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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.63 by root, Mon Oct 23 00:34:36 2006 UTC vs.
Revision 1.92 by root, Wed Nov 8 01:57:42 2006 UTC

…		…
18	};	18	};
19		19
20	# version 2+ has request and group objects	20	# version 2+ has request and group objects
21	use IO::AIO 2;	21	use IO::AIO 2;
22		22
		23	aioreq_pri 4; # give next request a very high priority
23	my $req = aio_unlink "/tmp/file", sub { };	24	my $req = aio_unlink "/tmp/file", sub { };
24	$req->cancel; # cancel request if still in queue	25	$req->cancel; # cancel request if still in queue
25		26
26	my $grp = aio_group sub { print "all stats done\n" };	27	my $grp = aio_group sub { print "all stats done\n" };
27	add $grp aio_stat "..." for ...;	28	add $grp aio_stat "..." for ...;
…		…
50	=head1 DESCRIPTION	51	=head1 DESCRIPTION
51		52
52	This module implements asynchronous I/O using whatever means your	53	This module implements asynchronous I/O using whatever means your
53	operating system supports.	54	operating system supports.
54		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 most of this works on all types of file descriptors (for example
		67	sockets), using these functions on file descriptors that support
		68	nonblocking operation (again, sockets, pipes etc.) is very inefficient or
		69	might not work (aio_read fails on sockets/pipes/fifos). Use an event loop
		70	for that (such as the L<Event\|Event> module): IO::AIO will naturally fit
		71	into such an event loop itself.
		72
55	Currently, a number of threads are started that execute your read/writes	73	In this version, a number of threads are started that execute your
56	and signal their completion. You don't need thread support in your libc or	74	requests and signal their completion. You don't need thread support
57	perl, and the threads created by this module will not be visible to the	75	in perl, and the threads created by this module will not be visible
58	pthreads library. In the future, this module might make use of the native	76	to perl. In the future, this module might make use of the native aio
59	aio functions available on many operating systems. However, they are often	77	functions available on many operating systems. However, they are often
60	not well-supported (Linux doesn't allow them on normal files currently,	78	not well-supported or restricted (GNU/Linux doesn't allow them on normal
61	for example), and they would only support aio_read and aio_write, so the	79	files currently, for example), and they would only support aio_read and
62	remaining functionality would have to be implemented using threads anyway.	80	aio_write, so the remaining functionality would have to be implemented
		81	using threads anyway.
63		82
64	Although the module will work with in the presence of other threads, it is	83	Although the module will work with in the presence of other (Perl-)
65	currently not reentrant, so use appropriate locking yourself, always call	84	threads, it is currently not reentrant in any way, so use appropriate
66	C<poll_cb> from within the same thread, or never call C<poll_cb> (or other	85	locking yourself, always call C<poll_cb> from within the same thread, or
67	C<aio_> functions) recursively.	86	never call C<poll_cb> (or other C<aio_> functions) recursively.
		87
		88	=head2 EXAMPLE
		89
		90	This is a simple example that uses the Event module and loads
		91	F</etc/passwd> asynchronously:
		92
		93	use Fcntl;
		94	use Event;
		95	use IO::AIO;
		96
		97	# register the IO::AIO callback with Event
		98	Event->io (fd => IO::AIO::poll_fileno,
		99	poll => 'r',
		100	cb => \&IO::AIO::poll_cb);
		101
		102	# queue the request to open /etc/passwd
		103	aio_open "/etc/passwd", O_RDONLY, 0, sub {
		104	my $fh = $_[0]
		105	or die "error while opening: $!";
		106
		107	# stat'ing filehandles is generally non-blocking
		108	my $size = -s $fh;
		109
		110	# queue a request to read the file
		111	my $contents;
		112	aio_read $fh, 0, $size, $contents, 0, sub {
		113	$_[0] == $size
		114	or die "short read: $!";
		115
		116	close $fh;
		117
		118	# file contents now in $contents
		119	print $contents;
		120
		121	# exit event loop and program
		122	Event::unloop;
		123	};
		124	};
		125
		126	# possibly queue up other requests, or open GUI windows,
		127	# check for sockets etc. etc.
		128
		129	# process events as long as there are some:
		130	Event::loop;
		131
		132	=head1 REQUEST ANATOMY AND LIFETIME
		133
		134	Every C<aio_*> function creates a request. which is a C data structure not
		135	directly visible to Perl.
		136
		137	If called in non-void context, every request function returns a Perl
		138	object representing the request. In void context, nothing is returned,
		139	which saves a bit of memory.
		140
		141	The perl object is a fairly standard ref-to-hash object. The hash contents
		142	are not used by IO::AIO so you are free to store anything you like in it.
		143
		144	During their existance, aio requests travel through the following states,
		145	in order:
		146
		147	=over 4
		148
		149	=item ready
		150
		151	Immediately after a request is created it is put into the ready state,
		152	waiting for a thread to execute it.
		153
		154	=item execute
		155
		156	A thread has accepted the request for processing and is currently
		157	executing it (e.g. blocking in read).
		158
		159	=item pending
		160
		161	The request has been executed and is waiting for result processing.
		162
		163	While request submission and execution is fully asynchronous, result
		164	processing is not and relies on the perl interpreter calling C<poll_cb>
		165	(or another function with the same effect).
		166
		167	=item result
		168
		169	The request results are processed synchronously by C<poll_cb>.
		170
		171	The C<poll_cb> function will process all outstanding aio requests by
		172	calling their callbacks, freeing memory associated with them and managing
		173	any groups they are contained in.
		174
		175	=item done
		176
		177	Request has reached the end of its lifetime and holds no resources anymore
		178	(except possibly for the Perl object, but its connection to the actual
		179	aio request is severed and calling its methods will either do nothing or
		180	result in a runtime error).
