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

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.228 by root, Sun Jun 17 17:07:25 2012 UTC vs.
Revision 1.255 by root, Thu Jun 25 15:20:11 2015 UTC

…		…
68	=head2 EXAMPLE	68	=head2 EXAMPLE
69		69
70	This is a simple example that uses the EV module and loads	70	This is a simple example that uses the EV module and loads
71	F</etc/passwd> asynchronously:	71	F</etc/passwd> asynchronously:
72		72
73	use Fcntl;
74	use EV;	73	use EV;
75	use IO::AIO;	74	use IO::AIO;
76		75
77	# register the IO::AIO callback with EV	76	# register the IO::AIO callback with EV
78	my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb;	77	my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb;
…		…
168	use common::sense;	167	use common::sense;
169		168
170	use base 'Exporter';	169	use base 'Exporter';
171		170
172	BEGIN {	171	BEGIN {
173	our $VERSION = '4.15';	172	our $VERSION = 4.32;
174		173
175	our @AIO_REQ = qw(aio_sendfile aio_seek aio_read aio_write aio_open aio_close	174	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	175	aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx
177	aio_scandir aio_symlink aio_readlink aio_realpath aio_sync	176	aio_scandir aio_symlink aio_readlink aio_realpath aio_sync
178	aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range aio_fallocate	177	aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range aio_allocate
179	aio_pathsync aio_readahead aio_fiemap	178	aio_pathsync aio_readahead aio_fiemap
180	aio_rename aio_link aio_move aio_copy aio_group	179	aio_rename aio_link aio_move aio_copy aio_group
181	aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown	180	aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown
182	aio_chmod aio_utime aio_truncate	181	aio_chmod aio_utime aio_truncate
183	aio_msync aio_mtouch aio_mlock aio_mlockall	182	aio_msync aio_mtouch aio_mlock aio_mlockall
…		…
202		201
203	=head1 FUNCTIONS	202	=head1 FUNCTIONS
204		203
205	=head2 QUICK OVERVIEW	204	=head2 QUICK OVERVIEW
206		205
207	This section simply lists the prototypes of the most important functions	206	This section simply lists the prototypes most of the functions for
208	for quick reference. See the following sections for function-by-function	207	quick reference. See the following sections for function-by-function
209	documentation.	208	documentation.
210		209
211	aio_wd $pathname, $callback->($wd)	210	aio_wd $pathname, $callback->($wd)
212	aio_open $pathname, $flags, $mode, $callback->($fh)	211	aio_open $pathname, $flags, $mode, $callback->($fh)
213	aio_close $fh, $callback->($status)	212	aio_close $fh, $callback->($status)
…		…
221	aio_statvfs $fh_or_path, $callback->($statvfs)	220	aio_statvfs $fh_or_path, $callback->($statvfs)
222	aio_utime $fh_or_path, $atime, $mtime, $callback->($status)	221	aio_utime $fh_or_path, $atime, $mtime, $callback->($status)
223	aio_chown $fh_or_path, $uid, $gid, $callback->($status)	222	aio_chown $fh_or_path, $uid, $gid, $callback->($status)
224	aio_chmod $fh_or_path, $mode, $callback->($status)	223	aio_chmod $fh_or_path, $mode, $callback->($status)
225	aio_truncate $fh_or_path, $offset, $callback->($status)	224	aio_truncate $fh_or_path, $offset, $callback->($status)
		225	aio_allocate $fh, $mode, $offset, $len, $callback->($status)
