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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.56 by root, Sun Oct 22 00:53:47 2006 UTC vs.
Revision 1.90 by root, Mon Oct 30 23:30:00 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 = '2.1';
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);	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	Try to move the I<file> (directories not supported as either source or
188	destination) from C<$srcpath> to C<$dstpath> and call the callback with
189	the C<0> (error) or C<-1> ok.
190
191	This is a composite request that tries to rename(2) the file first. If
192	rename files with C<EXDEV>, it creates the destination file with mode 0200
193	and copies the contents of the source file into it using C<aio_sendfile>,
194	followed by restoring atime, mtime, access mode and uid/gid, in that
195	order, and unlinking the C<$srcpath>.
196
197	If an error occurs, the partial destination file will be unlinked, if
198	possible, except when setting atime, mtime, access mode and uid/gid, where
199	errors are being ignored.
200
201	=cut
202
203	sub aio_move($$$) {
204	my ($src, $dst, $cb) = @_;
205
206	my $grp = aio_group;
207
208	add $grp aio_rename $src, $dst, sub {
209	if ($_[0] && $! == EXDEV) {
210	add $grp aio_open $src, O_RDONLY, 0, sub {
211	if (my $src_fh = $_[0]) {
212	my @stat = stat $src_fh;
213
214	add $grp aio_open $dst, O_WRONLY, 0200, sub {
215	if (my $dst_fh = $_[0]) {
216	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
217	close $src_fh;
218
219	if ($_[0] == $stat[7]) {
220	utime $stat[8], $stat[9], $dst;
221	chmod $stat[2] & 07777, $dst_fh;
222	chown $stat[4], $stat[5], $dst_fh;
223	close $dst_fh;
224
225	add $grp aio_unlink $src, sub {
226	$cb->($_[0]);
227	};
228	} else {
229	my $errno = $!;
230	add $grp aio_unlink $dst, sub {
231	$! = $errno;
232	$cb->(-1);
233	};
234	}
235	};
236	} else {
237	$cb->(-1);
238	}
239	},
240
241	} else {
242	$cb->(-1);
243	}
244	};
245	} else {
246	$cb->($_[0]);
247	}
248	};
249
250	$grp
251	}
252		338
253	=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)
254		340
255	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
256	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
…		…
312	=item aio_unlink $pathname, $callback->($status)	398	=item aio_unlink $pathname, $callback->($status)
313		399
314	Asynchronously unlink (delete) a file and call the callback with the	400	Asynchronously unlink (delete) a file and call the callback with the
315	result code.	401	result code.
316		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
317	=item aio_link $srcpath, $dstpath, $callback->($status)	413	=item aio_link $srcpath, $dstpath, $callback->($status)
318		414
319	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
320	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.
321		417
322	=item aio_symlink $srcpath, $dstpath, $callback->($status)	418	=item aio_symlink $srcpath, $dstpath, $callback->($status)
323		419
324	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
325	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.
326		428
327	=item aio_rename $srcpath, $dstpath, $callback->($status)	429	=item aio_rename $srcpath, $dstpath, $callback->($status)
328		430
329	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
330	rename(2) and call the callback with the result code.	432	rename(2) and call the callback with the result code.
…		…
341	sorted, and will B<NOT> include the C<.> and C<..> entries.	443	sorted, and will B<NOT> include the C<.> and C<..> entries.
342		444
343	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
344	with the filenames.	446	with the filenames.
345		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
346	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)	550	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
347		551
348	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
349	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
350	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
351	recurse into (everything else).	555	recurse into (everything else, including symlinks to directories).
352		556
353	C<aio_scandir> is a composite request that consists of many sub	557	C<aio_scandir> is a composite request that creates of many sub requests_
354	requests. C<$maxreq> specifies the maximum number of outstanding aio	558	C<$maxreq> specifies the maximum number of outstanding aio requests that
355	requests that this function generates. If it is C<< <= 0 >>, then a	559	this function generates. If it is C<< <= 0 >>, then a suitable default
356	suitable default will be chosen (currently 8).	560	will be chosen (currently 4).
