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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.1 by root, Sun Jul 10 17:07:44 2005 UTC vs.
Revision 1.89 by root, Sun Oct 29 11:03:18 2006 UTC

…		…
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
7	use IO::AIO;	7	use IO::AIO;
8		8
		9	aio_open "/etc/passwd", O_RDONLY, 0, sub {
		10	my ($fh) = @_;
		11	...
		12	};
		13
		14	aio_unlink "/tmp/file", sub { };
		15
		16	aio_read $fh, 30000, 1024, $buffer, 0, sub {
		17	$_[0] > 0 or die "read error: $!";
		18	};
		19
		20	# version 2+ has request and group objects
		21	use IO::AIO 2;
		22
		23	aioreq_pri 4; # give next request a very high priority
		24	my $req = aio_unlink "/tmp/file", sub { };
		25	$req->cancel; # cancel request if still in queue
		26
		27	my $grp = aio_group sub { print "all stats done\n" };
		28	add $grp aio_stat "..." for ...;
		29
		30	# AnyEvent integration
		31	open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!";
		32	my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb });
		33
		34	# Event integration
		35	Event->io (fd => IO::AIO::poll_fileno,
		36	poll => 'r',
		37	cb => \&IO::AIO::poll_cb);
		38
		39	# Glib/Gtk2 integration
		40	add_watch Glib::IO IO::AIO::poll_fileno,
		41	in => sub { IO::AIO::poll_cb; 1 };
		42
		43	# Tk integration
		44	Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "",
		45	readable => \&IO::AIO::poll_cb);
		46
		47	# Danga::Socket integration
		48	Danga::Socket->AddOtherFds (IO::AIO::poll_fileno =>
		49	\&IO::AIO::poll_cb);
		50
9	=head1 DESCRIPTION	51	=head1 DESCRIPTION
10		52
11	This module implements asynchronous I/O using whatever means your	53	This module implements asynchronous I/O using whatever means your
12	operating system supports. Currently, it falls back to Linux::AIO if that	54	operating system supports.
13	module is available, or uses pthreads to emulato aio functionality.
14		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
15	Currently, in this module a number of threads are started that execute	72	In this version, a number of threads are started that execute your
16	your read/writes and signal their completion. You don't need thread	73	requests and signal their completion. You don't need thread support
17	support in your libc or perl, and the threads created by this module will	74	in perl, and the threads created by this module will not be visible
18	not be visible to the pthreads library.	75	to perl. In the future, this module might make use of the native aio
		76	functions available on many operating systems. However, they are often
		77	not well-supported or restricted (GNU/Linux doesn't allow them on normal
		78	files currently, for example), and they would only support aio_read and
		79	aio_write, so the remaining functionality would have to be implemented
		80	using threads anyway.
19		81
20	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-)
21	not reentrant, so use appropriate locking yourself.	83	threads, it is currently not reentrant in any way, so use appropriate
		84	locking yourself, always call C<poll_cb> from within the same thread, or
		85	never call C<poll_cb> (or other C<aio_> functions) recursively.
22		86
23	=head2 API NOTES	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
		182
		183	=cut
		184
		185	package IO::AIO;
		186
		187	no warnings;
		188	use strict 'vars';
		189
		190	use base 'Exporter';
		191
		192	BEGIN {
		193	our $VERSION = '2.1';
		194
		195	our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat
		196	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink
		197	aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move
		198	aio_copy aio_group aio_nop aio_mknod);
		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);
		204
		205	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';
		206
		207	require XSLoader;
		208	XSLoader::load ("IO::AIO", $VERSION);
		209	}
		210
		211	=head1 FUNCTIONS
		212
		213	=head2 AIO REQUEST FUNCTIONS
24		214
25	All the C<aio_*> calls are more or less thin wrappers around the syscall	215	All the C<aio_*> calls are more or less thin wrappers around the syscall
26	with the same name (sans C<aio_>). The arguments are similar or identical,	216	with the same name (sans C<aio_>). The arguments are similar or identical,
27	and they all accept an additional C<$callback> argument which must be	217	and they all accept an additional (and optional) C<$callback> argument
28	a code reference. This code reference will get called with the syscall	218	which must be a code reference. This code reference will get called with
29	return code (e.g. most syscalls return C<-1> on error, unlike perl, which	219	the syscall return code (e.g. most syscalls return C<-1> on error, unlike
30	usually delivers "false") as it's sole argument when the given syscall has	220	perl, which usually delivers "false") as it's sole argument when the given
31	been executed asynchronously.	221	syscall has been executed asynchronously.
