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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.115 by root, Mon Sep 24 18:14:00 2007 UTC vs.
Revision 1.166 by root, Thu Nov 12 00:01:52 2009 UTC

…		…
26	$req->cancel; # cancel request if still in queue	26	$req->cancel; # cancel request if still in queue
27		27
28	my $grp = aio_group sub { print "all stats done\n" };	28	my $grp = aio_group sub { print "all stats done\n" };
29	add $grp aio_stat "..." for ...;	29	add $grp aio_stat "..." for ...;
30		30
		31	# AnyEvent integration (EV, Event, Glib, Tk, POE, urxvt, pureperl...)
		32	use AnyEvent::AIO;
		33
31	# AnyEvent integration	34	# EV integration
32	open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!";	35	my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb;
33	my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb });
34		36
35	# Event integration	37	# Event integration
36	Event->io (fd => IO::AIO::poll_fileno,	38	Event->io (fd => IO::AIO::poll_fileno,
37	poll => 'r',	39	poll => 'r',
38	cb => \&IO::AIO::poll_cb);	40	cb => \&IO::AIO::poll_cb);
…		…
50	\&IO::AIO::poll_cb);	52	\&IO::AIO::poll_cb);
51		53
52	=head1 DESCRIPTION	54	=head1 DESCRIPTION
53		55
54	This module implements asynchronous I/O using whatever means your	56	This module implements asynchronous I/O using whatever means your
55	operating system supports.	57	operating system supports. It is implemented as an interface to C<libeio>
		58	(L<http://software.schmorp.de/pkg/libeio.html>).
56		59
57	Asynchronous means that operations that can normally block your program	60	Asynchronous means that operations that can normally block your program
58	(e.g. reading from disk) will be done asynchronously: the operation	61	(e.g. reading from disk) will be done asynchronously: the operation
59	will still block, but you can do something else in the meantime. This	62	will still block, but you can do something else in the meantime. This
60	is extremely useful for programs that need to stay interactive even	63	is extremely useful for programs that need to stay interactive even
…		…
64	on a RAID volume or over NFS when you do a number of stat operations	67	on a RAID volume or over NFS when you do a number of stat operations
65	concurrently.	68	concurrently.
66		69
67	While most of this works on all types of file descriptors (for	70	While most of this works on all types of file descriptors (for
68	example sockets), using these functions on file descriptors that	71	example sockets), using these functions on file descriptors that
69	support nonblocking operation (again, sockets, pipes etc.) is very	72	support nonblocking operation (again, sockets, pipes etc.) is
70	inefficient. Use an event loop for that (such as the L<Event\|Event>	73	very inefficient. Use an event loop for that (such as the L<EV>
71	module): IO::AIO will naturally fit into such an event loop itself.	74	module): IO::AIO will naturally fit into such an event loop itself.
72		75
73	In this version, a number of threads are started that execute your	76	In this version, a number of threads are started that execute your
74	requests and signal their completion. You don't need thread support	77	requests and signal their completion. You don't need thread support
75	in perl, and the threads created by this module will not be visible	78	in perl, and the threads created by this module will not be visible
…		…
85	yourself, always call C<poll_cb> from within the same thread, or never	88	yourself, always call C<poll_cb> from within the same thread, or never
86	call C<poll_cb> (or other C<aio_> functions) recursively.	89	call C<poll_cb> (or other C<aio_> functions) recursively.
87		90
88	=head2 EXAMPLE	91	=head2 EXAMPLE
89		92
90	This is a simple example that uses the Event module and loads	93	This is a simple example that uses the EV module and loads
91	F</etc/passwd> asynchronously:	94	F</etc/passwd> asynchronously:
92		95
93	use Fcntl;	96	use Fcntl;
94	use Event;	97	use EV;
95	use IO::AIO;	98	use IO::AIO;
96		99
97	# register the IO::AIO callback with Event	100	# register the IO::AIO callback with EV
98	Event->io (fd => IO::AIO::poll_fileno,	101	my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb;
99	poll => 'r',
100	cb => \&IO::AIO::poll_cb);
101		102
102	# queue the request to open /etc/passwd	103	# queue the request to open /etc/passwd
103	aio_open "/etc/passwd", O_RDONLY, 0, sub {	104	aio_open "/etc/passwd", O_RDONLY, 0, sub {
104	my $fh = shift	105	my $fh = shift
105	or die "error while opening: $!";	106	or die "error while opening: $!";
…		…
117		118
118	# file contents now in $contents	119	# file contents now in $contents
119	print $contents;	120	print $contents;
120		121
121	# exit event loop and program	122	# exit event loop and program
122	Event::unloop;	123	EV::unloop;
123	};	124	};
124	};	125	};
125		126
126	# possibly queue up other requests, or open GUI windows,	127	# possibly queue up other requests, or open GUI windows,
127	# check for sockets etc. etc.	128	# check for sockets etc. etc.
128		129
129	# process events as long as there are some:	130	# process events as long as there are some:
130	Event::loop;	131	EV::loop;
131		132
132	=head1 REQUEST ANATOMY AND LIFETIME	133	=head1 REQUEST ANATOMY AND LIFETIME
133		134
134	Every C<aio_*> function creates a request. which is a C data structure not	135	Every C<aio_*> function creates a request. which is a C data structure not
135	directly visible to Perl.	136	directly visible to Perl.
