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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.55 by root, Sun Oct 22 00:49:29 2006 UTC vs.
Revision 1.88 by root, Sun Oct 29 01:50:29 2006 UTC

…		…
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		19
20	use IO::AIO 2; # version has aio objects	20	# version 2+ has request and group objects
		21	use IO::AIO 2;
21		22
		23	aioreq_pri 4; # give next request a very high priority
22	my $req = aio_unlink "/tmp/file", sub { };	24	my $req = aio_unlink "/tmp/file", sub { };
23	$req->cancel; # cancel request if still in queue	25	$req->cancel; # cancel request if still in queue
24		26
25	# AnyEvent	27	my $grp = aio_group sub { print "all stats done\n" };
		28	add $grp aio_stat "..." for ...;
		29
		30	# AnyEvent integration
26	open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!";	31	open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!";
27	my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb });	32	my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb });
28		33
29	# Event	34	# Event integration
30	Event->io (fd => IO::AIO::poll_fileno,	35	Event->io (fd => IO::AIO::poll_fileno,
31	poll => 'r',	36	poll => 'r',
32	cb => \&IO::AIO::poll_cb);	37	cb => \&IO::AIO::poll_cb);
33		38
34	# Glib/Gtk2	39	# Glib/Gtk2 integration
35	add_watch Glib::IO IO::AIO::poll_fileno,	40	add_watch Glib::IO IO::AIO::poll_fileno,
36	in => sub { IO::AIO::poll_cb; 1 };	41	in => sub { IO::AIO::poll_cb; 1 };
37		42
38	# Tk	43	# Tk integration
39	Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "",	44	Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "",
40	readable => \&IO::AIO::poll_cb);	45	readable => \&IO::AIO::poll_cb);
41		46
42	# Danga::Socket	47	# Danga::Socket integration
43	Danga::Socket->AddOtherFds (IO::AIO::poll_fileno =>	48	Danga::Socket->AddOtherFds (IO::AIO::poll_fileno =>
44	\&IO::AIO::poll_cb);	49	\&IO::AIO::poll_cb);
45		50
46
47	=head1 DESCRIPTION	51	=head1 DESCRIPTION
48		52
49	This module implements asynchronous I/O using whatever means your	53	This module implements asynchronous I/O using whatever means your
50	operating system supports.	54	operating system supports.
51		55
		56	Asynchronous means that operations that can normally block your program
		57	(e.g. reading from disk) will be done asynchronously: the operation
		58	will still block, but you can do something else in the meantime. This
		59	is extremely useful for programs that need to stay interactive even
		60	when doing heavy I/O (GUI programs, high performance network servers
		61	etc.), but can also be used to easily do operations in parallel that are
		62	normally done sequentially, e.g. stat'ing many files, which is much faster
		63	on a RAID volume or over NFS when you do a number of stat operations
		64	concurrently.
		65
		66	While this works on all types of file descriptors (for example sockets),
		67	using these functions on file descriptors that support nonblocking
		68	operation (again, sockets, pipes etc.) is very inefficient. Use an event
		69	loop for that (such as the L<Event\|Event> module): IO::AIO will naturally
		70	fit into such an event loop itself.
		71
52	Currently, a number of threads are started that execute your read/writes	72	In this version, a number of threads are started that execute your
53	and signal their completion. You don't need thread support in your libc or	73	requests and signal their completion. You don't need thread support
54	perl, and the threads created by this module will not be visible to the	74	in perl, and the threads created by this module will not be visible
55	pthreads library. In the future, this module might make use of the native	75	to perl. In the future, this module might make use of the native aio
56	aio functions available on many operating systems. However, they are often	76	functions available on many operating systems. However, they are often
57	not well-supported (Linux doesn't allow them on normal files currently,	77	not well-supported or restricted (GNU/Linux doesn't allow them on normal
58	for example), and they would only support aio_read and aio_write, so the	78	files currently, for example), and they would only support aio_read and
59	remaining functionality would have to be implemented using threads anyway.	79	aio_write, so the remaining functionality would have to be implemented
		80	using threads anyway.
60		81
61	Although the module will work with in the presence of other threads, it is	82	Although the module will work with in the presence of other (Perl-)
62	currently not reentrant, so use appropriate locking yourself, always call	83	threads, it is currently not reentrant in any way, so use appropriate
63	C<poll_cb> from within the same thread, or never call C<poll_cb> (or other	84	locking yourself, always call C<poll_cb> from within the same thread, or
64	C<aio_> functions) recursively.	85	never call C<poll_cb> (or other C<aio_> functions) recursively.
		86
		87	=head2 EXAMPLE
		88
		89	This is a simple example that uses the Event module and loads
		90	F</etc/passwd> asynchronously:
		91
		92	use Fcntl;
		93	use Event;
		94	use IO::AIO;
		95
		96	# register the IO::AIO callback with Event
		97	Event->io (fd => IO::AIO::poll_fileno,
		98	poll => 'r',
		99	cb => \&IO::AIO::poll_cb);
		100
		101	# queue the request to open /etc/passwd
		102	aio_open "/etc/passwd", O_RDONLY, 0, sub {
		103	my $fh = $_[0]
		104	or die "error while opening: $!";
		105
		106	# stat'ing filehandles is generally non-blocking
		107	my $size = -s $fh;
		108
		109	# queue a request to read the file
		110	my $contents;
		111	aio_read $fh, 0, $size, $contents, 0, sub {
		112	$_[0] == $size
		113	or die "short read: $!";
		114
		115	close $fh;
		116
		117	# file contents now in $contents
		118	print $contents;
		119
		120	# exit event loop and program
		121	Event::unloop;
		122	};
		123	};
		124
		125	# possibly queue up other requests, or open GUI windows,
		126	# check for sockets etc. etc.
		127
		128	# process events as long as there are some:
		129	Event::loop;
		130
		131	=head1 REQUEST ANATOMY AND LIFETIME
		132
		133	Every C<aio_*> function creates a request. which is a C data structure not
		134	directly visible to Perl.
