| … | |
… | |
| 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 = '4.0'; |
172 | our $VERSION = 4.31; |
| 174 | |
173 | |
| 175 | our @AIO_REQ = qw(aio_sendfile 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 |
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 |
| 184 | aio_statvfs |
183 | aio_statvfs |
| … | |
… | |
| 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) |
|
|
213 | aio_seek $fh,$offset,$whence, $callback->($offs) |
| 214 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
214 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
| 215 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
215 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
| 216 | aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
216 | aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
| 217 | aio_readahead $fh,$offset,$length, $callback->($retval) |
217 | aio_readahead $fh,$offset,$length, $callback->($retval) |
| 218 | aio_stat $fh_or_path, $callback->($status) |
218 | aio_stat $fh_or_path, $callback->($status) |
| 219 | aio_lstat $fh, $callback->($status) |
219 | aio_lstat $fh, $callback->($status) |
| 220 | aio_statvfs $fh_or_path, $callback->($statvfs) |
220 | aio_statvfs $fh_or_path, $callback->($statvfs) |
| 221 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
221 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
| 222 | aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
222 | aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
|
|
223 | aio_chmod $fh_or_path, $mode, $callback->($status) |
| 223 | aio_truncate $fh_or_path, $offset, $callback->($status) |
224 | aio_truncate $fh_or_path, $offset, $callback->($status) |
| 224 | aio_chmod $fh_or_path, $mode, $callback->($status) |
225 | aio_allocate $fh, $mode, $offset, $len, $callback->($status) |
|
|
226 | aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
| 225 | aio_unlink $pathname, $callback->($status) |
227 | aio_unlink $pathname, $callback->($status) |
| 226 | aio_mknod $pathname, $mode, $dev, $callback->($status) |
228 | aio_mknod $pathname, $mode, $dev, $callback->($status) |
| 227 | aio_link $srcpath, $dstpath, $callback->($status) |
229 | aio_link $srcpath, $dstpath, $callback->($status) |
| 228 | aio_symlink $srcpath, $dstpath, $callback->($status) |
230 | aio_symlink $srcpath, $dstpath, $callback->($status) |
| 229 | aio_readlink $pathname, $callback->($link) |
231 | aio_readlink $pathname, $callback->($link) |
| 230 | aio_realpath $pathname, $callback->($link) |
232 | aio_realpath $pathname, $callback->($path) |
| 231 | aio_rename $srcpath, $dstpath, $callback->($status) |
233 | aio_rename $srcpath, $dstpath, $callback->($status) |
| 232 | aio_mkdir $pathname, $mode, $callback->($status) |
234 | aio_mkdir $pathname, $mode, $callback->($status) |
| 233 | aio_rmdir $pathname, $callback->($status) |
235 | aio_rmdir $pathname, $callback->($status) |
| 234 | aio_readdir $pathname, $callback->($entries) |
236 | aio_readdir $pathname, $callback->($entries) |
| 235 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
237 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
| 236 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
238 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
| 237 | 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) |
| 238 | aio_load $pathname, $data, $callback->($status) |
241 | aio_load $pathname, $data, $callback->($status) |
| 239 | aio_copy $srcpath, $dstpath, $callback->($status) |
242 | aio_copy $srcpath, $dstpath, $callback->($status) |
| 240 | aio_move $srcpath, $dstpath, $callback->($status) |
243 | aio_move $srcpath, $dstpath, $callback->($status) |
| 241 | aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs) |
|
|
| 242 | aio_rmtree $pathname, $callback->($status) |
244 | aio_rmtree $pathname, $callback->($status) |
| 243 | aio_sync $callback->($status) |
245 | aio_sync $callback->($status) |
| 244 | aio_syncfs $fh, $callback->($status) |
246 | aio_syncfs $fh, $callback->($status) |