…		…
183		184
184	=cut	185	=cut
185		186
186	package IO::AIO;	187	package IO::AIO;
187		188
188	no warnings;	189	use Carp ();
189	use strict 'vars';	190
		191	use common::sense;
190		192
191	use base 'Exporter';	193	use base 'Exporter';
192		194
193	BEGIN {	195	BEGIN {
194	our $VERSION = '2.41';	196	our $VERSION = '3.3';
195		197
196	our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat	198	our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close
197	aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink	199	aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx
198	aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link	200	aio_scandir aio_symlink aio_readlink aio_sync aio_fsync
		201	aio_fdatasync aio_sync_file_range aio_pathsync aio_readahead
		202	aio_rename aio_link aio_move aio_copy aio_group
199	aio_move aio_copy aio_group aio_nop aio_mknod aio_load aio_rmtree aio_mkdir	203	aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown
200	aio_chown aio_chmod aio_utime aio_truncate);	204	aio_chmod aio_utime aio_truncate);
		205
201	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice aio_block));	206	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));
202	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush	207	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
203	min_parallel max_parallel max_idle	208	min_parallel max_parallel max_idle
204	nreqs nready npending nthreads	209	nreqs nready npending nthreads
205	max_poll_time max_poll_reqs);	210	max_poll_time max_poll_reqs
		211	sendfile fadvise);
		212
		213	push @AIO_REQ, qw(aio_busy); # not exported
206		214
207	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';	215	@IO::AIO::GRP::ISA = 'IO::AIO::REQ';
208		216
209	require XSLoader;	217	require XSLoader;
210	XSLoader::load ("IO::AIO", $VERSION);	218	XSLoader::load ("IO::AIO", $VERSION);
…		…
217	All the C<aio_*> calls are more or less thin wrappers around the syscall	225	All the C<aio_*> calls are more or less thin wrappers around the syscall
218	with the same name (sans C<aio_>). The arguments are similar or identical,	226	with the same name (sans C<aio_>). The arguments are similar or identical,
219	and they all accept an additional (and optional) C<$callback> argument	227	and they all accept an additional (and optional) C<$callback> argument
220	which must be a code reference. This code reference will get called with	228	which must be a code reference. This code reference will get called with
221	the syscall return code (e.g. most syscalls return C<-1> on error, unlike	229	the syscall return code (e.g. most syscalls return C<-1> on error, unlike
222	perl, which usually delivers "false") as it's sole argument when the given	230	perl, which usually delivers "false") as its sole argument after the given
223	syscall has been executed asynchronously.	231	syscall has been executed asynchronously.
224		232
225	All functions expecting a filehandle keep a copy of the filehandle	233	All functions expecting a filehandle keep a copy of the filehandle
226	internally until the request has finished.	234	internally until the request has finished.
227		235
…		…
241	your pathnames to the locale (or other) encoding in effect in the user	249	your pathnames to the locale (or other) encoding in effect in the user
242	environment, d) use Glib::filename_from_unicode on unicode filenames or e)	250	environment, d) use Glib::filename_from_unicode on unicode filenames or e)
243	use something else to ensure your scalar has the correct contents.	251	use something else to ensure your scalar has the correct contents.
244		252
245	This works, btw. independent of the internal UTF-8 bit, which IO::AIO	253	This works, btw. independent of the internal UTF-8 bit, which IO::AIO
246	handles correctly wether it is set or not.	254	handles correctly whether it is set or not.
247		255
248	=over 4	256	=over 4
249		257
250	=item $prev_pri = aioreq_pri [$pri]	258	=item $prev_pri = aioreq_pri [$pri]
251		259
…		…
311		319
312		320
313	=item aio_close $fh, $callback->($status)	321	=item aio_close $fh, $callback->($status)
314		322
315	Asynchronously close a file and call the callback with the result	323	Asynchronously close a file and call the callback with the result
316	code. I<WARNING:> although accepted, you should not pass in a perl	324	code.
317	filehandle here, as perl will likely close the file descriptor another
318	time when the filehandle is destroyed. Normally, you can safely call perls
319	C<close> or just let filehandles go out of scope.
320		325
321	This is supposed to be a bug in the API, so that might change. It's	326	Unfortunately, you can't do this to perl. Perl I<insists> very strongly on
322	therefore best to avoid this function.	327	closing the file descriptor associated with the filehandle itself.
323		328
		329	Therefore, C<aio_close> will not close the filehandle - instead it will
		330	use dup2 to overwrite the file descriptor with the write-end of a pipe
		331	(the pipe fd will be created on demand and will be cached).
		332
		333	Or in other words: the file descriptor will be closed, but it will not be
		334	free for reuse until the perl filehandle is closed.
		335
		336	=cut
324		337
325	=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)	338	=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
326		339
327	=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)	340	=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
328		341
329	Reads or writes C<$length> bytes from the specified C<$fh> and C<$offset>	342	Reads or writes C<$length> bytes from or to the specified C<$fh> and
330	into the scalar given by C<$data> and offset C<$dataoffset> and calls the	343	C<$offset> into the scalar given by C<$data> and offset C<$dataoffset>
331	callback without the actual number of bytes read (or -1 on error, just	344	and calls the callback without the actual number of bytes read (or -1 on
332	like the syscall).	345	error, just like the syscall).
		346
		347	C<aio_read> will, like C<sysread>, shrink or grow the C<$data> scalar to
		348	offset plus the actual number of bytes read.
333		349
334	If C<$offset> is undefined, then the current file descriptor offset will	350	If C<$offset> is undefined, then the current file descriptor offset will
335	be used (and updated), otherwise the file descriptor offset will not be	351	be used (and updated), otherwise the file descriptor offset will not be
336	changed by these calls.	352	changed by these calls.
337		353
338	If C<$length> is undefined in C<aio_write>, use the remaining length of C<$data>.	354	If C<$length> is undefined in C<aio_write>, use the remaining length of
		355	C<$data>.
339		356
340	If C<$dataoffset> is less than zero, it will be counted from the end of	357	If C<$dataoffset> is less than zero, it will be counted from the end of
341	C<$data>.	358	C<$data>.
342		359
343	The C<$data> scalar I<MUST NOT> be modified in any way while the request	360	The C<$data> scalar I<MUST NOT> be modified in any way while the request
…		…
515		532
516	Unlike the POSIX call of the same name, C<aio_readdir> reads an entire	533	Unlike the POSIX call of the same name, C<aio_readdir> reads an entire
517	directory (i.e. opendir + readdir + closedir). The entries will not be	534	directory (i.e. opendir + readdir + closedir). The entries will not be
518	sorted, and will B<NOT> include the C<.> and C<..> entries.	535	sorted, and will B<NOT> include the C<.> and C<..> entries.