357		561
358	On error, the callback is called without arguments, otherwise it receives	562	On error, the callback is called without arguments, otherwise it receives
359	two array-refs with path-relative entry names.	563	two array-refs with path-relative entry names.
360		564
361	Example:	565	Example:
…		…
398	=cut	602	=cut
399		603
400	sub aio_scandir($$$) {	604	sub aio_scandir($$$) {
401	my ($path, $maxreq, $cb) = @_;	605	my ($path, $maxreq, $cb) = @_;
402		606
		607	my $pri = aioreq_pri;
		608
403	my $grp = aio_group;	609	my $grp = aio_group $cb;
404		610
405	$maxreq = 8 if $maxreq <= 0;	611	$maxreq = 4 if $maxreq <= 0;
406		612
407	# stat once	613	# stat once
		614	aioreq_pri $pri;
408	add $grp aio_stat $path, sub {	615	add $grp aio_stat $path, sub {
409	return $cb->() if $_[0];	616	return $grp->result () if $_[0];
410	my $now = time;	617	my $now = time;
411	my $hash1 = join ":", (stat _)[0,1,3,7,9];	618	my $hash1 = join ":", (stat _)[0,1,3,7,9];
412		619
413	# read the directory entries	620	# read the directory entries
		621	aioreq_pri $pri;
414	add $grp aio_readdir $path, sub {	622	add $grp aio_readdir $path, sub {
415	my $entries = shift	623	my $entries = shift
416	or return $cb->();	624	or return $grp->result ();
417		625
418	# stat the dir another time	626	# stat the dir another time
		627	aioreq_pri $pri;
419	add $grp aio_stat $path, sub {	628	add $grp aio_stat $path, sub {
420	my $hash2 = join ":", (stat _)[0,1,3,7,9];	629	my $hash2 = join ":", (stat _)[0,1,3,7,9];
421		630
422	my $ndirs;	631	my $ndirs;
423		632
…		…
426	$ndirs = -1;	635	$ndirs = -1;
427	} else {	636	} else {
428	# if nlink == 2, we are finished	637	# if nlink == 2, we are finished
429	# on non-posix-fs's, we rely on nlink < 2	638	# on non-posix-fs's, we rely on nlink < 2
430	$ndirs = (stat _)[3] - 2	639	$ndirs = (stat _)[3] - 2
431	or return $cb->([], $entries);	640	or return $grp->result ([], $entries);
432	}	641	}
433		642
434	# sort into likely dirs and likely nondirs	643	# sort into likely dirs and likely nondirs
435	# dirs == files without ".", short entries first	644	# dirs == files without ".", short entries first
436	$entries = [map $_->[0],	645	$entries = [map $_->[0],
…		…
438	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],	647	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
439	@$entries];	648	@$entries];
440		649
441	my (@dirs, @nondirs);	650	my (@dirs, @nondirs);
442		651
443	my ($statcb, $schedcb);	652	my $statgrp = add $grp aio_group sub {
444	my $nreq = 0;	653	$grp->result (\@dirs, \@nondirs);
		654	};
445		655
446	$schedcb = sub {	656	limit $statgrp $maxreq;
447	if (@$entries) {	657	feed $statgrp sub {
448	if ($nreq < $maxreq) {	658	return unless @$entries;
449	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	}
450	$nreq++;	679	}
451	add $grp aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) };
452	}	680	}
453	} elsif (!$nreq) {
454	# finished
455	undef $statcb;
456	undef $schedcb;
457	$cb->(\@dirs, \@nondirs) if $cb;
458	undef $cb;
459	}	681	};
460	};	682	};
461	$statcb = sub {
462	my ($status, $entry) = @_;
463
464	if ($status < 0) {
465	$nreq--;
466	push @nondirs, $entry;
467	&$schedcb;
468	} else {
469	# need to check for real directory
470	add $grp aio_lstat "$path/$entry", sub {
471	$nreq--;
472
473	if (-d _) {
474	push @dirs, $entry;
475
476	if (!--$ndirs) {
477	push @nondirs, @$entries;
478	$entries = [];
479	}
480	} else {
481	push @nondirs, $entry;
482	}
483
484	&$schedcb;
485	}
486	}
487	};
488
489	&$schedcb while @$entries && $nreq < $maxreq;
490	};	683	};
491	};	684	};
492	};	685	};
493		686
494	$grp	687	$grp
…		…
505	callback with the fdatasync result code.	698	callback with the fdatasync result code.