		181
		182	=back
68		183
69	=cut	184	=cut
70		185
71	package IO::AIO;	186	package IO::AIO;
72		187
…		…
74	use strict 'vars';	189	use strict 'vars';
75		190
76	use base 'Exporter';	191	use base 'Exporter';
77		192
78	BEGIN {	193	BEGIN {
79	our $VERSION = '2.0';	194	our $VERSION = '2.2';
80		195
81	our @EXPORT = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat	196	our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat
82	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink	197	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink
83	aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move	198	aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link
84	aio_group aio_nop);	199	aio_move aio_copy aio_group aio_nop aio_mknod);
85	our @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs);	200	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));
		201	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
		202	min_parallel max_parallel max_idle
		203	nreqs nready npending nthreads
		204	max_poll_time max_poll_reqs);
86		205
87	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';	206	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';
88		207
89	require XSLoader;	208	require XSLoader;
90	XSLoader::load ("IO::AIO", $VERSION);	209	XSLoader::load ("IO::AIO", $VERSION);
91	}	210	}
92		211
93	=head1 FUNCTIONS	212	=head1 FUNCTIONS
94		213
95	=head2 AIO FUNCTIONS	214	=head2 AIO REQUEST FUNCTIONS
96		215
97	All the C<aio_*> calls are more or less thin wrappers around the syscall	216	All the C<aio_*> calls are more or less thin wrappers around the syscall
98	with the same name (sans C<aio_>). The arguments are similar or identical,	217	with the same name (sans C<aio_>). The arguments are similar or identical,
99	and they all accept an additional (and optional) C<$callback> argument	218	and they all accept an additional (and optional) C<$callback> argument
100	which must be a code reference. This code reference will get called with	219	which must be a code reference. This code reference will get called with
…		…
103	syscall has been executed asynchronously.	222	syscall has been executed asynchronously.
104		223
105	All functions expecting a filehandle keep a copy of the filehandle	224	All functions expecting a filehandle keep a copy of the filehandle
106	internally until the request has finished.	225	internally until the request has finished.
107		226
108	All requests return objects of type L<IO::AIO::REQ> that allow further	227	All functions return request objects of type L<IO::AIO::REQ> that allow
109	manipulation of those requests while they are in-flight.	228	further manipulation of those requests while they are in-flight.
110		229
111	The pathnames you pass to these routines I<must> be absolute and	230	The pathnames you pass to these routines I<must> be absolute and
112	encoded in byte form. The reason for the former is that at the time the	231	encoded as octets. The reason for the former is that at the time the
113	request is being executed, the current working directory could have	232	request is being executed, the current working directory could have
114	changed. Alternatively, you can make sure that you never change the	233	changed. Alternatively, you can make sure that you never change the
115	current working directory.	234	current working directory anywhere in the program and then use relative
		235	paths.
116		236
117	To encode pathnames to byte form, either make sure you either: a)	237	To encode pathnames as octets, either make sure you either: a) always pass
118	always pass in filenames you got from outside (command line, readdir	238	in filenames you got from outside (command line, readdir etc.) without
119	etc.), b) are ASCII or ISO 8859-1, c) use the Encode module and encode	239	tinkering, b) are ASCII or ISO 8859-1, c) use the Encode module and encode
120	your pathnames to the locale (or other) encoding in effect in the user	240	your pathnames to the locale (or other) encoding in effect in the user
121	environment, d) use Glib::filename_from_unicode on unicode filenames or e)	241	environment, d) use Glib::filename_from_unicode on unicode filenames or e)
122	use something else.	242	use something else to ensure your scalar has the correct contents.
		243
		244	This works, btw. independent of the internal UTF-8 bit, which IO::AIO
		245	handles correctly wether it is set or not.
123		246
124	=over 4	247	=over 4
		248
		249	=item $prev_pri = aioreq_pri [$pri]
		250
		251	Returns the priority value that would be used for the next request and, if
		252	C<$pri> is given, sets the priority for the next aio request.
		253
		254	The default priority is C<0>, the minimum and maximum priorities are C<-4>
		255	and C<4>, respectively. Requests with higher priority will be serviced
		256	first.
		257
		258	The priority will be reset to C<0> after each call to one of the C<aio_*>
		259	functions.
		260
		261	Example: open a file with low priority, then read something from it with
		262	higher priority so the read request is serviced before other low priority
		263	open requests (potentially spamming the cache):
		264
		265	aioreq_pri -3;
		266	aio_open ..., sub {
		267	return unless $_[0];
		268
		269	aioreq_pri -2;
		270	aio_read $_[0], ..., sub {
		271	...
		272	};
		273	};
		274
		275	=item aioreq_nice $pri_adjust
		276
		277	Similar to C<aioreq_pri>, but subtracts the given value from the current
		278	priority, so the effect is cumulative.
125		279
126	=item aio_open $pathname, $flags, $mode, $callback->($fh)	280	=item aio_open $pathname, $flags, $mode, $callback->($fh)
127		281
128	Asynchronously open or create a file and call the callback with a newly	282	Asynchronously open or create a file and call the callback with a newly
129	created filehandle for the file.	283	created filehandle for the file.
…		…
179		333
180	aio_read $fh, 7, 15, $buffer, 0, sub {	334	aio_read $fh, 7, 15, $buffer, 0, sub {
181	$_[0] > 0 or die "read error: $!";	335	$_[0] > 0 or die "read error: $!";
182	print "read $_[0] bytes: <$buffer>\n";	336	print "read $_[0] bytes: <$buffer>\n";
183	};	337	};
184
185	=item aio_move $srcpath, $dstpath, $callback->($status)
186
187	[EXPERIMENTAL due to internal aio_group use]
188
189	Try to move the I<file> (directories not supported as either source or
190	destination) from C<$srcpath> to C<$dstpath> and call the callback with
191	the C<0> (error) or C<-1> ok.
192
193	This is a composite request that tries to rename(2) the file first. If
194	rename files with C<EXDEV>, it creates the destination file with mode 0200
195	and copies the contents of the source file into it using C<aio_sendfile>,
196	followed by restoring atime, mtime, access mode and uid/gid, in that
197	order, and unlinking the C<$srcpath>.