519		536
520	The callback a single argument which is either C<undef> or an array-ref	537	The callback is passed a single argument which is either C<undef> or an
521	with the filenames.	538	array-ref with the filenames.
		539
		540
		541	=item aio_readdirx $pathname, $flags, $callback->($entries, $flags)
		542
		543	Quite similar to C<aio_readdir>, but the C<$flags> argument allows to tune
		544	behaviour and output format. In case of an error, C<$entries> will be
		545	C<undef>.
		546
		547	The flags are a combination of the following constants, ORed together (the
		548	flags will also be passed to the callback, possibly modified):
		549
		550	=over 4
		551
		552	=item IO::AIO::READDIR_DENTS
		553
		554	When this flag is off, then the callback gets an arrayref with of names
		555	only (as with C<aio_readdir>), otherwise it gets an arrayref with
		556	C<[$name, $type, $inode]> arrayrefs, each describing a single directory
		557	entry in more detail.
		558
		559	C<$name> is the name of the entry.
		560
		561	C<$type> is one of the C<IO::AIO::DT_xxx> constants:
		562
		563	C<IO::AIO::DT_UNKNOWN>, C<IO::AIO::DT_FIFO>, C<IO::AIO::DT_CHR>, C<IO::AIO::DT_DIR>,
		564	C<IO::AIO::DT_BLK>, C<IO::AIO::DT_REG>, C<IO::AIO::DT_LNK>, C<IO::AIO::DT_SOCK>,
		565	C<IO::AIO::DT_WHT>.
		566
		567	C<IO::AIO::DT_UNKNOWN> means just that: readdir does not know. If you need to
		568	know, you have to run stat yourself. Also, for speed reasons, the C<$type>
		569	scalars are read-only: you can not modify them.
		570
		571	C<$inode> is the inode number (which might not be exact on systems with 64
		572	bit inode numbers and 32 bit perls). This field has unspecified content on
		573	systems that do not deliver the inode information.
		574
		575	=item IO::AIO::READDIR_DIRS_FIRST
		576
		577	When this flag is set, then the names will be returned in an order where
		578	likely directories come first. This is useful when you need to quickly
		579	find directories, or you want to find all directories while avoiding to
		580	stat() each entry.
		581
		582	If the system returns type information in readdir, then this is used
		583	to find directories directly. Otherwise, likely directories are files
		584	beginning with ".", or otherwise files with no dots, of which files with
		585	short names are tried first.
		586
		587	=item IO::AIO::READDIR_STAT_ORDER
		588
		589	When this flag is set, then the names will be returned in an order
		590	suitable for stat()'ing each one. That is, when you plan to stat()
		591	all files in the given directory, then the returned order will likely
		592	be fastest.
		593
		594	If both this flag and C<IO::AIO::READDIR_DIRS_FIRST> are specified, then
		595	the likely dirs come first, resulting in a less optimal stat order.
		596
		597	=item IO::AIO::READDIR_FOUND_UNKNOWN
		598
		599	This flag should not be set when calling C<aio_readdirx>. Instead, it
		600	is being set by C<aio_readdirx>, when any of the C<$type>'s found were
		601	C<IO::AIO::DT_UNKNOWN>. The absense of this flag therefore indicates that all
		602	C<$type>'s are known, which can be used to speed up some algorithms.
		603
		604	=back
522		605
523		606
524	=item aio_load $path, $data, $callback->($status)	607	=item aio_load $path, $data, $callback->($status)
525		608
526	This is a composite request that tries to fully load the given file into	609	This is a composite request that tries to fully load the given file into
527	memory. Status is the same as with aio_read.	610	memory. Status is the same as with aio_read.
528		611
529	=cut	612	=cut
530		613
531	sub aio_load($$;$) {	614	sub aio_load($$;$) {
532	aio_block {
533	my ($path, undef, $cb) = @_;	615	my ($path, undef, $cb) = @_;
534	my $data = \$_[1];	616	my $data = \$_[1];
535		617
536	my $pri = aioreq_pri;	618	my $pri = aioreq_pri;
537	my $grp = aio_group $cb;	619	my $grp = aio_group $cb;
		620
		621	aioreq_pri $pri;
		622	add $grp aio_open $path, O_RDONLY, 0, sub {
		623	my $fh = shift
		624	or return $grp->result (-1);
538		625
539	aioreq_pri $pri;	626	aioreq_pri $pri;
540	add $grp aio_open $path, O_RDONLY, 0, sub {
541	my $fh = shift
542	or return $grp->result (-1);
543
544	aioreq_pri $pri;
545	add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub {	627	add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub {
546	$grp->result ($_[0]);	628	$grp->result ($_[0]);
547	};
548	};	629	};
549
550	$grp
551	}	630	};
		631
		632	$grp
552	}	633	}
553		634
554	=item aio_copy $srcpath, $dstpath, $callback->($status)	635	=item aio_copy $srcpath, $dstpath, $callback->($status)
555		636
556	Try to copy the I<file> (directories not supported as either source or	637	Try to copy the I<file> (directories not supported as either source or
557	destination) from C<$srcpath> to C<$dstpath> and call the callback with	638	destination) from C<$srcpath> to C<$dstpath> and call the callback with
558	the C<0> (error) or C<-1> ok.	639	a status of C<0> (ok) or C<-1> (error, see C<$!>).
559		640
560	This is a composite request that it creates the destination file with	641	This is a composite request that creates the destination file with
561	mode 0200 and copies the contents of the source file into it using	642	mode 0200 and copies the contents of the source file into it using
562	C<aio_sendfile>, followed by restoring atime, mtime, access mode and	643	C<aio_sendfile>, followed by restoring atime, mtime, access mode and
563	uid/gid, in that order.	644	uid/gid, in that order.
564		645
565	If an error occurs, the partial destination file will be unlinked, if	646	If an error occurs, the partial destination file will be unlinked, if
…		…
567	errors are being ignored.	648	errors are being ignored.
