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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.206 by root, Sun Jul 24 03:32:51 2011 UTC vs.
Revision 1.267 by root, Tue Aug 9 11:39:17 2016 UTC

…		…
1	=head1 NAME	1	=head1 NAME
2		2
3	IO::AIO - Asynchronous Input/Output	3	IO::AIO - Asynchronous/Advanced Input/Output
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
7	use IO::AIO;	7	use IO::AIO;
8		8
58	not well-supported or restricted (GNU/Linux doesn't allow them on normal	58	not well-supported or restricted (GNU/Linux doesn't allow them on normal
59	files currently, for example), and they would only support aio_read and	59	files currently, for example), and they would only support aio_read and
60	aio_write, so the remaining functionality would have to be implemented	60	aio_write, so the remaining functionality would have to be implemented
61	using threads anyway.	61	using threads anyway.
62		62
		63	In addition to asynchronous I/O, this module also exports some rather
		64	arcane interfaces, such as C<madvise> or linux's C<splice> system call,
		65	which is why the C<A> in C<AIO> can also mean I<advanced>.
		66
63	Although the module will work in the presence of other (Perl-) threads,	67	Although the module will work in the presence of other (Perl-) threads,
64	it is currently not reentrant in any way, so use appropriate locking	68	it is currently not reentrant in any way, so use appropriate locking
65	yourself, always call C<poll_cb> from within the same thread, or never	69	yourself, always call C<poll_cb> from within the same thread, or never
66	call C<poll_cb> (or other C<aio_> functions) recursively.	70	call C<poll_cb> (or other C<aio_> functions) recursively.
67		71
68	=head2 EXAMPLE	72	=head2 EXAMPLE
69		73
70	This is a simple example that uses the EV module and loads	74	This is a simple example that uses the EV module and loads
71	F</etc/passwd> asynchronously:	75	F</etc/passwd> asynchronously:
72		76
73	use Fcntl;
74	use EV;	77	use EV;
75	use IO::AIO;	78	use IO::AIO;
76		79
77	# register the IO::AIO callback with EV	80	# register the IO::AIO callback with EV
78	my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb;	81	my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb;
…		…
95		98
96	# file contents now in $contents	99	# file contents now in $contents
97	print $contents;	100	print $contents;
98		101
99	# exit event loop and program	102	# exit event loop and program
100	EV::unloop;	103	EV::break;
101	};	104	};
102	};	105	};
103		106
104	# possibly queue up other requests, or open GUI windows,	107	# possibly queue up other requests, or open GUI windows,
105	# check for sockets etc. etc.	108	# check for sockets etc. etc.
106		109
107	# process events as long as there are some:	110	# process events as long as there are some:
108	EV::loop;	111	EV::run;
109		112
110	=head1 REQUEST ANATOMY AND LIFETIME	113	=head1 REQUEST ANATOMY AND LIFETIME
111		114
112	Every C<aio_*> function creates a request. which is a C data structure not	115	Every C<aio_*> function creates a request. which is a C data structure not
113	directly visible to Perl.	116	directly visible to Perl.
…		…
168	use common::sense;	171	use common::sense;
169		172
170	use base 'Exporter';	173	use base 'Exporter';
171		174
172	BEGIN {	175	BEGIN {
173	our $VERSION = '4.0';	176	our $VERSION = 4.34;
174		177
175	our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close	178	our @AIO_REQ = qw(aio_sendfile aio_seek aio_read aio_write aio_open aio_close
176	aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx	179	aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx
177	aio_scandir aio_symlink aio_readlink aio_realpath aio_sync	180	aio_scandir aio_symlink aio_readlink aio_realpath aio_fcntl aio_ioctl
178	aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range aio_fallocate	181	aio_sync aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range
179	aio_pathsync aio_readahead	182	aio_pathsync aio_readahead aio_fiemap aio_allocate
180	aio_rename aio_link aio_move aio_copy aio_group	183	aio_rename aio_link aio_move aio_copy aio_group
181	aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown	184	aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown
182	aio_chmod aio_utime aio_truncate	185	aio_chmod aio_utime aio_truncate
183	aio_msync aio_mtouch aio_mlock aio_mlockall	186	aio_msync aio_mtouch aio_mlock aio_mlockall
184	aio_statvfs);	187	aio_statvfs
		188	aio_wd);
185		189
186	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));	190	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));
187	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush	191	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
188	min_parallel max_parallel max_idle idle_timeout	192	min_parallel max_parallel max_idle idle_timeout
189	nreqs nready npending nthreads	193	nreqs nready npending nthreads
…		…
201		205
202	=head1 FUNCTIONS	206	=head1 FUNCTIONS
203		207
204	=head2 QUICK OVERVIEW	208	=head2 QUICK OVERVIEW
205		209
206	This section simply lists the prototypes of the most important functions	210	This section simply lists the prototypes most of the functions for
207	for quick reference. See the following sections for function-by-function	211	quick reference. See the following sections for function-by-function
208	documentation.	212	documentation.
209		213
		214	aio_wd $pathname, $callback->($wd)
210	aio_open $pathname, $flags, $mode, $callback->($fh)	215	aio_open $pathname, $flags, $mode, $callback->($fh)
211	aio_close $fh, $callback->($status)	216	aio_close $fh, $callback->($status)
		217	aio_seek $fh,$offset,$whence, $callback->($offs)
212	aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)	218	aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
213	aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)	219	aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
214	aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)	220	aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)
215	aio_readahead $fh,$offset,$length, $callback->($retval)	221	aio_readahead $fh,$offset,$length, $callback->($retval)
216	aio_stat $fh_or_path, $callback->($status)	222	aio_stat $fh_or_path, $callback->($status)
217	aio_lstat $fh, $callback->($status)	223	aio_lstat $fh, $callback->($status)
218	aio_statvfs $fh_or_path, $callback->($statvfs)	224	aio_statvfs $fh_or_path, $callback->($statvfs)
219	aio_utime $fh_or_path, $atime, $mtime, $callback->($status)	225	aio_utime $fh_or_path, $atime, $mtime, $callback->($status)
220	aio_chown $fh_or_path, $uid, $gid, $callback->($status)	226	aio_chown $fh_or_path, $uid, $gid, $callback->($status)
		227	aio_chmod $fh_or_path, $mode, $callback->($status)
221	aio_truncate $fh_or_path, $offset, $callback->($status)	228	aio_truncate $fh_or_path, $offset, $callback->($status)
222	aio_chmod $fh_or_path, $mode, $callback->($status)	229	aio_allocate $fh, $mode, $offset, $len, $callback->($status)
		230	aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents)
223	aio_unlink $pathname, $callback->($status)	231	aio_unlink $pathname, $callback->($status)
224	aio_mknod $path, $mode, $dev, $callback->($status)	232	aio_mknod $pathname, $mode, $dev, $callback->($status)
225	aio_link $srcpath, $dstpath, $callback->($status)	233	aio_link $srcpath, $dstpath, $callback->($status)
226	aio_symlink $srcpath, $dstpath, $callback->($status)	234	aio_symlink $srcpath, $dstpath, $callback->($status)
227	aio_readlink $path, $callback->($link)	235	aio_readlink $pathname, $callback->($link)
228	aio_realpath $path, $callback->($link)	236	aio_realpath $pathname, $callback->($path)
229	aio_rename $srcpath, $dstpath, $callback->($status)	237	aio_rename $srcpath, $dstpath, $callback->($status)
230	aio_mkdir $pathname, $mode, $callback->($status)	238	aio_mkdir $pathname, $mode, $callback->($status)
231	aio_rmdir $pathname, $callback->($status)	239	aio_rmdir $pathname, $callback->($status)
232	aio_readdir $pathname, $callback->($entries)	240	aio_readdir $pathname, $callback->($entries)
233	aio_readdirx $pathname, $flags, $callback->($entries, $flags)	241	aio_readdirx $pathname, $flags, $callback->($entries, $flags)
234	IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST	242	IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST
235	IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN	243	IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN
		244	aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs)
236	aio_load $path, $data, $callback->($status)	245	aio_load $pathname, $data, $callback->($status)
237	aio_copy $srcpath, $dstpath, $callback->($status)	246	aio_copy $srcpath, $dstpath, $callback->($status)
238	aio_move $srcpath, $dstpath, $callback->($status)	247	aio_move $srcpath, $dstpath, $callback->($status)
239	aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
240	aio_rmtree $path, $callback->($status)	248	aio_rmtree $pathname, $callback->($status)
		249	aio_fcntl $fh, $cmd, $arg, $callback->($status)
		250	aio_ioctl $fh, $request, $buf, $callback->($status)
241	aio_sync $callback->($status)	251	aio_sync $callback->($status)
242	aio_syncfs $fh, $callback->($status)	252	aio_syncfs $fh, $callback->($status)
243	aio_fsync $fh, $callback->($status)	253	aio_fsync $fh, $callback->($status)
244	aio_fdatasync $fh, $callback->($status)	254	aio_fdatasync $fh, $callback->($status)
245	aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status)	255	aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status)
246	aio_pathsync $path, $callback->($status)	256	aio_pathsync $pathname, $callback->($status)
247	aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status)	257	aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status)
248	aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status)	258	aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status)
249	aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status)	259	aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status)
250	aio_mlockall $flags, $callback->($status)	260	aio_mlockall $flags, $callback->($status)
251	aio_group $callback->(...)	261	aio_group $callback->(...)
