undef; |
|
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144 | db_env_txn_checkpoint $db_env, 0, 0, 0; |
|
|
145 | db_env_txn_checkpoint $db_env, 0; |
|
|
146 | |
115 | BDB functions |
147 | BDB functions |
116 | Functions in the BDB namespace, exported by default: |
148 | Functions in the BDB namespace, exported by default: |
117 | |
149 | |
118 | $env = db_env_create (U32 env_flags = 0) |
150 | $env = db_env_create (U32 env_flags = 0) |
119 | flags: RPCCLIENT |
151 | flags: RPCCLIENT |
120 | |
152 | |
121 | db_env_open (DB_ENV *env, octetstring db_home, U32 open_flags, int mode, SV *callback = &PL_sv_undef) |
153 | db_env_open (DB_ENV *env, bdb_filename db_home, U32 open_flags, int mode, SV *callback = &PL_sv_undef) |
122 | 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 |
154 | 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 |
123 | db_env_close (DB_ENV *env, U32 flags = 0, SV *callback = &PL_sv_undef) |
155 | db_env_close (DB_ENV *env, U32 flags = 0, SV *callback = &PL_sv_undef) |
124 | db_env_txn_checkpoint (DB_ENV *env, U32 kbyte = 0, U32 min = 0, U32 flags = 0, SV *callback = &PL_sv_undef) |
156 | db_env_txn_checkpoint (DB_ENV *env, U32 kbyte = 0, U32 min = 0, U32 flags = 0, SV *callback = &PL_sv_undef) |
125 | flags: FORCE |
157 | flags: FORCE |
126 | db_env_lock_detect (DB_ENV *env, U32 flags = 0, U32 atype = DB_LOCK_DEFAULT, SV *dummy = 0, SV *callback = &PL_sv_undef) |
158 | db_env_lock_detect (DB_ENV *env, U32 flags = 0, U32 atype = DB_LOCK_DEFAULT, SV *dummy = 0, SV *callback = &PL_sv_undef) |
127 | atype: LOCK_DEFAULT LOCK_EXPIRE LOCK_MAXLOCKS LOCK_MAXWRITE LOCK_MINLOCKS LOCK_MINWRITE LOCK_OLDEST LOCK_RANDOM LOCK_YOUNGEST |
159 | atype: LOCK_DEFAULT LOCK_EXPIRE LOCK_MAXLOCKS LOCK_MAXWRITE LOCK_MINLOCKS LOCK_MINWRITE LOCK_OLDEST LOCK_RANDOM LOCK_YOUNGEST |
128 | db_env_memp_sync (DB_ENV *env, SV *dummy = 0, SV *callback = &PL_sv_undef) |
160 | db_env_memp_sync (DB_ENV *env, SV *dummy = 0, SV *callback = &PL_sv_undef) |
129 | db_env_memp_trickle (DB_ENV *env, int percent, SV *dummy = 0, SV *callback = &PL_sv_undef) |
161 | db_env_memp_trickle (DB_ENV *env, int percent, SV *dummy = 0, SV *callback = &PL_sv_undef) |
|
|
162 | db_env_dbremove (DB_ENV *env, DB_TXN_ornull *txnid, bdb_filename file, bdb_filename database, U32 flags = 0, SV *callback = &PL_sv_undef) |
|
|
163 | 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) |
130 | |
164 | |
131 | $db = db_create (DB_ENV *env = 0, U32 flags = 0) |
165 | $db = db_create (DB_ENV *env = 0, U32 flags = 0) |
132 | flags: XA_CREATE |
166 | flags: XA_CREATE |
133 | |
167 | |
134 | db_open (DB *db, DB_TXN_ornull *txnid, octetstring file, octetstring database, int type, U32 flags, int mode, SV *callback = &PL_sv_undef) |
168 | 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) |
135 | flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE |
169 | flags: AUTO_COMMIT CREATE EXCL MULTIVERSION NOMMAP RDONLY READ_UNCOMMITTED THREAD TRUNCATE |
136 | db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
170 | db_close (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
137 | flags: DB_NOSYNC |
171 | flags: DB_NOSYNC |
138 | db_upgrade (DB *db, octetstring file, U32 flags = 0, SV *callback = &PL_sv_undef) |
172 | db_upgrade (DB *db, bdb_filename file, U32 flags = 0, SV *callback = &PL_sv_undef) |
139 | 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) |
173 | 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) |
140 | flags: FREELIST_ONLY FREE_SPACE |
174 | flags: FREELIST_ONLY FREE_SPACE |
141 | db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
175 | db_sync (DB *db, U32 flags = 0, SV *callback = &PL_sv_undef) |
142 | db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef) |