568		649
569	=cut	650	=cut
570		651
571	sub aio_copy($$;$) {	652	sub aio_copy($$;$) {
572	aio_block {
573	my ($src, $dst, $cb) = @_;	653	my ($src, $dst, $cb) = @_;
574		654
575	my $pri = aioreq_pri;	655	my $pri = aioreq_pri;
576	my $grp = aio_group $cb;	656	my $grp = aio_group $cb;
577		657
578	aioreq_pri $pri;	658	aioreq_pri $pri;
579	add $grp aio_open $src, O_RDONLY, 0, sub {	659	add $grp aio_open $src, O_RDONLY, 0, sub {
580	if (my $src_fh = $_[0]) {	660	if (my $src_fh = $_[0]) {
581	my @stat = stat $src_fh;	661	my @stat = stat $src_fh; # hmm, might block over nfs?
582		662
583	aioreq_pri $pri;	663	aioreq_pri $pri;
584	add $grp aio_open $dst, O_CREAT \| O_WRONLY \| O_TRUNC, 0200, sub {	664	add $grp aio_open $dst, O_CREAT \| O_WRONLY \| O_TRUNC, 0200, sub {
585	if (my $dst_fh = $_[0]) {	665	if (my $dst_fh = $_[0]) {
586	aioreq_pri $pri;	666	aioreq_pri $pri;
587	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {	667	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
588	if ($_[0] == $stat[7]) {	668	if ($_[0] == $stat[7]) {
589	$grp->result (0);	669	$grp->result (0);
590	close $src_fh;	670	close $src_fh;
591		671
592	# those should not normally block. should. should.
593	utime $stat[8], $stat[9], $dst;
594	chmod $stat[2] & 07777, $dst_fh;
595	chown $stat[4], $stat[5], $dst_fh;
596	close $dst_fh;
597	} else {	672	my $ch = sub {
598	$grp->result (-1);
599	close $src_fh;
600	close $dst_fh;
601
602	aioreq $pri;	673	aioreq_pri $pri;
		674	add $grp aio_chmod $dst_fh, $stat[2] & 07777, sub {
		675	aioreq_pri $pri;
		676	add $grp aio_chown $dst_fh, $stat[4], $stat[5], sub {
		677	aioreq_pri $pri;
603	add $grp aio_unlink $dst;	678	add $grp aio_close $dst_fh;
		679	}
		680	};
604	}	681	};
		682
		683	aioreq_pri $pri;
		684	add $grp aio_utime $dst_fh, $stat[8], $stat[9], sub {
		685	if ($_[0] < 0 && $! == ENOSYS) {
		686	aioreq_pri $pri;
		687	add $grp aio_utime $dst, $stat[8], $stat[9], $ch;
		688	} else {
		689	$ch->();
		690	}
		691	};
		692	} else {
		693	$grp->result (-1);
		694	close $src_fh;
		695	close $dst_fh;
		696
		697	aioreq $pri;
		698	add $grp aio_unlink $dst;
605	};	699	}
606	} else {
607	$grp->result (-1);
608	}	700	};
		701	} else {
		702	$grp->result (-1);
609	},	703	}
610
611	} else {
612	$grp->result (-1);
613	}	704	},
		705
		706	} else {
		707	$grp->result (-1);
614	};	708	}
615
616	$grp
617	}	709	};
		710
		711	$grp
618	}	712	}
619		713
620	=item aio_move $srcpath, $dstpath, $callback->($status)	714	=item aio_move $srcpath, $dstpath, $callback->($status)
621		715
622	Try to move the I<file> (directories not supported as either source or	716	Try to move the I<file> (directories not supported as either source or
623	destination) from C<$srcpath> to C<$dstpath> and call the callback with	717	destination) from C<$srcpath> to C<$dstpath> and call the callback with
624	the C<0> (error) or C<-1> ok.	718	a status of C<0> (ok) or C<-1> (error, see C<$!>).
625		719
626	This is a composite request that tries to rename(2) the file first. If	720	This is a composite request that tries to rename(2) the file first; if
627	rename files with C<EXDEV>, it copies the file with C<aio_copy> and, if	721	rename fails with C<EXDEV>, it copies the file with C<aio_copy> and, if
628	that is successful, unlinking the C<$srcpath>.	722	that is successful, unlinks the C<$srcpath>.
629		723
630	=cut	724	=cut
631		725
632	sub aio_move($$;$) {	726	sub aio_move($$;$) {
633	aio_block {
634	my ($src, $dst, $cb) = @_;	727	my ($src, $dst, $cb) = @_;
635		728
636	my $pri = aioreq_pri;	729	my $pri = aioreq_pri;
637	my $grp = aio_group $cb;	730	my $grp = aio_group $cb;
638		731
639	aioreq_pri $pri;	732	aioreq_pri $pri;
640	add $grp aio_rename $src, $dst, sub {	733	add $grp aio_rename $src, $dst, sub {
641	if ($_[0] && $! == EXDEV) {	734	if ($_[0] && $! == EXDEV) {
642	aioreq_pri $pri;	735	aioreq_pri $pri;
643	add $grp aio_copy $src, $dst, sub {	736	add $grp aio_copy $src, $dst, sub {
644	$grp->result ($_[0]);
645
646	if (!$_[0]) {
647	aioreq_pri $pri;
648	add $grp aio_unlink $src;
649	}
650	};
651	} else {
652	$grp->result ($_[0]);	737	$grp->result ($_[0]);
		738
		739	if (!$_[0]) {
		740	aioreq_pri $pri;
		741	add $grp aio_unlink $src;
		742	}
653	}	743	};
		744	} else {
		745	$grp->result ($_[0]);
654	};	746	}
655
656	$grp
657	}	747	};
		748
		749	$grp
658	}	750	}
659		751
660	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)	752	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
661		753
662	Scans a directory (similar to C<aio_readdir>) but additionally tries to	754	Scans a directory (similar to C<aio_readdir>) but additionally tries to
…		…
682		774
683	Implementation notes.	775	Implementation notes.
684		776
685	The C<aio_readdir> cannot be avoided, but C<stat()>'ing every entry can.	777	The C<aio_readdir> cannot be avoided, but C<stat()>'ing every entry can.