		135
		136	If called in non-void context, every request function returns a Perl
		137	object representing the request. In void context, nothing is returned,
		138	which saves a bit of memory.
		139
		140	The perl object is a fairly standard ref-to-hash object. The hash contents
		141	are not used by IO::AIO so you are free to store anything you like in it.
		142
		143	During their existance, aio requests travel through the following states,
		144	in order:
		145
		146	=over 4
		147
		148	=item ready
		149
		150	Immediately after a request is created it is put into the ready state,
		151	waiting for a thread to execute it.
		152
		153	=item execute
		154
		155	A thread has accepted the request for processing and is currently
		156	executing it (e.g. blocking in read).
		157
		158	=item pending
		159
		160	The request has been executed and is waiting for result processing.
		161
		162	While request submission and execution is fully asynchronous, result
		163	processing is not and relies on the perl interpreter calling C<poll_cb>
		164	(or another function with the same effect).
		165
		166	=item result
		167
		168	The request results are processed synchronously by C<poll_cb>.
		169
		170	The C<poll_cb> function will process all outstanding aio requests by
		171	calling their callbacks, freeing memory associated with them and managing
		172	any groups they are contained in.
		173
		174	=item done
		175
		176	Request has reached the end of its lifetime and holds no resources anymore
		177	(except possibly for the Perl object, but its connection to the actual
		178	aio request is severed and calling its methods will either do nothing or
		179	result in a runtime error).
		180
		181	=back
65		182
66	=cut	183	=cut
67		184
68	package IO::AIO;	185	package IO::AIO;
69		186
…		…
71	use strict 'vars';	188	use strict 'vars';
72		189
73	use base 'Exporter';	190	use base 'Exporter';
74		191
75	BEGIN {	192	BEGIN {
76	our $VERSION = '2.0';	193	our $VERSION = '2.1';
77		194
78	our @EXPORT = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat	195	our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat
79	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink	196	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink
80	aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move	197	aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move
81	aio_group);	198	aio_copy aio_group aio_nop aio_mknod);
82	our @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs);	199	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));
		200	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
		201	min_parallel max_parallel max_idle
		202	nreqs nready npending nthreads
		203	max_poll_time max_poll_reqs);
83		204
84	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';	205	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';
85		206
86	require XSLoader;	207	require XSLoader;
87	XSLoader::load ("IO::AIO", $VERSION);	208	XSLoader::load ("IO::AIO", $VERSION);
88	}	209	}
89		210
90	=head1 FUNCTIONS	211	=head1 FUNCTIONS
91		212
92	=head2 AIO FUNCTIONS	213	=head2 AIO REQUEST FUNCTIONS
93		214
94	All the C<aio_*> calls are more or less thin wrappers around the syscall	215	All the C<aio_*> calls are more or less thin wrappers around the syscall
95	with the same name (sans C<aio_>). The arguments are similar or identical,	216	with the same name (sans C<aio_>). The arguments are similar or identical,
96	and they all accept an additional (and optional) C<$callback> argument	217	and they all accept an additional (and optional) C<$callback> argument
97	which must be a code reference. This code reference will get called with	218	which must be a code reference. This code reference will get called with
…		…
100	syscall has been executed asynchronously.	221	syscall has been executed asynchronously.
101		222
102	All functions expecting a filehandle keep a copy of the filehandle	223	All functions expecting a filehandle keep a copy of the filehandle
103	internally until the request has finished.	224	internally until the request has finished.
104		225
105	All requests return objects of type L<IO::AIO::REQ> that allow further	226	All functions return request objects of type L<IO::AIO::REQ> that allow
106	manipulation of those requests while they are in-flight.	227	further manipulation of those requests while they are in-flight.
107		228
108	The pathnames you pass to these routines I<must> be absolute and	229	The pathnames you pass to these routines I<must> be absolute and
109	encoded in byte form. The reason for the former is that at the time the	230	encoded as octets. The reason for the former is that at the time the
110	request is being executed, the current working directory could have	231	request is being executed, the current working directory could have
111	changed. Alternatively, you can make sure that you never change the	232	changed. Alternatively, you can make sure that you never change the
112	current working directory.	233	current working directory anywhere in the program and then use relative
		234	paths.
113		235
114	To encode pathnames to byte form, either make sure you either: a)	236	To encode pathnames as octets, either make sure you either: a) always pass
115	always pass in filenames you got from outside (command line, readdir	237	in filenames you got from outside (command line, readdir etc.) without
116	etc.), b) are ASCII or ISO 8859-1, c) use the Encode module and encode	238	tinkering, b) are ASCII or ISO 8859-1, c) use the Encode module and encode
117	your pathnames to the locale (or other) encoding in effect in the user	239	your pathnames to the locale (or other) encoding in effect in the user
118	environment, d) use Glib::filename_from_unicode on unicode filenames or e)	240	environment, d) use Glib::filename_from_unicode on unicode filenames or e)
119	use something else.	241	use something else to ensure your scalar has the correct contents.
		242
		243	This works, btw. independent of the internal UTF-8 bit, which IO::AIO
		244	handles correctly wether it is set or not.
120		245
121	=over 4	246	=over 4
		247
		248	=item $prev_pri = aioreq_pri [$pri]
		249
		250	Returns the priority value that would be used for the next request and, if
		251	C<$pri> is given, sets the priority for the next aio request.
		252
		253	The default priority is C<0>, the minimum and maximum priorities are C<-4>
		254	and C<4>, respectively. Requests with higher priority will be serviced
		255	first.
		256
		257	The priority will be reset to C<0> after each call to one of the C<aio_*>
		258	functions.
		259
		260	Example: open a file with low priority, then read something from it with
		261	higher priority so the read request is serviced before other low priority
		262	open requests (potentially spamming the cache):
		263
		264	aioreq_pri -3;
		265	aio_open ..., sub {
		266	return unless $_[0];
		267
		268	aioreq_pri -2;
		269	aio_read $_[0], ..., sub {
		270	...
		271	};
		272	};
		273
		274	=item aioreq_nice $pri_adjust
		275
		276	Similar to C<aioreq_pri>, but subtracts the given value from the current
		277	priority, so the effect is cumulative.