176 | db_key_range (DB *db, DB_TXN_ornull *txn, SV *key, SV *key_range, U32 flags = 0, SV *callback = &PL_sv_undef) |
143 | db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
177 | db_put (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
144 | flags: APPEND NODUPDATA NOOVERWRITE |
178 | flags: APPEND NODUPDATA NOOVERWRITE |
|
|
179 | db_exists (DB *db, DB_TXN_ornull *txn, SV *key, U32 flags = 0, SV *callback = 0) (v4.6) |
145 | db_get (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
180 | db_get (DB *db, DB_TXN_ornull *txn, SV *key, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
146 | flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW |
181 | flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW |
147 | db_pget (DB *db, DB_TXN_ornull *txn, SV *key, SV *pkey, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
182 | db_pget (DB *db, DB_TXN_ornull *txn, SV *key, SV *pkey, SV *data, U32 flags = 0, SV *callback = &PL_sv_undef) |
148 | flags: CONSUME CONSUME_WAIT GET_BOTH SET_RECNO MULTIPLE READ_COMMITTED READ_UNCOMMITTED RMW |
183 | 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) |
184 | db_del (DB *db, DB_TXN_ornull *txn, SV *key, U32 flags = 0, SV *callback = &PL_sv_undef) |
… | |
… | |
214 | $int = $env->set_data_dir (const char *dir) |
249 | $int = $env->set_data_dir (const char *dir) |
215 | $int = $env->set_tmp_dir (const char *dir) |
250 | $int = $env->set_tmp_dir (const char *dir) |
216 | $int = $env->set_lg_dir (const char *dir) |
251 | $int = $env->set_lg_dir (const char *dir) |
217 | $int = $env->set_shm_key (long shm_key) |
252 | $int = $env->set_shm_key (long shm_key) |
218 | $int = $env->set_cachesize (U32 gbytes, U32 bytes, int ncache = 0) |
253 | $int = $env->set_cachesize (U32 gbytes, U32 bytes, int ncache = 0) |
219 | $int = $env->set_flags (U32 flags, int onoff) |
254 | $int = $env->set_flags (U32 flags, int onoff = 1) |
|
|
255 | $int = $env->log_set_config (U32 flags, int onoff = 1) (v4.7) |
|
|
256 | $int = $env->set_intermediate_dir_mode (const char *modestring) (v4.7) |
220 | $env->set_errfile (FILE *errfile = 0) |
257 | $env->set_errfile (FILE *errfile = 0) |
221 | $env->set_msgfile (FILE *msgfile = 0) |
258 | $env->set_msgfile (FILE *msgfile = 0) |
222 | $int = $env->set_verbose (U32 which, int onoff = 1) |
259 | $int = $env->set_verbose (U32 which, int onoff = 1) |
223 | $int = $env->set_encrypt (const char *password, U32 flags = 0) |
260 | $int = $env->set_encrypt (const char *password, U32 flags = 0) |
224 | $int = $env->set_timeout (NV timeout_seconds, U32 flags = SET_TXN_TIMEOUT) |
261 | $int = $env->set_timeout (NV timeout_seconds, U32 flags = SET_TXN_TIMEOUT) |
… | |
… | |
236 | $int = $env->mutex_set_max (U32 max) |
273 | $int = $env->mutex_set_max (U32 max) |
237 | $int = $env->mutex_set_align (U32 align) |
274 | $int = $env->mutex_set_align (U32 align) |
238 | |
275 | |
239 | $txn = $env->txn_begin (DB_TXN_ornull *parent = 0, U32 flags = 0) |
276 | $txn = $env->txn_begin (DB_TXN_ornull *parent = 0, U32 flags = 0) |
240 | flags: READ_COMMITTED READ_UNCOMMITTED TXN_NOSYNC TXN_NOWAIT TXN_SNAPSHOT TXN_SYNC TXN_WAIT TXN_WRITE_NOSYNC |
277 | flags: READ_COMMITTED READ_UNCOMMITTED TXN_NOSYNC TXN_NOWAIT TXN_SNAPSHOT TXN_SYNC TXN_WAIT TXN_WRITE_NOSYNC |
|
|
278 | $txn = $env->cdsgroup_begin; (v4.5) |
241 | |
279 | |
242 | Example: |
280 | Example: |
243 | use AnyEvent; |
281 | use AnyEvent; |
244 | use BDB; |
282 | use BDB; |
245 | |
283 | |
… | |
… | |
329 | DESTROY (DBC_ornull *dbc) |
367 | DESTROY (DBC_ornull *dbc) |
330 | CODE: |
368 | CODE: |
331 | if (dbc) |
369 | if (dbc) |
332 | dbc->c_close (dbc); |
370 | dbc->c_close (dbc); |
333 | |
371 | |
|
|
372 | $int = $cursor->set_priority ($priority = PRIORITY_*) (v4.6) |
|
|
373 | |
334 | Example: |