198
199	If an error occurs, the partial destination file will be unlinked, if
200	possible, except when setting atime, mtime, access mode and uid/gid, where
201	errors are being ignored.
202
203	=cut
204
205	sub aio_move($$$) {
206	my ($src, $dst, $cb) = @_;
207
208	my $grp = aio_group $cb;
209
210	add $grp aio_rename $src, $dst, sub {
211	if ($_[0] && $! == EXDEV) {
212	add $grp aio_open $src, O_RDONLY, 0, sub {
213	if (my $src_fh = $_[0]) {
214	my @stat = stat $src_fh;
215
216	add $grp aio_open $dst, O_WRONLY, 0200, sub {
217	if (my $dst_fh = $_[0]) {
218	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
219	close $src_fh;
220
221	if ($_[0] == $stat[7]) {
222	utime $stat[8], $stat[9], $dst;
223	chmod $stat[2] & 07777, $dst_fh;
224	chown $stat[4], $stat[5], $dst_fh;
225	close $dst_fh;
226
227	add $grp aio_unlink $src, sub {
228	$grp->result ($_[0]);
229	};
230	} else {
231	my $errno = $!;
232	add $grp aio_unlink $dst, sub {
233	$! = $errno;
234	$grp->result (-1);
235	};
236	}
237	};
238	} else {
239	$grp->result (-1);
240	}
241	},
242
243	} else {
244	$grp->result (-1);
245	}
246	};
247	} else {
248	$grp->result ($_[0]);
249	}
250	};
251
252	$grp
253	}
254		338
255	=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)	339	=item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)
256		340
257	Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts	341	Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts
258	reading at byte offset C<$in_offset>, and starts writing at the current	342	reading at byte offset C<$in_offset>, and starts writing at the current
…		…
314	=item aio_unlink $pathname, $callback->($status)	398	=item aio_unlink $pathname, $callback->($status)
315		399
316	Asynchronously unlink (delete) a file and call the callback with the	400	Asynchronously unlink (delete) a file and call the callback with the
317	result code.	401	result code.
318		402
		403	=item aio_mknod $path, $mode, $dev, $callback->($status)
		404
		405	[EXPERIMENTAL]
		406
		407	Asynchronously create a device node (or fifo). See mknod(2).
		408
		409	The only (POSIX-) portable way of calling this function is:
		410
		411	aio_mknod $path, IO::AIO::S_IFIFO \| $mode, 0, sub { ...
		412
319	=item aio_link $srcpath, $dstpath, $callback->($status)	413	=item aio_link $srcpath, $dstpath, $callback->($status)
320		414
321	Asynchronously create a new link to the existing object at C<$srcpath> at	415	Asynchronously create a new link to the existing object at C<$srcpath> at
322	the path C<$dstpath> and call the callback with the result code.	416	the path C<$dstpath> and call the callback with the result code.
323		417
324	=item aio_symlink $srcpath, $dstpath, $callback->($status)	418	=item aio_symlink $srcpath, $dstpath, $callback->($status)
325		419
326	Asynchronously create a new symbolic link to the existing object at C<$srcpath> at	420	Asynchronously create a new symbolic link to the existing object at C<$srcpath> at
327	the path C<$dstpath> and call the callback with the result code.	421	the path C<$dstpath> and call the callback with the result code.
		422
		423	=item aio_readlink $path, $callback->($link)
		424
		425	Asynchronously read the symlink specified by C<$path> and pass it to
		426	the callback. If an error occurs, nothing or undef gets passed to the
		427	callback.
328		428
329	=item aio_rename $srcpath, $dstpath, $callback->($status)	429	=item aio_rename $srcpath, $dstpath, $callback->($status)
330		430
331	Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as	431	Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as
332	rename(2) and call the callback with the result code.	432	rename(2) and call the callback with the result code.
…		…
343	sorted, and will B<NOT> include the C<.> and C<..> entries.	443	sorted, and will B<NOT> include the C<.> and C<..> entries.
344		444
345	The callback a single argument which is either C<undef> or an array-ref	445	The callback a single argument which is either C<undef> or an array-ref
346	with the filenames.	446	with the filenames.
347		447
		448	=item aio_copy $srcpath, $dstpath, $callback->($status)
		449
		450	Try to copy the I<file> (directories not supported as either source or
		451	destination) from C<$srcpath> to C<$dstpath> and call the callback with
		452	the C<0> (error) or C<-1> ok.
		453
		454	This is a composite request that it creates the destination file with
		455	mode 0200 and copies the contents of the source file into it using
		456	C<aio_sendfile>, followed by restoring atime, mtime, access mode and
		457	uid/gid, in that order.
		458
		459	If an error occurs, the partial destination file will be unlinked, if
		460	possible, except when setting atime, mtime, access mode and uid/gid, where
		461	errors are being ignored.
		462
		463	=cut
		464
		465	sub aio_copy($$;$) {
		466	my ($src, $dst, $cb) = @_;
		467
		468	my $pri = aioreq_pri;
		469	my $grp = aio_group $cb;
		470
		471	aioreq_pri $pri;
		472	add $grp aio_open $src, O_RDONLY, 0, sub {
		473	if (my $src_fh = $_[0]) {
		474	my @stat = stat $src_fh;
		475
		476	aioreq_pri $pri;
		477	add $grp aio_open $dst, O_CREAT \| O_WRONLY \| O_TRUNC, 0200, sub {
		478	if (my $dst_fh = $_[0]) {
		479	aioreq_pri $pri;
		480	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
		481	if ($_[0] == $stat[7]) {
		482	$grp->result (0);
		483	close $src_fh;
		484
		485	# those should not normally block. should. should.
