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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.202 by root, Tue Jul 5 14:02:15 2011 UTC vs.
Revision 1.229 by root, Wed Jul 25 16:32:30 2012 UTC

…		…
168	use common::sense;	168	use common::sense;
169		169
170	use base 'Exporter';	170	use base 'Exporter';
171		171
172	BEGIN {	172	BEGIN {
173	our $VERSION = '3.93';	173	our $VERSION = '4.15';
174		174
175	our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close	175	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	176	aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx
177	aio_scandir aio_symlink aio_readlink aio_realpath aio_sync aio_fsync	177	aio_scandir aio_symlink aio_readlink aio_realpath aio_sync
178	aio_fdatasync aio_sync_file_range aio_pathsync aio_readahead	178	aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range aio_fallocate
		179	aio_pathsync aio_readahead aio_fiemap
179	aio_rename aio_link aio_move aio_copy aio_group	180	aio_rename aio_link aio_move aio_copy aio_group
180	aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown	181	aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown
181	aio_chmod aio_utime aio_truncate	182	aio_chmod aio_utime aio_truncate
182	aio_msync aio_mtouch aio_mlock aio_mlockall	183	aio_msync aio_mtouch aio_mlock aio_mlockall
183	aio_statvfs);	184	aio_statvfs
		185	aio_wd);
184		186
185	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));	187	our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));
186	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush	188	our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
187	min_parallel max_parallel max_idle idle_timeout	189	min_parallel max_parallel max_idle idle_timeout
188	nreqs nready npending nthreads	190	nreqs nready npending nthreads
…		…
204		206
205	This section simply lists the prototypes of the most important functions	207	This section simply lists the prototypes of the most important functions
206	for quick reference. See the following sections for function-by-function	208	for quick reference. See the following sections for function-by-function
207	documentation.	209	documentation.
208		210
		211	aio_wd $pathname, $callback->($wd)
209	aio_open $pathname, $flags, $mode, $callback->($fh)	212	aio_open $pathname, $flags, $mode, $callback->($fh)
210	aio_close $fh, $callback->($status)	213	aio_close $fh, $callback->($status)
		214	aio_seek $fh,$offset,$whence, $callback->($offs)
211	aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)	215	aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
212	aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)	216	aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
213	aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)	217	aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval)
214	aio_readahead $fh,$offset,$length, $callback->($retval)	218	aio_readahead $fh,$offset,$length, $callback->($retval)
215	aio_stat $fh_or_path, $callback->($status)	219	aio_stat $fh_or_path, $callback->($status)
216	aio_lstat $fh, $callback->($status)	220	aio_lstat $fh, $callback->($status)
217	aio_statvfs $fh_or_path, $callback->($statvfs)	221	aio_statvfs $fh_or_path, $callback->($statvfs)
218	aio_utime $fh_or_path, $atime, $mtime, $callback->($status)	222	aio_utime $fh_or_path, $atime, $mtime, $callback->($status)
219	aio_chown $fh_or_path, $uid, $gid, $callback->($status)	223	aio_chown $fh_or_path, $uid, $gid, $callback->($status)
		224	aio_chmod $fh_or_path, $mode, $callback->($status)
220	aio_truncate $fh_or_path, $offset, $callback->($status)	225	aio_truncate $fh_or_path, $offset, $callback->($status)
221	aio_chmod $fh_or_path, $mode, $callback->($status)	226	aio_allocate $fh, $mode, $offset, $len, $callback->($status)
222	aio_unlink $pathname, $callback->($status)	227	aio_unlink $pathname, $callback->($status)
223	aio_mknod $path, $mode, $dev, $callback->($status)	228	aio_mknod $pathname, $mode, $dev, $callback->($status)
224	aio_link $srcpath, $dstpath, $callback->($status)	229	aio_link $srcpath, $dstpath, $callback->($status)
225	aio_symlink $srcpath, $dstpath, $callback->($status)	230	aio_symlink $srcpath, $dstpath, $callback->($status)
226	aio_readlink $path, $callback->($link)	231	aio_readlink $pathname, $callback->($link)
227	aio_realpath $path, $callback->($link)	232	aio_realpath $pathname, $callback->($link)
228	aio_rename $srcpath, $dstpath, $callback->($status)	233	aio_rename $srcpath, $dstpath, $callback->($status)
229	aio_mkdir $pathname, $mode, $callback->($status)	234	aio_mkdir $pathname, $mode, $callback->($status)
230	aio_rmdir $pathname, $callback->($status)	235	aio_rmdir $pathname, $callback->($status)
231	aio_readdir $pathname, $callback->($entries)	236	aio_readdir $pathname, $callback->($entries)
232	aio_readdirx $pathname, $flags, $callback->($entries, $flags)	237	aio_readdirx $pathname, $flags, $callback->($entries, $flags)
233	IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST	238	IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST
234	IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN	239	IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN
		240	aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs)
235	aio_load $path, $data, $callback->($status)	241	aio_load $pathname, $data, $callback->($status)
236	aio_copy $srcpath, $dstpath, $callback->($status)	242	aio_copy $srcpath, $dstpath, $callback->($status)
237	aio_move $srcpath, $dstpath, $callback->($status)	243	aio_move $srcpath, $dstpath, $callback->($status)
238	aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
239	aio_rmtree $path, $callback->($status)	244	aio_rmtree $pathname, $callback->($status)
240	aio_sync $callback->($status)	245	aio_sync $callback->($status)
		246	aio_syncfs $fh, $callback->($status)
241	aio_fsync $fh, $callback->($status)	247	aio_fsync $fh, $callback->($status)
242	aio_fdatasync $fh, $callback->($status)	248	aio_fdatasync $fh, $callback->($status)
243	aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status)	249	aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status)
244	aio_pathsync $path, $callback->($status)	250	aio_pathsync $pathname, $callback->($status)
245	aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status)	251	aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status)
246	aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status)	252	aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status)
247	aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status)	253	aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status)
248	aio_mlockall $flags, $callback->($status)	254	aio_mlockall $flags, $callback->($status)
249	aio_group $callback->(...)	255	aio_group $callback->(...)