		226	aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents)
226	aio_unlink $pathname, $callback->($status)	227	aio_unlink $pathname, $callback->($status)
227	aio_mknod $pathname, $mode, $dev, $callback->($status)	228	aio_mknod $pathname, $mode, $dev, $callback->($status)
228	aio_link $srcpath, $dstpath, $callback->($status)	229	aio_link $srcpath, $dstpath, $callback->($status)
229	aio_symlink $srcpath, $dstpath, $callback->($status)	230	aio_symlink $srcpath, $dstpath, $callback->($status)
230	aio_readlink $pathname, $callback->($link)	231	aio_readlink $pathname, $callback->($link)
231	aio_realpath $pathname, $callback->($link)	232	aio_realpath $pathname, $callback->($path)
232	aio_rename $srcpath, $dstpath, $callback->($status)	233	aio_rename $srcpath, $dstpath, $callback->($status)
233	aio_mkdir $pathname, $mode, $callback->($status)	234	aio_mkdir $pathname, $mode, $callback->($status)
234	aio_rmdir $pathname, $callback->($status)	235	aio_rmdir $pathname, $callback->($status)
235	aio_readdir $pathname, $callback->($entries)	236	aio_readdir $pathname, $callback->($entries)
236	aio_readdirx $pathname, $flags, $callback->($entries, $flags)	237	aio_readdirx $pathname, $flags, $callback->($entries, $flags)
…		…
360		361
361		362
362	=item aio_open $pathname, $flags, $mode, $callback->($fh)	363	=item aio_open $pathname, $flags, $mode, $callback->($fh)
363		364
364	Asynchronously open or create a file and call the callback with a newly	365	Asynchronously open or create a file and call the callback with a newly
365	created filehandle for the file.	366	created filehandle for the file (or C<undef> in case of an error).
366		367
367	The pathname passed to C<aio_open> must be absolute. See API NOTES, above,	368	The pathname passed to C<aio_open> must be absolute. See API NOTES, above,
368	for an explanation.	369	for an explanation.
369		370
370	The C<$flags> argument is a bitmask. See the C<Fcntl> module for a	371	The C<$flags> argument is a bitmask. See the C<Fcntl> module for a
…		…
393	following POSIX and non-POSIX constants are available (missing ones on	394	following POSIX and non-POSIX constants are available (missing ones on
394	your system are, as usual, C<0>):	395	your system are, as usual, C<0>):
395		396
396	C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>,	397	C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>,
397	C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>,	398	C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>,
398	C<O_RSYNC>, C<O_SYNC> and C<O_TTY_INIT>.	399	C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, and C<O_TTY_INIT>.
399		400
400		401
401	=item aio_close $fh, $callback->($status)	402	=item aio_close $fh, $callback->($status)
402		403
403	Asynchronously close a file and call the callback with the result	404	Asynchronously close a file and call the callback with the result
…		…
601	namemax => 255,	602	namemax => 255,
602	frsize => 1024,	603	frsize => 1024,
603	fsid => 1810	604	fsid => 1810
604	}	605	}
605		606
		607	Here is a (likely partial - send me updates!) list of fsid values used by
		608	Linux - it is safe to hardcode these when C<$^O> is C<linux>:
		609
		610	0x0000adf5 adfs
		611	0x0000adff affs
		612	0x5346414f afs
		613	0x09041934 anon-inode filesystem
		614	0x00000187 autofs
		615	0x42465331 befs
		616	0x1badface bfs
		617	0x42494e4d binfmt_misc