122		278
123	=item aio_open $pathname, $flags, $mode, $callback->($fh)	279	=item aio_open $pathname, $flags, $mode, $callback->($fh)
124		280
125	Asynchronously open or create a file and call the callback with a newly	281	Asynchronously open or create a file and call the callback with a newly
126	created filehandle for the file.	282	created filehandle for the file.
…		…
176		332
177	aio_read $fh, 7, 15, $buffer, 0, sub {	333	aio_read $fh, 7, 15, $buffer, 0, sub {
178	$_[0] > 0 or die "read error: $!";	334	$_[0] > 0 or die "read error: $!";
179	print "read $_[0] bytes: <$buffer>\n";	335	print "read $_[0] bytes: <$buffer>\n";
180	};	336	};
181
182	=item aio_move $srcpath, $dstpath, $callback->($status)
183
184	Try to move the I<file> (directories not supported as either source or
185	destination) from C<$srcpath> to C<$dstpath> and call the callback with
186	the C<0> (error) or C<-1> ok.
187
188	This is a composite request that tries to rename(2) the file first. If
189	rename files with C<EXDEV>, it creates the destination file with mode 0200
190	and copies the contents of the source file into it using C<aio_sendfile>,
191	followed by restoring atime, mtime, access mode and uid/gid, in that
192	order, and unlinking the C<$srcpath>.
193
194	If an error occurs, the partial destination file will be unlinked, if
195	possible, except when setting atime, mtime, access mode and uid/gid, where
196	errors are being ignored.
197
198	=cut
199
200	sub aio_move($$$) {
201	my ($src, $dst, $cb) = @_;
202
203	my $grp = aio_group;
204
205	add $grp aio_rename $src, $dst, sub {
206	if ($_[0] && $! == EXDEV) {
207	add $grp aio_open $src, O_RDONLY, 0, sub {
208	if (my $src_fh = $_[0]) {
209	my @stat = stat $src_fh;
210
211	add $grp aio_open $dst, O_WRONLY, 0200, sub {
212	if (my $dst_fh = $_[0]) {
213	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
214	close $src_fh;
215
216	if ($_[0] == $stat[7]) {
217	utime $stat[8], $stat[9], $dst;
218	chmod $stat[2] & 07777, $dst_fh;
219	chown $stat[4], $stat[5], $dst_fh;
220	close $dst_fh;
221
222	add $grp aio_unlink $src, sub {
223	$cb->($_[0]);
224	};
225	} else {
226	my $errno = $!;
227	add $grp aio_unlink $dst, sub {
228	$! = $errno;
229	$cb->(-1);
230	};
231	}
232	};
233	} else {
234	$cb->(-1);
235	}
236	},
237
238	} else {
239	$cb->(-1);
240	}
241	};
242	} else {
243	$cb->($_[0]);
244	}
245	};
246
247	$grp
248	}
249		337
250	=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)	338	=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)
251		339
252	Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts	340	Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts
253	reading at byte offset C<$in_offset>, and starts writing at the current	341	reading at byte offset C<$in_offset>, and starts writing at the current
…		…
309	=item aio_unlink $pathname, $callback->($status)	397	=item aio_unlink $pathname, $callback->($status)
310		398
311	Asynchronously unlink (delete) a file and call the callback with the	399	Asynchronously unlink (delete) a file and call the callback with the
312	result code.	400	result code.
313		401
		402	=item aio_mknod $path, $mode, $dev, $callback->($status)
		403
		404	[EXPERIMENTAL]
		405
		406	Asynchronously create a device node (or fifo). See mknod(2).
		407
		408	The only (POSIX-) portable way of calling this function is:
		409
		410	aio_mknod $path, IO::AIO::S_IFIFO \| $mode, 0, sub { ...
		411
314	=item aio_link $srcpath, $dstpath, $callback->($status)	412	=item aio_link $srcpath, $dstpath, $callback->($status)
315		413
316	Asynchronously create a new link to the existing object at C<$srcpath> at	414	Asynchronously create a new link to the existing object at C<$srcpath> at
317	the path C<$dstpath> and call the callback with the result code.	415	the path C<$dstpath> and call the callback with the result code.
318		416
…		…
338	sorted, and will B<NOT> include the C<.> and C<..> entries.	436	sorted, and will B<NOT> include the C<.> and C<..> entries.
339		437
340	The callback a single argument which is either C<undef> or an array-ref	438	The callback a single argument which is either C<undef> or an array-ref
341	with the filenames.	439	with the filenames.
342		440
		441	=item aio_copy $srcpath, $dstpath, $callback->($status)
		442
		443	Try to copy the I<file> (directories not supported as either source or
		444	destination) from C<$srcpath> to C<$dstpath> and call the callback with
		445	the C<0> (error) or C<-1> ok.
		446
		447	This is a composite request that it creates the destination file with
		448	mode 0200 and copies the contents of the source file into it using
		449	C<aio_sendfile>, followed by restoring atime, mtime, access mode and
		450	uid/gid, in that order.
		451
		452	If an error occurs, the partial destination file will be unlinked, if
		453	possible, except when setting atime, mtime, access mode and uid/gid, where
		454	errors are being ignored.
		455
		456	=cut
		457
		458	sub aio_copy($$;$) {
		459	my ($src, $dst, $cb) = @_;
		460
		461	my $pri = aioreq_pri;
		462	my $grp = aio_group $cb;
		463
		464	aioreq_pri $pri;
		465	add $grp aio_open $src, O_RDONLY, 0, sub {
		466	if (my $src_fh = $_[0]) {
		467	my @stat = stat $src_fh;
		468
		469	aioreq_pri $pri;
		470	add $grp aio_open $dst, O_CREAT \| O_WRONLY \| O_TRUNC, 0200, sub {
		471	if (my $dst_fh = $_[0]) {
		472	aioreq_pri $pri;
		473	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
		474	if ($_[0] == $stat[7]) {
		475	$grp->result (0);
		476	close $src_fh;
		477
		478	# those should not normally block. should. should.