| 245 | aio_fsync $fh, $callback->($status) |
247 | aio_fsync $fh, $callback->($status) |
| 246 | aio_fdatasync $fh, $callback->($status) |
248 | aio_fdatasync $fh, $callback->($status) |
| … | |
… | |
| 271 | IO::AIO::nready |
273 | IO::AIO::nready |
| 272 | IO::AIO::npending |
274 | IO::AIO::npending |
| 273 | |
275 | |
| 274 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
276 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
| 275 | 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 |
| 276 | IO::AIO::madvise $scalar, $offset, $length, $advice |
280 | IO::AIO::madvise $scalar, $offset, $length, $advice |
| 277 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
281 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
| 278 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
282 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
| 279 | IO::AIO::munlockall |
283 | IO::AIO::munlockall |
| 280 | |
284 | |
| 281 | =head2 AIO REQUEST FUNCTIONS |
285 | =head2 API NOTES |
| 282 | |
286 | |
| 283 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
287 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
| 284 | with the same name (sans C<aio_>). The arguments are similar or identical, |
288 | with the same name (sans C<aio_>). The arguments are similar or identical, |
| 285 | and they all accept an additional (and optional) C<$callback> argument |
289 | and they all accept an additional (and optional) C<$callback> argument |
| 286 | which must be a code reference. This code reference will get called with |
290 | which must be a code reference. This code reference will be called after |
| 287 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
291 | the syscall has been executed in an asynchronous fashion. The results |
| 288 | perl, which usually delivers "false") as its sole argument after the given |
292 | of the request will be passed as arguments to the callback (and, if an |
| 289 | syscall has been executed asynchronously. |
293 | error occured, in C<$!>) - 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>. |
| 290 | |
299 | |
| 291 | All functions expecting a filehandle keep a copy of the filehandle |
300 | All functions expecting a filehandle keep a copy of the filehandle |
| 292 | internally until the request has finished. |
301 | internally until the request has finished. |
| 293 | |
302 | |
| 294 | 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 |
| 295 | further manipulation of those requests while they are in-flight. |
304 | further manipulation of those requests while they are in-flight. |
| 296 | |
305 | |
| 297 | The pathnames you pass to these routines I<should> be absolute. The |
306 | The pathnames you pass to these routines I<should> be absolute. The |
| 298 | reason for this is that at the time the request is being executed, the |
307 | reason for this is that at the time the request is being executed, the |
| 299 | current working directory could have changed. Alternatively, you can make |
308 | current working directory could have changed. Alternatively, you can |
| 300 | sure that you never change the current working directory anywhere in |
309 | make sure that you never change the current working directory anywhere |
| 301 | the program and then use relative paths. Lastly, you can take advantage |
310 | in the program and then use relative paths. You can also take advantage |
| 302 | of IO::AIOs working directory abstraction - see the description of the |
311 | of IO::AIOs working directory abstraction, that lets you specify paths |
|
|
312 | relative to some previously-opened "working directory object" - see the |
| 303 | C<IO::AIO::WD> class later in this document. |
313 | description of the C<IO::AIO::WD> class later in this document. |
| 304 | |
314 | |
| 305 | 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 |
| 306 | in filenames you got from outside (command line, readdir etc.) without |
316 | in filenames you got from outside (command line, readdir etc.) without |
