[ViewVC] Diff of: cvs/BDB/BDB.pm

Comparing BDB/BDB.pm (file contents):
Revision 1.22 by root, Mon Dec 10 03:57:27 2007 UTC vs.
Revision 1.39 by root, Tue Jul 8 08:25:31 2008 UTC

…		…
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:
…		…
107	use strict 'vars';	109	use strict 'vars';
108		110
109	use base 'Exporter';	111	use base 'Exporter';
110		112
111	BEGIN {	113	BEGIN {
112	our $VERSION = '1.3';	114	our $VERSION = '1.6';
113		115
114	our @BDB_REQ = qw(	116	our @BDB_REQ = qw(
115	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
116	db_env_memp_sync db_env_memp_trickle	118	db_env_memp_sync db_env_memp_trickle db_env_dbrename db_env_dbremove
117	db_open db_close db_compact db_sync db_put db_get db_pget db_del db_key_range	119	db_open db_close db_compact db_sync db_upgrade
		120	db_put db_get db_pget db_del db_key_range
118	db_txn_commit db_txn_abort db_txn_finish	121	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	122	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	123	db_sequence_open db_sequence_close
121	db_sequence_get db_sequence_remove	124	db_sequence_get db_sequence_remove
122	);	125	);
…		…
130		133
131	require XSLoader;	134	require XSLoader;
132	XSLoader::load ("BDB", $VERSION);	135	XSLoader::load ("BDB", $VERSION);
133	}	136	}
134		137
		138	=head2 WIN32 FILENAMES/DATABASE NAME MESS
		139
		140	Perl on Win32 supports only ASCII filenames (the reason is that it abuses
		141	an internal flag to store wether a filename is Unicode or ANSI, but that
		142	flag is used for somethign else in the perl core, so there is no way to
		143	detect wether a filename is ANSI or Unicode-encoded). The BDB module
		144	tries to work around this issue by assuming that the filename is an ANSI
		145	filename and BDB was built for unicode support.
		146
135	=head2 BERKELEYDB FUNCTIONS	147	=head2 BERKELEYDB FUNCTIONS
136		148
137	All of these are functions. The create functions simply return a new	149	All of these are functions. The create functions simply return a new
138	object and never block. All the remaining functions all take an optional	150	object and never block. All the remaining functions take an optional
139	callback as last argument that gets passed the return value. If it is	151	callback as last argument. If it is missing, then the function will be
140	missing, then the function will be executed synchronously, and the return	152	executed synchronously. In both cases, C<$!> will reflect the return value
141	value is returned as normally.	153	of the function.
142		154
143	BDB functions that cannot block (mostly functions that manipulate	155	BDB functions that cannot block (mostly functions that manipulate
144	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
145	is: if its a method, its not blocking, if its a function, it takes a	157	is: if it's a method, it's not blocking, if it's a function, it takes a
146	callback as last argument.	158	callback as last argument.
147		159
148	In the following, C<$int> signifies an integer return value,	160	In the following, C<$int> signifies an integer return value,
149	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),
150	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
151	integer, C<NV> is a floating point value.	163	floating point value.
152		164
153	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
154	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
155	when the request is completed.	167	when the request is completed.
156		168
…		…
164	Functions in the BDB namespace, exported by default:	176	Functions in the BDB namespace, exported by default:
165		177
166	$env = db_env_create (U32 env_flags = 0)	178	$env = db_env_create (U32 env_flags = 0)
167	flags: RPCCLIENT	179	flags: RPCCLIENT
168		180
169	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)
170	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
171	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)
172	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)
173	flags: FORCE	185	flags: FORCE
174	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)
175	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
176	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)
177	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)
		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)