		618	0x9123683e btrfs
		619	0x0027e0eb cgroupfs
		620	0xff534d42 cifs
		621	0x73757245 coda
		622	0x012ff7b7 coh
		623	0x28cd3d45 cramfs
		624	0x453dcd28 cramfs-wend (wrong endianness)
		625	0x64626720 debugfs
		626	0x00001373 devfs
		627	0x00001cd1 devpts
		628	0x0000f15f ecryptfs
		629	0x00414a53 efs
		630	0x0000137d ext
		631	0x0000ef53 ext2/ext3
		632	0x0000ef51 ext2
		633	0x00004006 fat
		634	0x65735546 fuseblk
		635	0x65735543 fusectl
		636	0x0bad1dea futexfs
		637	0x01161970 gfs2
		638	0x47504653 gpfs
		639	0x00004244 hfs
		640	0xf995e849 hpfs
		641	0x958458f6 hugetlbfs
		642	0x2bad1dea inotifyfs
		643	0x00009660 isofs
		644	0x000072b6 jffs2
		645	0x3153464a jfs
		646	0x6b414653 k-afs
		647	0x0bd00bd0 lustre
		648	0x0000137f minix
		649	0x0000138f minix 30 char names
		650	0x00002468 minix v2
		651	0x00002478 minix v2 30 char names
		652	0x00004d5a minix v3
		653	0x19800202 mqueue
		654	0x00004d44 msdos
		655	0x0000564c novell
		656	0x00006969 nfs
		657	0x6e667364 nfsd
		658	0x00003434 nilfs
		659	0x5346544e ntfs
		660	0x00009fa1 openprom
		661	0x7461636F ocfs2
		662	0x00009fa0 proc
		663	0x6165676c pstorefs
		664	0x0000002f qnx4
		665	0x858458f6 ramfs
		666	0x52654973 reiserfs
		667	0x00007275 romfs
		668	0x67596969 rpc_pipefs
		669	0x73636673 securityfs
		670	0xf97cff8c selinux
		671	0x0000517b smb
		672	0x534f434b sockfs
		673	0x73717368 squashfs
		674	0x62656572 sysfs
		675	0x012ff7b6 sysv2
		676	0x012ff7b5 sysv4
		677	0x01021994 tmpfs
		678	0x15013346 udf
		679	0x00011954 ufs
		680	0x54190100 ufs byteswapped
		681	0x00009fa2 usbdevfs
		682	0x01021997 v9fs
		683	0xa501fcf5 vxfs
		684	0xabba1974 xenfs
		685	0x012ff7b4 xenix
		686	0x58465342 xfs
		687	0x012fd16d xia
606		688
607	=item aio_utime $fh_or_path, $atime, $mtime, $callback->($status)	689	=item aio_utime $fh_or_path, $atime, $mtime, $callback->($status)
608		690
609	Works like perl's C<utime> function (including the special case of $atime	691	Works like perl's C<utime> function (including the special case of $atime
610	and $mtime being undef). Fractional times are supported if the underlying	692	and $mtime being undef). Fractional times are supported if the underlying
…		…
638	=item aio_truncate $fh_or_path, $offset, $callback->($status)	720	=item aio_truncate $fh_or_path, $offset, $callback->($status)
639		721
640	Works like truncate(2) or ftruncate(2).	722	Works like truncate(2) or ftruncate(2).
641		723
642		724
		725	=item aio_allocate $fh, $mode, $offset, $len, $callback->($status)
		726
		727	Allocates or frees disk space according to the C<$mode> argument. See the
		728	linux C<fallocate> documentation for details.
		729
		730	C<$mode> is usually C<0> or C<IO::AIO::FALLOC_FL_KEEP_SIZE> to allocate
		731	space, or C<IO::AIO::FALLOC_FL_PUNCH_HOLE \| IO::AIO::FALLOC_FL_KEEP_SIZE>,
		732	to deallocate a file range.
		733
		734	IO::AIO also supports C<FALLOC_FL_COLLAPSE_RANGE>, to remove a range
		735	(without leaving a hole) and C<FALLOC_FL_ZERO_RANGE>, to zero a range (see
		736	your L<fallocate(2)> manpage).
		737
		738	The file system block size used by C<fallocate> is presumably the
		739	C<f_bsize> returned by C<statvfs>.
		740
		741	If C<fallocate> isn't available or cannot be emulated (currently no
		742	emulation will be attempted), passes C<-1> and sets C<$!> to C<ENOSYS>.