…		…
269	IO::AIO::nready	279	IO::AIO::nready
270	IO::AIO::npending	280	IO::AIO::npending
271		281
272	IO::AIO::sendfile $ofh, $ifh, $offset, $count	282	IO::AIO::sendfile $ofh, $ifh, $offset, $count
273	IO::AIO::fadvise $fh, $offset, $len, $advice	283	IO::AIO::fadvise $fh, $offset, $len, $advice
		284	IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]]
		285	IO::AIO::munmap $scalar
274	IO::AIO::madvise $scalar, $offset, $length, $advice	286	IO::AIO::madvise $scalar, $offset, $length, $advice
275	IO::AIO::mprotect $scalar, $offset, $length, $protect	287	IO::AIO::mprotect $scalar, $offset, $length, $protect
276	IO::AIO::munlock $scalar, $offset = 0, $length = undef	288	IO::AIO::munlock $scalar, $offset = 0, $length = undef
277	IO::AIO::munlockall	289	IO::AIO::munlockall
278		290
279	=head2 AIO REQUEST FUNCTIONS	291	=head2 API NOTES
280		292
281	All the C<aio_*> calls are more or less thin wrappers around the syscall	293	All the C<aio_*> calls are more or less thin wrappers around the syscall
282	with the same name (sans C<aio_>). The arguments are similar or identical,	294	with the same name (sans C<aio_>). The arguments are similar or identical,
283	and they all accept an additional (and optional) C<$callback> argument	295	and they all accept an additional (and optional) C<$callback> argument
284	which must be a code reference. This code reference will get called with	296	which must be a code reference. This code reference will be called after
285	the syscall return code (e.g. most syscalls return C<-1> on error, unlike	297	the syscall has been executed in an asynchronous fashion. The results
286	perl, which usually delivers "false") as its sole argument after the given	298	of the request will be passed as arguments to the callback (and, if an
287	syscall has been executed asynchronously.	299	error occured, in C<$!>) - for most requests the syscall return code (e.g.
		300	most syscalls return C<-1> on error, unlike perl, which usually delivers
		301	"false").
		302
		303	Some requests (such as C<aio_readdir>) pass the actual results and
		304	communicate failures by passing C<undef>.
288		305
289	All functions expecting a filehandle keep a copy of the filehandle	306	All functions expecting a filehandle keep a copy of the filehandle
290	internally until the request has finished.	307	internally until the request has finished.
291		308
292	All functions return request objects of type L<IO::AIO::REQ> that allow	309	All functions return request objects of type L<IO::AIO::REQ> that allow
293	further manipulation of those requests while they are in-flight.	310	further manipulation of those requests while they are in-flight.
294		311
295	The pathnames you pass to these routines I<must> be absolute and	312	The pathnames you pass to these routines I<should> be absolute. The
296	encoded as octets. The reason for the former is that at the time the	313	reason for this is that at the time the request is being executed, the
297	request is being executed, the current working directory could have	314	current working directory could have changed. Alternatively, you can
298	changed. Alternatively, you can make sure that you never change the	315	make sure that you never change the current working directory anywhere
299	current working directory anywhere in the program and then use relative	316	in the program and then use relative paths. You can also take advantage
300	paths.	317	of IO::AIOs working directory abstraction, that lets you specify paths
		318	relative to some previously-opened "working directory object" - see the
		319	description of the C<IO::AIO::WD> class later in this document.
301		320
302	To encode pathnames as octets, either make sure you either: a) always pass	321	To encode pathnames as octets, either make sure you either: a) always pass
303	in filenames you got from outside (command line, readdir etc.) without	322	in filenames you got from outside (command line, readdir etc.) without
304	tinkering, b) are ASCII or ISO 8859-1, c) use the Encode module and encode	323	tinkering, b) are in your native filesystem encoding, c) use the Encode
305	your pathnames to the locale (or other) encoding in effect in the user	324	module and encode your pathnames to the locale (or other) encoding in
306	environment, d) use Glib::filename_from_unicode on unicode filenames or e)	325	effect in the user environment, d) use Glib::filename_from_unicode on
307	use something else to ensure your scalar has the correct contents.	326	unicode filenames or e) use something else to ensure your scalar has the
		327	correct contents.
308		328
309	This works, btw. independent of the internal UTF-8 bit, which IO::AIO	329	This works, btw. independent of the internal UTF-8 bit, which IO::AIO
310	handles correctly whether it is set or not.	330	handles correctly whether it is set or not.
		331
		332	=head2 AIO REQUEST FUNCTIONS
311		333
312	=over 4	334	=over 4
313		335
314	=item $prev_pri = aioreq_pri [$pri]	336	=item $prev_pri = aioreq_pri [$pri]
315		337
…		…
345		367
346		368
347	=item aio_open $pathname, $flags, $mode, $callback->($fh)	369	=item aio_open $pathname, $flags, $mode, $callback->($fh)
348		370
349	Asynchronously open or create a file and call the callback with a newly	371	Asynchronously open or create a file and call the callback with a newly
350	created filehandle for the file.	372	created filehandle for the file (or C<undef> in case of an error).
351		373
352	The pathname passed to C<aio_open> must be absolute. See API NOTES, above,	374	The pathname passed to C<aio_open> must be absolute. See API NOTES, above,
353	for an explanation.	375	for an explanation.
354		376
355	The C<$flags> argument is a bitmask. See the C<Fcntl> module for a	377	The C<$flags> argument is a bitmask. See the C<Fcntl> module for a
…		…
378	following POSIX and non-POSIX constants are available (missing ones on	400	following POSIX and non-POSIX constants are available (missing ones on
379	your system are, as usual, C<0>):	401	your system are, as usual, C<0>):
380		402
381	C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>,	403	C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>,
382	C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>,	404	C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>,
383	C<O_RSYNC>, C<O_SYNC> and C<O_TTY_INIT>.	405	C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, and C<O_TTY_INIT>.
384		406
385		407
386	=item aio_close $fh, $callback->($status)	408	=item aio_close $fh, $callback->($status)
387		409
388	Asynchronously close a file and call the callback with the result	410	Asynchronously close a file and call the callback with the result
…		…
398	Or in other words: the file descriptor will be closed, but it will not be	420	Or in other words: the file descriptor will be closed, but it will not be
399	free for reuse until the perl filehandle is closed.	421	free for reuse until the perl filehandle is closed.
400		422
401	=cut	423	=cut
402		424
		425	=item aio_seek $fh, $offset, $whence, $callback->($offs)
		426
		427	Seeks the filehandle to the new C<$offset>, similarly to perl's
		428	C<sysseek>. The C<$whence> can use the traditional values (C<0> for
		429	C<IO::AIO::SEEK_SET>, C<1> for C<IO::AIO::SEEK_CUR> or C<2> for
		430	C<IO::AIO::SEEK_END>).
		431
		432	The resulting absolute offset will be passed to the callback, or C<-1> in
		433	case of an error.
		434
		435	In theory, the C<$whence> constants could be different than the
		436	corresponding values from L<Fcntl>, but perl guarantees they are the same,
		437	so don't panic.
		438
		439	As a GNU/Linux (and maybe Solaris) extension, also the constants
		440	C<IO::AIO::SEEK_DATA> and C<IO::AIO::SEEK_HOLE> are available, if they
		441	could be found. No guarantees about suitability for use in C<aio_seek> or
		442	Perl's C<sysseek> can be made though, although I would naively assume they
		443	"just work".
		444
403	=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)	445	=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
404		446
405	=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)	447	=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
406		448
407	Reads or writes C<$length> bytes from or to the specified C<$fh> and	449	Reads or writes C<$length> bytes from or to the specified C<$fh> and
408	C<$offset> into the scalar given by C<$data> and offset C<$dataoffset>	450	C<$offset> into the scalar given by C<$data> and offset C<$dataoffset> and
409	and calls the callback without the actual number of bytes read (or -1 on	451	calls the callback with the actual number of bytes transferred (or -1 on
410	error, just like the syscall).	452	error, just like the syscall).
