[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 1.50 by root, Sat Jun 24 16:27:02 2006 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 = '1.8';
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 aio_rename aio_link aio_move);
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;
77	XSLoader::load IO::AIO, $VERSION;	81	XSLoader::load IO::AIO, $VERSION;
…		…
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
		173	=item aio_move $srcpath, $dstpath, $callback->($status)
		174
		175	[EXPERIMENTAL]
		176
		177	Try to move the I<file> (directories not supported as either source or destination)
		178	from C<$srcpath> to C<$dstpath> and call the callback with the C<0> (error) or C<-1> ok.
		179
		180	This is a composite request that tries to rename(2) the file first. If
		181	rename files with C<EXDEV>, it creates the destination file with mode 0200
		182	and copies the contents of the source file into it using C<aio_sendfile>,
		183	followed by restoring atime, mtime, access mode and uid/gid, in that
		184	order, and unlinking the C<$srcpath>.
		185
		186	If an error occurs, the partial destination file will be unlinked, if
		187	possible, except when setting atime, mtime, access mode and uid/gid, where
		188	errors are being ignored.
		189
		190	=cut
		191
		192	sub aio_move($$$) {
		193	my ($src, $dst, $cb) = @_;
		194
		195	aio_rename $src, $dst, sub {
		196	if ($_[0] && $! == Errno::EXDEV) {
		197	aio_open $src, O_RDONLY, 0, sub {
		198	if (my $src_fh = $_[0]) {
		199	my @stat = stat $src_fh;
		200
		201	aio_open $dst, O_WRONLY, 0200, sub {
		202	if (my $dst_fh = $_[0]) {
		203	aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
		204	close $src_fh;
		205
		206	if ($_[0] == $stat[7]) {
		207	utime $stat[8], $stat[9], $dst;
		208	chmod $stat[2] & 07777, $dst_fh;
		209	chown $stat[4], $stat[5], $dst_fh;
		210	close $dst_fh;
		211
		212	aio_unlink $src, sub {
		213	$cb->($_[0]);
		214	};
		215	} else {
		216	my $errno = $!;
		217	aio_unlink $dst, sub {
		218	$! = $errno;
		219	$cb->(-1);
		220	};
		221	}
		222	};
		223	} else {
		224	$cb->(-1);
		225	}
		226	},
		227
		228	} else {
		229	$cb->(-1);
		230	}
		231	};
		232	} else {
		233	$cb->($_[0]);
		234	}
		235	};
		236	}
		237
169	=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback	238	=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)
170		239
171	Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts	240	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	241	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	242	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	243	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	256	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	257	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	258	value equals C<$length> one can assume that C<$length> bytes have been
190	read.	259	read.
191		260
192	=item aio_readahead $fh,$offset,$length, $callback	261	=item aio_readahead $fh,$offset,$length, $callback->($retval)
193		262
194	C<aio_readahead> populates the page cache with data from a file so that	263	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>	264	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	265	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	266	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.	270	file. The current file offset of the file is left unchanged.
202		271
203	If that syscall doesn't exist (likely if your OS isn't Linux) it will be	272	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.	273	emulated by simply reading the data, which would have a similar effect.
205		274
206	=item aio_stat $fh_or_path, $callback	275	=item aio_stat $fh_or_path, $callback->($status)
207		276
208	=item aio_lstat $fh, $callback	277	=item aio_lstat $fh, $callback->($status)
209		278
210	Works like perl's C<stat> or C<lstat> in void context. The callback will	279	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 _>	280	be called after the stat and the results will be available using C<stat _>
212	or C<-s _> etc...	281	or C<-s _> etc...
213		282
…		…
223	aio_stat "/etc/passwd", sub {	292	aio_stat "/etc/passwd", sub {
224	$_[0] and die "stat failed: $!";	293	$_[0] and die "stat failed: $!";
225	print "size is ", -s _, "\n";	294	print "size is ", -s _, "\n";
226	};	295	};
227		296
228	=item aio_unlink $pathname, $callback	297	=item aio_unlink $pathname, $callback->($status)
229		298
230	Asynchronously unlink (delete) a file and call the callback with the	299	Asynchronously unlink (delete) a file and call the callback with the
231	result code.	300	result code.
232		301
		302	=item aio_link $srcpath, $dstpath, $callback->($status)
		303
		304	Asynchronously create a new link to the existing object at C<$srcpath> at
		305	the path C<$dstpath> and call the callback with the result code.
		306
		307	=item aio_symlink $srcpath, $dstpath, $callback->($status)
		308
		309	Asynchronously create a new symbolic link to the existing object at C<$srcpath> at
		310	the path C<$dstpath> and call the callback with the result code.
		311
		312	=item aio_rename $srcpath, $dstpath, $callback->($status)
		313
		314	Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as
		315	rename(2) and call the callback with the result code.
		316
233	=item aio_rmdir $pathname, $callback	317	=item aio_rmdir $pathname, $callback->($status)
234		318
235	Asynchronously rmdir (delete) a directory and call the callback with the	319	Asynchronously rmdir (delete) a directory and call the callback with the
236	result code.	320	result code.
237		321
238	=item aio_readdir $pathname $callback	322	=item aio_readdir $pathname, $callback->($entries)
239		323
240	Unlike the POSIX call of the same name, C<aio_readdir> reads an entire	324	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	325	directory (i.e. opendir + readdir + closedir). The entries will not be
242	sorted, and will B<NOT> include the C<.> and C<..> entries.	326	sorted, and will B<NOT> include the C<.> and C<..> entries.