686		778
		779	If readdir returns file type information, then this is used directly to
		780	find directories.
		781
687	After reading the directory, the modification time, size etc. of the	782	Otherwise, after reading the directory, the modification time, size etc.
688	directory before and after the readdir is checked, and if they match (and	783	of the directory before and after the readdir is checked, and if they
689	isn't the current time), the link count will be used to decide how many	784	match (and isn't the current time), the link count will be used to decide
690	entries are directories (if >= 2). Otherwise, no knowledge of the number	785	how many entries are directories (if >= 2). Otherwise, no knowledge of the
691	of subdirectories will be assumed.	786	number of subdirectories will be assumed.
692		787
693	Then entries will be sorted into likely directories (everything without	788	Then entries will be sorted into likely directories a non-initial dot
694	a non-initial dot currently) and likely non-directories (everything	789	currently) and likely non-directories (see C<aio_readdirx>). Then every
695	else). Then every entry plus an appended C</.> will be C<stat>'ed,	790	entry plus an appended C</.> will be C<stat>'ed, likely directories first,
696	likely directories first. If that succeeds, it assumes that the entry	791	in order of their inode numbers. If that succeeds, it assumes that the
697	is a directory or a symlink to directory (which will be checked	792	entry is a directory or a symlink to directory (which will be checked
698	seperately). This is often faster than stat'ing the entry itself because	793	seperately). This is often faster than stat'ing the entry itself because
699	filesystems might detect the type of the entry without reading the inode	794	filesystems might detect the type of the entry without reading the inode
700	data (e.g. ext2fs filetype feature).	795	data (e.g. ext2fs filetype feature), even on systems that cannot return
		796	the filetype information on readdir.
701		797
702	If the known number of directories (link count - 2) has been reached, the	798	If the known number of directories (link count - 2) has been reached, the
703	rest of the entries is assumed to be non-directories.	799	rest of the entries is assumed to be non-directories.
704		800
705	This only works with certainty on POSIX (= UNIX) filesystems, which	801	This only works with certainty on POSIX (= UNIX) filesystems, which
…		…
710	directory counting heuristic.	806	directory counting heuristic.
711		807
712	=cut	808	=cut
713		809
714	sub aio_scandir($$;$) {	810	sub aio_scandir($$;$) {
715	aio_block {
716	my ($path, $maxreq, $cb) = @_;	811	my ($path, $maxreq, $cb) = @_;
717		812
718	my $pri = aioreq_pri;	813	my $pri = aioreq_pri;
719		814
720	my $grp = aio_group $cb;	815	my $grp = aio_group $cb;
721		816
722	$maxreq = 4 if $maxreq <= 0;	817	$maxreq = 4 if $maxreq <= 0;
723		818
724	# stat once	819	# stat once
		820	aioreq_pri $pri;
		821	add $grp aio_stat $path, sub {
		822	return $grp->result () if $_[0];
		823	my $now = time;
		824	my $hash1 = join ":", (stat _)[0,1,3,7,9];
		825
		826	# read the directory entries
725	aioreq_pri $pri;	827	aioreq_pri $pri;
726	add $grp aio_stat $path, sub {	828	add $grp aio_readdirx $path, READDIR_DIRS_FIRST, sub {
		829	my $entries = shift
727	return $grp->result () if $_[0];	830	or return $grp->result ();
728	my $now = time;
729	my $hash1 = join ":", (stat _)[0,1,3,7,9];
730		831
731	# read the directory entries	832	# stat the dir another time
732	aioreq_pri $pri;	833	aioreq_pri $pri;
733	add $grp aio_readdir $path, sub {
734	my $entries = shift
735	or return $grp->result ();
736
737	# stat the dir another time
738	aioreq_pri $pri;
739	add $grp aio_stat $path, sub {	834	add $grp aio_stat $path, sub {
740	my $hash2 = join ":", (stat _)[0,1,3,7,9];	835	my $hash2 = join ":", (stat _)[0,1,3,7,9];
741		836
742	my $ndirs;	837	my $ndirs;
743		838
744	# take the slow route if anything looks fishy	839	# take the slow route if anything looks fishy
745	if ($hash1 ne $hash2 or (stat _)[9] == $now) {	840	if ($hash1 ne $hash2 or (stat _)[9] == $now) {
746	$ndirs = -1;	841	$ndirs = -1;
747	} else {	842	} else {
748	# if nlink == 2, we are finished	843	# if nlink == 2, we are finished
749	# on non-posix-fs's, we rely on nlink < 2	844	# for non-posix-fs's, we rely on nlink < 2
750	$ndirs = (stat _)[3] - 2	845	$ndirs = (stat _)[3] - 2
751	or return $grp->result ([], $entries);	846	or return $grp->result ([], $entries);
752	}	847	}
753		848
754	# sort into likely dirs and likely nondirs
755	# dirs == files without ".", short entries first
756	$entries = [map $_->[0],
757	sort { $b->[1] cmp $a->[1] }
758	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
759	@$entries];
760
761	my (@dirs, @nondirs);	849	my (@dirs, @nondirs);
762		850
763	my $statgrp = add $grp aio_group sub {	851	my $statgrp = add $grp aio_group sub {
764	$grp->result (\@dirs, \@nondirs);	852	$grp->result (\@dirs, \@nondirs);
765	};	853	};
766		854
767	limit $statgrp $maxreq;	855	limit $statgrp $maxreq;
768	feed $statgrp sub {	856	feed $statgrp sub {
769	return unless @$entries;	857	return unless @$entries;
770	my $entry = pop @$entries;	858	my $entry = shift @$entries;
771		859
772	aioreq_pri $pri;	860	aioreq_pri $pri;
773	add $statgrp aio_stat "$path/$entry/.", sub {	861	add $statgrp aio_stat "$path/$entry/.", sub {
774	if ($_[0] < 0) {	862	if ($_[0] < 0) {
775	push @nondirs, $entry;	863	push @nondirs, $entry;
776	} else {	864	} else {
777	# need to check for real directory	865	# need to check for real directory
778	aioreq_pri $pri;	866	aioreq_pri $pri;
779	add $statgrp aio_lstat "$path/$entry", sub {	867	add $statgrp aio_lstat "$path/$entry", sub {
780	if (-d _) {	868	if (-d _) {
781	push @dirs, $entry;	869	push @dirs, $entry;