…		…
267	IO::AIO::nready	273	IO::AIO::nready
268	IO::AIO::npending	274	IO::AIO::npending
269		275
270	IO::AIO::sendfile $ofh, $ifh, $offset, $count	276	IO::AIO::sendfile $ofh, $ifh, $offset, $count
271	IO::AIO::fadvise $fh, $offset, $len, $advice	277	IO::AIO::fadvise $fh, $offset, $len, $advice
		278	IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]]
		279	IO::AIO::munmap $scalar
272	IO::AIO::madvise $scalar, $offset, $length, $advice	280	IO::AIO::madvise $scalar, $offset, $length, $advice
273	IO::AIO::mprotect $scalar, $offset, $length, $protect	281	IO::AIO::mprotect $scalar, $offset, $length, $protect
274	IO::AIO::munlock $scalar, $offset = 0, $length = undef	282	IO::AIO::munlock $scalar, $offset = 0, $length = undef
275	IO::AIO::munlockall	283	IO::AIO::munlockall
276		284
277	=head2 AIO REQUEST FUNCTIONS	285	=head2 API NOTES
278		286
279	All the C<aio_*> calls are more or less thin wrappers around the syscall	287	All the C<aio_*> calls are more or less thin wrappers around the syscall
280	with the same name (sans C<aio_>). The arguments are similar or identical,	288	with the same name (sans C<aio_>). The arguments are similar or identical,
281	and they all accept an additional (and optional) C<$callback> argument	289	and they all accept an additional (and optional) C<$callback> argument
282	which must be a code reference. This code reference will get called with	290	which must be a code reference. This code reference will be called after
283	the syscall return code (e.g. most syscalls return C<-1> on error, unlike	291	the syscall has been executed in an asynchronous fashion. The results
284	perl, which usually delivers "false") as its sole argument after the given	292	of the request will be passed as arguments to the callback (and, if an
285	syscall has been executed asynchronously.	293	error occured, in C<$!>) - for most requests the syscall return code (e.g.
		294	most syscalls return C<-1> on error, unlike perl, which usually delivers
		295	"false").
		296
		297	Some requests (such as C<aio_readdir>) pass the actual results and
		298	communicate failures by passing C<undef>.
286		299
287	All functions expecting a filehandle keep a copy of the filehandle	300	All functions expecting a filehandle keep a copy of the filehandle
288	internally until the request has finished.	301	internally until the request has finished.
289		302
290	All functions return request objects of type L<IO::AIO::REQ> that allow	303	All functions return request objects of type L<IO::AIO::REQ> that allow
291	further manipulation of those requests while they are in-flight.	304	further manipulation of those requests while they are in-flight.
292		305
293	The pathnames you pass to these routines I<must> be absolute and	306	The pathnames you pass to these routines I<should> be absolute. The
294	encoded as octets. The reason for the former is that at the time the	307	reason for this is that at the time the request is being executed, the
295	request is being executed, the current working directory could have	308	current working directory could have changed. Alternatively, you can
296	changed. Alternatively, you can make sure that you never change the	309	make sure that you never change the current working directory anywhere
297	current working directory anywhere in the program and then use relative	310	in the program and then use relative paths. You can also take advantage
298	paths.	311	of IO::AIOs working directory abstraction, that lets you specify paths
		312	relative to some previously-opened "working directory object" - see the
		313	description of the C<IO::AIO::WD> class later in this document.
299		314
300	To encode pathnames as octets, either make sure you either: a) always pass	315	To encode pathnames as octets, either make sure you either: a) always pass
301	in filenames you got from outside (command line, readdir etc.) without	316	in filenames you got from outside (command line, readdir etc.) without
302	tinkering, b) are ASCII or ISO 8859-1, c) use the Encode module and encode	317	tinkering, b) are in your native filesystem encoding, c) use the Encode
303	your pathnames to the locale (or other) encoding in effect in the user	318	module and encode your pathnames to the locale (or other) encoding in
304	environment, d) use Glib::filename_from_unicode on unicode filenames or e)	319	effect in the user environment, d) use Glib::filename_from_unicode on
305	use something else to ensure your scalar has the correct contents.	320	unicode filenames or e) use something else to ensure your scalar has the
		321	correct contents.
306		322
307	This works, btw. independent of the internal UTF-8 bit, which IO::AIO	323	This works, btw. independent of the internal UTF-8 bit, which IO::AIO
308	handles correctly whether it is set or not.	324	handles correctly whether it is set or not.
		325
		326	=head2 AIO REQUEST FUNCTIONS
309		327
310	=over 4	328	=over 4
311		329
312	=item $prev_pri = aioreq_pri [$pri]	330	=item $prev_pri = aioreq_pri [$pri]
313		331
…		…
395		413
396	Or in other words: the file descriptor will be closed, but it will not be	414	Or in other words: the file descriptor will be closed, but it will not be
397	free for reuse until the perl filehandle is closed.	415	free for reuse until the perl filehandle is closed.