32		222
33	All functions that expect a filehandle will also accept a file descriptor.	223	All functions expecting a filehandle keep a copy of the filehandle
		224	internally until the request has finished.
34		225
		226	All functions return request objects of type L<IO::AIO::REQ> that allow
		227	further manipulation of those requests while they are in-flight.
		228
35	The filenames you pass to these routines I<must> be absolute. The reason	229	The pathnames you pass to these routines I<must> be absolute and
36	is that at the time the request is being executed, the current working	230	encoded as octets. The reason for the former is that at the time the
37	directory could have changed. Alternatively, you can make sure that you	231	request is being executed, the current working directory could have
38	never change the current working directory.	232	changed. Alternatively, you can make sure that you never change the
		233	current working directory anywhere in the program and then use relative
		234	paths.
		235
		236	To encode pathnames as octets, either make sure you either: a) always pass
		237	in filenames you got from outside (command line, readdir etc.) without
		238	tinkering, b) are ASCII or ISO 8859-1, c) use the Encode module and encode
		239	your pathnames to the locale (or other) encoding in effect in the user
		240	environment, d) use Glib::filename_from_unicode on unicode filenames or e)
		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.
39		245
40	=over 4	246	=over 4
41		247
42	=cut	248	=item $prev_pri = aioreq_pri [$pri]
43		249
44	package IO::AIO;	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.
45		252
46	use base 'Exporter';	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.
47		256
48	BEGIN {	257	The priority will be reset to C<0> after each call to one of the C<aio_*>
49	$VERSION = 0.1;	258	functions.
50		259
51	@EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink	260	Example: open a file with low priority, then read something from it with
52	aio_fsync aio_fdatasync aio_readahead);	261	higher priority so the read request is serviced before other low priority
53	@EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel nreqs);	262	open requests (potentially spamming the cache):
54		263
55	require XSLoader;	264	aioreq_pri -3;
56	XSLoader::load IO::AIO, $VERSION;	265	aio_open ..., sub {
57	}	266	return unless $_[0];
58		267
59	=item IO::AIO::min_parallel $nthreads	268	aioreq_pri -2;
		269	aio_read $_[0], ..., sub {
		270	...
		271	};
		272	};
60		273
61	Set the minimum number of AIO threads to C<$nthreads>. The default is	274	=item aioreq_nice $pri_adjust
62	C<1>, which means a single asynchronous operation can be done at one time
63	(the number of outstanding operations, however, is unlimited).
64		275
65	It is recommended to keep the number of threads low, as some linux	276	Similar to C<aioreq_pri>, but subtracts the given value from the current
66	kernel versions will scale negatively with the number of threads (higher	277	priority, so the effect is cumulative.
67	parallelity => MUCH higher latency).
68		278
69	Under normal circumstances you don't need to call this function, as this
70	module automatically starts a single async thread.
71
72	=item IO::AIO::max_parallel $nthreads
73
74	Sets the maximum number of AIO threads to C<$nthreads>. If more than
75	the specified number of threads are currently running, kill them. This
76	function blocks until the limit is reached.
77
78	This module automatically runs C<max_parallel 0> at program end, to ensure
79	that all threads are killed and that there are no outstanding requests.
80
81	Under normal circumstances you don't need to call this function.
82
83	=item $fileno = IO::AIO::poll_fileno
84
85	Return the I<request result pipe filehandle>. This filehandle must be
86	polled for reading by some mechanism outside this module (e.g. Event
87	or select, see below). If the pipe becomes readable you have to call
88	C<poll_cb> to check the results.
89
90	See C<poll_cb> for an example.
91
92	=item IO::AIO::poll_cb
93
94	Process all outstanding events on the result pipe. You have to call this
95	regularly. Returns the number of events processed. Returns immediately
96	when no events are outstanding.
97
98	You can use Event to multiplex, e.g.:
99
100	Event->io (fd => IO::AIO::poll_fileno,
101	poll => 'r', async => 1,
102	cb => \&IO::AIO::poll_cb);
103
104	=item IO::AIO::poll_wait
105
106	Wait till the result filehandle becomes ready for reading (simply does a
107	select on the filehandle. This is useful if you want to synchronously wait
108	for some requests to finish).