374 | Example: |
335 | my $c = $db->cursor; |
375 | my $c = $db->cursor; |
336 | |
376 | |
337 | for (;;) { |
377 | for (;;) { |
338 | db_c_get $c, my $key, my $data, BDB::NEXT; |
378 | db_c_get $c, my $key, my $data, BDB::NEXT; |
… | |
… | |
356 | flags: SEQ_DEC SEQ_INC SEQ_WRAP |
396 | flags: SEQ_DEC SEQ_INC SEQ_WRAP |
357 | $int = $seq->set_range (db_seq_t min, db_seq_t max) |
397 | $int = $seq->set_range (db_seq_t min, db_seq_t max) |
358 | |
398 | |
359 | Example: |
399 | Example: |
360 | my $seq = $db->sequence; |
400 | my $seq = $db->sequence; |
361 | |
401 | |
362 | db_sequence_open $seq, undef, "seq", BDB::CREATE; |
402 | db_sequence_open $seq, undef, "seq", BDB::CREATE; |
363 | db_sequence_get $seq, undef, 1, my $value; |
403 | db_sequence_get $seq, undef, 1, my $value; |
364 | |
404 | |
365 | SUPPORT FUNCTIONS |
405 | SUPPORT FUNCTIONS |
366 | EVENT PROCESSING AND EVENT LOOP INTEGRATION |
406 | EVENT PROCESSING AND EVENT LOOP INTEGRATION |
367 | $msg = BDB::strerror [$errno] |
407 | $msg = BDB::strerror [$errno] |
368 | Returns the string corresponding to the given errno value. If no |
408 | Returns the string corresponding to the given errno value. If no |
369 | argument is given, use $!. |
409 | argument is given, use $!. |
|
|
410 | |
|
|
411 | Note that the BDB module also patches the $! variable directly, so |
|
|
412 | you should be able to get a bdb error string by simply stringifying |
|
|
413 | $!. |
370 | |
414 | |
371 | $fileno = BDB::poll_fileno |
415 | $fileno = BDB::poll_fileno |
372 | Return the *request result pipe file descriptor*. This filehandle |
416 | Return the *request result pipe file descriptor*. This filehandle |
373 | must be polled for reading by some mechanism outside this module |
417 | must be polled for reading by some mechanism outside this module |
374 | (e.g. Event or select, see below or the SYNOPSIS). If the pipe |
418 | (e.g. Event or select, see below or the SYNOPSIS). If the pipe |
… | |
… | |
444 | Strictly equivalent to: |
488 | Strictly equivalent to: |
445 | |
489 | |
446 | BDB::poll_wait, BDB::poll_cb |
490 | BDB::poll_wait, BDB::poll_cb |
447 | while BDB::nreqs; |
491 | while BDB::nreqs; |
448 | |
492 | |
|
|
493 | VERSION CHECKING |
|
|
494 | BerkeleyDB comes in various versions, many of them have minor |
|
|
495 | incompatibilities. This means that traditional "at least version x.x" |
|
|
496 | checks are often not sufficient. |
|
|
497 | |
|
|
498 | Example: set the log_autoremove option in a way compatible with <v.47 |
|
|
499 | and v4.7. Note the use of & on the constants to avoid triggering a |
|
|
500 | compiletime bug when the symbol isn't available. |
|
|
501 | |
|
|
502 | $DB_ENV->set_flags (&BDB::LOG_AUTOREMOVE ) if BDB::VERSION v0, v4.7; |
|
|
503 | $DB_ENV->log_set_config (&BDB::LOG_AUTO_REMOVE) if BDB::VERSION v4.7; |
|
|
504 | |
|
|
505 | BDB::VERSION |
|
|
506 | The "BDB::VERSION" function, when called without arguments, returns |
|
|
507 | the Berkeley DB version as a v-string (usually with 3 components). |
|
|
508 | You should use "lt" and "ge" operators exclusively to make |
|
|
509 | comparisons. |
|
|
510 | |
|
|
511 | Example: check for at least version 4.7. |
|
|
512 | |
|
|
513 | BDB::VERSION ge v4.7 or die; |
|
|
514 | |
|
|
515 | BDB::VERSION min-version |
|
|
516 | Returns true if the BDB version is at least the given version |
|
|
517 | (specified as a v-string), false otherwise. |
|
|
518 | |
|
|
519 | Example: check for at least version 4.5. |
|
|
520 | |
|
|
521 | BDB::VERSION v4.7 or die; |
|
|
522 | |
|
|
523 | BDB::VERSION min-version, max-version |
|
|
524 | Returns true of the BDB version is at least version "min-version" |
|
|
525 | (specify "undef" or "v0" for any minimum version) and less then |
|
|