506		699
507	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
508	detected, it will be emulated by calling C<fsync> instead.	701	detected, it will be emulated by calling C<fsync> instead.
509		702
510	=item aio_group $callback->()	703	=item aio_group $callback->(...)
511
512	[EXPERIMENTAL]
513		704
514	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
515	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
516	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.
517		709
518	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
519	for more info.	711	for more info.
520		712
521	Example:	713	Example:
…		…
527	add $grp	719	add $grp
528	(aio_stat ...),	720	(aio_stat ...),
529	(aio_stat ...),	721	(aio_stat ...),
530	...;	722	...;
531		723
		724	=item aio_nop $callback->()
		725
		726	This is a special request - it does nothing in itself and is only used for
		727	side effects, such as when you want to add a dummy request to a group so
		728	that finishing the requests in the group depends on executing the given
		729	code.
		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
532	=item IO::AIO::aio_sleep $fractional_seconds, $callback->() NOT EXPORTED	737	=item IO::AIO::aio_busy $fractional_seconds, $callback->() NOT EXPORTED
533		738
534	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
535	the request workers to sleep for the given time.	740	the request workers to sleep for the given time.
536		741
537	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
538	like sleep and file handle readable/writable, the overhead this creates	743	like sleep and file handle readable/writable, the overhead this creates is
539	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
540	under artificial I/O pressure.	745	except to put your application under artificial I/O pressure.
541		746
542	=back	747	=back
543		748
544	=head2 IO::AIO::REQ CLASS	749	=head2 IO::AIO::REQ CLASS
545		750
546	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
547	called in non-void context.	752	called in non-void context.
548		753
549	A request always moves through the following five states in its lifetime,
550	in order: B<ready> (request has been created, but has not been executed
551	yet), B<execute> (request is currently being executed), B<pending>
552	(request has been executed but callback has not been called yet),
553	B<result> (results are being processed synchronously, includes calling the
554	callback) and B<done> (request has reached the end of its lifetime and
555	holds no resources anymore).
556
557	=over 4	754	=over 4
558		755
559	=item $req->cancel	756	=item cancel $req
560		757
561	Cancels the request, if possible. Has the effect of skipping execution	758	Cancels the request, if possible. Has the effect of skipping execution
562	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
563	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
564	untouched. That means that requests that currently execute will not be	761	untouched. That means that requests that currently execute will not be
565	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.
566		763
		764	=item cb $req $callback->(...)
		765
		766	Replace (or simply set) the callback registered to the request.
		767
567	=back	768	=back
568		769
569	=head2 IO::AIO::GRP CLASS	770	=head2 IO::AIO::GRP CLASS
570		771
571	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
…		…
585	You add requests by calling the C<add> method with one or more	786	You add requests by calling the C<add> method with one or more
586	C<IO::AIO::REQ> objects:	787	C<IO::AIO::REQ> objects:
587		788
588	$grp->add (aio_unlink "...");	789	$grp->add (aio_unlink "...");
589		790
590	add $grp aio_stat "...", sub { ... };	791	add $grp aio_stat "...", sub {
		792	$_[0] or return $grp->result ("error");
		793
		794	# add another request dynamically, if first succeeded
		795	add $grp aio_open "...", sub {
		796	$grp->result ("ok");
		797	};
		798	};
591		799
592	This makes it very easy to create composite requests (see the source of	800	This makes it very easy to create composite requests (see the source of
593	C<aio_move> for an application) that work and feel like simple requests.	801	C<aio_move> for an application) that work and feel like simple requests.