| 307 | 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 |
| 308 | 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 |
| 309 | 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 |
| 310 | 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. |
| 311 | |
322 | |
| 312 | 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 |
| 313 | handles correctly whether it is set or not. |
324 | handles correctly whether it is set or not. |
|
|
325 | |
|
|
326 | =head2 AIO REQUEST FUNCTIONS |
| 314 | |
327 | |
| 315 | =over 4 |
328 | =over 4 |
| 316 | |
329 | |
| 317 | =item $prev_pri = aioreq_pri [$pri] |
330 | =item $prev_pri = aioreq_pri [$pri] |
| 318 | |
331 | |
| … | |
… | |
| 348 | |
361 | |
| 349 | |
362 | |
| 350 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
363 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
| 351 | |
364 | |
| 352 | 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 |
| 353 | created filehandle for the file. |
366 | created filehandle for the file (or C<undef> in case of an error). |
| 354 | |
367 | |
| 355 | 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, |
| 356 | for an explanation. |
369 | for an explanation. |
| 357 | |
370 | |
| 358 | 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 |
| … | |
… | |
| 400 | |
413 | |
| 401 | 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 |
| 402 | free for reuse until the perl filehandle is closed. |
415 | free for reuse until the perl filehandle is closed. |
| 403 | |
416 | |
| 404 | =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". |
| 405 | |
438 | |
| 406 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
439 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
| 407 | |
440 | |
| 408 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
441 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
| 409 | |
442 | |
| … | |
… | |
| 569 | namemax => 255, |
602 | namemax => 255, |
| 570 | frsize => 1024, |
603 | frsize => 1024, |
| 571 | fsid => 1810 |
604 | fsid => 1810 |
| 572 | } |
605 | } |
| 573 | |
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 |
| 574 | |
688 | |
| 575 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
689 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
| 576 | |
690 | |
| 577 | 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 |
| 578 | and $mtime being undef). Fractional times are supported if the underlying |
692 | and $mtime being undef). Fractional times are supported if the underlying |
| … | |
… | |
| 606 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
720 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
| 607 | |
721 | |
| 608 | Works like truncate(2) or ftruncate(2). |
722 | Works like truncate(2) or ftruncate(2). |
| 609 | |
723 | |
| 610 | |
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> can currently be C<0> or C<IO::AIO::FALLOC_FL_KEEP_SIZE> |
|
|
731 | to allocate space, or C<IO::AIO::FALLOC_FL_PUNCH_HOLE | |
|
|
732 | IO::AIO::FALLOC_FL_KEEP_SIZE>, to deallocate a file range. |
|
|
733 | |
|
|
734 | The file system block size used by C<fallocate> is presumably the |
|
|
735 | C<f_bsize> returned by C<statvfs>. |
|
|
736 | |
|
|
737 | If C<fallocate> isn't available or cannot be emulated (currently no |
|
|
738 | emulation will be attempted), passes C<-1> and sets C<$!> to C<ENOSYS>. |
|
|
739 | |
|
|
740 | |
| 611 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
741 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
| 612 | |
742 | |
| 613 | Works like perl's C<chmod> function. |
743 | Works like perl's C<chmod> function. |
| 614 | |
744 | |
| 615 | |
745 | |
| … | |
… | |
| 652 | |
782 | |
| 653 | |
783 | |
| 654 | =item aio_realpath $pathname, $callback->($path) |
784 | =item aio_realpath $pathname, $callback->($path) |
| 655 | |
785 | |
| 656 | Asynchronously make the path absolute and resolve any symlinks in |
786 | Asynchronously make the path absolute and resolve any symlinks in |
| 657 | C<$path>. The resulting path only consists of directories (Same as |