782		870
783	unless (--$ndirs) {	871	unless (--$ndirs) {
784	push @nondirs, @$entries;	872	push @nondirs, @$entries;
785	feed $statgrp;	873	feed $statgrp;
786	}
787	} else {
788	push @nondirs, $entry;
789	}	874	}
		875	} else {
		876	push @nondirs, $entry;
790	}	877	}
791	}	878	}
792	};	879	}
793	};	880	};
794	};	881	};
795	};	882	};
796	};	883	};
797
798	$grp
799	}	884	};
		885
		886	$grp
800	}	887	}
801		888
802	=item aio_rmtree $path, $callback->($status)	889	=item aio_rmtree $path, $callback->($status)
803		890
804	Delete a directory tree starting (and including) C<$path>, return the	891	Delete a directory tree starting (and including) C<$path>, return the
…		…
808		895
809	=cut	896	=cut
810		897
811	sub aio_rmtree;	898	sub aio_rmtree;
812	sub aio_rmtree($;$) {	899	sub aio_rmtree($;$) {
813	aio_block {
814	my ($path, $cb) = @_;	900	my ($path, $cb) = @_;
815		901
816	my $pri = aioreq_pri;	902	my $pri = aioreq_pri;
817	my $grp = aio_group $cb;	903	my $grp = aio_group $cb;
818		904
819	aioreq_pri $pri;	905	aioreq_pri $pri;
820	add $grp aio_scandir $path, 0, sub {	906	add $grp aio_scandir $path, 0, sub {
821	my ($dirs, $nondirs) = @_;	907	my ($dirs, $nondirs) = @_;
822		908
823	my $dirgrp = aio_group sub {	909	my $dirgrp = aio_group sub {
824	add $grp aio_rmdir $path, sub {	910	add $grp aio_rmdir $path, sub {
825	$grp->result ($_[0]);	911	$grp->result ($_[0]);
826	};
827	};	912	};
828
829	(aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs;
830	(aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs;
831
832	add $grp $dirgrp;
833	};	913	};
834		914
835	$grp	915	(aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs;
		916	(aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs;
		917
		918	add $grp $dirgrp;
836	}	919	};
		920
		921	$grp
837	}	922	}
		923
		924	=item aio_sync $callback->($status)
		925
		926	Asynchronously call sync and call the callback when finished.
838		927
839	=item aio_fsync $fh, $callback->($status)	928	=item aio_fsync $fh, $callback->($status)
840		929
841	Asynchronously call fsync on the given filehandle and call the callback	930	Asynchronously call fsync on the given filehandle and call the callback
842	with the fsync result code.	931	with the fsync result code.
…		…
846	Asynchronously call fdatasync on the given filehandle and call the	935	Asynchronously call fdatasync on the given filehandle and call the
847	callback with the fdatasync result code.	936	callback with the fdatasync result code.
848		937
849	If this call isn't available because your OS lacks it or it couldn't be	938	If this call isn't available because your OS lacks it or it couldn't be
850	detected, it will be emulated by calling C<fsync> instead.	939	detected, it will be emulated by calling C<fsync> instead.
		940
		941	=item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status)
		942
		943	Sync the data portion of the file specified by C<$offset> and C<$length>
		944	to disk (but NOT the metadata), by calling the Linux-specific
		945	sync_file_range call. If sync_file_range is not available or it returns
		946	ENOSYS, then fdatasync or fsync is being substituted.
		947
		948	C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>,
		949	C<IO::AIO::SYNC_FILE_RANGE_WRITE> and
		950	C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range
		951	manpage for details.
		952
		953	=item aio_pathsync $path, $callback->($status)
		954
		955	This request tries to open, fsync and close the given path. This is a
		956	composite request intended to sync directories after directory operations
		957	(E.g. rename). This might not work on all operating systems or have any
		958	specific effect, but usually it makes sure that directory changes get
		959	written to disc. It works for anything that can be opened for read-only,
		960	not just directories.
		961
		962	Future versions of this function might fall back to other methods when
		963	C<fsync> on the directory fails (such as calling C<sync>).
		964
		965	Passes C<0> when everything went ok, and C<-1> on error.
		966
		967	=cut
		968
		969	sub aio_pathsync($;$) {
		970	my ($path, $cb) = @_;
		971
		972	my $pri = aioreq_pri;
		973	my $grp = aio_group $cb;
		974
		975	aioreq_pri $pri;
		976	add $grp aio_open $path, O_RDONLY, 0, sub {
		977	my ($fh) = @_;
		978	if ($fh) {
		979	aioreq_pri $pri;
		980	add $grp aio_fsync $fh, sub {
		981	$grp->result ($_[0]);
		982
		983	aioreq_pri $pri;
		984	add $grp aio_close $fh;
		985	};
		986	} else {
		987	$grp->result (-1);
		988	}
		989	};
		990
		991	$grp
		992	}
851		993
852	=item aio_group $callback->(...)	994	=item aio_group $callback->(...)
853		995
854	This is a very special aio request: Instead of doing something, it is a	996	This is a very special aio request: Instead of doing something, it is a
855	container for other aio requests, which is useful if you want to bundle	997	container for other aio requests, which is useful if you want to bundle
…		…
905	=item cancel $req	1047	=item cancel $req
906		1048
907	Cancels the request, if possible. Has the effect of skipping execution	1049	Cancels the request, if possible. Has the effect of skipping execution
908	when entering the B<execute> state and skipping calling the callback when	1050	when entering the B<execute> state and skipping calling the callback when
909	entering the the B<result> state, but will leave the request otherwise	1051	entering the the B<result> state, but will leave the request otherwise
910	untouched. That means that requests that currently execute will not be	1052	untouched (with the exception of readdir). That means that requests that
911	stopped and resources held by the request will not be freed prematurely.	1053	currently execute will not be stopped and resources held by the request
		1054	will not be freed prematurely.