594		802
		803	=over 4
		804
595	The IO::AIO::GRP objects will be cleaned up during calls to	805	=item * The IO::AIO::GRP objects will be cleaned up during calls to
596	C<IO::AIO::poll_cb>, just like any other request.	806	C<IO::AIO::poll_cb>, just like any other request.
597		807
598	They can be canceled like any other request. Canceling will cancel not	808	=item * They can be canceled like any other request. Canceling will cancel not
599	just the request itself, but also all requests it contains.	809	only the request itself, but also all requests it contains.
600		810
601	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.
		812
		813	=item * You must not add requests to a group from within the group callback (or
		814	any later time).
		815
		816	=back
602		817
603	Their lifetime, simplified, looks like this: when they are empty, they	818	Their lifetime, simplified, looks like this: when they are empty, they
604	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
605	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
606	exist.	821	exist.
607		822
		823	That means after creating a group you have some time to add requests. And
		824	in the callbacks of those requests, you can add further requests to the
		825	group. And only when all those requests have finished will the the group
		826	itself finish.
		827
608	=over 4	828	=over 4
609		829
		830	=item add $grp ...
		831
610	=item $grp->add (...)	832	=item $grp->add (...)
611		833
612	=item add $grp ...	834	Add one or more requests to the group. Any type of L<IO::AIO::REQ> can
		835	be added, including other groups, as long as you do not create circular
		836	dependencies.
613		837
614	Add one or more	838	Returns all its arguments.
615	Cancels the request, if possible. Has the effect of skipping execution	839
616	when entering the B<execute> state and skipping calling the callback when	840	=item $grp->cancel_subs
617	entering the the B<result> state, but will leave the request otherwise	841
618	untouched. That means that requests that currently execute will not be	842	Cancel all subrequests and clears any feeder, but not the group request
619	stopped and resources held by the request will not be freed prematurely.	843	itself. Useful when you queued a lot of events but got a result early.
		844
		845	=item $grp->result (...)
		846
		847	Set the result value(s) that will be passed to the group callback when all
		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.
		851
		852	=item $grp->errno ([$errno])
		853
		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)
		865
		866	Sets a feeder/generator on this group: every group can have an attached
		867	generator that generates requests if idle. The idea behind this is that,
		868	although you could just queue as many requests as you want in a group,
		869	this might starve other requests for a potentially long time. For
		870	example, C<aio_scandir> might generate hundreds of thousands C<aio_stat>
		871	requests, delaying any later requests for a long time.
		872
		873	To avoid this, and allow incremental generation of requests, you can
		874	instead a group and set a feeder on it that generates those requests. The
		875	feed callback will be called whenever there are few enough (see C<limit>,
		876	below) requests active in the group itself and is expected to queue more
		877	requests.
		878
		879	The feed callback can queue as many requests as it likes (i.e. C<add> does
		880	not impose any limits).
		881
		882	If the feed does not queue more requests when called, it will be
		883	automatically removed from the group.
		884
		885	If the feed limit is C<0>, it will be set to C<2> automatically.
		886
		887	Example:
		888
		889	# stat all files in @files, but only ever use four aio requests concurrently:
		890
		891	my $grp = aio_group sub { print "finished\n" };
		892	limit $grp 4;
		893	feed $grp sub {
		894	my $file = pop @files
		895	or return;
		896
		897	add $grp aio_stat $file, sub { ... };
		898	};
		899
		900	=item limit $grp $num
		901
		902	Sets the feeder limit for the group: The feeder will be called whenever
		903	the group contains less than this many requests.