411		453
412	C<aio_read> will, like C<sysread>, shrink or grow the C<$data> scalar to	454	C<aio_read> will, like C<sysread>, shrink or grow the C<$data> scalar to
413	offset plus the actual number of bytes read.	455	offset plus the actual number of bytes read.
414		456
…		…
472	As native sendfile syscalls (as practically any non-POSIX interface hacked	514	As native sendfile syscalls (as practically any non-POSIX interface hacked
473	together in a hurry to improve benchmark numbers) tend to be rather buggy	515	together in a hurry to improve benchmark numbers) tend to be rather buggy
474	on many systems, this implementation tries to work around some known bugs	516	on many systems, this implementation tries to work around some known bugs
475	in Linux and FreeBSD kernels (probably others, too), but that might fail,	517	in Linux and FreeBSD kernels (probably others, too), but that might fail,
476	so you really really should check the return value of C<aio_sendfile> -	518	so you really really should check the return value of C<aio_sendfile> -
477	fewre bytes than expected might have been transferred.	519	fewer bytes than expected might have been transferred.
478		520
479		521
480	=item aio_readahead $fh,$offset,$length, $callback->($retval)	522	=item aio_readahead $fh,$offset,$length, $callback->($retval)
481		523
482	C<aio_readahead> populates the page cache with data from a file so that	524	C<aio_readahead> populates the page cache with data from a file so that
…		…
486	whole pages, so that offset is effectively rounded down to a page boundary	528	whole pages, so that offset is effectively rounded down to a page boundary
487	and bytes are read up to the next page boundary greater than or equal to	529	and bytes are read up to the next page boundary greater than or equal to
488	(off-set+length). C<aio_readahead> does not read beyond the end of the	530	(off-set+length). C<aio_readahead> does not read beyond the end of the
489	file. The current file offset of the file is left unchanged.	531	file. The current file offset of the file is left unchanged.
490		532
491	If that syscall doesn't exist (likely if your OS isn't Linux) it will be	533	If that syscall doesn't exist (likely if your kernel isn't Linux) it will
492	emulated by simply reading the data, which would have a similar effect.	534	be emulated by simply reading the data, which would have a similar effect.
493		535
494		536
495	=item aio_stat $fh_or_path, $callback->($status)	537	=item aio_stat $fh_or_path, $callback->($status)
496		538
497	=item aio_lstat $fh, $callback->($status)	539	=item aio_lstat $fh, $callback->($status)
…		…
566	namemax => 255,	608	namemax => 255,
567	frsize => 1024,	609	frsize => 1024,
568	fsid => 1810	610	fsid => 1810
569	}	611	}
570		612
		613	Here is a (likely partial - send me updates!) list of fsid values used by
		614	Linux - it is safe to hardcode these when C<$^O> is C<linux>:
		615
		616	0x0000adf5 adfs
		617	0x0000adff affs
		618	0x5346414f afs
		619	0x09041934 anon-inode filesystem
		620	0x00000187 autofs
		621	0x42465331 befs
		622	0x1badface bfs
		623	0x42494e4d binfmt_misc
		624	0x9123683e btrfs
		625	0x0027e0eb cgroupfs
		626	0xff534d42 cifs
		627	0x73757245 coda
		628	0x012ff7b7 coh
		629	0x28cd3d45 cramfs
		630	0x453dcd28 cramfs-wend (wrong endianness)
		631	0x64626720 debugfs
		632	0x00001373 devfs
		633	0x00001cd1 devpts
		634	0x0000f15f ecryptfs
		635	0x00414a53 efs
		636	0x0000137d ext
		637	0x0000ef53 ext2/ext3/ext4
		638	0x0000ef51 ext2
		639	0xf2f52010 f2fs
		640	0x00004006 fat
		641	0x65735546 fuseblk
		642	0x65735543 fusectl
		643	0x0bad1dea futexfs
		644	0x01161970 gfs2
		645	0x47504653 gpfs
		646	0x00004244 hfs
		647	0xf995e849 hpfs
		648	0x00c0ffee hostfs
		649	0x958458f6 hugetlbfs
		650	0x2bad1dea inotifyfs
		651	0x00009660 isofs
		652	0x000072b6 jffs2
		653	0x3153464a jfs
		654	0x6b414653 k-afs
		655	0x0bd00bd0 lustre
		656	0x0000137f minix
		657	0x0000138f minix 30 char names
		658	0x00002468 minix v2
		659	0x00002478 minix v2 30 char names
		660	0x00004d5a minix v3
		661	0x19800202 mqueue
		662	0x00004d44 msdos
		663	0x0000564c novell
		664	0x00006969 nfs
		665	0x6e667364 nfsd
		666	0x00003434 nilfs
		667	0x5346544e ntfs
		668	0x00009fa1 openprom
		669	0x7461636F ocfs2
		670	0x00009fa0 proc
		671	0x6165676c pstorefs
		672	0x0000002f qnx4
		673	0x68191122 qnx6
		674	0x858458f6 ramfs
		675	0x52654973 reiserfs
		676	0x00007275 romfs
		677	0x67596969 rpc_pipefs
		678	0x73636673 securityfs
		679	0xf97cff8c selinux
		680	0x0000517b smb
		681	0x534f434b sockfs
		682	0x73717368 squashfs
		683	0x62656572 sysfs
		684	0x012ff7b6 sysv2
		685	0x012ff7b5 sysv4
		686	0x01021994 tmpfs
		687	0x15013346 udf
		688	0x00011954 ufs
		689	0x54190100 ufs byteswapped
		690	0x00009fa2 usbdevfs
		691	0x01021997 v9fs
		692	0xa501fcf5 vxfs
		693	0xabba1974 xenfs
		694	0x012ff7b4 xenix
		695	0x58465342 xfs
		696	0x012fd16d xia
571		697
572	=item aio_utime $fh_or_path, $atime, $mtime, $callback->($status)	698	=item aio_utime $fh_or_path, $atime, $mtime, $callback->($status)
573		699
574	Works like perl's C<utime> function (including the special case of $atime	700	Works like perl's C<utime> function (including the special case of $atime
575	and $mtime being undef). Fractional times are supported if the underlying	701	and $mtime being undef). Fractional times are supported if the underlying
…		…
603	=item aio_truncate $fh_or_path, $offset, $callback->($status)	729	=item aio_truncate $fh_or_path, $offset, $callback->($status)
604		730
605	Works like truncate(2) or ftruncate(2).	731	Works like truncate(2) or ftruncate(2).
606		732
607		733
		734	=item aio_allocate $fh, $mode, $offset, $len, $callback->($status)
		735
		736	Allocates or frees disk space according to the C<$mode> argument. See the
		737	linux C<fallocate> documentation for details.
		738
		739	C<$mode> is usually C<0> or C<IO::AIO::FALLOC_FL_KEEP_SIZE> to allocate
		740	space, or C<IO::AIO::FALLOC_FL_PUNCH_HOLE \| IO::AIO::FALLOC_FL_KEEP_SIZE>,
		741	to deallocate a file range.
		742
		743	IO::AIO also supports C<FALLOC_FL_COLLAPSE_RANGE>, to remove a range
		744	(without leaving a hole) and C<FALLOC_FL_ZERO_RANGE>, to zero a range (see
		745	your L<fallocate(2)> manpage).
		746
		747	The file system block size used by C<fallocate> is presumably the
		748	C<f_bsize> returned by C<statvfs>.
		749
		750	If C<fallocate> isn't available or cannot be emulated (currently no
		751	emulation will be attempted), passes C<-1> and sets C<$!> to C<ENOSYS>.
		752
		753
608	=item aio_chmod $fh_or_path, $mode, $callback->($status)	754	=item aio_chmod $fh_or_path, $mode, $callback->($status)
609		755
610	Works like perl's C<chmod> function.	756	Works like perl's C<chmod> function.
611		757
612		758
…		…
614		760
615	Asynchronously unlink (delete) a file and call the callback with the	761	Asynchronously unlink (delete) a file and call the callback with the
616	result code.	762	result code.
617		763
618		764
619	=item aio_mknod $path, $mode, $dev, $callback->($status)	765	=item aio_mknod $pathname, $mode, $dev, $callback->($status)
620		766
621	[EXPERIMENTAL]	767	[EXPERIMENTAL]
622		768
623	Asynchronously create a device node (or fifo). See mknod(2).	769	Asynchronously create a device node (or fifo). See mknod(2).
624		770
625	The only (POSIX-) portable way of calling this function is:	771	The only (POSIX-) portable way of calling this function is:
626		772
627	aio_mknod $path, IO::AIO::S_IFIFO \| $mode, 0, sub { ...	773	aio_mknod $pathname, IO::AIO::S_IFIFO \| $mode, 0, sub { ...