398		416
399	=cut	417	=cut
		418
		419	=item aio_seek $fh, $offset, $whence, $callback->($offs)
		420
		421	Seeks the filehandle to the new C<$offset>, similarly to perl's
		422	C<sysseek>. The C<$whence> can use the traditional values (C<0> for
		423	C<IO::AIO::SEEK_SET>, C<1> for C<IO::AIO::SEEK_CUR> or C<2> for
		424	C<IO::AIO::SEEK_END>).
		425
		426	The resulting absolute offset will be passed to the callback, or C<-1> in
		427	case of an error.
		428
		429	In theory, the C<$whence> constants could be different than the
		430	corresponding values from L<Fcntl>, but perl guarantees they are the same,
		431	so don't panic.
		432
		433	As a GNU/Linux (and maybe Solaris) extension, also the constants
		434	C<IO::AIO::SEEK_DATA> and C<IO::AIO::SEEK_HOLE> are available, if they
		435	could be found. No guarantees about suitability for use in C<aio_seek> or
		436	Perl's C<sysseek> can be made though, although I would naively assume they
		437	"just work".
400		438
401	=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)	439	=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
402		440
403	=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)	441	=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
404		442
…		…
601	=item aio_truncate $fh_or_path, $offset, $callback->($status)	639	=item aio_truncate $fh_or_path, $offset, $callback->($status)
602		640
603	Works like truncate(2) or ftruncate(2).	641	Works like truncate(2) or ftruncate(2).
604		642
605		643
		644	=item aio_allocate $fh, $mode, $offset, $len, $callback->($status)
		645
		646	Allocates or freed disk space according to the C<$mode> argument. See the
		647	linux C<fallocate> docuemntation for details.
		648
		649	C<$mode> can currently be C<0> or C<IO::AIO::FALLOC_FL_KEEP_SIZE>
		650	to allocate space, or C<IO::AIO::FALLOC_FL_PUNCH_HOLE \|
		651	IO::AIO::FALLOC_FL_KEEP_SIZE>, to deallocate a file range.
		652
		653	The file system block size used by C<fallocate> is presumably the
		654	C<f_bsize> returned by C<statvfs>.
		655
		656	If C<fallocate> isn't available or cannot be emulated (currently no
		657	emulation will be attempted), passes C<-1> and sets C<$!> to C<ENOSYS>.
		658
		659
606	=item aio_chmod $fh_or_path, $mode, $callback->($status)	660	=item aio_chmod $fh_or_path, $mode, $callback->($status)
607		661
608	Works like perl's C<chmod> function.	662	Works like perl's C<chmod> function.
609		663
610		664
…		…
612		666
613	Asynchronously unlink (delete) a file and call the callback with the	667	Asynchronously unlink (delete) a file and call the callback with the
614	result code.	668	result code.
615		669
616		670
617	=item aio_mknod $path, $mode, $dev, $callback->($status)	671	=item aio_mknod $pathname, $mode, $dev, $callback->($status)
618		672
619	[EXPERIMENTAL]	673	[EXPERIMENTAL]
620		674
621	Asynchronously create a device node (or fifo). See mknod(2).	675	Asynchronously create a device node (or fifo). See mknod(2).
622		676
623	The only (POSIX-) portable way of calling this function is:	677	The only (POSIX-) portable way of calling this function is:
624		678
625	aio_mknod $path, IO::AIO::S_IFIFO \| $mode, 0, sub { ...	679	aio_mknod $pathname, IO::AIO::S_IFIFO \| $mode, 0, sub { ...
626		680
627	See C<aio_stat> for info about some potentially helpful extra constants	681	See C<aio_stat> for info about some potentially helpful extra constants
628	and functions.	682	and functions.
629		683
630	=item aio_link $srcpath, $dstpath, $callback->($status)	684	=item aio_link $srcpath, $dstpath, $callback->($status)
…		…
637		691
638	Asynchronously create a new symbolic link to the existing object at C<$srcpath> at	692	Asynchronously create a new symbolic link to the existing object at C<$srcpath> at
639	the path C<$dstpath> and call the callback with the result code.	693	the path C<$dstpath> and call the callback with the result code.
640		694
641		695
642	=item aio_readlink $path, $callback->($link)	696	=item aio_readlink $pathname, $callback->($link)
643		697
644	Asynchronously read the symlink specified by C<$path> and pass it to	698	Asynchronously read the symlink specified by C<$path> and pass it to
645	the callback. If an error occurs, nothing or undef gets passed to the	699	the callback. If an error occurs, nothing or undef gets passed to the
646	callback.	700	callback.
647		701
648		702
649	=item aio_realpath $path, $callback->($path)	703	=item aio_realpath $pathname, $callback->($path)
650		704
651	Asynchronously make the path absolute and resolve any symlinks in	705	Asynchronously make the path absolute and resolve any symlinks in
652	C<$path>. The resulting path only consists of directories (Same as	706	C<$path>. The resulting path only consists of directories (Same as
653	L<Cwd::realpath>).	707	L<Cwd::realpath>).
654		708
…		…
685	array-ref with the filenames.	739	array-ref with the filenames.