		479	utime $stat[8], $stat[9], $dst;
		480	chmod $stat[2] & 07777, $dst_fh;
		481	chown $stat[4], $stat[5], $dst_fh;
		482	close $dst_fh;
		483	} else {
		484	$grp->result (-1);
		485	close $src_fh;
		486	close $dst_fh;
		487
		488	aioreq $pri;
		489	add $grp aio_unlink $dst;
		490	}
		491	};
		492	} else {
		493	$grp->result (-1);
		494	}
		495	},
		496
		497	} else {
		498	$grp->result (-1);
		499	}
		500	};
		501
		502	$grp
		503	}
		504
		505	=item aio_move $srcpath, $dstpath, $callback->($status)
		506
		507	Try to move the I<file> (directories not supported as either source or
		508	destination) from C<$srcpath> to C<$dstpath> and call the callback with
		509	the C<0> (error) or C<-1> ok.
		510
		511	This is a composite request that tries to rename(2) the file first. If
		512	rename files with C<EXDEV>, it copies the file with C<aio_copy> and, if
		513	that is successful, unlinking the C<$srcpath>.
		514
		515	=cut
		516
		517	sub aio_move($$;$) {
		518	my ($src, $dst, $cb) = @_;
		519
		520	my $pri = aioreq_pri;
		521	my $grp = aio_group $cb;
		522
		523	aioreq_pri $pri;
		524	add $grp aio_rename $src, $dst, sub {
		525	if ($_[0] && $! == EXDEV) {
		526	aioreq_pri $pri;
		527	add $grp aio_copy $src, $dst, sub {
		528	$grp->result ($_[0]);
		529
		530	if (!$_[0]) {
		531	aioreq_pri $pri;
		532	add $grp aio_unlink $src;
		533	}
		534	};
		535	} else {
		536	$grp->result ($_[0]);
		537	}
		538	};
		539
		540	$grp
		541	}
		542
343	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)	543	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
344		544
345	Scans a directory (similar to C<aio_readdir>) but additionally tries to	545	Scans a directory (similar to C<aio_readdir>) but additionally tries to
346	separate the entries of directory C<$path> into two sets of names, ones	546	efficiently separate the entries of directory C<$path> into two sets of
347	you can recurse into (directories or links to them), and ones you cannot	547	names, directories you can recurse into (directories), and ones you cannot
348	recurse into (everything else).	548	recurse into (everything else, including symlinks to directories).
349		549
350	C<aio_scandir> is a composite request that consists of many sub	550	C<aio_scandir> is a composite request that creates of many sub requests_
351	requests. C<$maxreq> specifies the maximum number of outstanding aio	551	C<$maxreq> specifies the maximum number of outstanding aio requests that
352	requests that this function generates. If it is C<< <= 0 >>, then a	552	this function generates. If it is C<< <= 0 >>, then a suitable default
353	suitable default will be chosen (currently 8).	553	will be chosen (currently 4).
354		554
355	On error, the callback is called without arguments, otherwise it receives	555	On error, the callback is called without arguments, otherwise it receives
356	two array-refs with path-relative entry names.	556	two array-refs with path-relative entry names.
357		557
358	Example:	558	Example:
…		…
395	=cut	595	=cut
396		596
397	sub aio_scandir($$$) {	597	sub aio_scandir($$$) {
398	my ($path, $maxreq, $cb) = @_;	598	my ($path, $maxreq, $cb) = @_;
399		599
		600	my $pri = aioreq_pri;
		601
400	my $grp = aio_group;	602	my $grp = aio_group $cb;
401		603
402	$maxreq = 8 if $maxreq <= 0;	604	$maxreq = 4 if $maxreq <= 0;
403		605
404	# stat once	606	# stat once
		607	aioreq_pri $pri;
405	add $grp aio_stat $path, sub {	608	add $grp aio_stat $path, sub {
406	return $cb->() if $_[0];	609	return $grp->result () if $_[0];
407	my $now = time;	610	my $now = time;
408	my $hash1 = join ":", (stat _)[0,1,3,7,9];	611	my $hash1 = join ":", (stat _)[0,1,3,7,9];
409		612
410	# read the directory entries	613	# read the directory entries
		614	aioreq_pri $pri;
411	add $grp aio_readdir $path, sub {	615	add $grp aio_readdir $path, sub {
412	my $entries = shift	616	my $entries = shift
413	or return $cb->();	617	or return $grp->result ();
414		618
415	# stat the dir another time	619	# stat the dir another time
		620	aioreq_pri $pri;
416	add $grp aio_stat $path, sub {	621	add $grp aio_stat $path, sub {
417	my $hash2 = join ":", (stat _)[0,1,3,7,9];	622	my $hash2 = join ":", (stat _)[0,1,3,7,9];
418		623
419	my $ndirs;	624	my $ndirs;
420		625
…		…
423	$ndirs = -1;	628	$ndirs = -1;
424	} else {	629	} else {
425	# if nlink == 2, we are finished	630	# if nlink == 2, we are finished
426	# on non-posix-fs's, we rely on nlink < 2	631	# on non-posix-fs's, we rely on nlink < 2
427	$ndirs = (stat _)[3] - 2	632	$ndirs = (stat _)[3] - 2
428	or return $cb->([], $entries);	633	or return $grp->result ([], $entries);
429	}	634	}
430		635
431	# sort into likely dirs and likely nondirs	636	# sort into likely dirs and likely nondirs
432	# dirs == files without ".", short entries first	637	# dirs == files without ".", short entries first
433	$entries = [map $_->[0],	638	$entries = [map $_->[0],
…		…
435	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],	640	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
436	@$entries];	641	@$entries];
437		642
438	my (@dirs, @nondirs);	643	my (@dirs, @nondirs);
439		644
440	my ($statcb, $schedcb);	645	my $statgrp = add $grp aio_group sub {
441	my $nreq = 0;	646	$grp->result (\@dirs, \@nondirs);
		647	};
442		648
443	$schedcb = sub {	649	limit $statgrp $maxreq;
444	if (@$entries) {	650	feed $statgrp sub {
445	if ($nreq < $maxreq) {	651	return unless @$entries;
446	my $ent = pop @$entries;	652	my $entry = pop @$entries;
		653
		654	aioreq_pri $pri;
		655	add $statgrp aio_stat "$path/$entry/.", sub {
		656	if ($_[0] < 0) {
		657	push @nondirs, $entry;