912		1055
913	=item cb $req $callback->(...)	1056	=item cb $req $callback->(...)
914		1057
915	Replace (or simply set) the callback registered to the request.	1058	Replace (or simply set) the callback registered to the request.
916		1059
…		…
967	Their lifetime, simplified, looks like this: when they are empty, they	1110	Their lifetime, simplified, looks like this: when they are empty, they
968	will finish very quickly. If they contain only requests that are in the	1111	will finish very quickly. If they contain only requests that are in the
969	C<done> state, they will also finish. Otherwise they will continue to	1112	C<done> state, they will also finish. Otherwise they will continue to
970	exist.	1113	exist.
971		1114
972	That means after creating a group you have some time to add requests. And	1115	That means after creating a group you have some time to add requests
973	in the callbacks of those requests, you can add further requests to the	1116	(precisely before the callback has been invoked, which is only done within
974	group. And only when all those requests have finished will the the group	1117	the C<poll_cb>). And in the callbacks of those requests, you can add
975	itself finish.	1118	further requests to the group. And only when all those requests have
		1119	finished will the the group itself finish.
976		1120
977	=over 4	1121	=over 4
978		1122
979	=item add $grp ...	1123	=item add $grp ...
980		1124
…		…
992	itself. Useful when you queued a lot of events but got a result early.	1136	itself. Useful when you queued a lot of events but got a result early.
993		1137
994	=item $grp->result (...)	1138	=item $grp->result (...)
995		1139
996	Set the result value(s) that will be passed to the group callback when all	1140	Set the result value(s) that will be passed to the group callback when all
997	subrequests have finished and set thre groups errno to the current value	1141	subrequests have finished and set the groups errno to the current value
998	of errno (just like calling C<errno> without an error number). By default,	1142	of errno (just like calling C<errno> without an error number). By default,
999	no argument will be passed and errno is zero.	1143	no argument will be passed and errno is zero.
1000		1144
1001	=item $grp->errno ([$errno])	1145	=item $grp->errno ([$errno])
1002		1146
…		…
1013	=item feed $grp $callback->($grp)	1157	=item feed $grp $callback->($grp)
1014		1158
1015	Sets a feeder/generator on this group: every group can have an attached	1159	Sets a feeder/generator on this group: every group can have an attached
1016	generator that generates requests if idle. The idea behind this is that,	1160	generator that generates requests if idle. The idea behind this is that,
1017	although you could just queue as many requests as you want in a group,	1161	although you could just queue as many requests as you want in a group,
1018	this might starve other requests for a potentially long time. For	1162	this might starve other requests for a potentially long time. For example,
1019	example, C<aio_scandir> might generate hundreds of thousands C<aio_stat>	1163	C<aio_scandir> might generate hundreds of thousands C<aio_stat> requests,
1020	requests, delaying any later requests for a long time.	1164	delaying any later requests for a long time.
1021		1165
1022	To avoid this, and allow incremental generation of requests, you can	1166	To avoid this, and allow incremental generation of requests, you can
1023	instead a group and set a feeder on it that generates those requests. The	1167	instead a group and set a feeder on it that generates those requests. The
1024	feed callback will be called whenever there are few enough (see C<limit>,	1168	feed callback will be called whenever there are few enough (see C<limit>,
1025	below) requests active in the group itself and is expected to queue more	1169	below) requests active in the group itself and is expected to queue more
…		…
1029	not impose any limits).	1173	not impose any limits).
1030		1174
1031	If the feed does not queue more requests when called, it will be	1175	If the feed does not queue more requests when called, it will be
1032	automatically removed from the group.	1176	automatically removed from the group.
1033		1177
1034	If the feed limit is C<0>, it will be set to C<2> automatically.	1178	If the feed limit is C<0> when this method is called, it will be set to
		1179	C<2> automatically.
1035		1180
1036	Example:	1181	Example:
1037		1182
1038	# stat all files in @files, but only ever use four aio requests concurrently:	1183	# stat all files in @files, but only ever use four aio requests concurrently:
1039		1184
…		…
1051	Sets the feeder limit for the group: The feeder will be called whenever	1196	Sets the feeder limit for the group: The feeder will be called whenever
1052	the group contains less than this many requests.	1197	the group contains less than this many requests.
1053		1198
1054	Setting the limit to C<0> will pause the feeding process.	1199	Setting the limit to C<0> will pause the feeding process.
1055		1200
		1201	The default value for the limit is C<0>, but note that setting a feeder
		1202	automatically bumps it up to C<2>.
		1203
1056	=back	1204	=back
1057		1205
1058	=head2 SUPPORT FUNCTIONS	1206	=head2 SUPPORT FUNCTIONS
1059		1207
1060	=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION	1208	=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION
…		…
1062	=over 4	1210	=over 4
1063		1211
1064	=item $fileno = IO::AIO::poll_fileno	1212	=item $fileno = IO::AIO::poll_fileno
1065		1213
1066	Return the I<request result pipe file descriptor>. This filehandle must be	1214	Return the I<request result pipe file descriptor>. This filehandle must be
1067	polled for reading by some mechanism outside this module (e.g. Event or	1215	polled for reading by some mechanism outside this module (e.g. EV, Glib,
1068	select, see below or the SYNOPSIS). If the pipe becomes readable you have	1216	select and so on, see below or the SYNOPSIS). If the pipe becomes readable
1069	to call C<poll_cb> to check the results.	1217	you have to call C<poll_cb> to check the results.