686		740
687		741
688	=item aio_readdirx $pathname, $flags, $callback->($entries, $flags)	742	=item aio_readdirx $pathname, $flags, $callback->($entries, $flags)
689		743
690	Quite similar to C<aio_readdir>, but the C<$flags> argument allows to tune	744	Quite similar to C<aio_readdir>, but the C<$flags> argument allows one to
691	behaviour and output format. In case of an error, C<$entries> will be	745	tune behaviour and output format. In case of an error, C<$entries> will be
692	C<undef>.	746	C<undef>.
693		747
694	The flags are a combination of the following constants, ORed together (the	748	The flags are a combination of the following constants, ORed together (the
695	flags will also be passed to the callback, possibly modified):	749	flags will also be passed to the callback, possibly modified):
696		750
…		…
743		797
744	=item IO::AIO::READDIR_FOUND_UNKNOWN	798	=item IO::AIO::READDIR_FOUND_UNKNOWN
745		799
746	This flag should not be set when calling C<aio_readdirx>. Instead, it	800	This flag should not be set when calling C<aio_readdirx>. Instead, it
747	is being set by C<aio_readdirx>, when any of the C<$type>'s found were	801	is being set by C<aio_readdirx>, when any of the C<$type>'s found were
748	C<IO::AIO::DT_UNKNOWN>. The absense of this flag therefore indicates that all	802	C<IO::AIO::DT_UNKNOWN>. The absence of this flag therefore indicates that all
749	C<$type>'s are known, which can be used to speed up some algorithms.	803	C<$type>'s are known, which can be used to speed up some algorithms.
750		804
751	=back	805	=back
752		806
753		807
754	=item aio_load $path, $data, $callback->($status)	808	=item aio_load $pathname, $data, $callback->($status)
755		809
756	This is a composite request that tries to fully load the given file into	810	This is a composite request that tries to fully load the given file into
757	memory. Status is the same as with aio_read.	811	memory. Status is the same as with aio_read.
758		812
759	=cut	813	=cut
…		…
894	};	948	};
895		949
896	$grp	950	$grp
897	}	951	}
898		952
899	=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)	953	=item aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs)
900		954
901	Scans a directory (similar to C<aio_readdir>) but additionally tries to	955	Scans a directory (similar to C<aio_readdir>) but additionally tries to
902	efficiently separate the entries of directory C<$path> into two sets of	956	efficiently separate the entries of directory C<$path> into two sets of
903	names, directories you can recurse into (directories), and ones you cannot	957	names, directories you can recurse into (directories), and ones you cannot
904	recurse into (everything else, including symlinks to directories).	958	recurse into (everything else, including symlinks to directories).
…		…
935	Then entries will be sorted into likely directories a non-initial dot	989	Then entries will be sorted into likely directories a non-initial dot
936	currently) and likely non-directories (see C<aio_readdirx>). Then every	990	currently) and likely non-directories (see C<aio_readdirx>). Then every
937	entry plus an appended C</.> will be C<stat>'ed, likely directories first,	991	entry plus an appended C</.> will be C<stat>'ed, likely directories first,
938	in order of their inode numbers. If that succeeds, it assumes that the	992	in order of their inode numbers. If that succeeds, it assumes that the
939	entry is a directory or a symlink to directory (which will be checked	993	entry is a directory or a symlink to directory (which will be checked
940	seperately). This is often faster than stat'ing the entry itself because	994	separately). This is often faster than stat'ing the entry itself because
941	filesystems might detect the type of the entry without reading the inode	995	filesystems might detect the type of the entry without reading the inode
942	data (e.g. ext2fs filetype feature), even on systems that cannot return	996	data (e.g. ext2fs filetype feature), even on systems that cannot return
943	the filetype information on readdir.	997	the filetype information on readdir.
944		998
945	If the known number of directories (link count - 2) has been reached, the	999	If the known number of directories (link count - 2) has been reached, the
…		…
961		1015
962	my $grp = aio_group $cb;	1016	my $grp = aio_group $cb;
963		1017
964	$maxreq = 4 if $maxreq <= 0;	1018	$maxreq = 4 if $maxreq <= 0;
965		1019
966	# stat once	1020	# get a wd object
967	aioreq_pri $pri;	1021	aioreq_pri $pri;
968	add $grp aio_stat $path, sub {	1022	add $grp aio_wd $path, sub {
		1023	$_[0]
969	return $grp->result () if $_[0];	1024	or return $grp->result ();
970	my $now = time;
971	my $hash1 = join ":", (stat _)[0,1,3,7,9];
972		1025
973	# read the directory entries	1026	my $wd = [shift, "."];
		1027
		1028	# stat once
974	aioreq_pri $pri;	1029	aioreq_pri $pri;
975	add $grp aio_readdirx $path, READDIR_DIRS_FIRST, sub {	1030	add $grp aio_stat $wd, sub {
976	my $entries = shift
977	or return $grp->result ();	1031	return $grp->result () if $_[0];
		1032	my $now = time;
		1033	my $hash1 = join ":", (stat _)[0,1,3,7,9];
978		1034
979	# stat the dir another time	1035	# read the directory entries
980	aioreq_pri $pri;	1036	aioreq_pri $pri;
		1037	add $grp aio_readdirx $wd, READDIR_DIRS_FIRST, sub {
		1038	my $entries = shift
		1039	or return $grp->result ();
		1040
		1041	# stat the dir another time
		1042	aioreq_pri $pri;
981	add $grp aio_stat $path, sub {	1043	add $grp aio_stat $wd, sub {