		658	} else {
		659	# need to check for real directory
		660	aioreq_pri $pri;
		661	add $statgrp aio_lstat "$path/$entry", sub {
		662	if (-d _) {
		663	push @dirs, $entry;
		664
		665	unless (--$ndirs) {
		666	push @nondirs, @$entries;
		667	feed $statgrp;
		668	}
		669	} else {
		670	push @nondirs, $entry;
		671	}
447	$nreq++;	672	}
448	add $grp aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) };
449	}	673	}
450	} elsif (!$nreq) {
451	# finished
452	undef $statcb;
453	undef $schedcb;
454	$cb->(\@dirs, \@nondirs) if $cb;
455	undef $cb;
456	}	674	};
457	};	675	};
458	$statcb = sub {
459	my ($status, $entry) = @_;
460
461	if ($status < 0) {
462	$nreq--;
463	push @nondirs, $entry;
464	&$schedcb;
465	} else {
466	# need to check for real directory
467	add $grp aio_lstat "$path/$entry", sub {
468	$nreq--;
469
470	if (-d _) {
471	push @dirs, $entry;
472
473	if (!--$ndirs) {
474	push @nondirs, @$entries;
475	$entries = [];
476	}
477	} else {
478	push @nondirs, $entry;
479	}
480
481	&$schedcb;
482	}
483	}
484	};
485
486	&$schedcb while @$entries && $nreq < $maxreq;
487	};	676	};
488	};	677	};
489	};	678	};
490		679
491	$grp	680	$grp
…		…
502	callback with the fdatasync result code.	691	callback with the fdatasync result code.
503		692
504	If this call isn't available because your OS lacks it or it couldn't be	693	If this call isn't available because your OS lacks it or it couldn't be
505	detected, it will be emulated by calling C<fsync> instead.	694	detected, it will be emulated by calling C<fsync> instead.
506		695
507	=item aio_group $callback->()	696	=item aio_group $callback->(...)
508
509	[EXPERIMENTAL]
510		697
511	This is a very special aio request: Instead of doing something, it is a	698	This is a very special aio request: Instead of doing something, it is a
512	container for other aio requests, which is useful if you want to bundle	699	container for other aio requests, which is useful if you want to bundle
513	many requests into a single, composite, request.	700	many requests into a single, composite, request with a definite callback
		701	and the ability to cancel the whole request with its subrequests.
514		702
515	Returns an object of class L<IO::AIO::GRP>. See its documentation below	703	Returns an object of class L<IO::AIO::GRP>. See its documentation below
516	for more info.	704	for more info.
517		705
518	Example:	706	Example:
…		…
524	add $grp	712	add $grp
525	(aio_stat ...),	713	(aio_stat ...),
526	(aio_stat ...),	714	(aio_stat ...),
527	...;	715	...;
528		716
		717	=item aio_nop $callback->()
		718
		719	This is a special request - it does nothing in itself and is only used for
		720	side effects, such as when you want to add a dummy request to a group so
		721	that finishing the requests in the group depends on executing the given
		722	code.
		723
		724	While this request does nothing, it still goes through the execution
		725	phase and still requires a worker thread. Thus, the callback will not
		726	be executed immediately but only after other requests in the queue have
		727	entered their execution phase. This can be used to measure request
		728	latency.
		729
529	=item aio_sleep $fractional_seconds, $callback->() NOT EXPORTED	730	=item IO::AIO::aio_busy $fractional_seconds, $callback->() NOT EXPORTED
530		731
531	Mainly used for debugging and benchmarking, this aio request puts one of	732	Mainly used for debugging and benchmarking, this aio request puts one of
532	the request workers to sleep for the given time.	733	the request workers to sleep for the given time.
533		734
		735	While it is theoretically handy to have simple I/O scheduling requests
		736	like sleep and file handle readable/writable, the overhead this creates is
		737	immense (it blocks a thread for a long time) so do not use this function
		738	except to put your application under artificial I/O pressure.
		739
534	=back	740	=back
535		741
536	=head2 IO::AIO::REQ CLASS	742	=head2 IO::AIO::REQ CLASS
537		743
538	All non-aggregate C<aio_*> functions return an object of this class when	744	All non-aggregate C<aio_*> functions return an object of this class when
539	called in non-void context.	745	called in non-void context.
540		746
541	A request always moves through the following five states in its lifetime,
542	in order: B<ready> (request has been created, but has not been executed
543	yet), B<execute> (request is currently being executed), B<pending>
544	(request has been executed but callback has not been called yet),
545	B<result> (results are being processed synchronously, includes calling the
546	callback) and B<done> (request has reached the end of its lifetime and
547	holds no resources anymore).
548
549	=over 4	747	=over 4
550		748
551	=item $req->cancel	749	=item cancel $req
552		750
553	Cancels the request, if possible. Has the effect of skipping execution	751	Cancels the request, if possible. Has the effect of skipping execution
554	when entering the B<execute> state and skipping calling the callback when	752	when entering the B<execute> state and skipping calling the callback when
555	entering the the B<result> state, but will leave the request otherwise	753	entering the the B<result> state, but will leave the request otherwise
556	untouched. That means that requests that currently execute will not be	754	untouched. That means that requests that currently execute will not be
557	stopped and resources held by the request will not be freed prematurely.	755	stopped and resources held by the request will not be freed prematurely.
558		756
		757	=item cb $req $callback->(...)
