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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.109 by root, Sun Jun 3 09:44:17 2007 UTC vs.
Revision 1.161 by root, Tue Jul 14 00:32:27 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 = '2.4';	196	our $VERSION = '3.261';
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);	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).
333		346
		347	C<aio_read> will, like C<sysread>, shrink or grow the C<$data> scalar to
		348	offset plus the actual number of bytes read.
		349
334	If C<$offset> is undefined, then the current file offset will be used (and	350	If C<$offset> is undefined, then the current file descriptor offset will
335	updated), otherwise the file offset will not be changed by these calls.	351	be used (and updated), otherwise the file descriptor offset will not be
		352	changed by these calls.
336		353
337	If C<$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<$data>.
338		356
339	If C<$dataoffset> is less than zero, it will be counted from the end of	357	If C<$dataoffset> is less than zero, it will be counted from the end of
340	C<$data>.	358	C<$data>.
341		359
342	The C<$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
…		…
443	aio_chown "path", 0, -1;	461	aio_chown "path", 0, -1;
444	# same as above:	462	# same as above:
445	aio_chown "path", 0, undef;	463	aio_chown "path", 0, undef;
446		464
447		465
		466	=item aio_truncate $fh_or_path, $offset, $callback->($status)
		467
		468	Works like truncate(2) or ftruncate(2).
		469
		470
448	=item aio_chmod $fh_or_path, $mode, $callback->($status)	471	=item aio_chmod $fh_or_path, $mode, $callback->($status)
449		472
450	Works like perl's C<chmod> function.	473	Works like perl's C<chmod> function.
451		474
452		475
…		…
509		532
510	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
511	directory (i.e. opendir + readdir + closedir). The entries will not be	534	directory (i.e. opendir + readdir + closedir). The entries will not be
512	sorted, and will B<NOT> include the C<.> and C<..> entries.	535	sorted, and will B<NOT> include the C<.> and C<..> entries.
513		536
514	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
515	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
516		605
517		606
518	=item aio_load $path, $data, $callback->($status)	607	=item aio_load $path, $data, $callback->($status)
519		608
520	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
521	memory. Status is the same as with aio_read.	610	memory. Status is the same as with aio_read.
522		611
523	=cut	612	=cut
524		613
525	sub aio_load($$;$) {	614	sub aio_load($$;$) {
526	aio_block {
527	my ($path, undef, $cb) = @_;	615	my ($path, undef, $cb) = @_;
528	my $data = \$_[1];	616	my $data = \$_[1];
529		617
530	my $pri = aioreq_pri;	618	my $pri = aioreq_pri;
531	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);
532		625
533	aioreq_pri $pri;	626	aioreq_pri $pri;
534	add $grp aio_open $path, O_RDONLY, 0, sub {
535	my $fh = shift
536	or return $grp->result (-1);
537
538	aioreq_pri $pri;
539	add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub {	627	add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub {
540	$grp->result ($_[0]);	628	$grp->result ($_[0]);
541	};
542	};	629	};
543
544	$grp
545	}	630	};
		631
		632	$grp
546	}	633	}
547		634
548	=item aio_copy $srcpath, $dstpath, $callback->($status)	635	=item aio_copy $srcpath, $dstpath, $callback->($status)
549		636
550	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
551	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
552	the C<0> (error) or C<-1> ok.	639	the C<0> (error) or C<-1> ok.
553		640
554	This is a composite request that it creates the destination file with	641	This is a composite request that creates the destination file with
555	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
556	C<aio_sendfile>, followed by restoring atime, mtime, access mode and	643	C<aio_sendfile>, followed by restoring atime, mtime, access mode and
557	uid/gid, in that order.	644	uid/gid, in that order.
558		645
559	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
…		…
561	errors are being ignored.	648	errors are being ignored.
562		649
563	=cut	650	=cut
564		651
565	sub aio_copy($$;$) {	652	sub aio_copy($$;$) {
566	aio_block {
567	my ($src, $dst, $cb) = @_;	653	my ($src, $dst, $cb) = @_;
568		654
569	my $pri = aioreq_pri;	655	my $pri = aioreq_pri;
570	my $grp = aio_group $cb;	656	my $grp = aio_group $cb;
571		657
572	aioreq_pri $pri;	658	aioreq_pri $pri;
573	add $grp aio_open $src, O_RDONLY, 0, sub {	659	add $grp aio_open $src, O_RDONLY, 0, sub {
574	if (my $src_fh = $_[0]) {	660	if (my $src_fh = $_[0]) {
575	my @stat = stat $src_fh;	661	my @stat = stat $src_fh; # hmm, might bock over nfs?