109
110	See C<nreqs> for an example.
111
112	=item IO::AIO::nreqs
113
114	Returns the number of requests currently outstanding.
115
116	Example: wait till there are no outstanding requests anymore:
117
118	IO::AIO::poll_wait, IO::AIO::poll_cb
119	while IO::AIO::nreqs;
120
121	=item aio_open $pathname, $flags, $mode, $callback	279	=item aio_open $pathname, $flags, $mode, $callback->($fh)
122		280
123	Asynchronously open or create a file and call the callback with the	281	Asynchronously open or create a file and call the callback with a newly
124	filedescriptor (NOT a perl filehandle, sorry for that, but watch out, this	282	created filehandle for the file.
125	might change in the future).
126		283
127	The pathname passed to C<aio_open> must be absolute. See API NOTES, above,	284	The pathname passed to C<aio_open> must be absolute. See API NOTES, above,
128	for an explanation.	285	for an explanation.
129		286
130	The C<$mode> argument is a bitmask. See the C<Fcntl> module for a	287	The C<$flags> argument is a bitmask. See the C<Fcntl> module for a
131	list. They are the same as used in C<sysopen>.	288	list. They are the same as used by C<sysopen>.
		289
		290	Likewise, C<$mode> specifies the mode of the newly created file, if it
		291	didn't exist and C<O_CREAT> has been given, just like perl's C<sysopen>,
		292	except that it is mandatory (i.e. use C<0> if you don't create new files,
		293	and C<0666> or C<0777> if you do).
132		294
133	Example:	295	Example:
134		296
135	aio_open "/etc/passwd", O_RDONLY, 0, sub {	297	aio_open "/etc/passwd", O_RDONLY, 0, sub {
136	if ($_[0] >= 0) {	298	if ($_[0]) {
137	open my $fh, "<&$_[0]"; # create a copy for perl
138	aio_close $_[0], sub { }; # close the aio handle
139	print "open successful, fh is $fh\n";	299	print "open successful, fh is $_[0]\n";
140	...	300	...
141	} else {	301	} else {
142	die "open failed: $!\n";	302	die "open failed: $!\n";
143	}	303	}
144	};	304	};
145		305
146	=item aio_close $fh, $callback	306	=item aio_close $fh, $callback->($status)
147		307
148	Asynchronously close a file and call the callback with the result code.	308	Asynchronously close a file and call the callback with the result
		309	code. I<WARNING:> although accepted, you should not pass in a perl
		310	filehandle here, as perl will likely close the file descriptor another
		311	time when the filehandle is destroyed. Normally, you can safely call perls
		312	C<close> or just let filehandles go out of scope.
149		313
		314	This is supposed to be a bug in the API, so that might change. It's
		315	therefore best to avoid this function.
		316
150	=item aio_read $fh,$offset,$length, $data,$dataoffset,$callback	317	=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
151		318
152	=item aio_write $fh,$offset,$length, $data,$dataoffset,$callback	319	=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
153		320
154	Reads or writes C<length> bytes from the specified C<fh> and C<offset>	321	Reads or writes C<length> bytes from the specified C<fh> and C<offset>
155	into the scalar given by C<data> and offset C<dataoffset> and calls the	322	into the scalar given by C<data> and offset C<dataoffset> and calls the
156	callback without the actual number of bytes read (or -1 on error, just	323	callback without the actual number of bytes read (or -1 on error, just
157	like the syscall).	324	like the syscall).
158		325
		326	The C<$data> scalar I<MUST NOT> be modified in any way while the request
		327	is outstanding. Modifying it can result in segfaults or WW3 (if the
		328	necessary/optional hardware is installed).
		329
159	Example: Read 15 bytes at offset 7 into scalar C<$buffer>, strating at	330	Example: Read 15 bytes at offset 7 into scalar C<$buffer>, starting at
160	offset C<0> within the scalar:	331	offset C<0> within the scalar:
161		332
162	aio_read $fh, 7, 15, $buffer, 0, sub {	333	aio_read $fh, 7, 15, $buffer, 0, sub {
163	$_[0] >= 0 or die "read error: $!";	334	$_[0] > 0 or die "read error: $!";
164	print "read <$buffer>\n";	335	print "read $_[0] bytes: <$buffer>\n";
165	};	336	};
166		337
		338	=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)
		339
		340	Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts
		341	reading at byte offset C<$in_offset>, and starts writing at the current
		342	file offset of C<$out_fh>. Because of that, it is not safe to issue more
		343	than one C<aio_sendfile> per C<$out_fh>, as they will interfere with each
		344	other.
		345
		346	This call tries to make use of a native C<sendfile> syscall to provide
		347	zero-copy operation. For this to work, C<$out_fh> should refer to a
		348	socket, and C<$in_fh> should refer to mmap'able file.