		758
		759	Replace (or simply set) the callback registered to the request.
		760
559	=back	761	=back
560		762
561	=head2 IO::AIO::GRP CLASS	763	=head2 IO::AIO::GRP CLASS
562		764
563	This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to	765	This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to
…		…
577	You add requests by calling the C<add> method with one or more	779	You add requests by calling the C<add> method with one or more
578	C<IO::AIO::REQ> objects:	780	C<IO::AIO::REQ> objects:
579		781
580	$grp->add (aio_unlink "...");	782	$grp->add (aio_unlink "...");
581		783
582	add $grp aio_stat "...", sub { ... };	784	add $grp aio_stat "...", sub {
		785	$_[0] or return $grp->result ("error");
		786
		787	# add another request dynamically, if first succeeded
		788	add $grp aio_open "...", sub {
		789	$grp->result ("ok");
		790	};
		791	};
583		792
584	This makes it very easy to create composite requests (see the source of	793	This makes it very easy to create composite requests (see the source of
585	C<aio_move> for an application) that work and feel like simple requests.	794	C<aio_move> for an application) that work and feel like simple requests.
586		795
		796	=over 4
		797
587	The IO::AIO::GRP objects will be cleaned up during calls to	798	=item * The IO::AIO::GRP objects will be cleaned up during calls to
588	C<IO::AIO::poll_cb>, just like any other request.	799	C<IO::AIO::poll_cb>, just like any other request.
589		800
590	They can be canceled like any other request. Canceling will cancel not	801	=item * They can be canceled like any other request. Canceling will cancel not
591	just the request itself, but also all requests it contains.	802	only the request itself, but also all requests it contains.
592		803
593	They can also can also be added to other IO::AIO::GRP objects.	804	=item * They can also can also be added to other IO::AIO::GRP objects.
		805
		806	=item * You must not add requests to a group from within the group callback (or
		807	any later time).
		808
		809	=back
594		810
595	Their lifetime, simplified, looks like this: when they are empty, they	811	Their lifetime, simplified, looks like this: when they are empty, they
596	will finish very quickly. If they contain only requests that are in the	812	will finish very quickly. If they contain only requests that are in the
597	C<done> state, they will also finish. Otherwise they will continue to	813	C<done> state, they will also finish. Otherwise they will continue to
598	exist.	814	exist.
599		815
		816	That means after creating a group you have some time to add requests. And
		817	in the callbacks of those requests, you can add further requests to the
		818	group. And only when all those requests have finished will the the group
		819	itself finish.
		820
600	=over 4	821	=over 4
601		822
		823	=item add $grp ...
		824
602	=item $grp->add (...)	825	=item $grp->add (...)
603		826
604	=item add $grp ...	827	Add one or more requests to the group. Any type of L<IO::AIO::REQ> can
		828	be added, including other groups, as long as you do not create circular
		829	dependencies.
605		830
606	Add one or more	831	Returns all its arguments.
607	Cancels the request, if possible. Has the effect of skipping execution	832
608	when entering the B<execute> state and skipping calling the callback when	833	=item $grp->cancel_subs
609	entering the the B<result> state, but will leave the request otherwise	834
610	untouched. That means that requests that currently execute will not be	835	Cancel all subrequests and clears any feeder, but not the group request
611	stopped and resources held by the request will not be freed prematurely.	836	itself. Useful when you queued a lot of events but got a result early.
		837
		838	=item $grp->result (...)
		839
		840	Set the result value(s) that will be passed to the group callback when all
		841	subrequests have finished and set thre groups errno to the current value
		842	of errno (just like calling C<errno> without an error number). By default,
		843	no argument will be passed and errno is zero.
		844
		845	=item $grp->errno ([$errno])
		846
		847	Sets the group errno value to C<$errno>, or the current value of errno
		848	when the argument is missing.
		849
		850	Every aio request has an associated errno value that is restored when
		851	the callback is invoked. This method lets you change this value from its
		852	default (0).
		853
		854	Calling C<result> will also set errno, so make sure you either set C<$!>
		855	before the call to C<result>, or call c<errno> after it.
		856
		857	=item feed $grp $callback->($grp)
		858
		859	Sets a feeder/generator on this group: every group can have an attached
		860	generator that generates requests if idle. The idea behind this is that,
		861	although you could just queue as many requests as you want in a group,
		862	this might starve other requests for a potentially long time. For
		863	example, C<aio_scandir> might generate hundreds of thousands C<aio_stat>
		864	requests, delaying any later requests for a long time.
		865
		866	To avoid this, and allow incremental generation of requests, you can
		867	instead a group and set a feeder on it that generates those requests. The
		868	feed callback will be called whenever there are few enough (see C<limit>,
		869	below) requests active in the group itself and is expected to queue more
		870	requests.
		871
		872	The feed callback can queue as many requests as it likes (i.e. C<add> does
		873	not impose any limits).
		874
		875	If the feed does not queue more requests when called, it will be
		876	automatically removed from the group.
		877
		878	If the feed limit is C<0>, it will be set to C<2> automatically.
		879
		880	Example:
		881
		882	# stat all files in @files, but only ever use four aio requests concurrently:
		883
		884	my $grp = aio_group sub { print "finished\n" };
		885	limit $grp 4;
		886	feed $grp sub {
		887	my $file = pop @files
		888	or return;
		889
		890	add $grp aio_stat $file, sub { ... };
		891	};
		892
		893	=item limit $grp $num
		894
		895	Sets the feeder limit for the group: The feeder will be called whenever
		896	the group contains less than this many requests.
		897
		898	Setting the limit to C<0> will pause the feeding process.
612		899
613	=back	900	=back
614		901
615	=head2 SUPPORT FUNCTIONS	902	=head2 SUPPORT FUNCTIONS
		903
		904	=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION
616		905
617	=over 4	906	=over 4
618		907
619	=item $fileno = IO::AIO::poll_fileno	908	=item $fileno = IO::AIO::poll_fileno
620		909
…		…
625		914
626	See C<poll_cb> for an example.	915	See C<poll_cb> for an example.
627		916
628	=item IO::AIO::poll_cb	917	=item IO::AIO::poll_cb
629		918
630	Process all outstanding events on the result pipe. You have to call this	919	Process some outstanding events on the result pipe. You have to call this
631	regularly. Returns the number of events processed. Returns immediately	920	regularly. Returns the number of events processed. Returns immediately
632	when no events are outstanding.	921	when no events are outstanding. The amount of events processed depends on
		922	the settings of C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>.