576		662
577	aioreq_pri $pri;	663	aioreq_pri $pri;
578	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 {
579	if (my $dst_fh = $_[0]) {	665	if (my $dst_fh = $_[0]) {
580	aioreq_pri $pri;	666	aioreq_pri $pri;
581	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {	667	add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
582	if ($_[0] == $stat[7]) {	668	if ($_[0] == $stat[7]) {
583	$grp->result (0);	669	$grp->result (0);
584	close $src_fh;	670	close $src_fh;
585		671
586	# those should not normally block. should. should.
587	utime $stat[8], $stat[9], $dst;
588	chmod $stat[2] & 07777, $dst_fh;
589	chown $stat[4], $stat[5], $dst_fh;
590	close $dst_fh;
591	} else {	672	my $ch = sub {
592	$grp->result (-1);
593	close $src_fh;
594	close $dst_fh;
595
596	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;
597	add $grp aio_unlink $dst;	678	add $grp aio_close $dst_fh;
		679	}
		680	};
598	}	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;
599	};	699	}
600	} else {
601	$grp->result (-1);
602	}	700	};
		701	} else {
		702	$grp->result (-1);
603	},	703	}
604
605	} else {
606	$grp->result (-1);
607	}	704	},
		705
		706	} else {
		707	$grp->result (-1);
608	};	708	}
609
610	$grp
611	}	709	};
		710
		711	$grp
612	}	712	}
613		713
614	=item aio_move $srcpath, $dstpath, $callback->($status)	714	=item aio_move $srcpath, $dstpath, $callback->($status)
615		715
616	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
617	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
618	the C<0> (error) or C<-1> ok.	718	the C<0> (error) or C<-1> ok.
619		719
620	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
621	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
622	that is successful, unlinking the C<$srcpath>.	722	that is successful, unlinks the C<$srcpath>.
623		723
624	=cut	724	=cut
625		725
626	sub aio_move($$;$) {	726	sub aio_move($$;$) {
627	aio_block {
628	my ($src, $dst, $cb) = @_;	727	my ($src, $dst, $cb) = @_;
629		728
630	my $pri = aioreq_pri;	729	my $pri = aioreq_pri;
631	my $grp = aio_group $cb;	730	my $grp = aio_group $cb;
632		731
633	aioreq_pri $pri;	732	aioreq_pri $pri;
634	add $grp aio_rename $src, $dst, sub {	733	add $grp aio_rename $src, $dst, sub {
635	if ($_[0] && $! == EXDEV) {	734	if ($_[0] && $! == EXDEV) {
636	aioreq_pri $pri;	735	aioreq_pri $pri;
637	add $grp aio_copy $src, $dst, sub {	736	add $grp aio_copy $src, $dst, sub {
638	$grp->result ($_[0]);
639
640	if (!$_[0]) {
641	aioreq_pri $pri;
642	add $grp aio_unlink $src;
643	}
644	};
645	} else {
646	$grp->result ($_[0]);	737	$grp->result ($_[0]);
		738
		739	if (!$_[0]) {
		740	aioreq_pri $pri;
		741	add $grp aio_unlink $src;
		742	}
647	}	743	};
		744	} else {
		745	$grp->result ($_[0]);
648	};	746	}
649
650	$grp
651	}	747	};
		748
		749	$grp
652	}	750	}
653		751
654	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)	752	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
655		753
656	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
…		…
676		774
677	Implementation notes.	775	Implementation notes.
678		776
679	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.
680		778
		779	If readdir returns file type information, then this is used directly to
		780	find directories.
		781
681	After reading the directory, the modification time, size etc. of the	782	Otherwise, after reading the directory, the modification time, size etc.
682	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
683	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
684	entries are directories (if >= 2). Otherwise, no knowledge of the number	785	how many entries are directories (if >= 2). Otherwise, no knowledge of the
685	of subdirectories will be assumed.	786	number of subdirectories will be assumed.
686		787
687	Then entries will be sorted into likely directories (everything without	788	Then entries will be sorted into likely directories a non-initial dot
688	a non-initial dot currently) and likely non-directories (everything	789	currently) and likely non-directories (see C<aio_readdirx>). Then every
689	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,
690	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
691	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
692	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
693	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
694	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.