243		327
244	The callback a single argument which is either C<undef> or an array-ref	328	The callback a single argument which is either C<undef> or an array-ref
245	with the filenames.	329	with the filenames.
246		330
		331	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
		332
		333	Scans a directory (similar to C<aio_readdir>) and tries to separate the
		334	entries of directory C<$path> into two sets of names, ones you can recurse
		335	into (directories), and ones you cannot recurse into (everything else).
		336
		337	C<aio_scandir> is a composite request that consists of many
		338	aio-primitives. C<$maxreq> specifies the maximum number of outstanding
		339	aio requests that this function generates. If it is C<< <= 0 >>, then a
		340	suitable default will be chosen (currently 8).
		341
		342	On error, the callback is called without arguments, otherwise it receives
		343	two array-refs with path-relative entry names.
		344
		345	Example:
		346
		347	aio_scandir $dir, 0, sub {
		348	my ($dirs, $nondirs) = @_;
		349	print "real directories: @$dirs\n";
		350	print "everything else: @$nondirs\n";
		351	};
		352
		353	Implementation notes.
		354
		355	The C<aio_readdir> cannot be avoided, but C<stat()>'ing every entry can.
		356
		357	After reading the directory, the modification time, size etc. of the
		358	directory before and after the readdir is checked, and if they match, the
		359	link count will be used to decide how many entries are directories (if
		360	>= 2). Otherwise, no knowledge of the number of subdirectories will be
		361	assumed.
		362
		363	Then entires will be sorted into likely directories (everything without a
		364	non-initial dot) and likely non-directories (everything else). Then every
		365	entry + C</.> will be C<stat>'ed, likely directories first. This is often
		366	faster because filesystems might detect the type of the entry without
		367	reading the inode data (e.g. ext2fs filetype feature). If that succeeds,
		368	it assumes that the entry is a directory or a symlink to directory (which
		369	will be checked seperately).
		370
		371	If the known number of directories has been reached, the rest of the
		372	entries is assumed to be non-directories.
		373
		374	=cut
		375
		376	sub aio_scandir($$$) {
		377	my ($path, $maxreq, $cb) = @_;
		378
		379	$maxreq = 8 if $maxreq <= 0;
		380
		381	# stat once
		382	aio_stat $path, sub {
		383	return $cb->() if $_[0];
		384	my $hash1 = join ":", (stat _)[0,1,3,7,9];
		385
		386	# read the directory entries
		387	aio_readdir $path, sub {
		388	my $entries = shift
		389	or return $cb->();
		390
		391	# stat the dir another time
		392	aio_stat $path, sub {
		393	my $hash2 = join ":", (stat _)[0,1,3,7,9];
		394
		395	my $ndirs;
		396
		397	# take the slow route if anything looks fishy
		398	if ($hash1 ne $hash2) {
		399	$ndirs = -1;
		400	} else {
		401	# if nlink == 2, we are finished
		402	# on non-posix-fs's, we rely on nlink < 2
		403	$ndirs = (stat _)[3] - 2
		404	or return $cb->([], $entries);
		405	}
		406
		407	# sort into likely dirs and likely nondirs
		408	# dirs == files without ".", short entries first
		409	$entries = [map $_->[0],
		410	sort { $b->[1] cmp $a->[1] }
		411	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
		412	@$entries];
		413
		414	my (@dirs, @nondirs);
		415
		416	my ($statcb, $schedcb);
		417	my $nreq = 0;
		418
		419	$schedcb = sub {
		420	if (@$entries) {
		421	if ($nreq < $maxreq) {
		422	my $ent = pop @$entries;
		423	$nreq++;
		424	aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) };
		425	}
		426	} elsif (!$nreq) {
		427	# finished
		428	undef $statcb;
		429	undef $schedcb;
		430	$cb->(\@dirs, \@nondirs) if $cb;
		431	undef $cb;
		432	}
		433	};
		434	$statcb = sub {
		435	my ($status, $entry) = @_;
		436
		437	if ($status < 0) {
		438	$nreq--;
		439	push @nondirs, $entry;
		440	&$schedcb;
		441	} else {
		442	# need to check for real directory
		443	aio_lstat "$path/$entry", sub {
		444	$nreq--;
		445
		446	if (-d _) {
		447	push @dirs, $entry;
		448
		449	if (!--$ndirs) {
		450	push @nondirs, @$entries;
		451	$entries = [];
		452	}
		453	} else {
		454	push @nondirs, $entry;
		455	}
		456
		457	&$schedcb;
		458	}
		459	}
		460	};
		461
		462	&$schedcb while @$entries && $nreq < $maxreq;
		463	};
		464	};
		465	};
		466	}
		467
247	=item aio_fsync $fh, $callback	468	=item aio_fsync $fh, $callback->($status)
248		469
249	Asynchronously call fsync on the given filehandle and call the callback	470	Asynchronously call fsync on the given filehandle and call the callback
250	with the fsync result code.	471	with the fsync result code.
251		472
252	=item aio_fdatasync $fh, $callback	473	=item aio_fdatasync $fh, $callback->($status)
253		474
254	Asynchronously call fdatasync on the given filehandle and call the	475	Asynchronously call fdatasync on the given filehandle and call the
255	callback with the fdatasync result code.	476	callback with the fdatasync result code.
256		477
257	If this call isn't available because your OS lacks it or it couldn't be	478	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 1.50 by root, Sat Jun 24 16:27:02 2006 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 1.50 by root, Sat Jun 24 16:27:02 2006 UTC