982	my $hash2 = join ":", (stat _)[0,1,3,7,9];	1044	my $hash2 = join ":", (stat _)[0,1,3,7,9];
983		1045
984	my $ndirs;	1046	my $ndirs;
985		1047
986	# take the slow route if anything looks fishy	1048	# take the slow route if anything looks fishy
987	if ($hash1 ne $hash2 or (stat _)[9] == $now) {	1049	if ($hash1 ne $hash2 or (stat _)[9] == $now) {
988	$ndirs = -1;	1050	$ndirs = -1;
989	} else {	1051	} else {
990	# if nlink == 2, we are finished	1052	# if nlink == 2, we are finished
991	# for non-posix-fs's, we rely on nlink < 2	1053	# for non-posix-fs's, we rely on nlink < 2
992	$ndirs = (stat _)[3] - 2	1054	$ndirs = (stat _)[3] - 2
993	or return $grp->result ([], $entries);	1055	or return $grp->result ([], $entries);
994	}	1056	}
995		1057
996	my (@dirs, @nondirs);	1058	my (@dirs, @nondirs);
997		1059
998	my $statgrp = add $grp aio_group sub {	1060	my $statgrp = add $grp aio_group sub {
999	$grp->result (\@dirs, \@nondirs);	1061	$grp->result (\@dirs, \@nondirs);
1000	};	1062	};
1001		1063
1002	limit $statgrp $maxreq;	1064	limit $statgrp $maxreq;
1003	feed $statgrp sub {	1065	feed $statgrp sub {
1004	return unless @$entries;	1066	return unless @$entries;
1005	my $entry = shift @$entries;	1067	my $entry = shift @$entries;
1006		1068
1007	aioreq_pri $pri;	1069	aioreq_pri $pri;
		1070	$wd->[1] = "$entry/.";
1008	add $statgrp aio_stat "$path/$entry/.", sub {	1071	add $statgrp aio_stat $wd, sub {
1009	if ($_[0] < 0) {	1072	if ($_[0] < 0) {
1010	push @nondirs, $entry;	1073	push @nondirs, $entry;
1011	} else {	1074	} else {
1012	# need to check for real directory	1075	# need to check for real directory
1013	aioreq_pri $pri;	1076	aioreq_pri $pri;
		1077	$wd->[1] = $entry;
1014	add $statgrp aio_lstat "$path/$entry", sub {	1078	add $statgrp aio_lstat $wd, sub {
1015	if (-d _) {	1079	if (-d _) {
1016	push @dirs, $entry;	1080	push @dirs, $entry;
1017		1081
1018	unless (--$ndirs) {	1082	unless (--$ndirs) {
1019	push @nondirs, @$entries;	1083	push @nondirs, @$entries;
1020	feed $statgrp;	1084	feed $statgrp;
		1085	}
		1086	} else {
		1087	push @nondirs, $entry;
1021	}	1088	}
1022	} else {
1023	push @nondirs, $entry;
1024	}	1089	}
1025	}	1090	}
1026	}	1091	};
1027	};	1092	};
1028	};	1093	};
1029	};	1094	};
1030	};	1095	};
1031	};	1096	};
1032		1097
1033	$grp	1098	$grp
1034	}	1099	}
1035		1100
1036	=item aio_rmtree $path, $callback->($status)	1101	=item aio_rmtree $pathname, $callback->($status)
1037		1102
1038	Delete a directory tree starting (and including) C<$path>, return the	1103	Delete a directory tree starting (and including) C<$path>, return the
1039	status of the final C<rmdir> only. This is a composite request that	1104	status of the final C<rmdir> only. This is a composite request that
1040	uses C<aio_scandir> to recurse into and rmdir directories, and unlink	1105	uses C<aio_scandir> to recurse into and rmdir directories, and unlink
1041	everything else.	1106	everything else.
…		…
1083	callback with the fdatasync result code.	1148	callback with the fdatasync result code.
1084		1149
1085	If this call isn't available because your OS lacks it or it couldn't be	1150	If this call isn't available because your OS lacks it or it couldn't be
1086	detected, it will be emulated by calling C<fsync> instead.	1151	detected, it will be emulated by calling C<fsync> instead.
1087		1152
		1153	=item aio_syncfs $fh, $callback->($status)
		1154
		1155	Asynchronously call the syncfs syscall to sync the filesystem associated
		1156	to the given filehandle and call the callback with the syncfs result
		1157	code. If syncfs is not available, calls sync(), but returns C<-1> and sets
		1158	errno to C<ENOSYS> nevertheless.
		1159
1088	=item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status)	1160	=item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status)
1089		1161
1090	Sync the data portion of the file specified by C<$offset> and C<$length>	1162	Sync the data portion of the file specified by C<$offset> and C<$length>
1091	to disk (but NOT the metadata), by calling the Linux-specific	1163	to disk (but NOT the metadata), by calling the Linux-specific
1092	sync_file_range call. If sync_file_range is not available or it returns	1164	sync_file_range call. If sync_file_range is not available or it returns
…		…
1095	C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>,	1167	C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>,
1096	C<IO::AIO::SYNC_FILE_RANGE_WRITE> and	1168	C<IO::AIO::SYNC_FILE_RANGE_WRITE> and
1097	C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range	1169	C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range
1098	manpage for details.	1170	manpage for details.
1099		1171
1100	=item aio_pathsync $path, $callback->($status)	1172	=item aio_pathsync $pathname, $callback->($status)
1101		1173
1102	This request tries to open, fsync and close the given path. This is a	1174	This request tries to open, fsync and close the given path. This is a
1103	composite request intended to sync directories after directory operations	1175	composite request intended to sync directories after directory operations
1104	(E.g. rename). This might not work on all operating systems or have any	1176	(E.g. rename). This might not work on all operating systems or have any
1105	specific effect, but usually it makes sure that directory changes get	1177	specific effect, but usually it makes sure that directory changes get
…		…
1202		1274
1203	Example: asynchronously lock all current and future pages into memory.	1275	Example: asynchronously lock all current and future pages into memory.