		923
		924	If not all requests were processed for whatever reason, the filehandle
		925	will still be ready when C<poll_cb> returns.
633		926
634	Example: Install an Event watcher that automatically calls	927	Example: Install an Event watcher that automatically calls
635	IO::AIO::poll_cb with high priority:	928	IO::AIO::poll_cb with high priority:
636		929
637	Event->io (fd => IO::AIO::poll_fileno,	930	Event->io (fd => IO::AIO::poll_fileno,
638	poll => 'r', async => 1,	931	poll => 'r', async => 1,
639	cb => \&IO::AIO::poll_cb);	932	cb => \&IO::AIO::poll_cb);
640		933
		934	=item IO::AIO::max_poll_reqs $nreqs
		935
		936	=item IO::AIO::max_poll_time $seconds
		937
		938	These set the maximum number of requests (default C<0>, meaning infinity)
		939	that are being processed by C<IO::AIO::poll_cb> in one call, respectively
		940	the maximum amount of time (default C<0>, meaning infinity) spent in
		941	C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount
		942	of time C<poll_cb> is allowed to use).
		943
		944	Setting these is useful if you want to ensure some level of
		945	interactiveness when perl is not fast enough to process all requests in
		946	time.
		947
		948	For interactive programs, values such as C<0.01> to C<0.1> should be fine.
		949
		950	Example: Install an Event watcher that automatically calls
		951	IO::AIO::poll_some with low priority, to ensure that other parts of the
		952	program get the CPU sometimes even under high AIO load.
		953
		954	# try not to spend much more than 0.1s in poll_cb
		955	IO::AIO::max_poll_time 0.1;
		956
		957	# use a low priority so other tasks have priority
		958	Event->io (fd => IO::AIO::poll_fileno,
		959	poll => 'r', nice => 1,
		960	cb => &IO::AIO::poll_cb);
		961
641	=item IO::AIO::poll_wait	962	=item IO::AIO::poll_wait
642		963
643	Wait till the result filehandle becomes ready for reading (simply does a	964	Wait till the result filehandle becomes ready for reading (simply does a
644	C<select> on the filehandle. This is useful if you want to synchronously wait	965	C<select> on the filehandle. This is useful if you want to synchronously
645	for some requests to finish).	966	wait for some requests to finish).
646		967
647	See C<nreqs> for an example.	968	See C<nreqs> for an example.
648		969
		970	=item IO::AIO::poll
		971
		972	Waits until some requests have been handled.
		973
		974	Strictly equivalent to:
		975
		976	IO::AIO::poll_wait, IO::AIO::poll_cb
		977	if IO::AIO::nreqs;
		978
649	=item IO::AIO::nreqs	979	=item IO::AIO::flush
650		980
651	Returns the number of requests currently outstanding (i.e. for which their	981	Wait till all outstanding AIO requests have been handled.
652	callback has not been invoked yet).
653		982
654	Example: wait till there are no outstanding requests anymore:	983	Strictly equivalent to:
655		984
656	IO::AIO::poll_wait, IO::AIO::poll_cb	985	IO::AIO::poll_wait, IO::AIO::poll_cb
657	while IO::AIO::nreqs;	986	while IO::AIO::nreqs;
658		987
659	=item IO::AIO::flush	988	=head3 CONTROLLING THE NUMBER OF THREADS
660
661	Wait till all outstanding AIO requests have been handled.
662
663	Strictly equivalent to:
664
665	IO::AIO::poll_wait, IO::AIO::poll_cb
666	while IO::AIO::nreqs;
667
668	=item IO::AIO::poll
669
670	Waits until some requests have been handled.
671
672	Strictly equivalent to:
673
674	IO::AIO::poll_wait, IO::AIO::poll_cb
675	if IO::AIO::nreqs;
676		989
677	=item IO::AIO::min_parallel $nthreads	990	=item IO::AIO::min_parallel $nthreads
678		991
679	Set the minimum number of AIO threads to C<$nthreads>. The current default	992	Set the minimum number of AIO threads to C<$nthreads>. The current
680	is C<4>, which means four asynchronous operations can be done at one time	993	default is C<8>, which means eight asynchronous operations can execute
681	(the number of outstanding operations, however, is unlimited).	994	concurrently at any one time (the number of outstanding requests,
		995	however, is unlimited).
682		996
683	IO::AIO starts threads only on demand, when an AIO request is queued and	997	IO::AIO starts threads only on demand, when an AIO request is queued and
684	no free thread exists.	998	no free thread exists. Please note that queueing up a hundred requests can
		999	create demand for a hundred threads, even if it turns out that everything
		1000	is in the cache and could have been processed faster by a single thread.
685		1001
686	It is recommended to keep the number of threads low, as some Linux	1002	It is recommended to keep the number of threads relatively low, as some
687	kernel versions will scale negatively with the number of threads (higher	1003	Linux kernel versions will scale negatively with the number of threads
688	parallelity => MUCH higher latency). With current Linux 2.6 versions, 4-32	1004	(higher parallelity => MUCH higher latency). With current Linux 2.6
689	threads should be fine.	1005	versions, 4-32 threads should be fine.
690		1006
691	Under most circumstances you don't need to call this function, as the	1007	Under most circumstances you don't need to call this function, as the
692	module selects a default that is suitable for low to moderate load.	1008	module selects a default that is suitable for low to moderate load.
693		1009
694	=item IO::AIO::max_parallel $nthreads	1010	=item IO::AIO::max_parallel $nthreads
…		…
703	This module automatically runs C<max_parallel 0> at program end, to ensure	1019	This module automatically runs C<max_parallel 0> at program end, to ensure
704	that all threads are killed and that there are no outstanding requests.	1020	that all threads are killed and that there are no outstanding requests.
705		1021
706	Under normal circumstances you don't need to call this function.	1022	Under normal circumstances you don't need to call this function.