		486	utime $stat[8], $stat[9], $dst;
		487	chmod $stat[2] & 07777, $dst_fh;
		488	chown $stat[4], $stat[5], $dst_fh;
		489	close $dst_fh;
		490	} else {
		491	$grp->result (-1);
		492	close $src_fh;
		493	close $dst_fh;
		494
		495	aioreq $pri;
		496	add $grp aio_unlink $dst;
		497	}
		498	};
		499	} else {
		500	$grp->result (-1);
		501	}
		502	},
		503
		504	} else {
		505	$grp->result (-1);
		506	}
		507	};
		508
		509	$grp
		510	}
		511
		512	=item aio_move $srcpath, $dstpath, $callback->($status)
		513
		514	Try to move the I<file> (directories not supported as either source or
		515	destination) from C<$srcpath> to C<$dstpath> and call the callback with
		516	the C<0> (error) or C<-1> ok.
		517
		518	This is a composite request that tries to rename(2) the file first. If
		519	rename files with C<EXDEV>, it copies the file with C<aio_copy> and, if
		520	that is successful, unlinking the C<$srcpath>.
		521
		522	=cut
		523
		524	sub aio_move($$;$) {
		525	my ($src, $dst, $cb) = @_;
		526
		527	my $pri = aioreq_pri;
		528	my $grp = aio_group $cb;
		529
		530	aioreq_pri $pri;
		531	add $grp aio_rename $src, $dst, sub {
		532	if ($_[0] && $! == EXDEV) {
		533	aioreq_pri $pri;
		534	add $grp aio_copy $src, $dst, sub {
		535	$grp->result ($_[0]);
		536
		537	if (!$_[0]) {
		538	aioreq_pri $pri;
		539	add $grp aio_unlink $src;
		540	}
		541	};
		542	} else {
		543	$grp->result ($_[0]);
		544	}
		545	};
		546
		547	$grp
		548	}
		549
348	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)	550	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
349		551
350	[EXPERIMENTAL due to internal aio_group use]
351
352	Scans a directory (similar to C<aio_readdir>) but additionally tries to	552	Scans a directory (similar to C<aio_readdir>) but additionally tries to
353	separate the entries of directory C<$path> into two sets of names, ones	553	efficiently separate the entries of directory C<$path> into two sets of
354	you can recurse into (directories or links to them), and ones you cannot	554	names, directories you can recurse into (directories), and ones you cannot
355	recurse into (everything else).	555	recurse into (everything else, including symlinks to directories).
356		556
357	C<aio_scandir> is a composite request that creates of many sub requests_	557	C<aio_scandir> is a composite request that creates of many sub requests_
358	C<$maxreq> specifies the maximum number of outstanding aio requests that	558	C<$maxreq> specifies the maximum number of outstanding aio requests that
359	this function generates. If it is C<< <= 0 >>, then a suitable default	559	this function generates. If it is C<< <= 0 >>, then a suitable default
360	will be chosen (currently 6).	560	will be chosen (currently 4).
361		561
362	On error, the callback is called without arguments, otherwise it receives	562	On error, the callback is called without arguments, otherwise it receives
363	two array-refs with path-relative entry names.	563	two array-refs with path-relative entry names.
364		564
365	Example:	565	Example:
…		…
402	=cut	602	=cut
403		603
404	sub aio_scandir($$$) {	604	sub aio_scandir($$$) {
405	my ($path, $maxreq, $cb) = @_;	605	my ($path, $maxreq, $cb) = @_;
406		606
		607	my $pri = aioreq_pri;
		608
407	my $grp = aio_group $cb;	609	my $grp = aio_group $cb;
408		610
409	$maxreq = 6 if $maxreq <= 0;	611	$maxreq = 4 if $maxreq <= 0;
410		612
411	# stat once	613	# stat once
		614	aioreq_pri $pri;
412	add $grp aio_stat $path, sub {	615	add $grp aio_stat $path, sub {
413	return $grp->result () if $_[0];	616	return $grp->result () if $_[0];
414	my $now = time;	617	my $now = time;
415	my $hash1 = join ":", (stat _)[0,1,3,7,9];	618	my $hash1 = join ":", (stat _)[0,1,3,7,9];
416		619
417	# read the directory entries	620	# read the directory entries
		621	aioreq_pri $pri;
418	add $grp aio_readdir $path, sub {	622	add $grp aio_readdir $path, sub {
419	my $entries = shift	623	my $entries = shift
420	or return $grp->result ();	624	or return $grp->result ();
421		625
422	# stat the dir another time	626	# stat the dir another time
		627	aioreq_pri $pri;
423	add $grp aio_stat $path, sub {	628	add $grp aio_stat $path, sub {
424	my $hash2 = join ":", (stat _)[0,1,3,7,9];	629	my $hash2 = join ":", (stat _)[0,1,3,7,9];
425		630
426	my $ndirs;	631	my $ndirs;
427		632
…		…
442	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],	647	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
443	@$entries];	648	@$entries];
444		649
445	my (@dirs, @nondirs);	650	my (@dirs, @nondirs);
446		651
447	my ($statcb, $schedcb);
448	my $nreq = 0;
449
450	my $statgrp = add $grp aio_group;	652	my $statgrp = add $grp aio_group sub {
		653	$grp->result (\@dirs, \@nondirs);
		654	};
451		655
452	$schedcb = sub {	656	limit $statgrp $maxreq;
453	if (@$entries) {	657	feed $statgrp sub {
454	if ($nreq < $maxreq) {	658	return unless @$entries;
455	my $ent = pop @$entries;	659	my $entry = pop @$entries;
		660
		661	aioreq_pri $pri;
		662	add $statgrp aio_stat "$path/$entry/.", sub {
		663	if ($_[0] < 0) {
		664	push @nondirs, $entry;
		665	} else {
		666	# need to check for real directory
		667	aioreq_pri $pri;
		668	add $statgrp aio_lstat "$path/$entry", sub {
		669	if (-d _) {
		670	push @dirs, $entry;
		671
		672	unless (--$ndirs) {
		673	push @nondirs, @$entries;
		674	feed $statgrp;
		675	}
		676	} else {
		677	push @nondirs, $entry;
		678	}
456	$nreq++;	679	}
457	add $statgrp aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) };
458	}	680	}
459	} elsif (!$nreq) {
460	# finished
461	$statgrp->cancel;
462	undef $statcb;
463	undef $schedcb;
464	$grp->result (\@dirs, \@nondirs);
465	}	681	};
466	};	682	};
467	$statcb = sub {
468	my ($status, $entry) = @_;
469
470	if ($status < 0) {
471	$nreq--;
472	push @nondirs, $entry;
473	&$schedcb;
474	} else {
475	# need to check for real directory
476	add $grp aio_lstat "$path/$entry", sub {
477	$nreq--;
478
479	if (-d _) {
480	push @dirs, $entry;
481
482	if (!--$ndirs) {
483	push @nondirs, @$entries;
484	$entries = [];
485	}
486	} else {
487	push @nondirs, $entry;
488	}
489
490	&$schedcb;
491	}
492	}
493	};
494
495	&$schedcb while @$entries && $nreq < $maxreq;
496	};	683	};
497	};	684	};
498	};	685	};
499		686
500	$grp	687	$grp
…		…
513	If this call isn't available because your OS lacks it or it couldn't be	700	If this call isn't available because your OS lacks it or it couldn't be
514	detected, it will be emulated by calling C<fsync> instead.	701	detected, it will be emulated by calling C<fsync> instead.