		349
		350	If the native sendfile call fails or is not implemented, it will be
		351	emulated, so you can call C<aio_sendfile> on any type of filehandle
		352	regardless of the limitations of the operating system.
		353
		354	Please note, however, that C<aio_sendfile> can read more bytes from
		355	C<$in_fh> than are written, and there is no way to find out how many
		356	bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only
		357	provides the number of bytes written to C<$out_fh>. Only if the result
		358	value equals C<$length> one can assume that C<$length> bytes have been
		359	read.
		360
167	=item aio_readahead $fh,$offset,$length, $callback	361	=item aio_readahead $fh,$offset,$length, $callback->($retval)
168		362
169	Asynchronously reads the specified byte range into the page cache, using
170	the C<readahead> syscall. If that syscall doesn't exist the status will be
171	C<-1> and C<$!> is set to ENOSYS.
172
173	readahead() populates the page cache with data from a file so that	363	C<aio_readahead> populates the page cache with data from a file so that
174	subsequent reads from that file will not block on disk I/O. The C<$offset>	364	subsequent reads from that file will not block on disk I/O. The C<$offset>
175	argument specifies the starting point from which data is to be read and	365	argument specifies the starting point from which data is to be read and
176	C<$length> specifies the number of bytes to be read. I/O is performed in	366	C<$length> specifies the number of bytes to be read. I/O is performed in
177	whole pages, so that offset is effectively rounded down to a page boundary	367	whole pages, so that offset is effectively rounded down to a page boundary
178	and bytes are read up to the next page boundary greater than or equal to	368	and bytes are read up to the next page boundary greater than or equal to
179	(off-set+length). aio_readahead() does not read beyond the end of the	369	(off-set+length). C<aio_readahead> does not read beyond the end of the
180	file. The current file offset of the file is left unchanged.	370	file. The current file offset of the file is left unchanged.
181		371
		372	If that syscall doesn't exist (likely if your OS isn't Linux) it will be
		373	emulated by simply reading the data, which would have a similar effect.
		374
182	=item aio_stat $fh_or_path, $callback	375	=item aio_stat $fh_or_path, $callback->($status)
183		376
184	=item aio_lstat $fh, $callback	377	=item aio_lstat $fh, $callback->($status)
185		378
186	Works like perl's C<stat> or C<lstat> in void context. The callback will	379	Works like perl's C<stat> or C<lstat> in void context. The callback will
187	be called after the stat and the results will be available using C<stat _>	380	be called after the stat and the results will be available using C<stat _>
188	or C<-s _> etc...	381	or C<-s _> etc...
189		382
…		…
199	aio_stat "/etc/passwd", sub {	392	aio_stat "/etc/passwd", sub {
200	$_[0] and die "stat failed: $!";	393	$_[0] and die "stat failed: $!";
201	print "size is ", -s _, "\n";	394	print "size is ", -s _, "\n";
202	};	395	};
203		396
204	=item aio_unlink $pathname, $callback	397	=item aio_unlink $pathname, $callback->($status)
205		398
206	Asynchronously unlink (delete) a file and call the callback with the	399	Asynchronously unlink (delete) a file and call the callback with the
207	result code.	400	result code.
208		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
		412	=item aio_link $srcpath, $dstpath, $callback->($status)
		413
		414	Asynchronously create a new link to the existing object at C<$srcpath> at
		415	the path C<$dstpath> and call the callback with the result code.
		416
		417	=item aio_symlink $srcpath, $dstpath, $callback->($status)
		418
		419	Asynchronously create a new symbolic link to the existing object at C<$srcpath> at
		420	the path C<$dstpath> and call the callback with the result code.
		421
		422	=item aio_rename $srcpath, $dstpath, $callback->($status)
		423
		424	Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as
		425	rename(2) and call the callback with the result code.
		426
		427	=item aio_rmdir $pathname, $callback->($status)
		428
		429	Asynchronously rmdir (delete) a directory and call the callback with the
		430	result code.
		431
		432	=item aio_readdir $pathname, $callback->($entries)
		433
		434	Unlike the POSIX call of the same name, C<aio_readdir> reads an entire
		435	directory (i.e. opendir + readdir + closedir). The entries will not be
		436	sorted, and will B<NOT> include the C<.> and C<..> entries.
		437
		438	The callback a single argument which is either C<undef> or an array-ref
		439	with the filenames.
		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
		543	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
		544
		545	Scans a directory (similar to C<aio_readdir>) but additionally tries to
		546	efficiently separate the entries of directory C<$path> into two sets of
		547	names, directories you can recurse into (directories), and ones you cannot
		548	recurse into (everything else, including symlinks to directories).