695		797
696	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
697	rest of the entries is assumed to be non-directories.	799	rest of the entries is assumed to be non-directories.
698		800
699	This only works with certainty on POSIX (= UNIX) filesystems, which	801	This only works with certainty on POSIX (= UNIX) filesystems, which
…		…
704	directory counting heuristic.	806	directory counting heuristic.
705		807
706	=cut	808	=cut
707		809
708	sub aio_scandir($$;$) {	810	sub aio_scandir($$;$) {
709	aio_block {
710	my ($path, $maxreq, $cb) = @_;	811	my ($path, $maxreq, $cb) = @_;
711		812
712	my $pri = aioreq_pri;	813	my $pri = aioreq_pri;
713		814
714	my $grp = aio_group $cb;	815	my $grp = aio_group $cb;
715		816
716	$maxreq = 4 if $maxreq <= 0;	817	$maxreq = 4 if $maxreq <= 0;
717		818
718	# 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
719	aioreq_pri $pri;	827	aioreq_pri $pri;
720	add $grp aio_stat $path, sub {	828	add $grp aio_readdirx $path, READDIR_DIRS_FIRST, sub {
		829	my $entries = shift
721	return $grp->result () if $_[0];	830	or return $grp->result ();
722	my $now = time;
723	my $hash1 = join ":", (stat _)[0,1,3,7,9];
724		831
725	# read the directory entries	832	# stat the dir another time
726	aioreq_pri $pri;	833	aioreq_pri $pri;
727	add $grp aio_readdir $path, sub {
728	my $entries = shift
729	or return $grp->result ();
730
731	# stat the dir another time
732	aioreq_pri $pri;
733	add $grp aio_stat $path, sub {	834	add $grp aio_stat $path, sub {
734	my $hash2 = join ":", (stat _)[0,1,3,7,9];	835	my $hash2 = join ":", (stat _)[0,1,3,7,9];
735		836
736	my $ndirs;	837	my $ndirs;
737		838
738	# take the slow route if anything looks fishy	839	# take the slow route if anything looks fishy
739	if ($hash1 ne $hash2 or (stat _)[9] == $now) {	840	if ($hash1 ne $hash2 or (stat _)[9] == $now) {
740	$ndirs = -1;	841	$ndirs = -1;
741	} else {	842	} else {
742	# if nlink == 2, we are finished	843	# if nlink == 2, we are finished
743	# on non-posix-fs's, we rely on nlink < 2	844	# for non-posix-fs's, we rely on nlink < 2
744	$ndirs = (stat _)[3] - 2	845	$ndirs = (stat _)[3] - 2
745	or return $grp->result ([], $entries);	846	or return $grp->result ([], $entries);
746	}	847	}
747		848
748	# sort into likely dirs and likely nondirs
749	# dirs == files without ".", short entries first
750	$entries = [map $_->[0],
751	sort { $b->[1] cmp $a->[1] }
752	map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
753	@$entries];
754
755	my (@dirs, @nondirs);	849	my (@dirs, @nondirs);
756		850
757	my $statgrp = add $grp aio_group sub {	851	my $statgrp = add $grp aio_group sub {
758	$grp->result (\@dirs, \@nondirs);	852	$grp->result (\@dirs, \@nondirs);
759	};	853	};
760		854
761	limit $statgrp $maxreq;	855	limit $statgrp $maxreq;
762	feed $statgrp sub {	856	feed $statgrp sub {
763	return unless @$entries;	857	return unless @$entries;
764	my $entry = pop @$entries;	858	my $entry = shift @$entries;
765		859
766	aioreq_pri $pri;	860	aioreq_pri $pri;
767	add $statgrp aio_stat "$path/$entry/.", sub {	861	add $statgrp aio_stat "$path/$entry/.", sub {
768	if ($_[0] < 0) {	862	if ($_[0] < 0) {
769	push @nondirs, $entry;	863	push @nondirs, $entry;
770	} else {	864	} else {
771	# need to check for real directory	865	# need to check for real directory
772	aioreq_pri $pri;	866	aioreq_pri $pri;
773	add $statgrp aio_lstat "$path/$entry", sub {	867	add $statgrp aio_lstat "$path/$entry", sub {
774	if (-d _) {	868	if (-d _) {
775	push @dirs, $entry;	869	push @dirs, $entry;
776		870
777	unless (--$ndirs) {	871	unless (--$ndirs) {
778	push @nondirs, @$entries;	872	push @nondirs, @$entries;
779	feed $statgrp;	873	feed $statgrp;
780	}
781	} else {
782	push @nondirs, $entry;
783	}	874	}
		875	} else {
		876	push @nondirs, $entry;
784	}	877	}
785	}	878	}
786	};	879	}
787	};	880	};
788	};	881	};
789	};	882	};
790	};	883	};
791
792	$grp
793	}	884	};
		885
		886	$grp
