[ViewVC] Diff of: cvs/IO-AIO/AIO.pm

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.38 by root, Sun Aug 28 10:51:33 2005 UTC vs.
Revision 1.42 by root, Mon Dec 26 18:15:23 2005 UTC

…		…
14	aio_unlink "/tmp/file", sub { };	14	aio_unlink "/tmp/file", sub { };
15		15
16	aio_read $fh, 30000, 1024, $buffer, 0, sub {	16	aio_read $fh, 30000, 1024, $buffer, 0, sub {
17	$_[0] > 0 or die "read error: $!";	17	$_[0] > 0 or die "read error: $!";
18	};	18	};
		19
		20	# AnyEvent
		21	open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!";
		22	my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb });
19		23
20	# Event	24	# Event
21	Event->io (fd => IO::AIO::poll_fileno,	25	Event->io (fd => IO::AIO::poll_fileno,
22	poll => 'r',	26	poll => 'r',
23	cb => \&IO::AIO::poll_cb);	27	cb => \&IO::AIO::poll_cb);
…		…
63	use base 'Exporter';	67	use base 'Exporter';
64		68
65	use Fcntl ();	69	use Fcntl ();
66		70
67	BEGIN {	71	BEGIN {
68	$VERSION = 1.6;	72	$VERSION = '1.61';
69		73
70	@EXPORT = qw(aio_sendfile aio_read aio_write aio_open aio_close stat	74	@EXPORT = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat
71	aio_aio_lstat aio_unlink aio_rmdir aio_readdir aio_symlink	75	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink
72	aio_fsync aio_fdatasync aio_readahead);	76	aio_fsync aio_fdatasync aio_readahead);
73	@EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel	77	@EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel
74	max_outstanding nreqs);	78	max_outstanding nreqs);
75		79
76	require XSLoader;	80	require XSLoader;
…		…
105	environment, d) use Glib::filename_from_unicode on unicode filenames or e)	109	environment, d) use Glib::filename_from_unicode on unicode filenames or e)
106	use something else.	110	use something else.
107		111
108	=over 4	112	=over 4
109		113
110	=item aio_open $pathname, $flags, $mode, $callback	114	=item aio_open $pathname, $flags, $mode, $callback->($fh)
111		115
112	Asynchronously open or create a file and call the callback with a newly	116	Asynchronously open or create a file and call the callback with a newly
113	created filehandle for the file.	117	created filehandle for the file.
114		118
115	The pathname passed to C<aio_open> must be absolute. See API NOTES, above,	119	The pathname passed to C<aio_open> must be absolute. See API NOTES, above,
…		…
132	} else {	136	} else {
133	die "open failed: $!\n";	137	die "open failed: $!\n";
134	}	138	}
135	};	139	};
136		140
137	=item aio_close $fh, $callback	141	=item aio_close $fh, $callback->($status)
138		142
139	Asynchronously close a file and call the callback with the result	143	Asynchronously close a file and call the callback with the result
140	code. I<WARNING:> although accepted, you should not pass in a perl	144	code. I<WARNING:> although accepted, you should not pass in a perl
141	filehandle here, as perl will likely close the file descriptor another	145	filehandle here, as perl will likely close the file descriptor another
142	time when the filehandle is destroyed. Normally, you can safely call perls	146	time when the filehandle is destroyed. Normally, you can safely call perls
143	C<close> or just let filehandles go out of scope.	147	C<close> or just let filehandles go out of scope.
144		148
145	This is supposed to be a bug in the API, so that might change. It's	149	This is supposed to be a bug in the API, so that might change. It's
146	therefore best to avoid this function.	150	therefore best to avoid this function.
147		151
148	=item aio_read $fh,$offset,$length, $data,$dataoffset,$callback	152	=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
149		153
150	=item aio_write $fh,$offset,$length, $data,$dataoffset,$callback	154	=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
151		155
152	Reads or writes C<length> bytes from the specified C<fh> and C<offset>	156	Reads or writes C<length> bytes from the specified C<fh> and C<offset>
153	into the scalar given by C<data> and offset C<dataoffset> and calls the	157	into the scalar given by C<data> and offset C<dataoffset> and calls the
154	callback without the actual number of bytes read (or -1 on error, just	158	callback without the actual number of bytes read (or -1 on error, just
155	like the syscall).	159	like the syscall).
…		…
164	aio_read $fh, 7, 15, $buffer, 0, sub {	168	aio_read $fh, 7, 15, $buffer, 0, sub {
165	$_[0] > 0 or die "read error: $!";	169	$_[0] > 0 or die "read error: $!";
166	print "read $_[0] bytes: <$buffer>\n";	170	print "read $_[0] bytes: <$buffer>\n";
167	};	171	};
168		172
169	=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback	173	=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)
170		174
171	Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts	175	Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts
172	reading at byte offset C<$in_offset>, and starts writing at the current	176	reading at byte offset C<$in_offset>, and starts writing at the current
173	file offset of C<$out_fh>. Because of that, it is not safe to issue more	177	file offset of C<$out_fh>. Because of that, it is not safe to issue more
174	than one C<aio_sendfile> per C<$out_fh>, as they will interfere with each	178	than one C<aio_sendfile> per C<$out_fh>, as they will interfere with each
…		…
187	bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only	191	bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only
188	provides the number of bytes written to C<$out_fh>. Only if the result	192	provides the number of bytes written to C<$out_fh>. Only if the result
189	value equals C<$length> one can assume that C<$length> bytes have been	193	value equals C<$length> one can assume that C<$length> bytes have been
190	read.	194	read.
191		195
192	=item aio_readahead $fh,$offset,$length, $callback	196	=item aio_readahead $fh,$offset,$length, $callback->($retval)
193		197
194	C<aio_readahead> populates the page cache with data from a file so that	198	C<aio_readahead> populates the page cache with data from a file so that
195	subsequent reads from that file will not block on disk I/O. The C<$offset>	199	subsequent reads from that file will not block on disk I/O. The C<$offset>
196	argument specifies the starting point from which data is to be read and	200	argument specifies the starting point from which data is to be read and
197	C<$length> specifies the number of bytes to be read. I/O is performed in	201	C<$length> specifies the number of bytes to be read. I/O is performed in
…		…
201	file. The current file offset of the file is left unchanged.	205	file. The current file offset of the file is left unchanged.
202		206
203	If that syscall doesn't exist (likely if your OS isn't Linux) it will be	207	If that syscall doesn't exist (likely if your OS isn't Linux) it will be
204	emulated by simply reading the data, which would have a similar effect.	208	emulated by simply reading the data, which would have a similar effect.
205		209
206	=item aio_stat $fh_or_path, $callback	210	=item aio_stat $fh_or_path, $callback->($status)
207		211
208	=item aio_lstat $fh, $callback	212	=item aio_lstat $fh, $callback->($status)
209		213
210	Works like perl's C<stat> or C<lstat> in void context. The callback will	214	Works like perl's C<stat> or C<lstat> in void context. The callback will
211	be called after the stat and the results will be available using C<stat _>	215	be called after the stat and the results will be available using C<stat _>
212	or C<-s _> etc...	216	or C<-s _> etc...
213		217
…		…
223	aio_stat "/etc/passwd", sub {	227	aio_stat "/etc/passwd", sub {
224	$_[0] and die "stat failed: $!";	228	$_[0] and die "stat failed: $!";
225	print "size is ", -s _, "\n";	229	print "size is ", -s _, "\n";
226	};	230	};
227		231
228	=item aio_unlink $pathname, $callback	232	=item aio_unlink $pathname, $callback->($status)
229		233
230	Asynchronously unlink (delete) a file and call the callback with the	234	Asynchronously unlink (delete) a file and call the callback with the
231	result code.	235	result code.
232		236
233	=item aio_rmdir $pathname, $callback	237	=item aio_rmdir $pathname, $callback->($status)
234		238
235	Asynchronously rmdir (delete) a directory and call the callback with the	239	Asynchronously rmdir (delete) a directory and call the callback with the
236	result code.	240	result code.
237		241
238	=item aio_readdir $pathname $callback	242	=item aio_readdir $pathname $callback->($entries)
239		243
240	Unlike the POSIX call of the same name, C<aio_readdir> reads an entire	244	Unlike the POSIX call of the same name, C<aio_readdir> reads an entire
241	directory (i.e. opendir + readdir + closedir). The entries will not be	245	directory (i.e. opendir + readdir + closedir). The entries will not be
242	sorted, and will B<NOT> include the C<.> and C<..> entries.	246	sorted, and will B<NOT> include the C<.> and C<..> entries.
243		247
244	The callback a single argument which is either C<undef> or an array-ref	248	The callback a single argument which is either C<undef> or an array-ref
245	with the filenames.	249	with the filenames.
246		250
		251	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
		252
		253	Scans a directory (similar to C<aio_readdir>) and tries to separate the
		254	entries of directory C<$path> into two sets of names, ones you can recurse
		255	into (directories), and ones you cannot recurse into (everything else).
		256
		257	C<aio_scandir> is a composite request that consists of many
		258	aio-primitives. C<$maxreq> specifies the maximum number of outstanding