628		774
629	See C<aio_stat> for info about some potentially helpful extra constants	775	See C<aio_stat> for info about some potentially helpful extra constants
630	and functions.	776	and functions.
631		777
632	=item aio_link $srcpath, $dstpath, $callback->($status)	778	=item aio_link $srcpath, $dstpath, $callback->($status)
…		…
639		785
640	Asynchronously create a new symbolic link to the existing object at C<$srcpath> at	786	Asynchronously create a new symbolic link to the existing object at C<$srcpath> at
641	the path C<$dstpath> and call the callback with the result code.	787	the path C<$dstpath> and call the callback with the result code.
642		788
643		789
644	=item aio_readlink $path, $callback->($link)	790	=item aio_readlink $pathname, $callback->($link)
645		791
646	Asynchronously read the symlink specified by C<$path> and pass it to	792	Asynchronously read the symlink specified by C<$path> and pass it to
647	the callback. If an error occurs, nothing or undef gets passed to the	793	the callback. If an error occurs, nothing or undef gets passed to the
648	callback.	794	callback.
649		795
650		796
651	=item aio_realpath $path, $callback->($path)	797	=item aio_realpath $pathname, $callback->($path)
652		798
653	Asynchronously make the path absolute and resolve any symlinks in	799	Asynchronously make the path absolute and resolve any symlinks in
654	C<$path>. The resulting path only consists of directories (Same as	800	C<$path>. The resulting path only consists of directories (same as
655	L<Cwd::realpath>).	801	L<Cwd::realpath>).
656		802
657	This request can be used to get the absolute path of the current working	803	This request can be used to get the absolute path of the current working
658	directory by passing it a path of F<.> (a single dot).	804	directory by passing it a path of F<.> (a single dot).
659		805
660		806
661	=item aio_rename $srcpath, $dstpath, $callback->($status)	807	=item aio_rename $srcpath, $dstpath, $callback->($status)
662		808
663	Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as	809	Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as
664	rename(2) and call the callback with the result code.	810	rename(2) and call the callback with the result code.
		811
		812	On systems that support the AIO::WD working directory abstraction
		813	natively, the case C<[$wd, "."]> as C<$srcpath> is specialcased - instead
		814	of failing, C<rename> is called on the absolute path of C<$wd>.
665		815
666		816
667	=item aio_mkdir $pathname, $mode, $callback->($status)	817	=item aio_mkdir $pathname, $mode, $callback->($status)
668		818
669	Asynchronously mkdir (create) a directory and call the callback with	819	Asynchronously mkdir (create) a directory and call the callback with
…		…
674	=item aio_rmdir $pathname, $callback->($status)	824	=item aio_rmdir $pathname, $callback->($status)
675		825
676	Asynchronously rmdir (delete) a directory and call the callback with the	826	Asynchronously rmdir (delete) a directory and call the callback with the
677	result code.	827	result code.
678		828
		829	On systems that support the AIO::WD working directory abstraction
		830	natively, the case C<[$wd, "."]> is specialcased - instead of failing,
		831	C<rmdir> is called on the absolute path of C<$wd>.
		832
679		833
680	=item aio_readdir $pathname, $callback->($entries)	834	=item aio_readdir $pathname, $callback->($entries)
681		835
682	Unlike the POSIX call of the same name, C<aio_readdir> reads an entire	836	Unlike the POSIX call of the same name, C<aio_readdir> reads an entire
683	directory (i.e. opendir + readdir + closedir). The entries will not be	837	directory (i.e. opendir + readdir + closedir). The entries will not be
…		…
687	array-ref with the filenames.	841	array-ref with the filenames.
688		842
689		843
690	=item aio_readdirx $pathname, $flags, $callback->($entries, $flags)	844	=item aio_readdirx $pathname, $flags, $callback->($entries, $flags)
691		845
692	Quite similar to C<aio_readdir>, but the C<$flags> argument allows to tune	846	Quite similar to C<aio_readdir>, but the C<$flags> argument allows one to
693	behaviour and output format. In case of an error, C<$entries> will be	847	tune behaviour and output format. In case of an error, C<$entries> will be
694	C<undef>.	848	C<undef>.
695		849
696	The flags are a combination of the following constants, ORed together (the	850	The flags are a combination of the following constants, ORed together (the
697	flags will also be passed to the callback, possibly modified):	851	flags will also be passed to the callback, possibly modified):
698		852
…		…
745		899
746	=item IO::AIO::READDIR_FOUND_UNKNOWN	900	=item IO::AIO::READDIR_FOUND_UNKNOWN
747		901
748	This flag should not be set when calling C<aio_readdirx>. Instead, it	902	This flag should not be set when calling C<aio_readdirx>. Instead, it
749	is being set by C<aio_readdirx>, when any of the C<$type>'s found were	903	is being set by C<aio_readdirx>, when any of the C<$type>'s found were
750	C<IO::AIO::DT_UNKNOWN>. The absense of this flag therefore indicates that all	904	C<IO::AIO::DT_UNKNOWN>. The absence of this flag therefore indicates that all
751	C<$type>'s are known, which can be used to speed up some algorithms.	905	C<$type>'s are known, which can be used to speed up some algorithms.
752		906
753	=back	907	=back
754		908
755		909
756	=item aio_load $path, $data, $callback->($status)	910	=item aio_load $pathname, $data, $callback->($status)
757		911
758	This is a composite request that tries to fully load the given file into	912	This is a composite request that tries to fully load the given file into
759	memory. Status is the same as with aio_read.	913	memory. Status is the same as with aio_read.
760		914
761	=cut	915	=cut
…		…
896	};	1050	};
897		1051
898	$grp	1052	$grp
899	}	1053	}
900		1054
901	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)	1055	=item aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs)
902		1056
903	Scans a directory (similar to C<aio_readdir>) but additionally tries to	1057	Scans a directory (similar to C<aio_readdir>) but additionally tries to
904	efficiently separate the entries of directory C<$path> into two sets of	1058	efficiently separate the entries of directory C<$path> into two sets of
905	names, directories you can recurse into (directories), and ones you cannot	1059	names, directories you can recurse into (directories), and ones you cannot
906	recurse into (everything else, including symlinks to directories).	1060	recurse into (everything else, including symlinks to directories).
…		…
937	Then entries will be sorted into likely directories a non-initial dot	1091	Then entries will be sorted into likely directories a non-initial dot
938	currently) and likely non-directories (see C<aio_readdirx>). Then every	1092	currently) and likely non-directories (see C<aio_readdirx>). Then every
939	entry plus an appended C</.> will be C<stat>'ed, likely directories first,	1093	entry plus an appended C</.> will be C<stat>'ed, likely directories first,
940	in order of their inode numbers. If that succeeds, it assumes that the	1094	in order of their inode numbers. If that succeeds, it assumes that the
941	entry is a directory or a symlink to directory (which will be checked	1095	entry is a directory or a symlink to directory (which will be checked
942	seperately). This is often faster than stat'ing the entry itself because	1096	separately). This is often faster than stat'ing the entry itself because
943	filesystems might detect the type of the entry without reading the inode	1097	filesystems might detect the type of the entry without reading the inode
944	data (e.g. ext2fs filetype feature), even on systems that cannot return	1098	data (e.g. ext2fs filetype feature), even on systems that cannot return
945	the filetype information on readdir.	1099	the filetype information on readdir.