1204		1276
1205	aio_mlockall IO::AIO::MCL_FUTURE;	1277	aio_mlockall IO::AIO::MCL_FUTURE;
1206		1278
		1279	=item aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents)
		1280
		1281	Queries the extents of the given file (by calling the Linux FIEMAP ioctl,
		1282	see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If the
		1283	C<ioctl> is not available on your OS, then this rquiest will fail with
		1284	C<ENOSYS>.
		1285
		1286	C<$start> is the starting offset to query extents for, C<$length> is the
		1287	size of the range to query - if it is C<undef>, then the whole file will
		1288	be queried.
		1289
		1290	C<$flags> is a combination of flags (C<IO::AIO::FIEMAP_FLAG_SYNC> or
		1291	C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also
		1292	exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query
		1293	the data portion.
		1294
		1295	C<$count> is the maximum number of extent records to return. If it is
		1296	C<undef>, then IO::AIO queries all extents of the file. As a very special
		1297	case, if it is C<0>, then the callback receives the number of extents
		1298	instead of the extents themselves.
		1299
		1300	If an error occurs, the callback receives no arguments. The special
		1301	C<errno> value C<IO::AIO::EBADR> is available to test for flag errors.
		1302
		1303	Otherwise, the callback receives an array reference with extent
		1304	structures. Each extent structure is an array reference itself, with the
		1305	following members:
		1306
		1307	[$logical, $physical, $length, $flags]
		1308
		1309	Flags is any combination of the following flag values (typically either C<0>
		1310	or C<IO::AIO::FIEMAP_EXTENT_LAST>):
		1311
		1312	C<IO::AIO::FIEMAP_EXTENT_LAST>, C<IO::AIO::FIEMAP_EXTENT_UNKNOWN>,
		1313	C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>,
		1314	C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>,
		1315	C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>,
		1316	C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or
		1317	C<IO::AIO::FIEMAP_EXTENT_SHARED>.
		1318
1207	=item aio_group $callback->(...)	1319	=item aio_group $callback->(...)
1208		1320
1209	This is a very special aio request: Instead of doing something, it is a	1321	This is a very special aio request: Instead of doing something, it is a
1210	container for other aio requests, which is useful if you want to bundle	1322	container for other aio requests, which is useful if you want to bundle
1211	many requests into a single, composite, request with a definite callback	1323	many requests into a single, composite, request with a definite callback
…		…
1247	like sleep and file handle readable/writable, the overhead this creates is	1359	like sleep and file handle readable/writable, the overhead this creates is
1248	immense (it blocks a thread for a long time) so do not use this function	1360	immense (it blocks a thread for a long time) so do not use this function
1249	except to put your application under artificial I/O pressure.	1361	except to put your application under artificial I/O pressure.
1250		1362
1251	=back	1363	=back
		1364
		1365
		1366	=head2 IO::AIO::WD - multiple working directories
		1367
		1368	Your process only has one current working directory, which is used by all
		1369	threads. This makes it hard to use relative paths (some other component
		1370	could call C<chdir> at any time, and it is hard to control when the path
		1371	will be used by IO::AIO).
		1372
		1373	One solution for this is to always use absolute paths. This usually works,
		1374	but can be quite slow (the kernel has to walk the whole path on every
		1375	access), and can also be a hassle to implement.
		1376
		1377	Newer POSIX systems have a number of functions (openat, fdopendir,
		1378	futimensat and so on) that make it possible to specify working directories
		1379	per operation.
		1380
		1381	For portability, and because the clowns who "designed", or shall I write,
		1382	perpetrated this new interface were obviously half-drunk, this abstraction
		1383	cannot be perfect, though.
		1384
		1385	IO::AIO allows you to convert directory paths into a so-called IO::AIO::WD
		1386	object. This object stores the canonicalised, absolute version of the
		1387	path, and on systems that allow it, also a directory file descriptor.
		1388
		1389	Everywhere where a pathname is accepted by IO::AIO (e.g. in C<aio_stat>
		1390	or C<aio_unlink>), one can specify an array reference with an IO::AIO::WD
		1391	object and a pathname instead (or the IO::AIO::WD object alone, which
		1392	gets interpreted as C<[$wd, "."]>). If the pathname is absolute, the
		1393	IO::AIO::WD object is ignored, otherwise the pathname is resolved relative
		1394	to that IO::AIO::WD object.
		1395
		1396	For example, to get a wd object for F</etc> and then stat F<passwd>
		1397	inside, you would write:
		1398
		1399	aio_wd "/etc", sub {
		1400	my $etcdir = shift;
		1401
		1402	# although $etcdir can be undef on error, there is generally no reason
		1403	# to check for errors here, as aio_stat will fail with ENOENT
		1404	# when $etcdir is undef.
		1405
		1406	aio_stat [$etcdir, "passwd"], sub {
		1407	# yay
		1408	};
		1409	};
		1410
		1411	That C<aio_wd> is a request and not a normal function shows that creating
		1412	an IO::AIO::WD object is itself a potentially blocking operation, which is
		1413	why it is done asynchronously.
		1414
		1415	To stat the directory obtained with C<aio_wd> above, one could write
		1416	either of the following three request calls:
		1417
		1418	aio_lstat "/etc" , sub { ... # pathname as normal string
		1419	aio_lstat [$wd, "."], sub { ... # "." relative to $wd (i.e. $wd itself)
		1420	aio_lstat $wd , sub { ... # shorthand for the previous
		1421
		1422	As with normal pathnames, IO::AIO keeps a copy of the working directory
		1423	object and the pathname string, so you could write the following without
		1424	causing any issues due to C<$path> getting reused:
		1425
		1426	my $path = [$wd, undef];
		1427
		1428	for my $name (qw(abc def ghi)) {
		1429	$path->[1] = $name;
		1430	aio_stat $path, sub {
		1431	# ...