		743
		744
643	=item aio_chmod $fh_or_path, $mode, $callback->($status)	745	=item aio_chmod $fh_or_path, $mode, $callback->($status)
644		746
645	Works like perl's C<chmod> function.	747	Works like perl's C<chmod> function.
646		748
647		749
…		…
684		786
685		787
686	=item aio_realpath $pathname, $callback->($path)	788	=item aio_realpath $pathname, $callback->($path)
687		789
688	Asynchronously make the path absolute and resolve any symlinks in	790	Asynchronously make the path absolute and resolve any symlinks in
689	C<$path>. The resulting path only consists of directories (Same as	791	C<$path>. The resulting path only consists of directories (same as
690	L<Cwd::realpath>).	792	L<Cwd::realpath>).
691		793
692	This request can be used to get the absolute path of the current working	794	This request can be used to get the absolute path of the current working
693	directory by passing it a path of F<.> (a single dot).	795	directory by passing it a path of F<.> (a single dot).
694		796
695		797
696	=item aio_rename $srcpath, $dstpath, $callback->($status)	798	=item aio_rename $srcpath, $dstpath, $callback->($status)
697		799
698	Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as	800	Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as
699	rename(2) and call the callback with the result code.	801	rename(2) and call the callback with the result code.
		802
		803	On systems that support the AIO::WD working directory abstraction
		804	natively, the case C<[$wd, "."]> as C<$srcpath> is specialcased - instead
		805	of failing, C<rename> is called on the absolute path of C<$wd>.
700		806
701		807
702	=item aio_mkdir $pathname, $mode, $callback->($status)	808	=item aio_mkdir $pathname, $mode, $callback->($status)
703		809
704	Asynchronously mkdir (create) a directory and call the callback with	810	Asynchronously mkdir (create) a directory and call the callback with
…		…
708		814
709	=item aio_rmdir $pathname, $callback->($status)	815	=item aio_rmdir $pathname, $callback->($status)
710		816
711	Asynchronously rmdir (delete) a directory and call the callback with the	817	Asynchronously rmdir (delete) a directory and call the callback with the
712	result code.	818	result code.
		819
		820	On systems that support the AIO::WD working directory abstraction
		821	natively, the case C<[$wd, "."]> is specialcased - instead of failing,
		822	C<rmdir> is called on the absolute path of C<$wd>.
713		823
714		824
715	=item aio_readdir $pathname, $callback->($entries)	825	=item aio_readdir $pathname, $callback->($entries)
716		826
717	Unlike the POSIX call of the same name, C<aio_readdir> reads an entire	827	Unlike the POSIX call of the same name, C<aio_readdir> reads an entire
…		…
1082	}	1192	}
1083		1193
1084	=item aio_rmtree $pathname, $callback->($status)	1194	=item aio_rmtree $pathname, $callback->($status)
1085		1195
1086	Delete a directory tree starting (and including) C<$path>, return the	1196	Delete a directory tree starting (and including) C<$path>, return the
1087	status of the final C<rmdir> only. This is a composite request that	1197	status of the final C<rmdir> only. This is a composite request that
1088	uses C<aio_scandir> to recurse into and rmdir directories, and unlink	1198	uses C<aio_scandir> to recurse into and rmdir directories, and unlink
1089	everything else.	1199	everything else.
1090		1200
1091	=cut	1201	=cut
1092		1202
…		…
1212		1322
1213	This is a rather advanced IO::AIO call, which works best on mmap(2)ed	1323	This is a rather advanced IO::AIO call, which works best on mmap(2)ed
1214	scalars.	1324	scalars.
1215		1325
1216	It touches (reads or writes) all memory pages in the specified	1326	It touches (reads or writes) all memory pages in the specified
1217	range inside the scalar. All caveats and parameters are the same	1327	range inside the scalar. All caveats and parameters are the same
1218	as for C<aio_msync>, above, except for flags, which must be either	1328	as for C<aio_msync>, above, except for flags, which must be either
1219	C<0> (which reads all pages and ensures they are instantiated) or	1329	C<0> (which reads all pages and ensures they are instantiated) or
1220	C<IO::AIO::MT_MODIFY>, which modifies the memory page s(by reading and	1330	C<IO::AIO::MT_MODIFY>, which modifies the memory pages (by reading and
1221	writing an octet from it, which dirties the page).	1331	writing an octet from it, which dirties the page).