1070		1218
1071	See C<poll_cb> for an example.	1219	See C<poll_cb> for an example.
1072		1220
1073	=item IO::AIO::poll_cb	1221	=item IO::AIO::poll_cb
1074		1222
1075	Process some outstanding events on the result pipe. You have to call this	1223	Process some outstanding events on the result pipe. You have to call this
1076	regularly. Returns the number of events processed. Returns immediately	1224	regularly. Returns C<0> if all events could be processed, or C<-1> if it
		1225	returned earlier for whatever reason. Returns immediately when no events
1077	when no events are outstanding. The amount of events processed depends on	1226	are outstanding. The amount of events processed depends on the settings of
1078	the settings of C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>.	1227	C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>.
1079		1228
1080	If not all requests were processed for whatever reason, the filehandle	1229	If not all requests were processed for whatever reason, the filehandle
1081	will still be ready when C<poll_cb> returns.	1230	will still be ready when C<poll_cb> returns, so normally you don't have to
		1231	do anything special to have it called later.
1082		1232
1083	Example: Install an Event watcher that automatically calls	1233	Example: Install an Event watcher that automatically calls
1084	IO::AIO::poll_cb with high priority:	1234	IO::AIO::poll_cb with high priority (more examples can be found in the
		1235	SYNOPSIS section, at the top of this document):
1085		1236
1086	Event->io (fd => IO::AIO::poll_fileno,	1237	Event->io (fd => IO::AIO::poll_fileno,
1087	poll => 'r', async => 1,	1238	poll => 'r', async => 1,
1088	cb => \&IO::AIO::poll_cb);	1239	cb => \&IO::AIO::poll_cb);
1089		1240
…		…
1200		1351
1201	The default is probably ok in most situations, especially if thread	1352	The default is probably ok in most situations, especially if thread
1202	creation is fast. If thread creation is very slow on your system you might	1353	creation is fast. If thread creation is very slow on your system you might
1203	want to use larger values.	1354	want to use larger values.
1204		1355
1205	=item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs	1356	=item IO::AIO::max_outstanding $maxreqs
1206		1357
1207	This is a very bad function to use in interactive programs because it	1358	This is a very bad function to use in interactive programs because it
1208	blocks, and a bad way to reduce concurrency because it is inexact: Better	1359	blocks, and a bad way to reduce concurrency because it is inexact: Better
1209	use an C<aio_group> together with a feed callback.	1360	use an C<aio_group> together with a feed callback.
1210		1361
…		…
1215		1366
1216	The default value is very large, so there is no practical limit on the	1367	The default value is very large, so there is no practical limit on the
1217	number of outstanding requests.	1368	number of outstanding requests.
1218		1369
1219	You can still queue as many requests as you want. Therefore,	1370	You can still queue as many requests as you want. Therefore,
1220	C<max_oustsanding> is mainly useful in simple scripts (with low values) or	1371	C<max_outstanding> is mainly useful in simple scripts (with low values) or
1221	as a stop gap to shield against fatal memory overflow (with large values).	1372	as a stop gap to shield against fatal memory overflow (with large values).
1222		1373
1223	=back	1374	=back
1224		1375
1225	=head3 STATISTICAL INFORMATION	1376	=head3 STATISTICAL INFORMATION
…		…
1246	Returns the number of requests currently in the pending state (executed,	1397	Returns the number of requests currently in the pending state (executed,
1247	but not yet processed by poll_cb).	1398	but not yet processed by poll_cb).
1248		1399
1249	=back	1400	=back
1250		1401
		1402	=head3 MISCELLANEOUS FUNCTIONS
		1403
		1404	IO::AIO implements some functions that might be useful, but are not
		1405	asynchronous.
		1406
		1407	=over 4
		1408
		1409	=item IO::AIO::sendfile $ofh, $ifh, $offset, $count
		1410
		1411	Calls the C<eio_sendfile_sync> function, which is like C<aio_sendfile>,
		1412	but is blocking (this makes most sense if you know the input data is
		1413	likely cached already and the output filehandle is set to non-blocking
		1414	operations).
		1415
		1416	Returns the number of bytes copied, or C<-1> on error.
		1417
		1418	=item IO::AIO::fadvise $fh, $offset, $len, $advice
		1419
		1420	Simply calls the C<posix_fadvise> function (see it's
		1421	manpage for details). The following advice constants are
		1422	avaiable: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>,
		1423	C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>,
		1424	C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>.
		1425
		1426	On systems that do not implement C<posix_fadvise>, this function returns
		1427	ENOSYS, otherwise the return value of C<posix_fadvise>.
		1428
		1429	=back
		1430
1251	=cut	1431	=cut
1252
1253	# support function to convert a fd into a perl filehandle
1254	sub _fd2fh {
1255	return undef if $_[0] < 0;
1256
1257	# try to generate nice filehandles
1258	my $sym = "IO::AIO::fd#$_[0]";
1259	local *$sym;
1260
1261	open *$sym, "+<&=$_[0]" # usually works under any unix
1262	or open *$sym, "<&=$_[0]" # cygwin needs this
1263	or open *$sym, ">&=$_[0]" # or this
1264	or return undef;
1265
1266	*$sym
1267	}
1268		1432
1269	min_parallel 8;	1433	min_parallel 8;
1270		1434
1271	END { flush }	1435	END { flush }
1272		1436
…		…
1311		1475
1312	Known bugs will be fixed in the next release.	1476	Known bugs will be fixed in the next release.
1313		1477
1314	=head1 SEE ALSO	1478	=head1 SEE ALSO
1315		1479
1316	L<Coro::AIO>.	1480	L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a
		1481	more natural syntax.
1317		1482
1318	=head1 AUTHOR	1483	=head1 AUTHOR
1319		1484
1320	Marc Lehmann <schmorp@schmorp.de>	1485	Marc Lehmann <schmorp@schmorp.de>
1321	http://home.schmorp.de/	1486	http://home.schmorp.de/

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.115 by root, Mon Sep 24 18:14:00 2007 UTC vs. Revision 1.166 by root, Thu Nov 12 00:01:52 2009 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.115 by root, Mon Sep 24 18:14:00 2007 UTC vs.
Revision 1.166 by root, Thu Nov 12 00:01:52 2009 UTC