		1432	};
		1433	}
		1434
		1435	There are some caveats: when directories get renamed (or deleted), the
		1436	pathname string doesn't change, so will point to the new directory (or
		1437	nowhere at all), while the directory fd, if available on the system,
		1438	will still point to the original directory. Most functions accepting a
		1439	pathname will use the directory fd on newer systems, and the string on
		1440	older systems. Some functions (such as realpath) will always rely on the
		1441	string form of the pathname.
		1442
		1443	So this fucntionality is mainly useful to get some protection against
		1444	C<chdir>, to easily get an absolute path out of a relative path for future
		1445	reference, and to speed up doing many operations in the same directory
		1446	(e.g. when stat'ing all files in a directory).
		1447
		1448	The following functions implement this working directory abstraction:
		1449
		1450	=over 4
		1451
		1452	=item aio_wd $pathname, $callback->($wd)
		1453
		1454	Asynchonously canonicalise the given pathname and convert it to an
		1455	IO::AIO::WD object representing it. If possible and supported on the
		1456	system, also open a directory fd to speed up pathname resolution relative
		1457	to this working directory.
		1458
		1459	If something goes wrong, then C<undef> is passwd to the callback instead
		1460	of a working directory object and C<$!> is set appropriately. Since
		1461	passing C<undef> as working directory component of a pathname fails the
		1462	request with C<ENOENT>, there is often no need for error checking in the
		1463	C<aio_wd> callback, as future requests using the value will fail in the
		1464	expected way.
		1465
		1466	If this call isn't available because your OS lacks it or it couldn't be
		1467	detected, it will be emulated by calling C<fsync> instead.
		1468
		1469	=item IO::AIO::CWD
		1470
		1471	This is a compiletime constant (object) that represents the process
		1472	current working directory.
		1473
		1474	Specifying this object as working directory object for a pathname is as
		1475	if the pathname would be specified directly, without a directory object,
		1476	e.g., these calls are functionally identical:
		1477
		1478	aio_stat "somefile", sub { ... };
		1479	aio_stat [IO::AIO::CWD, "somefile"], sub { ... };
		1480
		1481	=back
		1482
1252		1483
1253	=head2 IO::AIO::REQ CLASS	1484	=head2 IO::AIO::REQ CLASS
1254		1485
1255	All non-aggregate C<aio_*> functions return an object of this class when	1486	All non-aggregate C<aio_*> functions return an object of this class when
1256	called in non-void context.	1487	called in non-void context.
…		…
1374		1605
1375	Sets a feeder/generator on this group: every group can have an attached	1606	Sets a feeder/generator on this group: every group can have an attached
1376	generator that generates requests if idle. The idea behind this is that,	1607	generator that generates requests if idle. The idea behind this is that,
1377	although you could just queue as many requests as you want in a group,	1608	although you could just queue as many requests as you want in a group,
1378	this might starve other requests for a potentially long time. For example,	1609	this might starve other requests for a potentially long time. For example,
1379	C<aio_scandir> might generate hundreds of thousands C<aio_stat> requests,	1610	C<aio_scandir> might generate hundreds of thousands of C<aio_stat>
1380	delaying any later requests for a long time.	1611	requests, delaying any later requests for a long time.
1381		1612
1382	To avoid this, and allow incremental generation of requests, you can	1613	To avoid this, and allow incremental generation of requests, you can
1383	instead a group and set a feeder on it that generates those requests. The	1614	instead a group and set a feeder on it that generates those requests. The
1384	feed callback will be called whenever there are few enough (see C<limit>,	1615	feed callback will be called whenever there are few enough (see C<limit>,
1385	below) requests active in the group itself and is expected to queue more	1616	below) requests active in the group itself and is expected to queue more
…		…
1664		1895
1665	=item IO::AIO::fadvise $fh, $offset, $len, $advice	1896	=item IO::AIO::fadvise $fh, $offset, $len, $advice
1666		1897
1667	Simply calls the C<posix_fadvise> function (see its	1898	Simply calls the C<posix_fadvise> function (see its
1668	manpage for details). The following advice constants are	1899	manpage for details). The following advice constants are
1669	avaiable: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>,	1900	available: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>,
1670	C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>,	1901	C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>,
1671	C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>.	1902	C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>.
1672		1903
1673	On systems that do not implement C<posix_fadvise>, this function returns	1904	On systems that do not implement C<posix_fadvise>, this function returns
1674	ENOSYS, otherwise the return value of C<posix_fadvise>.	1905	ENOSYS, otherwise the return value of C<posix_fadvise>.
1675		1906
1676	=item IO::AIO::madvise $scalar, $offset, $len, $advice	1907	=item IO::AIO::madvise $scalar, $offset, $len, $advice
1677		1908
1678	Simply calls the C<posix_madvise> function (see its	1909	Simply calls the C<posix_madvise> function (see its
1679	manpage for details). The following advice constants are	1910	manpage for details). The following advice constants are
1680	avaiable: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>,	1911	available: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>,
1681	C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>.	1912	C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>.
1682		1913
1683	On systems that do not implement C<posix_madvise>, this function returns	1914	On systems that do not implement C<posix_madvise>, this function returns
1684	ENOSYS, otherwise the return value of C<posix_madvise>.	1915	ENOSYS, otherwise the return value of C<posix_madvise>.