515		702
516	=item aio_group $callback->(...)	703	=item aio_group $callback->(...)
517		704
518	[EXPERIMENTAL]
519
520	This is a very special aio request: Instead of doing something, it is a	705	This is a very special aio request: Instead of doing something, it is a
521	container for other aio requests, which is useful if you want to bundle	706	container for other aio requests, which is useful if you want to bundle
522	many requests into a single, composite, request.	707	many requests into a single, composite, request with a definite callback
		708	and the ability to cancel the whole request with its subrequests.
523		709
524	Returns an object of class L<IO::AIO::GRP>. See its documentation below	710	Returns an object of class L<IO::AIO::GRP>. See its documentation below
525	for more info.	711	for more info.
526		712
527	Example:	713	Example:
…		…
540	This is a special request - it does nothing in itself and is only used for	726	This is a special request - it does nothing in itself and is only used for
541	side effects, such as when you want to add a dummy request to a group so	727	side effects, such as when you want to add a dummy request to a group so
542	that finishing the requests in the group depends on executing the given	728	that finishing the requests in the group depends on executing the given
543	code.	729	code.
544		730
		731	While this request does nothing, it still goes through the execution
		732	phase and still requires a worker thread. Thus, the callback will not
		733	be executed immediately but only after other requests in the queue have
		734	entered their execution phase. This can be used to measure request
		735	latency.
		736
545	=item IO::AIO::aio_sleep $fractional_seconds, $callback->() NOT EXPORTED	737	=item IO::AIO::aio_busy $fractional_seconds, $callback->() NOT EXPORTED
546		738
547	Mainly used for debugging and benchmarking, this aio request puts one of	739	Mainly used for debugging and benchmarking, this aio request puts one of
548	the request workers to sleep for the given time.	740	the request workers to sleep for the given time.
549		741
550	While it is theoretically handy to have simple I/O scheduling requests	742	While it is theoretically handy to have simple I/O scheduling requests
551	like sleep and file handle readable/writable, the overhead this creates	743	like sleep and file handle readable/writable, the overhead this creates is
552	is immense, so do not use this function except to put your application	744	immense (it blocks a thread for a long time) so do not use this function
553	under artificial I/O pressure.	745	except to put your application under artificial I/O pressure.
554		746
555	=back	747	=back
556		748
557	=head2 IO::AIO::REQ CLASS	749	=head2 IO::AIO::REQ CLASS
558		750
559	All non-aggregate C<aio_*> functions return an object of this class when	751	All non-aggregate C<aio_*> functions return an object of this class when
560	called in non-void context.	752	called in non-void context.
561		753
562	A request always moves through the following five states in its lifetime,
563	in order: B<ready> (request has been created, but has not been executed
564	yet), B<execute> (request is currently being executed), B<pending>
565	(request has been executed but callback has not been called yet),
566	B<result> (results are being processed synchronously, includes calling the
567	callback) and B<done> (request has reached the end of its lifetime and
568	holds no resources anymore).
569
570	=over 4	754	=over 4
571		755
572	=item $req->cancel	756	=item cancel $req
573		757
574	Cancels the request, if possible. Has the effect of skipping execution	758	Cancels the request, if possible. Has the effect of skipping execution
575	when entering the B<execute> state and skipping calling the callback when	759	when entering the B<execute> state and skipping calling the callback when
576	entering the the B<result> state, but will leave the request otherwise	760	entering the the B<result> state, but will leave the request otherwise
577	untouched. That means that requests that currently execute will not be	761	untouched. That means that requests that currently execute will not be
578	stopped and resources held by the request will not be freed prematurely.	762	stopped and resources held by the request will not be freed prematurely.
579		763
		764	=item cb $req $callback->(...)
		765
		766	Replace (or simply set) the callback registered to the request.
		767
580	=back	768	=back
581		769
582	=head2 IO::AIO::GRP CLASS	770	=head2 IO::AIO::GRP CLASS
583		771
584	This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to	772	This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to
…		…
623	=item * They can also can also be added to other IO::AIO::GRP objects.	811	=item * They can also can also be added to other IO::AIO::GRP objects.
624		812
625	=item * You must not add requests to a group from within the group callback (or	813	=item * You must not add requests to a group from within the group callback (or
626	any later time).	814	any later time).
627		815
628	=item * This does not harmonise well with C<max_outstanding>, so best do
629	not combine C<aio_group> with it. Groups and feeders are recommended for
630	this kind of concurrency-limiting.
631
632	=back	816	=back
633		817
634	Their lifetime, simplified, looks like this: when they are empty, they	818	Their lifetime, simplified, looks like this: when they are empty, they
635	will finish very quickly. If they contain only requests that are in the	819	will finish very quickly. If they contain only requests that are in the
636	C<done> state, they will also finish. Otherwise they will continue to	820	C<done> state, they will also finish. Otherwise they will continue to
…		…
641	group. And only when all those requests have finished will the the group	825	group. And only when all those requests have finished will the the group
642	itself finish.	826	itself finish.