707		1023
		1024	=item IO::AIO::max_idle $nthreads
		1025
		1026	Limit the number of threads (default: 4) that are allowed to idle (i.e.,
		1027	threads that did not get a request to process within 10 seconds). That
		1028	means if a thread becomes idle while C<$nthreads> other threads are also
		1029	idle, it will free its resources and exit.
		1030
		1031	This is useful when you allow a large number of threads (e.g. 100 or 1000)
		1032	to allow for extremely high load situations, but want to free resources
		1033	under normal circumstances (1000 threads can easily consume 30MB of RAM).
		1034
		1035	The default is probably ok in most situations, especially if thread
		1036	creation is fast. If thread creation is very slow on your system you might
		1037	want to use larger values.
		1038
708	=item $oldnreqs = IO::AIO::max_outstanding $nreqs	1039	=item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs
		1040
		1041	This is a very bad function to use in interactive programs because it
		1042	blocks, and a bad way to reduce concurrency because it is inexact: Better
		1043	use an C<aio_group> together with a feed callback.
709		1044
710	Sets the maximum number of outstanding requests to C<$nreqs>. If you	1045	Sets the maximum number of outstanding requests to C<$nreqs>. If you
711	try to queue up more than this number of requests, the caller will block until	1046	to queue up more than this number of requests, the next call to the
712	some requests have been handled.	1047	C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>)
		1048	function will block until the limit is no longer exceeded.
713		1049
714	The default is very large, so normally there is no practical limit. If you	1050	The default value is very large, so there is no practical limit on the
715	queue up many requests in a loop it often improves speed if you set	1051	number of outstanding requests.
716	this to a relatively low number, such as C<100>.
717		1052
718	Under normal circumstances you don't need to call this function.	1053	You can still queue as many requests as you want. Therefore,
		1054	C<max_oustsanding> is mainly useful in simple scripts (with low values) or
		1055	as a stop gap to shield against fatal memory overflow (with large values).
		1056
		1057	=head3 STATISTICAL INFORMATION
		1058
		1059	=item IO::AIO::nreqs
		1060
		1061	Returns the number of requests currently in the ready, execute or pending
		1062	states (i.e. for which their callback has not been invoked yet).
		1063
		1064	Example: wait till there are no outstanding requests anymore:
		1065
		1066	IO::AIO::poll_wait, IO::AIO::poll_cb
		1067	while IO::AIO::nreqs;
		1068
		1069	=item IO::AIO::nready
		1070
		1071	Returns the number of requests currently in the ready state (not yet
		1072	executed).
		1073
		1074	=item IO::AIO::npending
		1075
		1076	Returns the number of requests currently in the pending state (executed,
		1077	but not yet processed by poll_cb).
719		1078
720	=back	1079	=back
721		1080
722	=cut	1081	=cut
723		1082
…		…
735	or return undef;	1094	or return undef;
736		1095
737	*$sym	1096	*$sym
738	}	1097	}
739		1098
740	min_parallel 4;	1099	min_parallel 8;
741		1100
742	END {	1101	END {
743	max_parallel 0;	1102	min_parallel 1;
744	}	1103	flush;
		1104	};
745		1105
746	1;	1106	1;
747		1107
748	=head2 FORK BEHAVIOUR	1108	=head2 FORK BEHAVIOUR
749		1109
750	This module should do "the right thing" when the process using it forks:	1110	This module should do "the right thing" when the process using it forks:
751		1111
752	Before the fork, IO::AIO enters a quiescent state where no requests	1112	Before the fork, IO::AIO enters a quiescent state where no requests
753	can be added in other threads and no results will be processed. After	1113	can be added in other threads and no results will be processed. After
754	the fork the parent simply leaves the quiescent state and continues	1114	the fork the parent simply leaves the quiescent state and continues
755	request/result processing, while the child clears the request/result	1115	request/result processing, while the child frees the request/result queue
756	queue (so the requests started before the fork will only be handled in	1116	(so that the requests started before the fork will only be handled in the
757	the parent). Threads will be started on demand until the limit ste in the	1117	parent). Threads will be started on demand until the limit set in the
758	parent process has been reached again.	1118	parent process has been reached again.
759		1119
760	In short: the parent will, after a short pause, continue as if fork had	1120	In short: the parent will, after a short pause, continue as if fork had
761	not been called, while the child will act as if IO::AIO has not been used	1121	not been called, while the child will act as if IO::AIO has not been used
762	yet.	1122	yet.
763		1123
		1124	=head2 MEMORY USAGE
		1125
		1126	Per-request usage:
		1127
		1128	Each aio request uses - depending on your architecture - around 100-200
		1129	bytes of memory. In addition, stat requests need a stat buffer (possibly
		1130	a few hundred bytes), readdir requires a result buffer and so on. Perl
		1131	scalars and other data passed into aio requests will also be locked and
		1132	will consume memory till the request has entered the done state.
		1133
		1134	This is now awfully much, so queuing lots of requests is not usually a
		1135	problem.
		1136
		1137	Per-thread usage:
		1138
		1139	In the execution phase, some aio requests require more memory for
		1140	temporary buffers, and each thread requires a stack and other data
		1141	structures (usually around 16k-128k, depending on the OS).
		1142
		1143	=head1 KNOWN BUGS
		1144
		1145	Known bugs will be fixed in the next release.
		1146
764	=head1 SEE ALSO	1147	=head1 SEE ALSO
765		1148
766	L<Coro>, L<Linux::AIO> (obsolete).	1149	L<Coro::AIO>.
767		1150
768	=head1 AUTHOR	1151	=head1 AUTHOR
769		1152
770	Marc Lehmann <schmorp@schmorp.de>	1153	Marc Lehmann <schmorp@schmorp.de>
771	http://home.schmorp.de/	1154	http://home.schmorp.de/

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.55 by root, Sun Oct 22 00:49:29 2006 UTC vs. Revision 1.88 by root, Sun Oct 29 01:50:29 2006 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.55 by root, Sun Oct 22 00:49:29 2006 UTC vs.
Revision 1.88 by root, Sun Oct 29 01:50:29 2006 UTC