946		1100
947	If the known number of directories (link count - 2) has been reached, the	1101	If the known number of directories (link count - 2) has been reached, the
…		…
963		1117
964	my $grp = aio_group $cb;	1118	my $grp = aio_group $cb;
965		1119
966	$maxreq = 4 if $maxreq <= 0;	1120	$maxreq = 4 if $maxreq <= 0;
967		1121
968	# stat once	1122	# get a wd object
969	aioreq_pri $pri;	1123	aioreq_pri $pri;
970	add $grp aio_stat $path, sub {	1124	add $grp aio_wd $path, sub {
		1125	$_[0]
971	return $grp->result () if $_[0];	1126	or return $grp->result ();
972	my $now = time;
973	my $hash1 = join ":", (stat _)[0,1,3,7,9];
974		1127
975	# read the directory entries	1128	my $wd = [shift, "."];
		1129
		1130	# stat once
976	aioreq_pri $pri;	1131	aioreq_pri $pri;
977	add $grp aio_readdirx $path, READDIR_DIRS_FIRST, sub {	1132	add $grp aio_stat $wd, sub {
978	my $entries = shift
979	or return $grp->result ();	1133	return $grp->result () if $_[0];
		1134	my $now = time;
		1135	my $hash1 = join ":", (stat _)[0,1,3,7,9];
980		1136
981	# stat the dir another time	1137	# read the directory entries
982	aioreq_pri $pri;	1138	aioreq_pri $pri;
		1139	add $grp aio_readdirx $wd, READDIR_DIRS_FIRST, sub {
		1140	my $entries = shift
		1141	or return $grp->result ();
		1142
		1143	# stat the dir another time
		1144	aioreq_pri $pri;
983	add $grp aio_stat $path, sub {	1145	add $grp aio_stat $wd, sub {
984	my $hash2 = join ":", (stat _)[0,1,3,7,9];	1146	my $hash2 = join ":", (stat _)[0,1,3,7,9];
985		1147
986	my $ndirs;	1148	my $ndirs;
987		1149
988	# take the slow route if anything looks fishy	1150	# take the slow route if anything looks fishy
989	if ($hash1 ne $hash2 or (stat _)[9] == $now) {	1151	if ($hash1 ne $hash2 or (stat _)[9] == $now) {
990	$ndirs = -1;	1152	$ndirs = -1;
991	} else {	1153	} else {
992	# if nlink == 2, we are finished	1154	# if nlink == 2, we are finished
993	# for non-posix-fs's, we rely on nlink < 2	1155	# for non-posix-fs's, we rely on nlink < 2
994	$ndirs = (stat _)[3] - 2	1156	$ndirs = (stat _)[3] - 2
995	or return $grp->result ([], $entries);	1157	or return $grp->result ([], $entries);
996	}	1158	}
997		1159
998	my (@dirs, @nondirs);	1160	my (@dirs, @nondirs);
999		1161
1000	my $statgrp = add $grp aio_group sub {	1162	my $statgrp = add $grp aio_group sub {
1001	$grp->result (\@dirs, \@nondirs);	1163	$grp->result (\@dirs, \@nondirs);
1002	};	1164	};
1003		1165
1004	limit $statgrp $maxreq;	1166	limit $statgrp $maxreq;
1005	feed $statgrp sub {	1167	feed $statgrp sub {
1006	return unless @$entries;	1168	return unless @$entries;
1007	my $entry = shift @$entries;	1169	my $entry = shift @$entries;
1008		1170
1009	aioreq_pri $pri;	1171	aioreq_pri $pri;
		1172	$wd->[1] = "$entry/.";
1010	add $statgrp aio_stat "$path/$entry/.", sub {	1173	add $statgrp aio_stat $wd, sub {
1011	if ($_[0] < 0) {	1174	if ($_[0] < 0) {
1012	push @nondirs, $entry;	1175	push @nondirs, $entry;
1013	} else {	1176	} else {
1014	# need to check for real directory	1177	# need to check for real directory
1015	aioreq_pri $pri;	1178	aioreq_pri $pri;
		1179	$wd->[1] = $entry;
1016	add $statgrp aio_lstat "$path/$entry", sub {	1180	add $statgrp aio_lstat $wd, sub {
1017	if (-d _) {	1181	if (-d _) {
1018	push @dirs, $entry;	1182	push @dirs, $entry;
1019		1183
1020	unless (--$ndirs) {	1184	unless (--$ndirs) {
1021	push @nondirs, @$entries;	1185	push @nondirs, @$entries;
1022	feed $statgrp;	1186	feed $statgrp;
		1187	}
		1188	} else {
		1189	push @nondirs, $entry;
1023	}	1190	}
1024	} else {
1025	push @nondirs, $entry;
1026	}	1191	}
1027	}	1192	}
1028	}	1193	};
1029	};	1194	};
1030	};	1195	};
1031	};	1196	};
1032	};	1197	};
1033	};	1198	};
1034		1199
1035	$grp	1200	$grp
1036	}	1201	}
1037		1202
1038	=item aio_rmtree $path, $callback->($status)	1203	=item aio_rmtree $pathname, $callback->($status)
1039		1204
1040	Delete a directory tree starting (and including) C<$path>, return the	1205	Delete a directory tree starting (and including) C<$path>, return the
1041	status of the final C<rmdir> only. This is a composite request that	1206	status of the final C<rmdir> only. This is a composite request that
1042	uses C<aio_scandir> to recurse into and rmdir directories, and unlink	1207	uses C<aio_scandir> to recurse into and rmdir directories, and unlink
1043	everything else.	1208	everything else.
1044		1209
1045	=cut	1210	=cut
1046		1211
…		…
1068	};	1233	};
1069		1234
1070	$grp	1235	$grp
1071	}	1236	}
1072		1237
		1238	=item aio_fcntl $fh, $cmd, $arg, $callback->($status)
		1239
		1240	=item aio_ioctl $fh, $request, $buf, $callback->($status)
		1241
		1242	These work just like the C<fcntl> and C<ioctl> built-in functions, except
		1243	they execute asynchronously and pass the return value to the callback.
		1244
		1245	Both calls can be used for a lot of things, some of which make more sense
		1246	to run asynchronously in their own thread, while some others make less
		1247	sense. For example, calls that block waiting for external events, such
		1248	as locking, will also lock down an I/O thread while it is waiting, which
		1249	can deadlock the whole I/O system. At the same time, there might be no
		1250	alternative to using a thread to wait.
		1251
		1252	So in general, you should only use these calls for things that do
		1253	(filesystem) I/O, not for things that wait for other events (network,
		1254	other processes), although if you are careful and know what you are doing,
		1255	you still can.
		1256
		1257	The following constants are available (missing ones are, as usual C<0>):
		1258
		1259	C<FIFREEZE>, C<FITHAW>, C<FITRIM>, C<FICLONE>, C<FICLONERANGE>, C<FIDEDUPERANGE>.
		1260
		1261	C<FS_IOC_GETFLAGS>, C<FS_IOC_SETFLAGS>, C<FS_IOC_GETVERSION>, C<FS_IOC_SETVERSION>,
		1262	C<FS_IOC_FIEMAP>.
		1263
		1264	C<FS_IOC_FSGETXATTR>, C<FS_IOC_FSSETXATTR>, C<FS_IOC_SET_ENCRYPTION_POLICY>,
		1265	C<FS_IOC_GET_ENCRYPTION_PWSALT>, C<FS_IOC_GET_ENCRYPTION_POLICY>, C<FS_KEY_DESCRIPTOR_SIZE>.
		1266
		1267	C<FS_SECRM_FL>, C<FS_UNRM_FL>, C<FS_COMPR_FL>, C<FS_SYNC_FL>, C<FS_IMMUTABLE_FL>,
		1268	C<FS_APPEND_FL>, C<FS_NODUMP_FL>, C<FS_NOATIME_FL>, C<FS_DIRTY_FL>,
		1269	C<FS_COMPRBLK_FL>, C<FS_NOCOMP_FL>, C<FS_ENCRYPT_FL>, C<FS_BTREE_FL>,
		1270	C<FS_INDEX_FL>, C<FS_JOURNAL_DATA_FL>, C<FS_NOTAIL_FL>, C<FS_DIRSYNC_FL>, C<FS_TOPDIR_FL>,
		1271	C<FS_FL_USER_MODIFIABLE>.
		1272
		1273	C<FS_XFLAG_REALTIME>, C<FS_XFLAG_PREALLOC>, C<FS_XFLAG_IMMUTABLE>, C<FS_XFLAG_APPEND>,
		1274	C<FS_XFLAG_SYNC>, C<FS_XFLAG_NOATIME>, C<FS_XFLAG_NODUMP>, C<FS_XFLAG_RTINHERIT>,
		1275	C<FS_XFLAG_PROJINHERIT>, C<FS_XFLAG_NOSYMLINKS>, C<FS_XFLAG_EXTSIZE>, C<FS_XFLAG_EXTSZINHERIT>,
		1276	C<FS_XFLAG_NODEFRAG>, C<FS_XFLAG_FILESTREAM>, C<FS_XFLAG_DAX>, C<FS_XFLAG_HASATTR>,
		1277
1073	=item aio_sync $callback->($status)	1278	=item aio_sync $callback->($status)
1074		1279
1075	Asynchronously call sync and call the callback when finished.	1280	Asynchronously call sync and call the callback when finished.
1076		1281
1077	=item aio_fsync $fh, $callback->($status)	1282	=item aio_fsync $fh, $callback->($status)
…		…
1104	C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>,	1309	C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>,
1105	C<IO::AIO::SYNC_FILE_RANGE_WRITE> and	1310	C<IO::AIO::SYNC_FILE_RANGE_WRITE> and
1106	C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range	1311	C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range
1107	manpage for details.	1312	manpage for details.