787 | C<$path>. The resulting path only consists of directories (same as |
| 658 | L<Cwd::realpath>). |
788 | L<Cwd::realpath>). |
| 659 | |
789 | |
| 660 | This request can be used to get the absolute path of the current working |
790 | This request can be used to get the absolute path of the current working |
| 661 | directory by passing it a path of F<.> (a single dot). |
791 | directory by passing it a path of F<.> (a single dot). |
| 662 | |
792 | |
| 663 | |
793 | |
| 664 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
794 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
| 665 | |
795 | |
| 666 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
796 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
| 667 | rename(2) and call the callback with the result code. |
797 | rename(2) and call the callback with the result code. |
|
|
798 | |
|
|
799 | On systems that support the AIO::WD working directory abstraction |
|
|
800 | natively, the case C<[$wd, "."]> as C<$srcpath> is specialcased - instead |
|
|
801 | of failing, C<rename> is called on the absolute path of C<$wd>. |
| 668 | |
802 | |
| 669 | |
803 | |
| 670 | =item aio_mkdir $pathname, $mode, $callback->($status) |
804 | =item aio_mkdir $pathname, $mode, $callback->($status) |
| 671 | |
805 | |
| 672 | Asynchronously mkdir (create) a directory and call the callback with |
806 | Asynchronously mkdir (create) a directory and call the callback with |
| … | |
… | |
| 676 | |
810 | |
| 677 | =item aio_rmdir $pathname, $callback->($status) |
811 | =item aio_rmdir $pathname, $callback->($status) |
| 678 | |
812 | |
| 679 | Asynchronously rmdir (delete) a directory and call the callback with the |
813 | Asynchronously rmdir (delete) a directory and call the callback with the |
| 680 | result code. |
814 | result code. |
|
|
815 | |
|
|
816 | On systems that support the AIO::WD working directory abstraction |
|
|
817 | natively, the case C<[$wd, "."]> is specialcased - instead of failing, |
|
|
818 | C<rmdir> is called on the absolute path of C<$wd>. |
| 681 | |
819 | |
| 682 | |
820 | |
| 683 | =item aio_readdir $pathname, $callback->($entries) |
821 | =item aio_readdir $pathname, $callback->($entries) |
| 684 | |
822 | |
| 685 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
823 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
| … | |
… | |
| 966 | |
1104 | |
| 967 | my $grp = aio_group $cb; |
1105 | my $grp = aio_group $cb; |
| 968 | |
1106 | |
| 969 | $maxreq = 4 if $maxreq <= 0; |
1107 | $maxreq = 4 if $maxreq <= 0; |
| 970 | |
1108 | |
| 971 | # stat once |
1109 | # get a wd object |
| 972 | aioreq_pri $pri; |
1110 | aioreq_pri $pri; |
| 973 | add $grp aio_stat $path, sub { |
1111 | add $grp aio_wd $path, sub { |
|
|
1112 | $_[0] |
| 974 | return $grp->result () if $_[0]; |
1113 | or return $grp->result (); |
| 975 | my $now = time; |
|
|
| 976 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
| 977 | |
1114 | |
| 978 | # read the directory entries |
1115 | my $wd = [shift, "."]; |
|
|
1116 | |
|
|
1117 | # stat once |
| 979 | aioreq_pri $pri; |
1118 | aioreq_pri $pri; |
| 980 | add $grp aio_readdirx $path, READDIR_DIRS_FIRST, sub { |
1119 | add $grp aio_stat $wd, sub { |
| 981 | my $entries = shift |
|
|
| 982 | or return $grp->result (); |
1120 | return $grp->result () if $_[0]; |
|
|
1121 | my $now = time; |
|
|
1122 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
| 983 | |
1123 | |
| 984 | # stat the dir another time |
1124 | # read the directory entries |
| 985 | aioreq_pri $pri; |
1125 | aioreq_pri $pri; |
|
|
1126 | add $grp aio_readdirx $wd, READDIR_DIRS_FIRST, sub { |
|
|
1127 | my $entries = shift |
|
|
1128 | or return $grp->result (); |
|
|
1129 | |
|
|
1130 | # stat the dir another time |
|
|
1131 | aioreq_pri $pri; |
| 986 | add $grp aio_stat $path, sub { |
1132 | add $grp aio_stat $wd, sub { |
| 987 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
1133 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
| 988 | |