1222		1332
1223	=item aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status)	1333	=item aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status)
1224		1334
1225	This is a rather advanced IO::AIO call, which works best on mmap(2)ed	1335	This is a rather advanced IO::AIO call, which works best on mmap(2)ed
…		…
1259		1369
1260	aio_mlockall IO::AIO::MCL_FUTURE;	1370	aio_mlockall IO::AIO::MCL_FUTURE;
1261		1371
1262	=item aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents)	1372	=item aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents)
1263		1373
1264	Queries the extents of the given file (by calling the Linux FIEMAP ioctl,	1374	Queries the extents of the given file (by calling the Linux C<FIEMAP>
1265	see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If the	1375	ioctl, see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If
1266	C<ioctl> is not available on your OS, then this rquiest will fail with	1376	the ioctl is not available on your OS, then this request will fail with
1267	C<ENOSYS>.	1377	C<ENOSYS>.
1268		1378
1269	C<$start> is the starting offset to query extents for, C<$length> is the	1379	C<$start> is the starting offset to query extents for, C<$length> is the
1270	size of the range to query - if it is C<undef>, then the whole file will	1380	size of the range to query - if it is C<undef>, then the whole file will
1271	be queried.	1381	be queried.
…		…
1274	C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also	1384	C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also
1275	exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query	1385	exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query
1276	the data portion.	1386	the data portion.
1277		1387
1278	C<$count> is the maximum number of extent records to return. If it is	1388	C<$count> is the maximum number of extent records to return. If it is
1279	C<undef>, then IO::AIO queries all extents of the file. As a very special	1389	C<undef>, then IO::AIO queries all extents of the range. As a very special
1280	case, if it is C<0>, then the callback receives the number of extents	1390	case, if it is C<0>, then the callback receives the number of extents
1281	instead of the extents themselves.	1391	instead of the extents themselves (which is unreliable, see below).
1282		1392
1283	If an error occurs, the callback receives no arguments. The special	1393	If an error occurs, the callback receives no arguments. The special
1284	C<errno> value C<IO::AIO::EBADR> is available to test for flag errors.	1394	C<errno> value C<IO::AIO::EBADR> is available to test for flag errors.
1285		1395
1286	Otherwise, the callback receives an array reference with extent	1396	Otherwise, the callback receives an array reference with extent
…		…
1288	following members:	1398	following members:
1289		1399
1290	[$logical, $physical, $length, $flags]	1400	[$logical, $physical, $length, $flags]
1291		1401
1292	Flags is any combination of the following flag values (typically either C<0>	1402	Flags is any combination of the following flag values (typically either C<0>
1293	or C<IO::AIO::FIEMAP_EXTENT_LAST>):	1403	or C<IO::AIO::FIEMAP_EXTENT_LAST> (1)):
1294		1404
1295	C<IO::AIO::FIEMAP_EXTENT_LAST>, C<IO::AIO::FIEMAP_EXTENT_UNKNOWN>,	1405	C<IO::AIO::FIEMAP_EXTENT_LAST>, C<IO::AIO::FIEMAP_EXTENT_UNKNOWN>,
1296	C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>,	1406	C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>,
1297	C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>,	1407	C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>,
1298	C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>,	1408	C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>,
1299	C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or	1409	C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or
1300	C<IO::AIO::FIEMAP_EXTENT_SHARED>.	1410	C<IO::AIO::FIEMAP_EXTENT_SHARED>.
1301		1411
		1412	At the time of this writing (Linux 3.2), this requets is unreliable unless
		1413	C<$count> is C<undef>, as the kernel has all sorts of bugs preventing
		1414	it to return all extents of a range for files with large number of
		1415	extents. The code works around all these issues if C<$count> is undef.
		1416
1302	=item aio_group $callback->(...)	1417	=item aio_group $callback->(...)