1108		1313
1109	=item aio_pathsync $path, $callback->($status)	1314	=item aio_pathsync $pathname, $callback->($status)
1110		1315
1111	This request tries to open, fsync and close the given path. This is a	1316	This request tries to open, fsync and close the given path. This is a
1112	composite request intended to sync directories after directory operations	1317	composite request intended to sync directories after directory operations
1113	(E.g. rename). This might not work on all operating systems or have any	1318	(E.g. rename). This might not work on all operating systems or have any
1114	specific effect, but usually it makes sure that directory changes get	1319	specific effect, but usually it makes sure that directory changes get
…		…
1166		1371
1167	This is a rather advanced IO::AIO call, which works best on mmap(2)ed	1372	This is a rather advanced IO::AIO call, which works best on mmap(2)ed
1168	scalars.	1373	scalars.
1169		1374
1170	It touches (reads or writes) all memory pages in the specified	1375	It touches (reads or writes) all memory pages in the specified
1171	range inside the scalar. All caveats and parameters are the same	1376	range inside the scalar. All caveats and parameters are the same
1172	as for C<aio_msync>, above, except for flags, which must be either	1377	as for C<aio_msync>, above, except for flags, which must be either
1173	C<0> (which reads all pages and ensures they are instantiated) or	1378	C<0> (which reads all pages and ensures they are instantiated) or
1174	C<IO::AIO::MT_MODIFY>, which modifies the memory page s(by reading and	1379	C<IO::AIO::MT_MODIFY>, which modifies the memory pages (by reading and
1175	writing an octet from it, which dirties the page).	1380	writing an octet from it, which dirties the page).
1176		1381
1177	=item aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status)	1382	=item aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status)
1178		1383
1179	This is a rather advanced IO::AIO call, which works best on mmap(2)ed	1384	This is a rather advanced IO::AIO call, which works best on mmap(2)ed
…		…
1210	documented under L<MISCELLANEOUS FUNCTIONS>.	1415	documented under L<MISCELLANEOUS FUNCTIONS>.
1211		1416
1212	Example: asynchronously lock all current and future pages into memory.	1417	Example: asynchronously lock all current and future pages into memory.
1213		1418
1214	aio_mlockall IO::AIO::MCL_FUTURE;	1419	aio_mlockall IO::AIO::MCL_FUTURE;
		1420
		1421	=item aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents)
		1422
		1423	Queries the extents of the given file (by calling the Linux C<FIEMAP>
		1424	ioctl, see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If
		1425	the ioctl is not available on your OS, then this request will fail with
		1426	C<ENOSYS>.
		1427
		1428	C<$start> is the starting offset to query extents for, C<$length> is the
		1429	size of the range to query - if it is C<undef>, then the whole file will
		1430	be queried.
		1431
		1432	C<$flags> is a combination of flags (C<IO::AIO::FIEMAP_FLAG_SYNC> or
		1433	C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also
		1434	exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query
		1435	the data portion.
		1436
		1437	C<$count> is the maximum number of extent records to return. If it is
		1438	C<undef>, then IO::AIO queries all extents of the range. As a very special
		1439	case, if it is C<0>, then the callback receives the number of extents
		1440	instead of the extents themselves (which is unreliable, see below).
		1441
		1442	If an error occurs, the callback receives no arguments. The special
		1443	C<errno> value C<IO::AIO::EBADR> is available to test for flag errors.
		1444
		1445	Otherwise, the callback receives an array reference with extent
		1446	structures. Each extent structure is an array reference itself, with the
		1447	following members:
		1448
		1449	[$logical, $physical, $length, $flags]
		1450
		1451	Flags is any combination of the following flag values (typically either C<0>
		1452	or C<IO::AIO::FIEMAP_EXTENT_LAST> (1)):
		1453
		1454	C<IO::AIO::FIEMAP_EXTENT_LAST>, C<IO::AIO::FIEMAP_EXTENT_UNKNOWN>,
		1455	C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>,
		1456	C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>,
		1457	C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>,
		1458	C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or
		1459	C<IO::AIO::FIEMAP_EXTENT_SHARED>.
		1460
		1461	At the time of this writing (Linux 3.2), this requets is unreliable unless
		1462	C<$count> is C<undef>, as the kernel has all sorts of bugs preventing
		1463	it to return all extents of a range for files with large number of
		1464	extents. The code works around all these issues if C<$count> is undef.
1215		1465
1216	=item aio_group $callback->(...)	1466	=item aio_group $callback->(...)
1217		1467
1218	This is a very special aio request: Instead of doing something, it is a	1468	This is a very special aio request: Instead of doing something, it is a
1219	container for other aio requests, which is useful if you want to bundle	1469	container for other aio requests, which is useful if you want to bundle
…		…
1256	like sleep and file handle readable/writable, the overhead this creates is	1506	like sleep and file handle readable/writable, the overhead this creates is
1257	immense (it blocks a thread for a long time) so do not use this function	1507	immense (it blocks a thread for a long time) so do not use this function
1258	except to put your application under artificial I/O pressure.	1508	except to put your application under artificial I/O pressure.
1259		1509
1260	=back	1510	=back
		1511
		1512
		1513	=head2 IO::AIO::WD - multiple working directories
		1514
		1515	Your process only has one current working directory, which is used by all
		1516	threads. This makes it hard to use relative paths (some other component
		1517	could call C<chdir> at any time, and it is hard to control when the path
		1518	will be used by IO::AIO).
		1519
		1520	One solution for this is to always use absolute paths. This usually works,
		1521	but can be quite slow (the kernel has to walk the whole path on every
		1522	access), and can also be a hassle to implement.
		1523
		1524	Newer POSIX systems have a number of functions (openat, fdopendir,
		1525	futimensat and so on) that make it possible to specify working directories
		1526	per operation.
		1527
		1528	For portability, and because the clowns who "designed", or shall I write,
		1529	perpetrated this new interface were obviously half-drunk, this abstraction
		1530	cannot be perfect, though.
		1531
		1532	IO::AIO allows you to convert directory paths into a so-called IO::AIO::WD
		1533	object. This object stores the canonicalised, absolute version of the
		1534	path, and on systems that allow it, also a directory file descriptor.
		1535
		1536	Everywhere where a pathname is accepted by IO::AIO (e.g. in C<aio_stat>
		1537	or C<aio_unlink>), one can specify an array reference with an IO::AIO::WD
		1538	object and a pathname instead (or the IO::AIO::WD object alone, which
		1539	gets interpreted as C<[$wd, "."]>). If the pathname is absolute, the
		1540	IO::AIO::WD object is ignored, otherwise the pathname is resolved relative
		1541	to that IO::AIO::WD object.
		1542
		1543	For example, to get a wd object for F</etc> and then stat F<passwd>
		1544	inside, you would write:
		1545
		1546	aio_wd "/etc", sub {
		1547	my $etcdir = shift;
		1548
		1549	# although $etcdir can be undef on error, there is generally no reason
		1550	# to check for errors here, as aio_stat will fail with ENOENT
		1551	# when $etcdir is undef.
		1552
		1553	aio_stat [$etcdir, "passwd"], sub {
		1554	# yay
		1555	};
		1556	};
		1557
		1558	The fact that C<aio_wd> is a request and not a normal function shows that
		1559	creating an IO::AIO::WD object is itself a potentially blocking operation,
		1560	which is why it is done asynchronously.
		1561
		1562	To stat the directory obtained with C<aio_wd> above, one could write
		1563	either of the following three request calls:
		1564
		1565	aio_lstat "/etc" , sub { ... # pathname as normal string
		1566	aio_lstat [$wd, "."], sub { ... # "." relative to $wd (i.e. $wd itself)
		1567	aio_lstat $wd , sub { ... # shorthand for the previous
		1568
		1569	As with normal pathnames, IO::AIO keeps a copy of the working directory
		1570	object and the pathname string, so you could write the following without
		1571	causing any issues due to C<$path> getting reused:
		1572
		1573	my $path = [$wd, undef];
		1574
		1575	for my $name (qw(abc def ghi)) {
		1576	$path->[1] = $name;
		1577	aio_stat $path, sub {
		1578	# ...
		1579	};
		1580	}
		1581
		1582	There are some caveats: when directories get renamed (or deleted), the
		1583	pathname string doesn't change, so will point to the new directory (or
		1584	nowhere at all), while the directory fd, if available on the system,
		1585	will still point to the original directory. Most functions accepting a
		1586	pathname will use the directory fd on newer systems, and the string on
		1587	older systems. Some functions (such as realpath) will always rely on the
		1588	string form of the pathname.
		1589
		1590	So this functionality is mainly useful to get some protection against
		1591	C<chdir>, to easily get an absolute path out of a relative path for future
		1592	reference, and to speed up doing many operations in the same directory
		1593	(e.g. when stat'ing all files in a directory).
		1594
		1595	The following functions implement this working directory abstraction:
		1596
		1597	=over 4
		1598
		1599	=item aio_wd $pathname, $callback->($wd)
		1600
		1601	Asynchonously canonicalise the given pathname and convert it to an
		1602	IO::AIO::WD object representing it. If possible and supported on the
		1603	system, also open a directory fd to speed up pathname resolution relative
		1604	to this working directory.