1134 | |
| 989 | my $ndirs; |
1135 | my $ndirs; |
| 990 | |
1136 | |
| 991 | # take the slow route if anything looks fishy |
1137 | # take the slow route if anything looks fishy |
| 992 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
1138 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
| 993 | $ndirs = -1; |
1139 | $ndirs = -1; |
| 994 | } else { |
1140 | } else { |
| 995 | # if nlink == 2, we are finished |
1141 | # if nlink == 2, we are finished |
| 996 | # for non-posix-fs's, we rely on nlink < 2 |
1142 | # for non-posix-fs's, we rely on nlink < 2 |
| 997 | $ndirs = (stat _)[3] - 2 |
1143 | $ndirs = (stat _)[3] - 2 |
| 998 | or return $grp->result ([], $entries); |
1144 | or return $grp->result ([], $entries); |
| 999 | } |
1145 | } |
| 1000 | |
1146 | |
| 1001 | my (@dirs, @nondirs); |
1147 | my (@dirs, @nondirs); |
| 1002 | |
1148 | |
| 1003 | my $statgrp = add $grp aio_group sub { |
1149 | my $statgrp = add $grp aio_group sub { |
| 1004 | $grp->result (\@dirs, \@nondirs); |
1150 | $grp->result (\@dirs, \@nondirs); |
| 1005 | }; |
1151 | }; |
| 1006 | |
1152 | |
| 1007 | limit $statgrp $maxreq; |
1153 | limit $statgrp $maxreq; |
| 1008 | feed $statgrp sub { |
1154 | feed $statgrp sub { |
| 1009 | return unless @$entries; |
1155 | return unless @$entries; |
| 1010 | my $entry = shift @$entries; |
1156 | my $entry = shift @$entries; |
| 1011 | |
1157 | |
| 1012 | aioreq_pri $pri; |
1158 | aioreq_pri $pri; |
|
|
1159 | $wd->[1] = "$entry/."; |
| 1013 | add $statgrp aio_stat "$path/$entry/.", sub { |
1160 | add $statgrp aio_stat $wd, sub { |
| 1014 | if ($_[0] < 0) { |
1161 | if ($_[0] < 0) { |
| 1015 | push @nondirs, $entry; |
1162 | push @nondirs, $entry; |
| 1016 | } else { |
1163 | } else { |
| 1017 | # need to check for real directory |
1164 | # need to check for real directory |
| 1018 | aioreq_pri $pri; |
1165 | aioreq_pri $pri; |
|
|
1166 | $wd->[1] = $entry; |
| 1019 | add $statgrp aio_lstat "$path/$entry", sub { |
1167 | add $statgrp aio_lstat $wd, sub { |
| 1020 | if (-d _) { |
1168 | if (-d _) { |
| 1021 | push @dirs, $entry; |
1169 | push @dirs, $entry; |
| 1022 | |
1170 | |
| 1023 | unless (--$ndirs) { |
1171 | unless (--$ndirs) { |
| 1024 | push @nondirs, @$entries; |
1172 | push @nondirs, @$entries; |
| 1025 | feed $statgrp; |
1173 | feed $statgrp; |
|
|
1174 | } |
|
|
1175 | } else { |
|
|
1176 | push @nondirs, $entry; |
| 1026 | } |
1177 | } |
| 1027 | } else { |
|
|
| 1028 | push @nondirs, $entry; |
|
|
| 1029 | } |
1178 | } |
| 1030 | } |
1179 | } |
| 1031 | } |
1180 | }; |
| 1032 | }; |
1181 | }; |
| 1033 | }; |
1182 | }; |
| 1034 | }; |
1183 | }; |
| 1035 | }; |
1184 | }; |
| 1036 | }; |
1185 | }; |
| … | |
… | |
| 1039 | } |
1188 | } |
| 1040 | |
1189 | |
| 1041 | =item aio_rmtree $pathname, $callback->($status) |
1190 | =item aio_rmtree $pathname, $callback->($status) |
| 1042 | |
1191 | |
| 1043 | Delete a directory tree starting (and including) C<$path>, return the |
1192 | Delete a directory tree starting (and including) C<$path>, return the |
| 1044 | status of the final C<rmdir> only. This is a composite request that |
1193 | status of the final C<rmdir> only. This is a composite request that |
| 1045 | uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
1194 | uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
| 1046 | everything else. |
1195 | everything else. |
| 1047 | |
1196 | |
| 1048 | =cut |
1197 | =cut |
| 1049 | |
1198 | |
| … | |
… | |
| 1169 | |
1318 | |
| 1170 | This is a rather advanced IO::AIO call, which works best on mmap(2)ed |
1319 | This is a rather advanced IO::AIO call, which works best on mmap(2)ed |
| 1171 | scalars. |
1320 | scalars. |
| 1172 | |
1321 | |
| 1173 | It touches (reads or writes) all memory pages in the specified |
1322 | It touches (reads or writes) all memory pages in the specified |
| 1174 | range inside the scalar. All caveats and parameters are the same |
1323 | range inside the scalar. All caveats and parameters are the same |