643		827
644	=over 4	828	=over 4
645		829
		830	=item add $grp ...
		831
646	=item $grp->add (...)	832	=item $grp->add (...)
647
648	=item add $grp ...
649		833
650	Add one or more requests to the group. Any type of L<IO::AIO::REQ> can	834	Add one or more requests to the group. Any type of L<IO::AIO::REQ> can
651	be added, including other groups, as long as you do not create circular	835	be added, including other groups, as long as you do not create circular
652	dependencies.	836	dependencies.
653		837
654	Returns all its arguments.	838	Returns all its arguments.
655		839
		840	=item $grp->cancel_subs
		841
		842	Cancel all subrequests and clears any feeder, but not the group request
		843	itself. Useful when you queued a lot of events but got a result early.
		844
656	=item $grp->result (...)	845	=item $grp->result (...)
657		846
658	Set the result value(s) that will be passed to the group callback when all	847	Set the result value(s) that will be passed to the group callback when all
659	subrequests have finished. By default, no argument will be passed.	848	subrequests have finished and set thre groups errno to the current value
		849	of errno (just like calling C<errno> without an error number). By default,
		850	no argument will be passed and errno is zero.
660		851
661	=item $grp->set_feeder ($callback->($grp))	852	=item $grp->errno ([$errno])
662		853
663	[VERY EXPERIMENTAL]	854	Sets the group errno value to C<$errno>, or the current value of errno
		855	when the argument is missing.
		856
		857	Every aio request has an associated errno value that is restored when
		858	the callback is invoked. This method lets you change this value from its
		859	default (0).
		860
		861	Calling C<result> will also set errno, so make sure you either set C<$!>
		862	before the call to C<result>, or call c<errno> after it.
		863
		864	=item feed $grp $callback->($grp)
664		865
665	Sets a feeder/generator on this group: every group can have an attached	866	Sets a feeder/generator on this group: every group can have an attached
666	generator that generates requests if idle. The idea behind this is that,	867	generator that generates requests if idle. The idea behind this is that,
667	although you could just queue as many requests as you want in a group,	868	although you could just queue as many requests as you want in a group,
668	this might starve other requests for a potentially long time. For	869	this might starve other requests for a potentially long time. For
669	example, C<aio_scandir> might generate hundreds of thousands C<aio_stat>	870	example, C<aio_scandir> might generate hundreds of thousands C<aio_stat>
670	requests, delaying any later requests for a long time.	871	requests, delaying any later requests for a long time.
671		872
672	To avoid this, and allow incremental generation of requests, you can	873	To avoid this, and allow incremental generation of requests, you can
673	instead a group and set a feeder on it that generates those requests. The	874	instead a group and set a feeder on it that generates those requests. The
674	feeder will be called whenever there are few enough (see C<feeder_limit>,	875	feed callback will be called whenever there are few enough (see C<limit>,
675	below) requests active in the group itself and is expected to queue more	876	below) requests active in the group itself and is expected to queue more
676	requests.	877	requests.
677		878
678	The feeder can queue as many requests as it likes (i.e. C<add> does not	879	The feed callback can queue as many requests as it likes (i.e. C<add> does
679	impose any limits).	880	not impose any limits).
680		881
681	If the feeder does not queue more requests when called, it will be	882	If the feed does not queue more requests when called, it will be
682	automatically removed from the group.	883	automatically removed from the group.
683		884
684	If the feeder limit is C<0>, it will be set to C<2> automatically.	885	If the feed limit is C<0>, it will be set to C<2> automatically.
685		886
686	Example:	887	Example:
687		888
688	# stat all files in @files, but only ever use four aio requests concurrently:	889	# stat all files in @files, but only ever use four aio requests concurrently:
689		890
690	my $grp = aio_group sub { print "finished\n" };	891	my $grp = aio_group sub { print "finished\n" };
691	$grp->feeder_limit (4);	892	limit $grp 4;
692	$grp->set_feeder (sub {	893	feed $grp sub {
693	my $file = pop @files	894	my $file = pop @files
694	or return;	895	or return;
695		896
696	add $grp aio_stat $file, sub { ... };	897	add $grp aio_stat $file, sub { ... };
697	});	898	};
698		899
699	=item $grp->feeder_limit ($num)	900	=item limit $grp $num
700		901
701	Sets the feeder limit for the group: The feeder will be called whenever	902	Sets the feeder limit for the group: The feeder will be called whenever
702	the group contains less than this many requests.	903	the group contains less than this many requests.
703		904
704	Setting the limit to C<0> will pause the feeding process.	905	Setting the limit to C<0> will pause the feeding process.
705		906
706	=back	907	=back
707		908
708	=head2 SUPPORT FUNCTIONS	909	=head2 SUPPORT FUNCTIONS
		910
		911	=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION
709		912
710	=over 4	913	=over 4
711		914
712	=item $fileno = IO::AIO::poll_fileno	915	=item $fileno = IO::AIO::poll_fileno
713		916
…		…
718		921
719	See C<poll_cb> for an example.	922	See C<poll_cb> for an example.
720		923
721	=item IO::AIO::poll_cb	924	=item IO::AIO::poll_cb
722		925
723	Process all outstanding events on the result pipe. You have to call this	926	Process some outstanding events on the result pipe. You have to call this
724	regularly. Returns the number of events processed. Returns immediately	927	regularly. Returns the number of events processed. Returns immediately
725	when no events are outstanding.	928	when no events are outstanding. The amount of events processed depends on
		929	the settings of C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>.
		930
		931	If not all requests were processed for whatever reason, the filehandle
		932	will still be ready when C<poll_cb> returns.