794	}	887	}
795		888
796	=item aio_rmtree $path, $callback->($status)	889	=item aio_rmtree $path, $callback->($status)
797		890
798	Delete a directory tree starting (and including) C<$path>, return the	891	Delete a directory tree starting (and including) C<$path>, return the
…		…
802		895
803	=cut	896	=cut
804		897
805	sub aio_rmtree;	898	sub aio_rmtree;
806	sub aio_rmtree($;$) {	899	sub aio_rmtree($;$) {
807	aio_block {
808	my ($path, $cb) = @_;	900	my ($path, $cb) = @_;
809		901
810	my $pri = aioreq_pri;	902	my $pri = aioreq_pri;
811	my $grp = aio_group $cb;	903	my $grp = aio_group $cb;
812		904
813	aioreq_pri $pri;	905	aioreq_pri $pri;
814	add $grp aio_scandir $path, 0, sub {	906	add $grp aio_scandir $path, 0, sub {
815	my ($dirs, $nondirs) = @_;	907	my ($dirs, $nondirs) = @_;
816		908
817	my $dirgrp = aio_group sub {	909	my $dirgrp = aio_group sub {
818	add $grp aio_rmdir $path, sub {	910	add $grp aio_rmdir $path, sub {
819	$grp->result ($_[0]);	911	$grp->result ($_[0]);
820	};
821	};	912	};
822
823	(aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs;
824	(aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs;
825
826	add $grp $dirgrp;
827	};	913	};
828		914
829	$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;
830	}	919	};
		920
		921	$grp
831	}	922	}
		923
		924	=item aio_sync $callback->($status)
		925
		926	Asynchronously call sync and call the callback when finished.
832		927
833	=item aio_fsync $fh, $callback->($status)	928	=item aio_fsync $fh, $callback->($status)
834		929
835	Asynchronously call fsync on the given filehandle and call the callback	930	Asynchronously call fsync on the given filehandle and call the callback
836	with the fsync result code.	931	with the fsync result code.
…		…
840	Asynchronously call fdatasync on the given filehandle and call the	935	Asynchronously call fdatasync on the given filehandle and call the
841	callback with the fdatasync result code.	936	callback with the fdatasync result code.
842		937
843	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
844	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	Passes C<0> when everything went ok, and C<-1> on error.
		963
		964	=cut
		965
		966	sub aio_pathsync($;$) {
		967	my ($path, $cb) = @_;
		968
		969	my $pri = aioreq_pri;
		970	my $grp = aio_group $cb;
		971
		972	aioreq_pri $pri;
		973	add $grp aio_open $path, O_RDONLY, 0, sub {
		974	my ($fh) = @_;
		975	if ($fh) {
		976	aioreq_pri $pri;
		977	add $grp aio_fsync $fh, sub {
		978	$grp->result ($_[0]);
		979
		980	aioreq_pri $pri;
		981	add $grp aio_close $fh;
		982	};
		983	} else {
		984	$grp->result (-1);
		985	}
		986	};
		987
		988	$grp
		989	}
845		990
846	=item aio_group $callback->(...)	991	=item aio_group $callback->(...)
847		992
848	This is a very special aio request: Instead of doing something, it is a	993	This is a very special aio request: Instead of doing something, it is a
849	container for other aio requests, which is useful if you want to bundle	994	container for other aio requests, which is useful if you want to bundle
…		…
899	=item cancel $req	1044	=item cancel $req
900		1045
901	Cancels the request, if possible. Has the effect of skipping execution	1046	Cancels the request, if possible. Has the effect of skipping execution
902	when entering the B<execute> state and skipping calling the callback when	1047	when entering the B<execute> state and skipping calling the callback when
903	entering the the B<result> state, but will leave the request otherwise	1048	entering the the B<result> state, but will leave the request otherwise
904	untouched. That means that requests that currently execute will not be	1049	untouched (with the exception of readdir). That means that requests that
905	stopped and resources held by the request will not be freed prematurely.	1050	currently execute will not be stopped and resources held by the request
		1051	will not be freed prematurely.