		1605
		1606	If something goes wrong, then C<undef> is passwd to the callback instead
		1607	of a working directory object and C<$!> is set appropriately. Since
		1608	passing C<undef> as working directory component of a pathname fails the
		1609	request with C<ENOENT>, there is often no need for error checking in the
		1610	C<aio_wd> callback, as future requests using the value will fail in the
		1611	expected way.
		1612
		1613	=item IO::AIO::CWD
		1614
		1615	This is a compiletime constant (object) that represents the process
		1616	current working directory.
		1617
		1618	Specifying this object as working directory object for a pathname is as if
		1619	the pathname would be specified directly, without a directory object. For
		1620	example, these calls are functionally identical:
		1621
		1622	aio_stat "somefile", sub { ... };
		1623	aio_stat [IO::AIO::CWD, "somefile"], sub { ... };
		1624
		1625	=back
		1626
		1627	To recover the path associated with an IO::AIO::WD object, you can use
		1628	C<aio_realpath>:
		1629
		1630	aio_realpath $wd, sub {
		1631	warn "path is $_[0]\n";
		1632	};
		1633
		1634	Currently, C<aio_statvfs> always, and C<aio_rename> and C<aio_rmdir>
		1635	sometimes, fall back to using an absolue path.
1261		1636
1262	=head2 IO::AIO::REQ CLASS	1637	=head2 IO::AIO::REQ CLASS
1263		1638
1264	All non-aggregate C<aio_*> functions return an object of this class when	1639	All non-aggregate C<aio_*> functions return an object of this class when
1265	called in non-void context.	1640	called in non-void context.
…		…
1383		1758
1384	Sets a feeder/generator on this group: every group can have an attached	1759	Sets a feeder/generator on this group: every group can have an attached
1385	generator that generates requests if idle. The idea behind this is that,	1760	generator that generates requests if idle. The idea behind this is that,
1386	although you could just queue as many requests as you want in a group,	1761	although you could just queue as many requests as you want in a group,
1387	this might starve other requests for a potentially long time. For example,	1762	this might starve other requests for a potentially long time. For example,
1388	C<aio_scandir> might generate hundreds of thousands C<aio_stat> requests,	1763	C<aio_scandir> might generate hundreds of thousands of C<aio_stat>
1389	delaying any later requests for a long time.	1764	requests, delaying any later requests for a long time.
1390		1765
1391	To avoid this, and allow incremental generation of requests, you can	1766	To avoid this, and allow incremental generation of requests, you can
1392	instead a group and set a feeder on it that generates those requests. The	1767	instead a group and set a feeder on it that generates those requests. The
1393	feed callback will be called whenever there are few enough (see C<limit>,	1768	feed callback will be called whenever there are few enough (see C<limit>,
1394	below) requests active in the group itself and is expected to queue more	1769	below) requests active in the group itself and is expected to queue more
…		…
1443		1818
1444	See C<poll_cb> for an example.	1819	See C<poll_cb> for an example.
1445		1820
1446	=item IO::AIO::poll_cb	1821	=item IO::AIO::poll_cb
1447		1822
1448	Process some outstanding events on the result pipe. You have to call	1823	Process some requests that have reached the result phase (i.e. they have
		1824	been executed but the results are not yet reported). You have to call
		1825	this "regularly" to finish outstanding requests.
		1826
1449	this regularly. Returns C<0> if all events could be processed (or there	1827	Returns C<0> if all events could be processed (or there were no
1450	were no events to process), or C<-1> if it returned earlier for whatever	1828	events to process), or C<-1> if it returned earlier for whatever
1451	reason. Returns immediately when no events are outstanding. The amount of	1829	reason. Returns immediately when no events are outstanding. The amount
1452	events processed depends on the settings of C<IO::AIO::max_poll_req> and	1830	of events processed depends on the settings of C<IO::AIO::max_poll_req>,
1453	C<IO::AIO::max_poll_time>.	1831	C<IO::AIO::max_poll_time> and C<IO::AIO::max_outstanding>.
1454		1832
1455	If not all requests were processed for whatever reason, the filehandle	1833	If not all requests were processed for whatever reason, the poll file
1456	will still be ready when C<poll_cb> returns, so normally you don't have to	1834	descriptor will still be ready when C<poll_cb> returns, so normally you
1457	do anything special to have it called later.	1835	don't have to do anything special to have it called later.
1458		1836
1459	Apart from calling C<IO::AIO::poll_cb> when the event filehandle becomes	1837	Apart from calling C<IO::AIO::poll_cb> when the event filehandle becomes
1460	ready, it can be beneficial to call this function from loops which submit	1838	ready, it can be beneficial to call this function from loops which submit
1461	a lot of requests, to make sure the results get processed when they become	1839	a lot of requests, to make sure the results get processed when they become
1462	available and not just when the loop is finished and the event loop takes	1840	available and not just when the loop is finished and the event loop takes
…		…
1471	poll => 'r', async => 1,	1849	poll => 'r', async => 1,
1472	cb => \&IO::AIO::poll_cb);	1850	cb => \&IO::AIO::poll_cb);
1473		1851
1474	=item IO::AIO::poll_wait	1852	=item IO::AIO::poll_wait
1475		1853
1476	If there are any outstanding requests and none of them in the result	1854	Wait until either at least one request is in the result phase or no
1477	phase, wait till the result filehandle becomes ready for reading (simply	1855	requests are outstanding anymore.
1478	does a C<select> on the filehandle. This is useful if you want to	1856
1479	synchronously wait for some requests to finish).	1857	This is useful if you want to synchronously wait for some requests to
		1858	become ready, without actually handling them.
1480		1859
1481	See C<nreqs> for an example.	1860	See C<nreqs> for an example.
1482		1861
1483	=item IO::AIO::poll	1862	=item IO::AIO::poll
1484		1863
…		…
1605		1984
1606	This is a very bad function to use in interactive programs because it	1985	This is a very bad function to use in interactive programs because it
1607	blocks, and a bad way to reduce concurrency because it is inexact: Better	1986	blocks, and a bad way to reduce concurrency because it is inexact: Better
1608	use an C<aio_group> together with a feed callback.	1987	use an C<aio_group> together with a feed callback.
1609		1988
1610	It's main use is in scripts without an event loop - when you want to stat	1989	Its main use is in scripts without an event loop - when you want to stat
1611	a lot of files, you can write somehting like this:	1990	a lot of files, you can write somehting like this:
1612		1991
1613	IO::AIO::max_outstanding 32;	1992	IO::AIO::max_outstanding 32;
1614		1993
1615	for my $path (...) {	1994	for my $path (...) {
…		…
1655		2034
1656	=back	2035	=back
1657		2036
1658	=head3 MISCELLANEOUS FUNCTIONS	2037	=head3 MISCELLANEOUS FUNCTIONS
1659		2038
1660	IO::AIO implements some functions that might be useful, but are not	2039	IO::AIO implements some functions that are useful when you want to use
1661	asynchronous.	2040	some "Advanced I/O" function not available to in Perl, without going the
		2041	"Asynchronous I/O" route. Many of these have an asynchronous C<aio_*>
		2042	counterpart.
1662		2043
1663	=over 4	2044	=over 4
1664		2045
1665	=item IO::AIO::sendfile $ofh, $ifh, $offset, $count	2046	=item IO::AIO::sendfile $ofh, $ifh, $offset, $count
1666		2047
…		…
1673		2054
1674	=item IO::AIO::fadvise $fh, $offset, $len, $advice	2055	=item IO::AIO::fadvise $fh, $offset, $len, $advice
1675		2056
1676	Simply calls the C<posix_fadvise> function (see its	2057	Simply calls the C<posix_fadvise> function (see its
1677	manpage for details). The following advice constants are	2058	manpage for details). The following advice constants are
1678	avaiable: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>,	2059	available: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>,
1679	C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>,	2060	C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>,
1680	C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>.	2061	C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>.
1681		2062
1682	On systems that do not implement C<posix_fadvise>, this function returns	2063	On systems that do not implement C<posix_fadvise>, this function returns
1683	ENOSYS, otherwise the return value of C<posix_fadvise>.	2064	ENOSYS, otherwise the return value of C<posix_fadvise>.
1684		2065
1685	=item IO::AIO::madvise $scalar, $offset, $len, $advice	2066	=item IO::AIO::madvise $scalar, $offset, $len, $advice
1686		2067
1687	Simply calls the C<posix_madvise> function (see its	2068	Simply calls the C<posix_madvise> function (see its
1688	manpage for details). The following advice constants are	2069	manpage for details). The following advice constants are
1689	avaiable: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>,	2070	available: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>,
1690	C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>.	2071	C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>,
		2072	C<IO::AIO::MADV_FREE>.
1691		2073
1692	On systems that do not implement C<posix_madvise>, this function returns	2074	On systems that do not implement C<posix_madvise>, this function returns
1693	ENOSYS, otherwise the return value of C<posix_madvise>.	2075	ENOSYS, otherwise the return value of C<posix_madvise>.