		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)
178		192
179	$db = db_create (DB_ENV *env = 0, U32 flags = 0)	193	$db = db_create (DB_ENV *env = 0, U32 flags = 0)
180	flags: XA_CREATE	194	flags: XA_CREATE
181		195
182	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)
183	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
184	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)
185	flags: DB_NOSYNC	199	flags: DB_NOSYNC
		200	db_upgrade (DB db, bdb_filename file, U32 flags = 0, SV callback = &PL_sv_undef)
186	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)
187	flags: FREELIST_ONLY FREE_SPACE	202	flags: FREELIST_ONLY FREE_SPACE
188	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)
189	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)
190	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)
…		…
263	$int = $env->set_data_dir (const char *dir)	278	$int = $env->set_data_dir (const char *dir)
264	$int = $env->set_tmp_dir (const char *dir)	279	$int = $env->set_tmp_dir (const char *dir)
265	$int = $env->set_lg_dir (const char *dir)	280	$int = $env->set_lg_dir (const char *dir)
266	$int = $env->set_shm_key (long shm_key)	281	$int = $env->set_shm_key (long shm_key)
267	$int = $env->set_cachesize (U32 gbytes, U32 bytes, int ncache = 0)	282	$int = $env->set_cachesize (U32 gbytes, U32 bytes, int ncache = 0)
268	$int = $env->set_flags (U32 flags, int onoff)	283	$int = $env->set_flags (U32 flags, int onoff = 1)
		284	$int = $env->log_set_config (U32 flags, int onoff = 1) [v4.7]
		285	$int = $env->set_intermediate_dir_mode (const char *modestring) [v4.7]
269	$env->set_errfile (FILE *errfile = 0)	286	$env->set_errfile (FILE *errfile = 0)
270	$env->set_msgfile (FILE *msgfile = 0)	287	$env->set_msgfile (FILE *msgfile = 0)
271	$int = $env->set_verbose (U32 which, int onoff = 1)	288	$int = $env->set_verbose (U32 which, int onoff = 1)
272	$int = $env->set_encrypt (const char *password, U32 flags = 0)	289	$int = $env->set_encrypt (const char *password, U32 flags = 0)
273	$int = $env->set_timeout (NV timeout_seconds, U32 flags = SET_TXN_TIMEOUT)	290	$int = $env->set_timeout (NV timeout_seconds, U32 flags = SET_TXN_TIMEOUT)
…		…
386	DESTROY (DBC_ornull *dbc)	403	DESTROY (DBC_ornull *dbc)
387	CODE:	404	CODE:
388	if (dbc)	405	if (dbc)
389	dbc->c_close (dbc);	406	dbc->c_close (dbc);
390		407
		408	$int = $cursor->set_priority ($priority = PRIORITY_*)
		409
391	=head4 Example:	410	=head4 Example:
392		411
393	my $c = $db->cursor;	412	my $c = $db->cursor;
394		413
395	for (;;) {	414	for (;;) {
…		…
428		447
429	=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION	448	=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION
430		449
431	=over 4	450	=over 4
432		451
		452	=item $msg = BDB::strerror [$errno]
		453
		454	Returns the string corresponding to the given errno value. If no argument
		455	is given, use C<$!>.
		456
		457	Note that the BDB module also patches the C<$!> variable directly, so you
		458	should be able to get a bdb error string by simply stringifying C<$!>.
		459
433	=item $fileno = BDB::poll_fileno	460	=item $fileno = BDB::poll_fileno
434		461
435	Return the I<request result pipe file descriptor>. This filehandle must be	462	Return the I<request result pipe file descriptor>. This filehandle must be
436	polled for reading by some mechanism outside this module (e.g. Event or	463	polled for reading by some mechanism outside this module (e.g. Event or
437	select, see below or the SYNOPSIS). If the pipe becomes readable you have	464	select, see below or the SYNOPSIS). If the pipe becomes readable you have
…		…
513	BDB::poll_wait, BDB::poll_cb	540	BDB::poll_wait, BDB::poll_cb
514	while BDB::nreqs;	541	while BDB::nreqs;
515		542
516	=back	543	=back
517		544
		545	=head3 VERSION CHECKING
		546
		547	BerkeleyDB comes in various versions, many of them have minor
		548	incompatibilities. This means that traditional "at least version x.x"
		549	checks are often not sufficient.
		550
		551	=over 4
		552
		553	=item BDB::VERSION
		554
		555	The C<BDB::VERSION> function, when called without arguments, returns the
		556	Berkeley DB version as a v-string (usually with 3 components). You should
		557	use C<lt> and C<ge> operators exclusively to make comparisons.
		558
		559	Example: check for at least version 4.7.
		560
		561	BDB::VERSION ge v4.7 or die;
		562