906		1052
907	=item cb $req $callback->(...)	1053	=item cb $req $callback->(...)
908		1054
909	Replace (or simply set) the callback registered to the request.	1055	Replace (or simply set) the callback registered to the request.
910		1056
…		…
961	Their lifetime, simplified, looks like this: when they are empty, they	1107	Their lifetime, simplified, looks like this: when they are empty, they
962	will finish very quickly. If they contain only requests that are in the	1108	will finish very quickly. If they contain only requests that are in the
963	C<done> state, they will also finish. Otherwise they will continue to	1109	C<done> state, they will also finish. Otherwise they will continue to
964	exist.	1110	exist.
965		1111
966	That means after creating a group you have some time to add requests. And	1112	That means after creating a group you have some time to add requests
967	in the callbacks of those requests, you can add further requests to the	1113	(precisely before the callback has been invoked, which is only done within
968	group. And only when all those requests have finished will the the group	1114	the C<poll_cb>). And in the callbacks of those requests, you can add
969	itself finish.	1115	further requests to the group. And only when all those requests have
		1116	finished will the the group itself finish.
970		1117
971	=over 4	1118	=over 4
972		1119
973	=item add $grp ...	1120	=item add $grp ...
974		1121
…		…
986	itself. Useful when you queued a lot of events but got a result early.	1133	itself. Useful when you queued a lot of events but got a result early.
987		1134
988	=item $grp->result (...)	1135	=item $grp->result (...)
989		1136
990	Set the result value(s) that will be passed to the group callback when all	1137	Set the result value(s) that will be passed to the group callback when all
991	subrequests have finished and set thre groups errno to the current value	1138	subrequests have finished and set the groups errno to the current value
992	of errno (just like calling C<errno> without an error number). By default,	1139	of errno (just like calling C<errno> without an error number). By default,
993	no argument will be passed and errno is zero.	1140	no argument will be passed and errno is zero.
994		1141
995	=item $grp->errno ([$errno])	1142	=item $grp->errno ([$errno])
996		1143
…		…
1007	=item feed $grp $callback->($grp)	1154	=item feed $grp $callback->($grp)
1008		1155
1009	Sets a feeder/generator on this group: every group can have an attached	1156	Sets a feeder/generator on this group: every group can have an attached
1010	generator that generates requests if idle. The idea behind this is that,	1157	generator that generates requests if idle. The idea behind this is that,
1011	although you could just queue as many requests as you want in a group,	1158	although you could just queue as many requests as you want in a group,
1012	this might starve other requests for a potentially long time. For	1159	this might starve other requests for a potentially long time. For example,
1013	example, C<aio_scandir> might generate hundreds of thousands C<aio_stat>	1160	C<aio_scandir> might generate hundreds of thousands C<aio_stat> requests,
1014	requests, delaying any later requests for a long time.	1161	delaying any later requests for a long time.
1015		1162
1016	To avoid this, and allow incremental generation of requests, you can	1163	To avoid this, and allow incremental generation of requests, you can
1017	instead a group and set a feeder on it that generates those requests. The	1164	instead a group and set a feeder on it that generates those requests. The
1018	feed callback will be called whenever there are few enough (see C<limit>,	1165	feed callback will be called whenever there are few enough (see C<limit>,
1019	below) requests active in the group itself and is expected to queue more	1166	below) requests active in the group itself and is expected to queue more
…		…
1023	not impose any limits).	1170	not impose any limits).
1024		1171
1025	If the feed does not queue more requests when called, it will be	1172	If the feed does not queue more requests when called, it will be
1026	automatically removed from the group.	1173	automatically removed from the group.
1027		1174
1028	If the feed limit is C<0>, it will be set to C<2> automatically.	1175	If the feed limit is C<0> when this method is called, it will be set to
		1176	C<2> automatically.
1029		1177
1030	Example:	1178	Example:
1031		1179
1032	# stat all files in @files, but only ever use four aio requests concurrently:	1180	# stat all files in @files, but only ever use four aio requests concurrently:
1033		1181
…		…
1045	Sets the feeder limit for the group: The feeder will be called whenever	1193	Sets the feeder limit for the group: The feeder will be called whenever
1046	the group contains less than this many requests.	1194	the group contains less than this many requests.