1694		2076
1695	=item IO::AIO::mprotect $scalar, $offset, $len, $protect	2077	=item IO::AIO::mprotect $scalar, $offset, $len, $protect
1696		2078
1697	Simply calls the C<mprotect> function on the preferably AIO::mmap'ed	2079	Simply calls the C<mprotect> function on the preferably AIO::mmap'ed
1698	$scalar (see its manpage for details). The following protect	2080	$scalar (see its manpage for details). The following protect
1699	constants are avaiable: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>,	2081	constants are available: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>,
1700	C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>.	2082	C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>.
1701		2083
1702	On systems that do not implement C<mprotect>, this function returns	2084	On systems that do not implement C<mprotect>, this function returns
1703	ENOSYS, otherwise the return value of C<mprotect>.	2085	ENOSYS, otherwise the return value of C<mprotect>.
1704		2086
1705	=item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset]	2087	=item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset]
1706		2088
1707	Memory-maps a file (or anonymous memory range) and attaches it to the	2089	Memory-maps a file (or anonymous memory range) and attaches it to the
1708	given C<$scalar>, which will act like a string scalar.	2090	given C<$scalar>, which will act like a string scalar. Returns true on
		2091	success, and false otherwise.
1709		2092
1710	The only operations allowed on the scalar are C<substr>/C<vec> that don't	2093	The only operations allowed on the scalar are C<substr>/C<vec> that don't
1711	change the string length, and most read-only operations such as copying it	2094	change the string length, and most read-only operations such as copying it
1712	or searching it with regexes and so on.	2095	or searching it with regexes and so on.
1713		2096
…		…
1724	filesize.	2107	filesize.
1725		2108
1726	C<$prot> is a combination of C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_EXEC>,	2109	C<$prot> is a combination of C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_EXEC>,
1727	C<IO::AIO::PROT_READ> and/or C<IO::AIO::PROT_WRITE>,	2110	C<IO::AIO::PROT_READ> and/or C<IO::AIO::PROT_WRITE>,
1728		2111
1729	C<$flags> can be a combination of C<IO::AIO::MAP_SHARED> or	2112	C<$flags> can be a combination of
1730	C<IO::AIO::MAP_PRIVATE>, or a number of system-specific flags (when	2113	C<IO::AIO::MAP_SHARED> or
1731	not available, the are defined as 0): C<IO::AIO::MAP_ANONYMOUS>	2114	C<IO::AIO::MAP_PRIVATE>,
		2115	or a number of system-specific flags (when not available, the are C<0>):
1732	(which is set to C<MAP_ANON> if your system only provides this	2116	C<IO::AIO::MAP_ANONYMOUS> (which is set to C<MAP_ANON> if your system only provides this constant),
1733	constant), C<IO::AIO::MAP_HUGETLB>, C<IO::AIO::MAP_LOCKED>,	2117	C<IO::AIO::MAP_LOCKED>,
1734	C<IO::AIO::MAP_NORESERVE>, C<IO::AIO::MAP_POPULATE> or	2118	C<IO::AIO::MAP_NORESERVE>,
		2119	C<IO::AIO::MAP_POPULATE>,
1735	C<IO::AIO::MAP_NONBLOCK>	2120	C<IO::AIO::MAP_NONBLOCK>,
		2121	C<IO::AIO::MAP_FIXED>,
		2122	C<IO::AIO::MAP_GROWSDOWN>,
		2123	C<IO::AIO::MAP_32BIT>,
		2124	C<IO::AIO::MAP_HUGETLB> or
		2125	C<IO::AIO::MAP_STACK>.
1736		2126
1737	If C<$fh> is C<undef>, then a file descriptor of C<-1> is passed.	2127	If C<$fh> is C<undef>, then a file descriptor of C<-1> is passed.
1738		2128
1739	C<$offset> is the offset from the start of the file - it generally must be	2129	C<$offset> is the offset from the start of the file - it generally must be
1740	a multiple of C<IO::AIO::PAGESIZE> and defaults to C<0>.	2130	a multiple of C<IO::AIO::PAGESIZE> and defaults to C<0>.
…		…
1765		2155
1766	Calls the C<munlockall> function.	2156	Calls the C<munlockall> function.
1767		2157
1768	On systems that do not implement C<munlockall>, this function returns	2158	On systems that do not implement C<munlockall>, this function returns
1769	ENOSYS, otherwise the return value of C<munlockall>.	2159	ENOSYS, otherwise the return value of C<munlockall>.
		2160
		2161	=item IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags
		2162
		2163	Calls the GNU/Linux C<splice(2)> syscall, if available. If C<$r_off> or
		2164	C<$w_off> are C<undef>, then C<NULL> is passed for these, otherwise they
		2165	should be the file offset.
		2166
		2167	C<$r_fh> and C<$w_fh> should not refer to the same file, as splice might
		2168	silently corrupt the data in this case.
		2169
		2170	The following symbol flag values are available: C<IO::AIO::SPLICE_F_MOVE>,
		2171	C<IO::AIO::SPLICE_F_NONBLOCK>, C<IO::AIO::SPLICE_F_MORE> and
		2172	C<IO::AIO::SPLICE_F_GIFT>.
		2173
		2174	See the C<splice(2)> manpage for details.
		2175
		2176	=item IO::AIO::tee $r_fh, $w_fh, $length, $flags
		2177
		2178	Calls the GNU/Linux C<tee(2)> syscall, see its manpage and the
		2179	description for C<IO::AIO::splice> above for details.
		2180
		2181	=item $actual_size = IO::AIO::pipesize $r_fh[, $new_size]
		2182
		2183	Attempts to query or change the pipe buffer size. Obviously works only
		2184	on pipes, and currently works only on GNU/Linux systems, and fails with
		2185	C<-1>/C<ENOSYS> everywhere else. If anybody knows how to influence pipe buffer
		2186	size on other systems, drop me a note.
		2187
		2188	=item ($rfh, $wfh) = IO::AIO::pipe2 [$flags]
		2189
		2190	This is a direct interface to the Linux L<pipe2(2)> system call. If
		2191	C<$flags> is missing or C<0>, then this should be the same as a call to
		2192	perl's built-in C<pipe> function and create a new pipe, and works on
		2193	systems that lack the pipe2 syscall. On win32, this case invokes C<_pipe
		2194	(..., 4096, O_BINARY)>.
		2195
		2196	If C<$flags> is non-zero, it tries to invoke the pipe2 system call with
		2197	the given flags (Linux 2.6.27, glibc 2.9).
		2198
		2199	On success, the read and write file handles are returned.
		2200
		2201	On error, nothing will be returned. If the pipe2 syscall is missing and
		2202	C<$flags> is non-zero, fails with C<ENOSYS>.
		2203
		2204	Please refer to L<pipe2(2)> for more info on the C<$flags>, but at the
		2205	time of this writing, C<IO::AIO::O_CLOEXEC>, C<IO::AIO::O_NONBLOCK> and
		2206	C<IO::AIO::O_DIRECT> (Linux 3.4, for packet-based pipes) were supported.
1770		2207
1771	=back	2208	=back
1772		2209
1773	=cut	2210	=cut
1774		2211
…		…
1829		2266
1830	=over 4	2267	=over 4
1831		2268
1832	=item IO::AIO::reinit	2269	=item IO::AIO::reinit
1833		2270
1834	Abondons all current requests and I/O threads and simply reinitialises all	2271	Abandons all current requests and I/O threads and simply reinitialises all
1835	data structures. This is not an operation suppported by any standards, but	2272	data structures. This is not an operation supported by any standards, but
1836	happens to work on GNU/Linux and some newer BSD systems.	2273	happens to work on GNU/Linux and some newer BSD systems.
1837		2274
1838	The only reasonable use for this function is to call it after forking, if	2275	The only reasonable use for this function is to call it after forking, if
1839	C<IO::AIO> was used in the parent. Calling it while IO::AIO is active in	2276	C<IO::AIO> was used in the parent. Calling it while IO::AIO is active in
1840	the process will result in undefined behaviour. Calling it at any time	2277	the process will result in undefined behaviour. Calling it at any time

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.206 by root, Sun Jul 24 03:32:51 2011 UTC vs. Revision 1.267 by root, Tue Aug 9 11:39:17 2016 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.206 by root, Sun Jul 24 03:32:51 2011 UTC vs.
Revision 1.267 by root, Tue Aug 9 11:39:17 2016 UTC