		563	=item BDB::VERSION min-version
		564
		565	Returns true if the BDB version is at least the given version (specified
		566	as a v-string), false otherwise.
		567
		568	Example: check for at least version 4.5.
		569
		570	BDB::VERSION v4.7 or die;
		571
		572	=item BDB::VERSION min-version, max-version
		573
		574	Returns true of the BDB version is at least version C<min-version> (specify C<undef> or C<v0> for any minimum version)
		575	and less then C<max-version>.
		576
		577	Example: check wether version is strictly less then v4.7.
		578
		579	BDB::VERSION v0, v4.7
		580	or die "version 4.7 is not yet supported";
		581
		582	=back
		583
		584	=cut
		585
		586	sub VERSION {
		587	if (@_ > 0) {
		588	return undef if VERSION_v lt $_[0];
		589	if (@_ > 1) {
		590	return undef if VERSION_v ge $_[1];
		591	}
		592	}
		593
		594	VERSION_v
		595	}
		596
518	=head3 CONTROLLING THE NUMBER OF THREADS	597	=head3 CONTROLLING THE NUMBER OF THREADS
519		598
520	=over 4	599	=over 4
521		600
522	=item BDB::min_parallel $nthreads	601	=item BDB::min_parallel $nthreads
…		…
588		667
589	=item BDB::set_sync_prepare $cb	668	=item BDB::set_sync_prepare $cb
590		669
591	Sets a callback that is called whenever a request is created without an	670	Sets a callback that is called whenever a request is created without an
592	explicit callback. It has to return two code references. The first is used	671	explicit callback. It has to return two code references. The first is used
593	as the request callback, and the second is called to wait until the first	672	as the request callback (it should save the return status), and the second
		673	is called to wait until the first callback has been called (it must set
		674	C<$!> to the return status).
		675
		676	This mechanism can be used to include BDB into other event mechanisms,
		677	such as L<AnyEvent::BDB> or L<Coro::BDB>.
		678
594	callback has been called. The default implementation works like this:	679	The default implementation works like this:
595		680
596	sub {	681	sub {
597	my $status;	682	my $status;
598	(	683	(
599	sub { $status = $! },	684	sub { $status = $! },
600	sub { BDB::poll while !defined $status; $! = $status },	685	sub { BDB::poll while !defined $status; $! = $status },
601	)	686	)
602	}	687	}
		688
		689	It simply blocks the process till the request has finished and then sets
		690	C<$!> to the return value. This means that if you don't use a callback,
		691	BDB will simply fall back to synchronous operations.
603		692
604	=back	693	=back
605		694
606	=head3 STATISTICAL INFORMATION	695	=head3 STATISTICAL INFORMATION
607		696
…		…
664		753
665	In short: the parent will, after a short pause, continue as if fork had	754	In short: the parent will, after a short pause, continue as if fork had
666	not been called, while the child will act as if BDB has not been used	755	not been called, while the child will act as if BDB has not been used
667	yet.	756	yet.
668		757
		758	Win32 note: there is no fork on win32, and perls emulation of it is too
		759	broken to be supported, so do not use BDB in a windows pseudo-fork, better
		760	yet, switch to a more capable platform.
		761
669	=head2 MEMORY USAGE	762	=head2 MEMORY USAGE
670		763
671	Per-request usage:	764	Per-request usage:
672		765
673	Each aio request uses - depending on your architecture - around 100-200	766	Each aio request uses - depending on your architecture - around 100-200
…		…
694	TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>,	787	TXN_DEADLOCK flag will be set on the transaction. See C<db_txn_finish>,
695	above.	788	above.
696		789
697	=head1 SEE ALSO	790	=head1 SEE ALSO
698		791
699	L<Coro::BDB>, L<IO::AIO>.	792	L<AnyEvent::BDB> (event loop integration), L<Coro::BDB> (more natural
		793	syntax), L<IO::AIO> (nice to have).
700		794
701	=head1 AUTHOR	795	=head1 AUTHOR
702		796
703	Marc Lehmann <schmorp@schmorp.de>	797	Marc Lehmann <schmorp@schmorp.de>
704	http://home.schmorp.de/	798	http://home.schmorp.de/

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Comparing BDB/BDB.pm (file contents): Revision 1.22 by root, Mon Dec 10 03:57:27 2007 UTC vs. Revision 1.39 by root, Tue Jul 8 08:25:31 2008 UTC

Diff Legend

Comparing BDB/BDB.pm (file contents):
Revision 1.22 by root, Mon Dec 10 03:57:27 2007 UTC vs.
Revision 1.39 by root, Tue Jul 8 08:25:31 2008 UTC