		904
		905	Setting the limit to C<0> will pause the feeding process.
620		906
621	=back	907	=back
622		908
623	=head2 SUPPORT FUNCTIONS	909	=head2 SUPPORT FUNCTIONS
		910
		911	=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION
624		912
625	=over 4	913	=over 4
626		914
627	=item $fileno = IO::AIO::poll_fileno	915	=item $fileno = IO::AIO::poll_fileno
628		916
…		…
633		921
634	See C<poll_cb> for an example.	922	See C<poll_cb> for an example.
635		923
636	=item IO::AIO::poll_cb	924	=item IO::AIO::poll_cb
637		925
638	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
639	regularly. Returns the number of events processed. Returns immediately	927	regularly. Returns the number of events processed. Returns immediately
640	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.
641		933
642	Example: Install an Event watcher that automatically calls	934	Example: Install an Event watcher that automatically calls
643	IO::AIO::poll_cb with high priority:	935	IO::AIO::poll_cb with high priority:
644		936
645	Event->io (fd => IO::AIO::poll_fileno,	937	Event->io (fd => IO::AIO::poll_fileno,
646	poll => 'r', async => 1,	938	poll => 'r', async => 1,
647	cb => \&IO::AIO::poll_cb);	939	cb => \&IO::AIO::poll_cb);
648		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
649	=item IO::AIO::poll_wait	974	=item IO::AIO::poll_wait
650		975
651	Wait till the result filehandle becomes ready for reading (simply does a	976	Wait till the result filehandle becomes ready for reading (simply does a
652	C<select> on the filehandle. This is useful if you want to synchronously wait	977	C<select> on the filehandle. This is useful if you want to synchronously
653	for some requests to finish).	978	wait for some requests to finish).
654		979
655	See C<nreqs> for an example.	980	See C<nreqs> for an example.
656		981
		982	=item IO::AIO::poll
		983
		984	Waits until some requests have been handled.
		985
		986	Strictly equivalent to:
		987
		988	IO::AIO::poll_wait, IO::AIO::poll_cb
		989	if IO::AIO::nreqs;
		990
657	=item IO::AIO::nreqs	991	=item IO::AIO::flush
658		992
659	Returns the number of requests currently outstanding (i.e. for which their	993	Wait till all outstanding AIO requests have been handled.
660	callback has not been invoked yet).
661		994
662	Example: wait till there are no outstanding requests anymore:	995	Strictly equivalent to:
663		996
664	IO::AIO::poll_wait, IO::AIO::poll_cb	997	IO::AIO::poll_wait, IO::AIO::poll_cb
665	while IO::AIO::nreqs;	998	while IO::AIO::nreqs;
666		999
667	=item IO::AIO::flush	1000	=head3 CONTROLLING THE NUMBER OF THREADS
668
669	Wait till all outstanding AIO requests have been handled.
670
671	Strictly equivalent to:
672
673	IO::AIO::poll_wait, IO::AIO::poll_cb
674	while IO::AIO::nreqs;
675
676	=item IO::AIO::poll
677
678	Waits until some requests have been handled.
679
680	Strictly equivalent to:
681
682	IO::AIO::poll_wait, IO::AIO::poll_cb
683	if IO::AIO::nreqs;
684		1001
685	=item IO::AIO::min_parallel $nthreads	1002	=item IO::AIO::min_parallel $nthreads
686		1003
687	Set the minimum number of AIO threads to C<$nthreads>. The current default	1004	Set the minimum number of AIO threads to C<$nthreads>. The current
688	is C<4>, which means four asynchronous operations can be done at one time	1005	default is C<8>, which means eight asynchronous operations can execute
689	(the number of outstanding operations, however, is unlimited).	1006	concurrently at any one time (the number of outstanding requests,
		1007	however, is unlimited).