		549
		550	C<aio_scandir> is a composite request that creates of many sub requests_
		551	C<$maxreq> specifies the maximum number of outstanding aio requests that
		552	this function generates. If it is C<< <= 0 >>, then a suitable default
		553	will be chosen (currently 4).
		554
		555	On error, the callback is called without arguments, otherwise it receives
		556	two array-refs with path-relative entry names.
		557
		558	Example:
		559
		560	aio_scandir $dir, 0, sub {
		561	my ($dirs, $nondirs) = @_;
		562	print "real directories: @$dirs\n";
		563	print "everything else: @$nondirs\n";
		564	};
		565
		566	Implementation notes.
		567
		568	The C<aio_readdir> cannot be avoided, but C<stat()>'ing every entry can.
		569
		570	After reading the directory, the modification time, size etc. of the
		571	directory before and after the readdir is checked, and if they match (and
		572	isn't the current time), the link count will be used to decide how many
		573	entries are directories (if >= 2). Otherwise, no knowledge of the number
		574	of subdirectories will be assumed.
		575
		576	Then entries will be sorted into likely directories (everything without
		577	a non-initial dot currently) and likely non-directories (everything
		578	else). Then every entry plus an appended C</.> will be C<stat>'ed,
		579	likely directories first. If that succeeds, it assumes that the entry
		580	is a directory or a symlink to directory (which will be checked
		581	seperately). This is often faster than stat'ing the entry itself because
		582	filesystems might detect the type of the entry without reading the inode
		583	data (e.g. ext2fs filetype feature).
		584
		585	If the known number of directories (link count - 2) has been reached, the
		586	rest of the entries is assumed to be non-directories.
		587
		588	This only works with certainty on POSIX (= UNIX) filesystems, which
		589	fortunately are the vast majority of filesystems around.
		590
		591	It will also likely work on non-POSIX filesystems with reduced efficiency
		592	as those tend to return 0 or 1 as link counts, which disables the
		593	directory counting heuristic.
		594
		595	=cut
		596
		597	sub aio_scandir($$$) {
		598	my ($path, $maxreq, $cb) = @_;
		599
		600	my $pri = aioreq_pri;
		601
		602	my $grp = aio_group $cb;
		603
		604	$maxreq = 4 if $maxreq <= 0;
		605
		606	# stat once
		607	aioreq_pri $pri;
		608	add $grp aio_stat $path, sub {
		609	return $grp->result () if $_[0];
		610	my $now = time;
		611	my $hash1 = join ":", (stat _)[0,1,3,7,9];
		612
		613	# read the directory entries
		614	aioreq_pri $pri;
		615	add $grp aio_readdir $path, sub {
		616	my $entries = shift
		617	or return $grp->result ();
		618
		619	# stat the dir another time
		620	aioreq_pri $pri;
		621	add $grp aio_stat $path, sub {
		622	my $hash2 = join ":", (stat _)[0,1,3,7,9];
		623
		624	my $ndirs;
		625
		626	# take the slow route if anything looks fishy
		627	if ($hash1 ne $hash2 or (stat _)[9] == $now) {
		628	$ndirs = -1;
		629	} else {
		630	# if nlink == 2, we are finished
		631	# on non-posix-fs's, we rely on nlink < 2
		632	$ndirs = (stat _)[3] - 2
		633	or return $grp->result ([], $entries);
		634	}
		635
		636	# sort into likely dirs and likely nondirs
		637	# dirs == files without ".", short entries first
		638	$entries = [map $_->[0],
		639	sort { $b->[1] cmp $a->[1] }
		640	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
		641	@$entries];
		642
		643	my (@dirs, @nondirs);
		644
		645	my $statgrp = add $grp aio_group sub {
		646	$grp->result (\@dirs, \@nondirs);
		647	};
		648
		649	limit $statgrp $maxreq;
		650	feed $statgrp sub {
		651	return unless @$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	}
		672	}
		673	}
		674	};
		675	};
		676	};
		677	};
		678	};
		679
		680	$grp
		681	}
		682
209	=item aio_fsync $fh, $callback	683	=item aio_fsync $fh, $callback->($status)
210		684
211	Asynchronously call fsync on the given filehandle and call the callback	685	Asynchronously call fsync on the given filehandle and call the callback
212	with the fsync result code.	686	with the fsync result code.
213		687
214	=item aio_fdatasync $fh, $callback	688	=item aio_fdatasync $fh, $callback->($status)
215		689
216	Asynchronously call fdatasync on the given filehandle and call the	690	Asynchronously call fdatasync on the given filehandle and call the
217	callback with the fdatasync result code.	691	callback with the fdatasync result code.