1047		1195
1048	Setting the limit to C<0> will pause the feeding process.	1196	Setting the limit to C<0> will pause the feeding process.
1049		1197
		1198	The default value for the limit is C<0>, but note that setting a feeder
		1199	automatically bumps it up to C<2>.
		1200
1050	=back	1201	=back
1051		1202
1052	=head2 SUPPORT FUNCTIONS	1203	=head2 SUPPORT FUNCTIONS
1053		1204
1054	=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION	1205	=head3 EVENT PROCESSING AND EVENT LOOP INTEGRATION
…		…
1056	=over 4	1207	=over 4
1057		1208
1058	=item $fileno = IO::AIO::poll_fileno	1209	=item $fileno = IO::AIO::poll_fileno
1059		1210
1060	Return the I<request result pipe file descriptor>. This filehandle must be	1211	Return the I<request result pipe file descriptor>. This filehandle must be
1061	polled for reading by some mechanism outside this module (e.g. Event or	1212	polled for reading by some mechanism outside this module (e.g. EV, Glib,
1062	select, see below or the SYNOPSIS). If the pipe becomes readable you have	1213	select and so on, see below or the SYNOPSIS). If the pipe becomes readable
1063	to call C<poll_cb> to check the results.	1214	you have to call C<poll_cb> to check the results.
1064		1215
1065	See C<poll_cb> for an example.	1216	See C<poll_cb> for an example.
1066		1217
1067	=item IO::AIO::poll_cb	1218	=item IO::AIO::poll_cb
1068		1219
1069	Process some outstanding events on the result pipe. You have to call this	1220	Process some outstanding events on the result pipe. You have to call this
1070	regularly. Returns the number of events processed. Returns immediately	1221	regularly. Returns C<0> if all events could be processed, or C<-1> if it
		1222	returned earlier for whatever reason. Returns immediately when no events
1071	when no events are outstanding. The amount of events processed depends on	1223	are outstanding. The amount of events processed depends on the settings of
1072	the settings of C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>.	1224	C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>.
1073		1225
1074	If not all requests were processed for whatever reason, the filehandle	1226	If not all requests were processed for whatever reason, the filehandle
1075	will still be ready when C<poll_cb> returns.	1227	will still be ready when C<poll_cb> returns, so normally you don't have to
		1228	do anything special to have it called later.
1076		1229
1077	Example: Install an Event watcher that automatically calls	1230	Example: Install an Event watcher that automatically calls
1078	IO::AIO::poll_cb with high priority:	1231	IO::AIO::poll_cb with high priority (more examples can be found in the
		1232	SYNOPSIS section, at the top of this document):
1079		1233
1080	Event->io (fd => IO::AIO::poll_fileno,	1234	Event->io (fd => IO::AIO::poll_fileno,
1081	poll => 'r', async => 1,	1235	poll => 'r', async => 1,
1082	cb => \&IO::AIO::poll_cb);	1236	cb => \&IO::AIO::poll_cb);
1083		1237
…		…
1194		1348
1195	The default is probably ok in most situations, especially if thread	1349	The default is probably ok in most situations, especially if thread
1196	creation is fast. If thread creation is very slow on your system you might	1350	creation is fast. If thread creation is very slow on your system you might
1197	want to use larger values.	1351	want to use larger values.
1198		1352
1199	=item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs	1353	=item IO::AIO::max_outstanding $maxreqs
1200		1354
1201	This is a very bad function to use in interactive programs because it	1355	This is a very bad function to use in interactive programs because it
1202	blocks, and a bad way to reduce concurrency because it is inexact: Better	1356	blocks, and a bad way to reduce concurrency because it is inexact: Better
1203	use an C<aio_group> together with a feed callback.	1357	use an C<aio_group> together with a feed callback.
1204		1358
1205	Sets the maximum number of outstanding requests to C<$nreqs>. If you	1359	Sets the maximum number of outstanding requests to C<$nreqs>. If you
1206	to queue up more than this number of requests, the next call to the	1360	do queue up more than this number of requests, the next call to the
1207	C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>)	1361	C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>)
1208	function will block until the limit is no longer exceeded.	1362	function will block until the limit is no longer exceeded.
1209		1363
1210	The default value is very large, so there is no practical limit on the	1364	The default value is very large, so there is no practical limit on the
1211	number of outstanding requests.	1365	number of outstanding requests.