		259	aio requests that this function generates. If it is C<< <= 0 >>, then a
		260	suitable default will be chosen (currently 8).
		261
		262	On error, the callback is called without arguments, otherwise it receives
		263	two array-refs with path-relative entry names.
		264
		265	Example:
		266
		267	aio_scandir $dir, 0, sub {
		268	my ($dirs, $nondirs) = @_;
		269	print "real directories: @$dirs\n";
		270	print "everything else: @$nondirs\n";
		271	};
		272
		273	Implementation notes.
		274
		275	The C<aio_readdir> cannot be avoided, but C<stat()>'ing every entry can.
		276
		277	After reading the directory, the modification time, size etc. of the
		278	directory before and after the readdir is checked, and if they match, the
		279	link count will be used to decide how many entries are directories (if
		280	>= 2). Otherwise, no knowledge of the number of subdirectories will be
		281	assumed.
		282
		283	Then entires will be sorted into likely directories (everything without a
		284	non-initial dot) and likely non-directories (everything else). Then every
		285	entry + C</.> will be C<stat>'ed, likely directories first. This is often
		286	faster because filesystems might detect the type of the entry without
		287	reading the inode data (e.g. ext2s filetype feature). If that succeeds,
		288	it assumes that the entry is a directory or a symlink to directory (which
		289	will be checked seperately).
		290
		291	If the known number of directories has been reached, the rest of the
		292	entries is assumed to be non-directories.
		293
		294	=cut
		295
		296	sub aio_scandir($$$) {
		297	my ($path, $maxreq, $cb) = @_;
		298
		299	$maxreq = 8 if $maxreq <= 0;
		300
		301	# stat once
		302	aio_stat $path, sub {
		303	$cb->() if $_[0];
		304	my $hash1 = join ":", (stat _)[0,1,3,7,9];
		305
		306	# read the directory entries
		307	aio_readdir $path, sub {
		308	my $entries = shift
		309	or return $cb->();
		310
		311	# stat the dir another time
		312	aio_stat $path, sub {
		313	my $hash2 = join ":", (stat _)[0,1,3,7,9];
		314
		315	my $ndirs;
		316
		317	# take the slow route if anything looks fishy
		318	if ($hash1 ne $hash2) {
		319	$ndirs = -1;
		320	} else {
		321	# if nlink == 2, we are finished
		322	# on non-posix-fs's, we rely on nlink < 2
		323	$ndirs = (stat _)[3] - 2
		324	or $cb->([], $entries);
		325	}
		326
		327	# sort into likely dirs and likely nondirs
		328	# dirs == files without ".", short entries first
		329	$entries = [map $_->[0],
		330	sort { $b->[1] cmp $a->[1] }
		331	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
		332	@$entries];
		333
		334	my (@dirs, @nondirs);
		335
		336	my ($statcb, $schedcb);
		337	my $nreq = 0;
		338
		339	$schedcb = sub {
		340	if (@$entries) {
		341	if ($nreq < $maxreq) {
		342	my $ent = pop @$entries;
		343	$nreq++;
		344	aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) };
		345	}
		346	} elsif (!$nreq) {
		347	# finished
		348	undef $statcb;
		349	undef $schedcb;
		350	$cb->(\@dirs, \@nondirs);
		351	undef $cb;
		352	}
		353	};
		354	$statcb = sub {
		355	my ($status, $entry) = @_;
		356
		357	if ($status < 0) {
		358	$nreq--;
		359	push @nondirs, $entry;
		360	&$schedcb;
		361	} else {
		362	# need to check for real directory
		363	aio_lstat "$path/$entry", sub {
		364	$nreq--;
		365
		366	if (-d _) {
		367	push @dirs, $entry;
		368
		369	if (!--$ndirs) {
		370	push @nondirs, @$entries;
		371	$entries = [];
		372	}
		373	} else {
		374	push @nondirs, $entry;
		375	}
		376
		377	&$schedcb;
		378	}
		379	}
		380	};
		381
		382	&$schedcb while @$entries && $nreq < $maxreq;
		383	};
		384	};
		385	};
		386	}
		387
247	=item aio_fsync $fh, $callback	388	=item aio_fsync $fh, $callback->($status)
248		389
249	Asynchronously call fsync on the given filehandle and call the callback	390	Asynchronously call fsync on the given filehandle and call the callback
250	with the fsync result code.	391	with the fsync result code.
251		392
252	=item aio_fdatasync $fh, $callback	393	=item aio_fdatasync $fh, $callback->($status)
253		394
254	Asynchronously call fdatasync on the given filehandle and call the	395	Asynchronously call fdatasync on the given filehandle and call the
255	callback with the fdatasync result code.	396	callback with the fdatasync result code.
256		397
257	If this call isn't available because your OS lacks it or it couldn't be	398	If this call isn't available because your OS lacks it or it couldn't be

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.38 by root, Sun Aug 28 10:51:33 2005 UTC vs. Revision 1.42 by root, Mon Dec 26 18:15:23 2005 UTC

Diff Legend

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.38 by root, Sun Aug 28 10:51:33 2005 UTC vs.
Revision 1.42 by root, Mon Dec 26 18:15:23 2005 UTC