218		692
		693	If this call isn't available because your OS lacks it or it couldn't be
		694	detected, it will be emulated by calling C<fsync> instead.
		695
		696	=item aio_group $callback->(...)
		697
		698	This is a very special aio request: Instead of doing something, it is a
		699	container for other aio requests, which is useful if you want to bundle
		700	many requests into a single, composite, request with a definite callback
		701	and the ability to cancel the whole request with its subrequests.
		702
		703	Returns an object of class L<IO::AIO::GRP>. See its documentation below
		704	for more info.
		705
		706	Example:
		707
		708	my $grp = aio_group sub {
		709	print "all stats done\n";
		710	};
		711
		712	add $grp
		713	(aio_stat ...),
		714	(aio_stat ...),
		715	...;
		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
		730	=item IO::AIO::aio_busy $fractional_seconds, $callback->() NOT EXPORTED
		731
		732	Mainly used for debugging and benchmarking, this aio request puts one of
		733	the request workers to sleep for the given time.
		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
		740	=back
		741
		742	=head2 IO::AIO::REQ CLASS
		743
		744	All non-aggregate C<aio_*> functions return an object of this class when
		745	called in non-void context.
		746
		747	=over 4
		748
		749	=item cancel $req
		750
		751	Cancels the request, if possible. Has the effect of skipping execution
		752	when entering the B<execute> state and skipping calling the callback when
		753	entering the the B<result> state, but will leave the request otherwise
		754	untouched. That means that requests that currently execute will not be
		755	stopped and resources held by the request will not be freed prematurely.
		756
		757	=item cb $req $callback->(...)
		758
		759	Replace (or simply set) the callback registered to the request.
		760
		761	=back
		762
		763	=head2 IO::AIO::GRP CLASS
		764
		765	This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to
		766	objects of this class, too.
		767
		768	A IO::AIO::GRP object is a special request that can contain multiple other
		769	aio requests.
		770
		771	You create one by calling the C<aio_group> constructing function with a
		772	callback that will be called when all contained requests have entered the
		773	C<done> state:
		774
		775	my $grp = aio_group sub {
		776	print "all requests are done\n";
		777	};
		778
		779	You add requests by calling the C<add> method with one or more
		780	C<IO::AIO::REQ> objects:
		781
		782	$grp->add (aio_unlink "...");
		783
		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	};
		792
		793	This makes it very easy to create composite requests (see the source of
		794	C<aio_move> for an application) that work and feel like simple requests.
		795
		796	=over 4
		797
		798	=item * The IO::AIO::GRP objects will be cleaned up during calls to
		799	C<IO::AIO::poll_cb>, just like any other request.
		800
		801	=item * They can be canceled like any other request. Canceling will cancel not
		802	only the request itself, but also all requests it contains.
		803
		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
		810
		811	Their lifetime, simplified, looks like this: when they are empty, they
		812	will finish very quickly. If they contain only requests that are in the
		813	C<done> state, they will also finish. Otherwise they will continue to
		814	exist.
		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
		821	=over 4
		822
		823	=item add $grp ...
		824
		825	=item $grp->add (...)
		826
		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.
		830
		831	Returns all its arguments.
		832
		833	=item $grp->cancel_subs
		834
		835	Cancel all subrequests and clears any feeder, but not the group request
		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.
		899
		900	=back
		901
		902	=head2 SUPPORT FUNCTIONS
		903
		904	=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION
		905
		906	=over 4
		907
		908	=item $fileno = IO::AIO::poll_fileno
		909
		910	Return the I<request result pipe file descriptor>. This filehandle must be
		911	polled for reading by some mechanism outside this module (e.g. Event or
		912	select, see below or the SYNOPSIS). If the pipe becomes readable you have
		913	to call C<poll_cb> to check the results.
		914
		915	See C<poll_cb> for an example.
		916
		917	=item IO::AIO::poll_cb
		918
		919	Process some outstanding events on the result pipe. You have to call this
		920	regularly. Returns the number of events processed. Returns immediately
		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.
		926
		927	Example: Install an Event watcher that automatically calls
		928	IO::AIO::poll_cb with high priority:
		929
		930	Event->io (fd => IO::AIO::poll_fileno,
		931	poll => 'r', async => 1,
		932	cb => \&IO::AIO::poll_cb);
		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 C<max_poll_time> to a non-zero value creates an overhead of one
		945	syscall per request processed, which is not normally a problem unless your
		946	callbacks are really really fast or your OS is really really slow (I am
		947	not mentioning Solaris here). Using C<max_poll_reqs> incurs no overhead.