726		933
727	Example: Install an Event watcher that automatically calls	934	Example: Install an Event watcher that automatically calls
728	IO::AIO::poll_cb with high priority:	935	IO::AIO::poll_cb with high priority:
729		936
730	Event->io (fd => IO::AIO::poll_fileno,	937	Event->io (fd => IO::AIO::poll_fileno,
731	poll => 'r', async => 1,	938	poll => 'r', async => 1,
732	cb => \&IO::AIO::poll_cb);	939	cb => \&IO::AIO::poll_cb);
733		940
		941	=item IO::AIO::max_poll_reqs $nreqs
		942
		943	=item IO::AIO::max_poll_time $seconds
		944
		945	These set the maximum number of requests (default C<0>, meaning infinity)
		946	that are being processed by C<IO::AIO::poll_cb> in one call, respectively
		947	the maximum amount of time (default C<0>, meaning infinity) spent in
		948	C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount
		949	of time C<poll_cb> is allowed to use).
		950
		951	Setting C<max_poll_time> to a non-zero value creates an overhead of one
		952	syscall per request processed, which is not normally a problem unless your
		953	callbacks are really really fast or your OS is really really slow (I am
		954	not mentioning Solaris here). Using C<max_poll_reqs> incurs no overhead.
		955
		956	Setting these is useful if you want to ensure some level of
		957	interactiveness when perl is not fast enough to process all requests in
		958	time.
		959
		960	For interactive programs, values such as C<0.01> to C<0.1> should be fine.
		961
		962	Example: Install an Event watcher that automatically calls
		963	IO::AIO::poll_cb with low priority, to ensure that other parts of the
		964	program get the CPU sometimes even under high AIO load.
		965
		966	# try not to spend much more than 0.1s in poll_cb
		967	IO::AIO::max_poll_time 0.1;
		968
		969	# use a low priority so other tasks have priority
		970	Event->io (fd => IO::AIO::poll_fileno,
		971	poll => 'r', nice => 1,
		972	cb => &IO::AIO::poll_cb);
		973
734	=item IO::AIO::poll_wait	974	=item IO::AIO::poll_wait
735		975
736	Wait till the result filehandle becomes ready for reading (simply does a	976	If there are any outstanding requests, wait till the result filehandle
737	C<select> on the filehandle. This is useful if you want to synchronously wait	977	becomes ready for reading (simply does a C<select> on the filehandle. This
738	for some requests to finish).	978	is useful if you want to synchronously wait for some requests to finish).
739		979
740	See C<nreqs> for an example.	980	See C<nreqs> for an example.
741		981
		982	=item IO::AIO::poll
		983
		984	Waits until some requests have been handled.
		985
		986	Returns the number of requests processed, but is otherwise strictly
		987	equivalent to:
		988
		989	IO::AIO::poll_wait, IO::AIO::poll_cb
		990	if IO::AIO::nreqs;
		991
742	=item IO::AIO::nreqs	992	=item IO::AIO::flush
743		993
744	Returns the number of requests currently outstanding (i.e. for which their	994	Wait till all outstanding AIO requests have been handled.
745	callback has not been invoked yet).
746		995
747	Example: wait till there are no outstanding requests anymore:	996	Strictly equivalent to:
748		997
749	IO::AIO::poll_wait, IO::AIO::poll_cb	998	IO::AIO::poll_wait, IO::AIO::poll_cb
750	while IO::AIO::nreqs;	999	while IO::AIO::nreqs;
751		1000
752	=item IO::AIO::flush	1001	=head3 CONTROLLING THE NUMBER OF THREADS
753
754	Wait till all outstanding AIO requests have been handled.
755
756	Strictly equivalent to:
757
758	IO::AIO::poll_wait, IO::AIO::poll_cb
759	while IO::AIO::nreqs;
760
761	=item IO::AIO::poll
762
763	Waits until some requests have been handled.
764
765	Strictly equivalent to:
766
767	IO::AIO::poll_wait, IO::AIO::poll_cb
768	if IO::AIO::nreqs;
769		1002
770	=item IO::AIO::min_parallel $nthreads	1003	=item IO::AIO::min_parallel $nthreads
771		1004
772	Set the minimum number of AIO threads to C<$nthreads>. The current	1005	Set the minimum number of AIO threads to C<$nthreads>. The current
773	default is C<8>, which means eight asynchronous operations can execute	1006	default is C<8>, which means eight asynchronous operations can execute
774	concurrently at any one time (the number of outstanding requests,	1007	concurrently at any one time (the number of outstanding requests,
775	however, is unlimited).	1008	however, is unlimited).
776		1009
777	IO::AIO starts threads only on demand, when an AIO request is queued and	1010	IO::AIO starts threads only on demand, when an AIO request is queued and
778	no free thread exists.	1011	no free thread exists. Please note that queueing up a hundred requests can
		1012	create demand for a hundred threads, even if it turns out that everything
		1013	is in the cache and could have been processed faster by a single thread.
779		1014
780	It is recommended to keep the number of threads relatively low, as some	1015	It is recommended to keep the number of threads relatively low, as some
781	Linux kernel versions will scale negatively with the number of threads	1016	Linux kernel versions will scale negatively with the number of threads
782	(higher parallelity => MUCH higher latency). With current Linux 2.6	1017	(higher parallelity => MUCH higher latency). With current Linux 2.6
783	versions, 4-32 threads should be fine.	1018	versions, 4-32 threads should be fine.
…		…
797	This module automatically runs C<max_parallel 0> at program end, to ensure	1032	This module automatically runs C<max_parallel 0> at program end, to ensure
798	that all threads are killed and that there are no outstanding requests.	1033	that all threads are killed and that there are no outstanding requests.
799		1034
800	Under normal circumstances you don't need to call this function.	1035	Under normal circumstances you don't need to call this function.
801		1036
		1037	=item IO::AIO::max_idle $nthreads
		1038
		1039	Limit the number of threads (default: 4) that are allowed to idle (i.e.,
		1040	threads that did not get a request to process within 10 seconds). That
		1041	means if a thread becomes idle while C<$nthreads> other threads are also
		1042	idle, it will free its resources and exit.
		1043
		1044	This is useful when you allow a large number of threads (e.g. 100 or 1000)
		1045	to allow for extremely high load situations, but want to free resources
		1046	under normal circumstances (1000 threads can easily consume 30MB of RAM).