| 1175 | as for C<aio_msync>, above, except for flags, which must be either |
1324 | as for C<aio_msync>, above, except for flags, which must be either |
| 1176 | C<0> (which reads all pages and ensures they are instantiated) or |
1325 | C<0> (which reads all pages and ensures they are instantiated) or |
| 1177 | C<IO::AIO::MT_MODIFY>, which modifies the memory page s(by reading and |
1326 | C<IO::AIO::MT_MODIFY>, which modifies the memory pages (by reading and |
| 1178 | writing an octet from it, which dirties the page). |
1327 | writing an octet from it, which dirties the page). |
| 1179 | |
1328 | |
| 1180 | =item aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
1329 | =item aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
| 1181 | |
1330 | |
| 1182 | This is a rather advanced IO::AIO call, which works best on mmap(2)ed |
1331 | This is a rather advanced IO::AIO call, which works best on mmap(2)ed |
| … | |
… | |
| 1213 | documented under L<MISCELLANEOUS FUNCTIONS>. |
1362 | documented under L<MISCELLANEOUS FUNCTIONS>. |
| 1214 | |
1363 | |
| 1215 | Example: asynchronously lock all current and future pages into memory. |
1364 | Example: asynchronously lock all current and future pages into memory. |
| 1216 | |
1365 | |
| 1217 | aio_mlockall IO::AIO::MCL_FUTURE; |
1366 | aio_mlockall IO::AIO::MCL_FUTURE; |
|
|
1367 | |
|
|
1368 | =item aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
|
|
1369 | |
|
|
1370 | Queries the extents of the given file (by calling the Linux C<FIEMAP> |
|
|
1371 | ioctl, see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If |
|
|
1372 | the ioctl is not available on your OS, then this request will fail with |
|
|
1373 | C<ENOSYS>. |
|
|
1374 | |
|
|
1375 | C<$start> is the starting offset to query extents for, C<$length> is the |
|
|
1376 | size of the range to query - if it is C<undef>, then the whole file will |
|
|
1377 | be queried. |
|
|
1378 | |
|
|
1379 | C<$flags> is a combination of flags (C<IO::AIO::FIEMAP_FLAG_SYNC> or |
|
|
1380 | C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also |
|
|
1381 | exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query |
|
|
1382 | the data portion. |
|
|
1383 | |
|
|
1384 | C<$count> is the maximum number of extent records to return. If it is |
|
|
1385 | C<undef>, then IO::AIO queries all extents of the range. As a very special |
|
|
1386 | case, if it is C<0>, then the callback receives the number of extents |
|
|
1387 | instead of the extents themselves (which is unreliable, see below). |
|
|
1388 | |
|
|
1389 | If an error occurs, the callback receives no arguments. The special |
|
|
1390 | C<errno> value C<IO::AIO::EBADR> is available to test for flag errors. |
|
|
1391 | |
|
|
1392 | Otherwise, the callback receives an array reference with extent |
|
|
1393 | structures. Each extent structure is an array reference itself, with the |
|
|
1394 | following members: |
|
|
1395 | |
|
|
1396 | [$logical, $physical, $length, $flags] |
|
|
1397 | |
|
|
1398 | Flags is any combination of the following flag values (typically either C<0> |
|
|
1399 | or C<IO::AIO::FIEMAP_EXTENT_LAST> (1)): |
|
|
1400 | |
|
|
1401 | C<IO::AIO::FIEMAP_EXTENT_LAST>, C<IO::AIO::FIEMAP_EXTENT_UNKNOWN>, |
|
|
1402 | C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>, |
|
|
1403 | C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>, |
|
|
1404 | C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>, |
|
|
1405 | C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or |
|
|
1406 | C<IO::AIO::FIEMAP_EXTENT_SHARED>. |
|
|
1407 | |
|
|
1408 | At the time of this writing (Linux 3.2), this requets is unreliable unless |
|
|
1409 | C<$count> is C<undef>, as the kernel has all sorts of bugs preventing |
|
|
1410 | it to return all extents of a range for files with large number of |
|
|
1411 | extents. The code works around all these issues if C<$count> is undef. |
| 1218 | |
1412 | |
| 1219 | =item aio_group $callback->(...) |
1413 | =item aio_group $callback->(...) |
| 1220 | |