		948
		949	Setting these is useful if you want to ensure some level of
		950	interactiveness when perl is not fast enough to process all requests in
		951	time.
		952
		953	For interactive programs, values such as C<0.01> to C<0.1> should be fine.
		954
		955	Example: Install an Event watcher that automatically calls
		956	IO::AIO::poll_cb with low priority, to ensure that other parts of the
		957	program get the CPU sometimes even under high AIO load.
		958
		959	# try not to spend much more than 0.1s in poll_cb
		960	IO::AIO::max_poll_time 0.1;
		961
		962	# use a low priority so other tasks have priority
		963	Event->io (fd => IO::AIO::poll_fileno,
		964	poll => 'r', nice => 1,
		965	cb => &IO::AIO::poll_cb);
		966
		967	=item IO::AIO::poll_wait
		968
		969	Wait till the result filehandle becomes ready for reading (simply does a
		970	C<select> on the filehandle. This is useful if you want to synchronously
		971	wait for some requests to finish).
		972
		973	See C<nreqs> for an example.
		974
		975	=item IO::AIO::poll
		976
		977	Waits until some requests have been handled.
		978
		979	Strictly equivalent to:
		980
		981	IO::AIO::poll_wait, IO::AIO::poll_cb
		982	if IO::AIO::nreqs;
		983
		984	=item IO::AIO::flush
		985
		986	Wait till all outstanding AIO requests have been handled.
		987
		988	Strictly equivalent to:
		989
		990	IO::AIO::poll_wait, IO::AIO::poll_cb
		991	while IO::AIO::nreqs;
		992
		993	=head3 CONTROLLING THE NUMBER OF THREADS
		994
		995	=item IO::AIO::min_parallel $nthreads
		996
		997	Set the minimum number of AIO threads to C<$nthreads>. The current
		998	default is C<8>, which means eight asynchronous operations can execute
		999	concurrently at any one time (the number of outstanding requests,
		1000	however, is unlimited).
		1001
		1002	IO::AIO starts threads only on demand, when an AIO request is queued and
		1003	no free thread exists. Please note that queueing up a hundred requests can
		1004	create demand for a hundred threads, even if it turns out that everything
		1005	is in the cache and could have been processed faster by a single thread.
		1006
		1007	It is recommended to keep the number of threads relatively low, as some
		1008	Linux kernel versions will scale negatively with the number of threads
		1009	(higher parallelity => MUCH higher latency). With current Linux 2.6
		1010	versions, 4-32 threads should be fine.
		1011
		1012	Under most circumstances you don't need to call this function, as the
		1013	module selects a default that is suitable for low to moderate load.
		1014
		1015	=item IO::AIO::max_parallel $nthreads
		1016
		1017	Sets the maximum number of AIO threads to C<$nthreads>. If more than the
		1018	specified number of threads are currently running, this function kills
		1019	them. This function blocks until the limit is reached.
		1020
		1021	While C<$nthreads> are zero, aio requests get queued but not executed
		1022	until the number of threads has been increased again.
		1023
		1024	This module automatically runs C<max_parallel 0> at program end, to ensure
		1025	that all threads are killed and that there are no outstanding requests.
		1026
		1027	Under normal circumstances you don't need to call this function.
		1028
		1029	=item IO::AIO::max_idle $nthreads
		1030
		1031	Limit the number of threads (default: 4) that are allowed to idle (i.e.,
		1032	threads that did not get a request to process within 10 seconds). That
		1033	means if a thread becomes idle while C<$nthreads> other threads are also
		1034	idle, it will free its resources and exit.
		1035
		1036	This is useful when you allow a large number of threads (e.g. 100 or 1000)
		1037	to allow for extremely high load situations, but want to free resources
		1038	under normal circumstances (1000 threads can easily consume 30MB of RAM).
		1039
		1040	The default is probably ok in most situations, especially if thread
		1041	creation is fast. If thread creation is very slow on your system you might
		1042	want to use larger values.
		1043
		1044	=item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs
		1045
		1046	This is a very bad function to use in interactive programs because it
		1047	blocks, and a bad way to reduce concurrency because it is inexact: Better
		1048	use an C<aio_group> together with a feed callback.
		1049
		1050	Sets the maximum number of outstanding requests to C<$nreqs>. If you
		1051	to queue up more than this number of requests, the next call to the
		1052	C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>)
		1053	function will block until the limit is no longer exceeded.