526 | "max-version". |
|
|
527 | |
|
|
528 | Example: check wether version is strictly less then v4.7. |
|
|
529 | |
|
|
530 | BDB::VERSION v0, v4.7 |
|
|
531 | or die "version 4.7 is not yet supported"; |
|
|
532 | |
449 | CONTROLLING THE NUMBER OF THREADS |
533 | CONTROLLING THE NUMBER OF THREADS |
450 | BDB::min_parallel $nthreads |
534 | BDB::min_parallel $nthreads |
451 | Set the minimum number of BDB threads to $nthreads. The current |
535 | Set the minimum number of BDB threads to $nthreads. The current |
452 | default is 8, which means eight asynchronous operations can execute |
536 | default is 8, which means eight asynchronous operations can execute |
453 | concurrently at any one time (the number of outstanding requests, |
537 | concurrently at any one time (the number of outstanding requests, |
… | |
… | |
516 | (with large values). |
600 | (with large values). |
517 | |
601 | |
518 | BDB::set_sync_prepare $cb |
602 | BDB::set_sync_prepare $cb |
519 | Sets a callback that is called whenever a request is created without |
603 | Sets a callback that is called whenever a request is created without |
520 | an explicit callback. It has to return two code references. The |
604 | an explicit callback. It has to return two code references. The |
521 | first is used as the request callback, and the second is called to |
605 | first is used as the request callback (it should save the return |
522 | wait until the first callback has been called. The default |
606 | status), and the second is called to wait until the first callback |
|
|
607 | has been called (it must set $! to the return status). |
|
|
608 | |
|
|
609 | This mechanism can be used to include BDB into other event |
|
|
610 | mechanisms, such as AnyEvent::BDB or Coro::BDB. |
|
|
611 | |
523 | implementation works like this: |
612 | The default implementation works like this: |
524 | |
613 | |
525 | sub { |
614 | sub { |
526 | my $status; |
615 | my $status; |
527 | ( |
616 | ( |
528 | sub { $status = $! }, |
617 | sub { $status = $! }, |
529 | sub { BDB::poll while !defined $status; $! = $status }, |
618 | sub { BDB::poll while !defined $status; $! = $status }, |
530 | ) |
619 | ) |
531 | } |
620 | } |
532 | |
621 | |
|
|
622 | It simply blocks the process till the request has finished and then |
|
|
623 | sets $! to the return value. This means that if you don't use a |
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|
624 | callback, BDB will simply fall back to synchronous operations. |
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625 | |
533 | STATISTICAL INFORMATION |
626 | STATISTICAL INFORMATION |
534 | BDB::nreqs |
627 | BDB::nreqs |
535 | Returns the number of requests currently in the ready, execute or |
628 | Returns the number of requests currently in the ready, execute or |
536 | pending states (i.e. for which their callback has not been invoked |
629 | pending states (i.e. for which their callback has not been invoked |
537 | yet). |
630 | yet). |
… | |
… | |
593 | with an operating system error or DB_LOCK_NOTGRANTED, the internal |
686 | with an operating system error or DB_LOCK_NOTGRANTED, the internal |
594 | TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>, |
687 | TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>, |
595 | above. |
688 | above. |
596 | |
689 | |
597 | SEE ALSO |
690 | SEE ALSO |
598 | Coro::BDB, IO::AIO. |
691 | AnyEvent::BDB (event loop integration), Coro::BDB (more natural syntax), |
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|
692 | IO::AIO (nice to have). |
599 | |
693 | |
600 | AUTHOR |
694 | AUTHOR |
601 | Marc Lehmann <schmorp@schmorp.de> |
695 | Marc Lehmann <schmorp@schmorp.de> |
602 | http://home.schmorp.de/ |
696 | http://home.schmorp.de/ |
603 | |
697 | |