1303		1418
1304	This is a very special aio request: Instead of doing something, it is a	1419	This is a very special aio request: Instead of doing something, it is a
1305	container for other aio requests, which is useful if you want to bundle	1420	container for other aio requests, which is useful if you want to bundle
1306	many requests into a single, composite, request with a definite callback	1421	many requests into a single, composite, request with a definite callback
…		…
1389	aio_stat [$etcdir, "passwd"], sub {	1504	aio_stat [$etcdir, "passwd"], sub {
1390	# yay	1505	# yay
1391	};	1506	};
1392	};	1507	};
1393		1508
1394	That C<aio_wd> is a request and not a normal function shows that creating	1509	The fact that C<aio_wd> is a request and not a normal function shows that
1395	an IO::AIO::WD object is itself a potentially blocking operation, which is	1510	creating an IO::AIO::WD object is itself a potentially blocking operation,
1396	why it is done asynchronously.	1511	which is why it is done asynchronously.
1397		1512
1398	To stat the directory obtained with C<aio_wd> above, one could write	1513	To stat the directory obtained with C<aio_wd> above, one could write
1399	either of the following three request calls:	1514	either of the following three request calls:
1400		1515
1401	aio_lstat "/etc" , sub { ... # pathname as normal string	1516	aio_lstat "/etc" , sub { ... # pathname as normal string
…		…
1421	will still point to the original directory. Most functions accepting a	1536	will still point to the original directory. Most functions accepting a
1422	pathname will use the directory fd on newer systems, and the string on	1537	pathname will use the directory fd on newer systems, and the string on
1423	older systems. Some functions (such as realpath) will always rely on the	1538	older systems. Some functions (such as realpath) will always rely on the
1424	string form of the pathname.	1539	string form of the pathname.
1425		1540
1426	So this fucntionality is mainly useful to get some protection against	1541	So this functionality is mainly useful to get some protection against
1427	C<chdir>, to easily get an absolute path out of a relative path for future	1542	C<chdir>, to easily get an absolute path out of a relative path for future
1428	reference, and to speed up doing many operations in the same directory	1543	reference, and to speed up doing many operations in the same directory
1429	(e.g. when stat'ing all files in a directory).	1544	(e.g. when stat'ing all files in a directory).
1430		1545
1431	The following functions implement this working directory abstraction:	1546	The following functions implement this working directory abstraction:
…		…
1444	passing C<undef> as working directory component of a pathname fails the	1559	passing C<undef> as working directory component of a pathname fails the
1445	request with C<ENOENT>, there is often no need for error checking in the	1560	request with C<ENOENT>, there is often no need for error checking in the
1446	C<aio_wd> callback, as future requests using the value will fail in the	1561	C<aio_wd> callback, as future requests using the value will fail in the
1447	expected way.	1562	expected way.
1448		1563
1449	If this call isn't available because your OS lacks it or it couldn't be
1450	detected, it will be emulated by calling C<fsync> instead.
1451
1452	=item IO::AIO::CWD	1564	=item IO::AIO::CWD
1453		1565
1454	This is a compiletime constant (object) that represents the process	1566	This is a compiletime constant (object) that represents the process
1455	current working directory.	1567	current working directory.
1456		1568
1457	Specifying this object as working directory object for a pathname is as	1569	Specifying this object as working directory object for a pathname is as if
1458	if the pathname would be specified directly, without a directory object,	1570	the pathname would be specified directly, without a directory object. For
1459	e.g., these calls are functionally identical:	1571	example, these calls are functionally identical:
1460		1572
1461	aio_stat "somefile", sub { ... };	1573	aio_stat "somefile", sub { ... };
1462	aio_stat [IO::AIO::CWD, "somefile"], sub { ... };	1574	aio_stat [IO::AIO::CWD, "somefile"], sub { ... };
1463		1575
1464	=back	1576	=back
1465		1577
		1578	To recover the path associated with an IO::AIO::WD object, you can use
		1579	C<aio_realpath>:
		1580
		1581	aio_realpath $wd, sub {
		1582	warn "path is $_[0]\n";
		1583	};
		1584
		1585	Currently, C<aio_statvfs> always, and C<aio_rename> and C<aio_rmdir>
		1586	sometimes, fall back to using an absolue path.