		1054
		1055	The default value is very large, so there is no practical limit on the
		1056	number of outstanding requests.
		1057
		1058	You can still queue as many requests as you want. Therefore,
		1059	C<max_oustsanding> is mainly useful in simple scripts (with low values) or
		1060	as a stop gap to shield against fatal memory overflow (with large values).
		1061
		1062	=head3 STATISTICAL INFORMATION
		1063
		1064	=item IO::AIO::nreqs
		1065
		1066	Returns the number of requests currently in the ready, execute or pending
		1067	states (i.e. for which their callback has not been invoked yet).
		1068
		1069	Example: wait till there are no outstanding requests anymore:
		1070
		1071	IO::AIO::poll_wait, IO::AIO::poll_cb
		1072	while IO::AIO::nreqs;
		1073
		1074	=item IO::AIO::nready
		1075
		1076	Returns the number of requests currently in the ready state (not yet
		1077	executed).
		1078
		1079	=item IO::AIO::npending
		1080
		1081	Returns the number of requests currently in the pending state (executed,
		1082	but not yet processed by poll_cb).
		1083
		1084	=back
		1085
219	=cut	1086	=cut
220		1087
		1088	# support function to convert a fd into a perl filehandle
		1089	sub _fd2fh {
		1090	return undef if $_[0] < 0;
		1091
		1092	# try to generate nice filehandles
		1093	my $sym = "IO::AIO::fd#$_[0]";
		1094	local *$sym;
		1095
		1096	open *$sym, "+<&=$_[0]" # usually works under any unix
		1097	or open *$sym, "<&=$_[0]" # cygwin needs this
		1098	or open *$sym, ">&=$_[0]" # or this
		1099	or return undef;
		1100
		1101	*$sym
		1102	}
		1103
221	min_parallel 4;	1104	min_parallel 8;
222		1105
223	END {	1106	END {
224	max_parallel 0;	1107	min_parallel 1;
225	}	1108	flush;
		1109	};
226		1110
227	1;	1111	1;
228		1112
229	=back	1113	=head2 FORK BEHAVIOUR
230		1114
		1115	This module should do "the right thing" when the process using it forks:
		1116
		1117	Before the fork, IO::AIO enters a quiescent state where no requests
		1118	can be added in other threads and no results will be processed. After
		1119	the fork the parent simply leaves the quiescent state and continues
		1120	request/result processing, while the child frees the request/result queue
		1121	(so that the requests started before the fork will only be handled in the
		1122	parent). Threads will be started on demand until the limit set in the
		1123	parent process has been reached again.
		1124
		1125	In short: the parent will, after a short pause, continue as if fork had
		1126	not been called, while the child will act as if IO::AIO has not been used
		1127	yet.
		1128
		1129	=head2 MEMORY USAGE
		1130
		1131	Per-request usage:
		1132
		1133	Each aio request uses - depending on your architecture - around 100-200
		1134	bytes of memory. In addition, stat requests need a stat buffer (possibly
		1135	a few hundred bytes), readdir requires a result buffer and so on. Perl
		1136	scalars and other data passed into aio requests will also be locked and
		1137	will consume memory till the request has entered the done state.
		1138
		1139	This is now awfully much, so queuing lots of requests is not usually a
		1140	problem.
		1141
		1142	Per-thread usage:
		1143
		1144	In the execution phase, some aio requests require more memory for
		1145	temporary buffers, and each thread requires a stack and other data
		1146	structures (usually around 16k-128k, depending on the OS).
		1147
231	=head1 BUGS	1148	=head1 KNOWN BUGS
232		1149
233	- aio_open gives a fd, but all other functions expect a perl filehandle.	1150	Known bugs will be fixed in the next release.
234		1151
235	=head1 SEE ALSO	1152	=head1 SEE ALSO
236		1153
237	L<Coro>, L<Linux::AIO>.	1154	L<Coro::AIO>.
238		1155
239	=head1 AUTHOR	1156	=head1 AUTHOR
240		1157
241	Marc Lehmann <schmorp@schmorp.de>	1158	Marc Lehmann <schmorp@schmorp.de>
242	http://home.schmorp.de/	1159	http://home.schmorp.de/

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.1 by root, Sun Jul 10 17:07:44 2005 UTC vs. Revision 1.89 by root, Sun Oct 29 11:03:18 2006 UTC

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Comparing IO-AIO/AIO.pm (file contents):
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Revision 1.89 by root, Sun Oct 29 11:03:18 2006 UTC