690		1008
691	IO::AIO starts threads only on demand, when an AIO request is queued and	1009	IO::AIO starts threads only on demand, when an AIO request is queued and
692	no free thread exists.	1010	no free thread exists. Please note that queueing up a hundred requests can
		1011	create demand for a hundred threads, even if it turns out that everything
		1012	is in the cache and could have been processed faster by a single thread.
693		1013
694	It is recommended to keep the number of threads low, as some Linux	1014	It is recommended to keep the number of threads relatively low, as some
695	kernel versions will scale negatively with the number of threads (higher	1015	Linux kernel versions will scale negatively with the number of threads
696	parallelity => MUCH higher latency). With current Linux 2.6 versions, 4-32	1016	(higher parallelity => MUCH higher latency). With current Linux 2.6
697	threads should be fine.	1017	versions, 4-32 threads should be fine.
698		1018
699	Under most circumstances you don't need to call this function, as the	1019	Under most circumstances you don't need to call this function, as the
700	module selects a default that is suitable for low to moderate load.	1020	module selects a default that is suitable for low to moderate load.
701		1021
702	=item IO::AIO::max_parallel $nthreads	1022	=item IO::AIO::max_parallel $nthreads
…		…
711	This module automatically runs C<max_parallel 0> at program end, to ensure	1031	This module automatically runs C<max_parallel 0> at program end, to ensure
712	that all threads are killed and that there are no outstanding requests.	1032	that all threads are killed and that there are no outstanding requests.
713		1033
714	Under normal circumstances you don't need to call this function.	1034	Under normal circumstances you don't need to call this function.
715		1035
		1036	=item IO::AIO::max_idle $nthreads
		1037
		1038	Limit the number of threads (default: 4) that are allowed to idle (i.e.,
		1039	threads that did not get a request to process within 10 seconds). That
		1040	means if a thread becomes idle while C<$nthreads> other threads are also
		1041	idle, it will free its resources and exit.
		1042
		1043	This is useful when you allow a large number of threads (e.g. 100 or 1000)
		1044	to allow for extremely high load situations, but want to free resources
		1045	under normal circumstances (1000 threads can easily consume 30MB of RAM).
		1046
		1047	The default is probably ok in most situations, especially if thread
		1048	creation is fast. If thread creation is very slow on your system you might
		1049	want to use larger values.
		1050
716	=item $oldnreqs = IO::AIO::max_outstanding $nreqs	1051	=item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs
		1052
		1053	This is a very bad function to use in interactive programs because it
		1054	blocks, and a bad way to reduce concurrency because it is inexact: Better
		1055	use an C<aio_group> together with a feed callback.
717		1056
718	Sets the maximum number of outstanding requests to C<$nreqs>. If you	1057	Sets the maximum number of outstanding requests to C<$nreqs>. If you
719	try to queue up more than this number of requests, the caller will block until	1058	to queue up more than this number of requests, the next call to the
720	some requests have been handled.	1059	C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>)
		1060	function will block until the limit is no longer exceeded.
721		1061
722	The default is very large, so normally there is no practical limit. If you	1062	The default value is very large, so there is no practical limit on the
723	queue up many requests in a loop it often improves speed if you set	1063	number of outstanding requests.
724	this to a relatively low number, such as C<100>.
725		1064
726	Under normal circumstances you don't need to call this function.	1065	You can still queue as many requests as you want. Therefore,
		1066	C<max_oustsanding> is mainly useful in simple scripts (with low values) or
		1067	as a stop gap to shield against fatal memory overflow (with large values).
		1068
		1069	=head3 STATISTICAL INFORMATION
		1070
		1071	=item IO::AIO::nreqs
		1072
		1073	Returns the number of requests currently in the ready, execute or pending
		1074	states (i.e. for which their callback has not been invoked yet).