1685		1916
1686	=item IO::AIO::mprotect $scalar, $offset, $len, $protect	1917	=item IO::AIO::mprotect $scalar, $offset, $len, $protect
1687		1918
1688	Simply calls the C<mprotect> function on the preferably AIO::mmap'ed	1919	Simply calls the C<mprotect> function on the preferably AIO::mmap'ed
1689	$scalar (see its manpage for details). The following protect	1920	$scalar (see its manpage for details). The following protect
1690	constants are avaiable: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>,	1921	constants are available: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>,
1691	C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>.	1922	C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>.
1692		1923
1693	On systems that do not implement C<mprotect>, this function returns	1924	On systems that do not implement C<mprotect>, this function returns
1694	ENOSYS, otherwise the return value of C<mprotect>.	1925	ENOSYS, otherwise the return value of C<mprotect>.
1695		1926
1696	=item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset]	1927	=item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset]
1697		1928
1698	Memory-maps a file (or anonymous memory range) and attaches it to the	1929	Memory-maps a file (or anonymous memory range) and attaches it to the
1699	given C<$scalar>, which will act like a string scalar.	1930	given C<$scalar>, which will act like a string scalar. Returns true on
		1931	success, and false otherwise.
1700		1932
1701	The only operations allowed on the scalar are C<substr>/C<vec> that don't	1933	The only operations allowed on the scalar are C<substr>/C<vec> that don't
1702	change the string length, and most read-only operations such as copying it	1934	change the string length, and most read-only operations such as copying it
1703	or searching it with regexes and so on.	1935	or searching it with regexes and so on.
1704		1936
…		…
1757	Calls the C<munlockall> function.	1989	Calls the C<munlockall> function.
1758		1990
1759	On systems that do not implement C<munlockall>, this function returns	1991	On systems that do not implement C<munlockall>, this function returns
1760	ENOSYS, otherwise the return value of C<munlockall>.	1992	ENOSYS, otherwise the return value of C<munlockall>.
1761		1993
		1994	=item IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags
		1995
		1996	Calls the GNU/Linux C<splice(2)> syscall, if available. If C<$r_off> or
		1997	C<$w_off> are C<undef>, then C<NULL> is passed for these, otherwise they
		1998	should be the file offset.
		1999
		2000	C<$r_fh> and C<$w_fh> should not refer to the same file, as splice might
		2001	silently corrupt the data in this case.
		2002
		2003	The following symbol flag values are available: C<IO::AIO::SPLICE_F_MOVE>,
		2004	C<IO::AIO::SPLICE_F_NONBLOCK>, C<IO::AIO::SPLICE_F_MORE> and
		2005	C<IO::AIO::SPLICE_F_GIFT>.
		2006
		2007	See the C<splice(2)> manpage for details.
		2008
		2009	=item IO::AIO::tee $r_fh, $w_fh, $length, $flags
		2010
		2011	Calls the GNU/Linux C<tee(2)> syscall, see it's manpage and the
		2012	description for C<IO::AIO::splice> above for details.
		2013
1762	=back	2014	=back
1763		2015
1764	=cut	2016	=cut
1765		2017
1766	min_parallel 8;	2018	min_parallel 8;
…		…
1803	=head2 FORK BEHAVIOUR	2055	=head2 FORK BEHAVIOUR
1804		2056
1805	Usage of pthreads in a program changes the semantics of fork	2057	Usage of pthreads in a program changes the semantics of fork
1806	considerably. Specifically, only async-safe functions can be called after	2058	considerably. Specifically, only async-safe functions can be called after
1807	fork. Perl doesn't know about this, so in general, you cannot call fork	2059	fork. Perl doesn't know about this, so in general, you cannot call fork
1808	with defined behaviour in perl. IO::AIO uses pthreads, so this applies,	2060	with defined behaviour in perl if pthreads are involved. IO::AIO uses
1809	but many other extensions and (for inexplicable reasons) perl itself often	2061	pthreads, so this applies, but many other extensions and (for inexplicable
1810	is linked against pthreads, so this limitation applies.	2062	reasons) perl itself often is linked against pthreads, so this limitation
		2063	applies to quite a lot of perls.
1811		2064
1812	Some operating systems have extensions that allow safe use of fork, and	2065	This module no longer tries to fight your OS, or POSIX. That means IO::AIO
1813	this module should do "the right thing" on those, and tries on others. At	2066	only works in the process that loaded it. Forking is fully supported, but
1814	the time of this writing (2011) only GNU/Linux supports these extensions	2067	using IO::AIO in the child is not.
1815	to POSIX.	2068
		2069	You might get around by not I<using> IO::AIO before (or after)
		2070	forking. You could also try to call the L<IO::AIO::reinit> function in the
		2071	child:
		2072
		2073	=over 4
		2074
		2075	=item IO::AIO::reinit
		2076
		2077	Abandons all current requests and I/O threads and simply reinitialises all
		2078	data structures. This is not an operation supported by any standards, but
		2079	happens to work on GNU/Linux and some newer BSD systems.
		2080
		2081	The only reasonable use for this function is to call it after forking, if
		2082	C<IO::AIO> was used in the parent. Calling it while IO::AIO is active in
		2083	the process will result in undefined behaviour. Calling it at any time
		2084	will also result in any undefined (by POSIX) behaviour.
		2085
		2086	=back
1816		2087
1817	=head2 MEMORY USAGE	2088	=head2 MEMORY USAGE
1818		2089
1819	Per-request usage:	2090	Per-request usage:
1820		2091

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.202 by root, Tue Jul 5 14:02:15 2011 UTC vs. Revision 1.229 by root, Wed Jul 25 16:32:30 2012 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.202 by root, Tue Jul 5 14:02:15 2011 UTC vs.
Revision 1.229 by root, Wed Jul 25 16:32:30 2012 UTC