1466		1587
1467	=head2 IO::AIO::REQ CLASS	1588	=head2 IO::AIO::REQ CLASS
1468		1589
1469	All non-aggregate C<aio_*> functions return an object of this class when	1590	All non-aggregate C<aio_*> functions return an object of this class when
1470	called in non-void context.	1591	called in non-void context.
…		…
1648		1769
1649	See C<poll_cb> for an example.	1770	See C<poll_cb> for an example.
1650		1771
1651	=item IO::AIO::poll_cb	1772	=item IO::AIO::poll_cb
1652		1773
1653	Process some outstanding events on the result pipe. You have to call	1774	Process some requests that have reached the result phase (i.e. they have
		1775	been executed but the results are not yet reported). You have to call
		1776	this "regularly" to finish outstanding requests.
		1777
1654	this regularly. Returns C<0> if all events could be processed (or there	1778	Returns C<0> if all events could be processed (or there were no
1655	were no events to process), or C<-1> if it returned earlier for whatever	1779	events to process), or C<-1> if it returned earlier for whatever
1656	reason. Returns immediately when no events are outstanding. The amount of	1780	reason. Returns immediately when no events are outstanding. The amount
1657	events processed depends on the settings of C<IO::AIO::max_poll_req> and	1781	of events processed depends on the settings of C<IO::AIO::max_poll_req>,
1658	C<IO::AIO::max_poll_time>.	1782	C<IO::AIO::max_poll_time> and C<IO::AIO::max_outstanding>.
1659		1783
1660	If not all requests were processed for whatever reason, the filehandle	1784	If not all requests were processed for whatever reason, the poll file
1661	will still be ready when C<poll_cb> returns, so normally you don't have to	1785	descriptor will still be ready when C<poll_cb> returns, so normally you
1662	do anything special to have it called later.	1786	don't have to do anything special to have it called later.
1663		1787
1664	Apart from calling C<IO::AIO::poll_cb> when the event filehandle becomes	1788	Apart from calling C<IO::AIO::poll_cb> when the event filehandle becomes
1665	ready, it can be beneficial to call this function from loops which submit	1789	ready, it can be beneficial to call this function from loops which submit
1666	a lot of requests, to make sure the results get processed when they become	1790	a lot of requests, to make sure the results get processed when they become
1667	available and not just when the loop is finished and the event loop takes	1791	available and not just when the loop is finished and the event loop takes
…		…
1676	poll => 'r', async => 1,	1800	poll => 'r', async => 1,
1677	cb => \&IO::AIO::poll_cb);	1801	cb => \&IO::AIO::poll_cb);
1678		1802
1679	=item IO::AIO::poll_wait	1803	=item IO::AIO::poll_wait
1680		1804
1681	If there are any outstanding requests and none of them in the result	1805	Wait until either at least one request is in the result phase or no
1682	phase, wait till the result filehandle becomes ready for reading (simply	1806	requests are outstanding anymore.
1683	does a C<select> on the filehandle. This is useful if you want to	1807
1684	synchronously wait for some requests to finish).	1808	This is useful if you want to synchronously wait for some requests to
		1809	become ready, without actually handling them.
1685		1810
1686	See C<nreqs> for an example.	1811	See C<nreqs> for an example.
1687		1812
1688	=item IO::AIO::poll	1813	=item IO::AIO::poll
1689		1814
…		…
1810		1935
1811	This is a very bad function to use in interactive programs because it	1936	This is a very bad function to use in interactive programs because it
1812	blocks, and a bad way to reduce concurrency because it is inexact: Better	1937	blocks, and a bad way to reduce concurrency because it is inexact: Better
1813	use an C<aio_group> together with a feed callback.	1938	use an C<aio_group> together with a feed callback.