		1075
		1076	Example: wait till there are no outstanding requests anymore:
		1077
		1078	IO::AIO::poll_wait, IO::AIO::poll_cb
		1079	while IO::AIO::nreqs;
		1080
		1081	=item IO::AIO::nready
		1082
		1083	Returns the number of requests currently in the ready state (not yet
		1084	executed).
		1085
		1086	=item IO::AIO::npending
		1087
		1088	Returns the number of requests currently in the pending state (executed,
		1089	but not yet processed by poll_cb).
727		1090
728	=back	1091	=back
729		1092
730	=cut	1093	=cut
731		1094
…		…
743	or return undef;	1106	or return undef;
744		1107
745	*$sym	1108	*$sym
746	}	1109	}
747		1110
748	min_parallel 4;	1111	min_parallel 8;
749		1112
750	END {	1113	END {
751	max_parallel 0;	1114	min_parallel 1;
752	}	1115	flush;
		1116	};
753		1117
754	1;	1118	1;
755		1119
756	=head2 FORK BEHAVIOUR	1120	=head2 FORK BEHAVIOUR
757		1121
758	This module should do "the right thing" when the process using it forks:	1122	This module should do "the right thing" when the process using it forks:
759		1123
760	Before the fork, IO::AIO enters a quiescent state where no requests	1124	Before the fork, IO::AIO enters a quiescent state where no requests
761	can be added in other threads and no results will be processed. After	1125	can be added in other threads and no results will be processed. After
762	the fork the parent simply leaves the quiescent state and continues	1126	the fork the parent simply leaves the quiescent state and continues
763	request/result processing, while the child clears the request/result	1127	request/result processing, while the child frees the request/result queue
764	queue (so the requests started before the fork will only be handled in	1128	(so that the requests started before the fork will only be handled in the
765	the parent). Threads will be started on demand until the limit ste in the	1129	parent). Threads will be started on demand until the limit set in the
766	parent process has been reached again.	1130	parent process has been reached again.
767		1131
768	In short: the parent will, after a short pause, continue as if fork had	1132	In short: the parent will, after a short pause, continue as if fork had
769	not been called, while the child will act as if IO::AIO has not been used	1133	not been called, while the child will act as if IO::AIO has not been used
770	yet.	1134	yet.
771		1135
		1136	=head2 MEMORY USAGE
		1137
		1138	Per-request usage:
		1139
		1140	Each aio request uses - depending on your architecture - around 100-200
		1141	bytes of memory. In addition, stat requests need a stat buffer (possibly
		1142	a few hundred bytes), readdir requires a result buffer and so on. Perl
		1143	scalars and other data passed into aio requests will also be locked and
		1144	will consume memory till the request has entered the done state.
		1145
		1146	This is now awfully much, so queuing lots of requests is not usually a
		1147	problem.
		1148
		1149	Per-thread usage:
		1150
		1151	In the execution phase, some aio requests require more memory for
		1152	temporary buffers, and each thread requires a stack and other data
		1153	structures (usually around 16k-128k, depending on the OS).
		1154
		1155	=head1 KNOWN BUGS
		1156
		1157	Known bugs will be fixed in the next release.
		1158
772	=head1 SEE ALSO	1159	=head1 SEE ALSO
773		1160
774	L<Coro>, L<Linux::AIO> (obsolete).	1161	L<Coro::AIO>.
775		1162
776	=head1 AUTHOR	1163	=head1 AUTHOR
777		1164
778	Marc Lehmann <schmorp@schmorp.de>	1165	Marc Lehmann <schmorp@schmorp.de>
779	http://home.schmorp.de/	1166	http://home.schmorp.de/

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.56 by root, Sun Oct 22 00:53:47 2006 UTC vs. Revision 1.90 by root, Mon Oct 30 23:30:00 2006 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.56 by root, Sun Oct 22 00:53:47 2006 UTC vs.
Revision 1.90 by root, Mon Oct 30 23:30:00 2006 UTC