1212		1366
1213	You can still queue as many requests as you want. Therefore,	1367	You can still queue as many requests as you want. Therefore,
1214	C<max_oustsanding> is mainly useful in simple scripts (with low values) or	1368	C<max_outstanding> is mainly useful in simple scripts (with low values) or
1215	as a stop gap to shield against fatal memory overflow (with large values).	1369	as a stop gap to shield against fatal memory overflow (with large values).
1216		1370
1217	=back	1371	=back
1218		1372
1219	=head3 STATISTICAL INFORMATION	1373	=head3 STATISTICAL INFORMATION
…		…
1240	Returns the number of requests currently in the pending state (executed,	1394	Returns the number of requests currently in the pending state (executed,
1241	but not yet processed by poll_cb).	1395	but not yet processed by poll_cb).
1242		1396
1243	=back	1397	=back
1244		1398
		1399	=head3 MISCELLANEOUS FUNCTIONS
		1400
		1401	IO::AIO implements some functions that might be useful, but are not
		1402	asynchronous.
		1403
		1404	=over 4
		1405
		1406	=item IO::AIO::sendfile $ofh, $ifh, $offset, $count
		1407
		1408	Calls the C<eio_sendfile_sync> function, which is like C<aio_sendfile>,
		1409	but is blocking (this makes most sense if you know the input data is
		1410	likely cached already and the output filehandle is set to non-blocking
		1411	operations).
		1412
		1413	Returns the number of bytes copied, or C<-1> on error.
		1414
		1415	=item IO::AIO::fadvise $fh, $offset, $len, $advice
		1416
		1417	Simply calls the C<posix_fadvise> function (see it's
		1418	manpage for details). The following advice constants are
		1419	avaiable: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>,
		1420	C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>,
		1421	C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>.
		1422
		1423	On systems that do not implement C<posix_fadvise>, this function returns
		1424	ENOSYS, otherwise the return value of C<posix_fadvise>.
		1425
		1426	=back
		1427
1245	=cut	1428	=cut
1246
1247	# support function to convert a fd into a perl filehandle
1248	sub _fd2fh {
1249	return undef if $_[0] < 0;
1250
1251	# try to generate nice filehandles
1252	my $sym = "IO::AIO::fd#$_[0]";
1253	local *$sym;
1254
1255	open *$sym, "+<&=$_[0]" # usually works under any unix
1256	or open *$sym, "<&=$_[0]" # cygwin needs this
1257	or open *$sym, ">&=$_[0]" # or this
1258	or return undef;
1259
1260	*$sym
1261	}
1262		1429
1263	min_parallel 8;	1430	min_parallel 8;
1264		1431
1265	END { flush }	1432	END { flush }
1266		1433
…		…
1290	bytes of memory. In addition, stat requests need a stat buffer (possibly	1457	bytes of memory. In addition, stat requests need a stat buffer (possibly
1291	a few hundred bytes), readdir requires a result buffer and so on. Perl	1458	a few hundred bytes), readdir requires a result buffer and so on. Perl
1292	scalars and other data passed into aio requests will also be locked and	1459	scalars and other data passed into aio requests will also be locked and
1293	will consume memory till the request has entered the done state.	1460	will consume memory till the request has entered the done state.
1294		1461
1295	This is now awfully much, so queuing lots of requests is not usually a	1462	This is not awfully much, so queuing lots of requests is not usually a
1296	problem.	1463	problem.
1297		1464
1298	Per-thread usage:	1465	Per-thread usage:
1299		1466
1300	In the execution phase, some aio requests require more memory for	1467	In the execution phase, some aio requests require more memory for
…		…
1305		1472
1306	Known bugs will be fixed in the next release.	1473	Known bugs will be fixed in the next release.
1307		1474
1308	=head1 SEE ALSO	1475	=head1 SEE ALSO
1309		1476
1310	L<Coro::AIO>.	1477	L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a
		1478	more natural syntax.
1311		1479
1312	=head1 AUTHOR	1480	=head1 AUTHOR
1313		1481
1314	Marc Lehmann <schmorp@schmorp.de>	1482	Marc Lehmann <schmorp@schmorp.de>
1315	http://home.schmorp.de/	1483	http://home.schmorp.de/

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.109 by root, Sun Jun 3 09:44:17 2007 UTC vs. Revision 1.161 by root, Tue Jul 14 00:32:27 2009 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.109 by root, Sun Jun 3 09:44:17 2007 UTC vs.
Revision 1.161 by root, Tue Jul 14 00:32:27 2009 UTC