1814		1939
1815	It's main use is in scripts without an event loop - when you want to stat	1940	Its main use is in scripts without an event loop - when you want to stat
1816	a lot of files, you can write somehting like this:	1941	a lot of files, you can write somehting like this:
1817		1942
1818	IO::AIO::max_outstanding 32;	1943	IO::AIO::max_outstanding 32;
1819		1944
1820	for my $path (...) {	1945	for my $path (...) {
…		…
1860		1985
1861	=back	1986	=back
1862		1987
1863	=head3 MISCELLANEOUS FUNCTIONS	1988	=head3 MISCELLANEOUS FUNCTIONS
1864		1989
1865	IO::AIO implements some functions that might be useful, but are not	1990	IO::AIO implements some functions that are useful when you want to use
1866	asynchronous.	1991	some "Advanced I/O" function not available to in Perl, without going the
		1992	"Asynchronous I/O" route. Many of these have an asynchronous C<aio_*>
		1993	counterpart.
1867		1994
1868	=over 4	1995	=over 4
1869		1996
1870	=item IO::AIO::sendfile $ofh, $ifh, $offset, $count	1997	=item IO::AIO::sendfile $ofh, $ifh, $offset, $count
1871		1998
…		…
1989		2116
1990	See the C<splice(2)> manpage for details.	2117	See the C<splice(2)> manpage for details.
1991		2118
1992	=item IO::AIO::tee $r_fh, $w_fh, $length, $flags	2119	=item IO::AIO::tee $r_fh, $w_fh, $length, $flags
1993		2120
1994	Calls the GNU/Linux C<tee(2)> syscall, see it's manpage and the	2121	Calls the GNU/Linux C<tee(2)> syscall, see its manpage and the
1995	description for C<IO::AIO::splice> above for details.	2122	description for C<IO::AIO::splice> above for details.
		2123
		2124	=item $actual_size = IO::AIO::pipesize $r_fh[, $new_size]
		2125
		2126	Attempts to query or change the pipe buffer size. Obviously works only
		2127	on pipes, and currently works only on GNU/Linux systems, and fails with
		2128	C<-1>/C<ENOSYS> everywhere else. If anybody knows how to influence pipe buffer
		2129	size on other systems, drop me a note.
		2130
		2131	=item ($rfh, $wfh) = IO::AIO::pipe2 [$flags]
		2132
		2133	This is a direct interface to the Linux L<pipe2(2)> system call. If
		2134	C<$flags> is missing or C<0>, then this should be the same as a call to
		2135	perl's built-in C<pipe> function and create a new pipe, and works on
		2136	systems that lack the pipe2 syscall. On win32, this case invokes C<_pipe
		2137	(..., 4096, O_BINARY)>.
		2138
		2139	If C<$flags> is non-zero, it tries to invoke the pipe2 system call with
		2140	the given flags (Linux 2.6.27, glibc 2.9).
		2141
		2142	On success, the read and write file handles are returned.
		2143
		2144	On error, nothing will be returned. If the pipe2 syscall is missing and
		2145	C<$flags> is non-zero, fails with C<ENOSYS>.
		2146
		2147	Please refer to L<pipe2(2)> for more info on the C<$flags>, but at the
		2148	time of this writing, C<IO::AIO::O_CLOEXEC>, C<IO::AIO::O_NONBLOCK> and
		2149	C<IO::AIO::O_DIRECT> (Linux 3.4, for packet-based pipes) were supported.
1996		2150
1997	=back	2151	=back
1998		2152
1999	=cut	2153	=cut
2000		2154

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Comparing IO-AIO/AIO.pm (file contents): Revision 1.228 by root, Sun Jun 17 17:07:25 2012 UTC vs. Revision 1.255 by root, Thu Jun 25 15:20:11 2015 UTC

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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.228 by root, Sun Jun 17 17:07:25 2012 UTC vs.
Revision 1.255 by root, Thu Jun 25 15:20:11 2015 UTC