		1047
		1048	The default is probably ok in most situations, especially if thread
		1049	creation is fast. If thread creation is very slow on your system you might
		1050	want to use larger values.
		1051
802	=item $oldnreqs = IO::AIO::max_outstanding $nreqs	1052	=item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs
803		1053
804	[DEPRECATED]	1054	This is a very bad function to use in interactive programs because it
		1055	blocks, and a bad way to reduce concurrency because it is inexact: Better
		1056	use an C<aio_group> together with a feed callback.
805		1057
806	Sets the maximum number of outstanding requests to C<$nreqs>. If you	1058	Sets the maximum number of outstanding requests to C<$nreqs>. If you
807	try to queue up more than this number of requests, the caller will block until	1059	to queue up more than this number of requests, the next call to the
808	some requests have been handled.	1060	C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>)
		1061	function will block until the limit is no longer exceeded.
809		1062
810	The default is very large, so normally there is no practical limit. If you	1063	The default value is very large, so there is no practical limit on the
811	queue up many requests in a loop it often improves speed if you set	1064	number of outstanding requests.
812	this to a relatively low number, such as C<100>.
813		1065
814	This function does not work well together with C<aio_group>'s, and their	1066	You can still queue as many requests as you want. Therefore,
815	feeder interface is better suited to limiting concurrency, so do not use	1067	C<max_oustsanding> is mainly useful in simple scripts (with low values) or
816	this function.	1068	as a stop gap to shield against fatal memory overflow (with large values).
817		1069
818	Under normal circumstances you don't need to call this function.	1070	=head3 STATISTICAL INFORMATION
		1071
		1072	=item IO::AIO::nreqs
		1073
		1074	Returns the number of requests currently in the ready, execute or pending
		1075	states (i.e. for which their callback has not been invoked yet).
		1076
		1077	Example: wait till there are no outstanding requests anymore:
		1078
		1079	IO::AIO::poll_wait, IO::AIO::poll_cb
		1080	while IO::AIO::nreqs;
		1081
		1082	=item IO::AIO::nready
		1083
		1084	Returns the number of requests currently in the ready state (not yet
		1085	executed).
		1086
		1087	=item IO::AIO::npending
		1088
		1089	Returns the number of requests currently in the pending state (executed,
		1090	but not yet processed by poll_cb).
819		1091
820	=back	1092	=back
821		1093
822	=cut	1094	=cut
823		1095
…		…
838	}	1110	}
839		1111
840	min_parallel 8;	1112	min_parallel 8;
841		1113
842	END {	1114	END {
843	max_parallel 0;	1115	min_parallel 1;
844	}	1116	flush;
		1117	};
845		1118
846	1;	1119	1;
847		1120
848	=head2 FORK BEHAVIOUR	1121	=head2 FORK BEHAVIOUR
849		1122
850	This module should do "the right thing" when the process using it forks:	1123	This module should do "the right thing" when the process using it forks:
851		1124
852	Before the fork, IO::AIO enters a quiescent state where no requests	1125	Before the fork, IO::AIO enters a quiescent state where no requests
853	can be added in other threads and no results will be processed. After	1126	can be added in other threads and no results will be processed. After
854	the fork the parent simply leaves the quiescent state and continues	1127	the fork the parent simply leaves the quiescent state and continues
855	request/result processing, while the child clears the request/result	1128	request/result processing, while the child frees the request/result queue
856	queue (so the requests started before the fork will only be handled in	1129	(so that the requests started before the fork will only be handled in the
857	the parent). Threads will be started on demand until the limit ste in the	1130	parent). Threads will be started on demand until the limit set in the
858	parent process has been reached again.	1131	parent process has been reached again.
859		1132
860	In short: the parent will, after a short pause, continue as if fork had	1133	In short: the parent will, after a short pause, continue as if fork had
861	not been called, while the child will act as if IO::AIO has not been used	1134	not been called, while the child will act as if IO::AIO has not been used
862	yet.	1135	yet.
863		1136
864	=head2 MEMORY USAGE	1137	=head2 MEMORY USAGE
865		1138
		1139	Per-request usage:
		1140
866	Each aio request uses - depending on your architecture - around 128 bytes	1141	Each aio request uses - depending on your architecture - around 100-200
867	of memory. In addition, stat requests need a stat buffer (possibly a few	1142	bytes of memory. In addition, stat requests need a stat buffer (possibly
868	hundred bytes). Perl scalars and other data passed into aio requests will	1143	a few hundred bytes), readdir requires a result buffer and so on. Perl
869	also be locked.	1144	scalars and other data passed into aio requests will also be locked and
		1145	will consume memory till the request has entered the done state.
870		1146
871	This is now awfully much, so queuing lots of requests is not usually a	1147	This is now awfully much, so queuing lots of requests is not usually a
872	problem.	1148	problem.
873		1149
874	Each thread needs a stack area which is usually around 16k, sometimes much	1150	Per-thread usage:
875	larger, depending on the OS.	1151
		1152	In the execution phase, some aio requests require more memory for
		1153	temporary buffers, and each thread requires a stack and other data
		1154	structures (usually around 16k-128k, depending on the OS).
		1155
		1156	=head1 KNOWN BUGS
		1157
		1158	Known bugs will be fixed in the next release.
876		1159
877	=head1 SEE ALSO	1160	=head1 SEE ALSO
878		1161
879	L<Coro>, L<Linux::AIO> (obsolete).	1162	L<Coro::AIO>.
880		1163
881	=head1 AUTHOR	1164	=head1 AUTHOR
882		1165
883	Marc Lehmann <schmorp@schmorp.de>	1166	Marc Lehmann <schmorp@schmorp.de>
884	http://home.schmorp.de/	1167	http://home.schmorp.de/

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.63 by root, Mon Oct 23 00:34:36 2006 UTC vs. Revision 1.92 by root, Wed Nov 8 01:57:42 2006 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.63 by root, Mon Oct 23 00:34:36 2006 UTC vs.
Revision 1.92 by root, Wed Nov 8 01:57:42 2006 UTC