1414 | |
| 1221 | This is a very special aio request: Instead of doing something, it is a |
1415 | This is a very special aio request: Instead of doing something, it is a |
| 1222 | container for other aio requests, which is useful if you want to bundle |
1416 | container for other aio requests, which is useful if you want to bundle |
| … | |
… | |
| 1286 | object. This object stores the canonicalised, absolute version of the |
1480 | object. This object stores the canonicalised, absolute version of the |
| 1287 | path, and on systems that allow it, also a directory file descriptor. |
1481 | path, and on systems that allow it, also a directory file descriptor. |
| 1288 | |
1482 | |
| 1289 | Everywhere where a pathname is accepted by IO::AIO (e.g. in C<aio_stat> |
1483 | Everywhere where a pathname is accepted by IO::AIO (e.g. in C<aio_stat> |
| 1290 | or C<aio_unlink>), one can specify an array reference with an IO::AIO::WD |
1484 | or C<aio_unlink>), one can specify an array reference with an IO::AIO::WD |
| 1291 | object and a pathname instead. If the pathname is absolute, the |
1485 | object and a pathname instead (or the IO::AIO::WD object alone, which |
|
|
1486 | gets interpreted as C<[$wd, "."]>). If the pathname is absolute, the |
| 1292 | IO::AIO::WD objetc is ignored, otherwise the pathname is resolved relative |
1487 | IO::AIO::WD object is ignored, otherwise the pathname is resolved relative |
| 1293 | to that IO::AIO::WD object. |
1488 | to that IO::AIO::WD object. |
| 1294 | |
1489 | |
| 1295 | For example, to get a wd object for F</etc> and then stat F<passwd> |
1490 | For example, to get a wd object for F</etc> and then stat F<passwd> |
| 1296 | inside, you would write: |
1491 | inside, you would write: |
| 1297 | |
1492 | |
| … | |
… | |
| 1305 | aio_stat [$etcdir, "passwd"], sub { |
1500 | aio_stat [$etcdir, "passwd"], sub { |
| 1306 | # yay |
1501 | # yay |
| 1307 | }; |
1502 | }; |
| 1308 | }; |
1503 | }; |
| 1309 | |
1504 | |
| 1310 | This shows that creating an IO::AIO::WD object is itself a potentially |
1505 | That C<aio_wd> is a request and not a normal function shows that creating |
| 1311 | blocking operation, which is why it is done asynchronously. |
1506 | an IO::AIO::WD object is itself a potentially blocking operation, which is |
|
|
1507 | why it is done asynchronously. |
|
|
1508 | |
|
|
1509 | To stat the directory obtained with C<aio_wd> above, one could write |
|
|
1510 | either of the following three request calls: |
|
|
1511 | |
|
|
1512 | aio_lstat "/etc" , sub { ... # pathname as normal string |
|
|
1513 | aio_lstat [$wd, "."], sub { ... # "." relative to $wd (i.e. $wd itself) |
|
|
1514 | aio_lstat $wd , sub { ... # shorthand for the previous |
| 1312 | |
1515 | |
| 1313 | As with normal pathnames, IO::AIO keeps a copy of the working directory |
1516 | As with normal pathnames, IO::AIO keeps a copy of the working directory |
| 1314 | object and the pathname string, so you could write the following without |
1517 | object and the pathname string, so you could write the following without |
| 1315 | causing any issues due to C<$path> getting reused: |
1518 | causing any issues due to C<$path> getting reused: |
| 1316 | |
1519 | |
| … | |
… | |
| 1329 | will still point to the original directory. Most functions accepting a |
1532 | will still point to the original directory. Most functions accepting a |
| 1330 | pathname will use the directory fd on newer systems, and the string on |
1533 | pathname will use the directory fd on newer systems, and the string on |
| 1331 | older systems. Some functions (such as realpath) will always rely on the |
1534 | older systems. Some functions (such as realpath) will always rely on the |
| 1332 | string form of the pathname. |
1535 | string form of the pathname. |
| 1333 | |
1536 | |
| 1334 | So this fucntionality is mainly useful to get some protection against |
1537 | So this functionality is mainly useful to get some protection against |
| 1335 | C<chdir>, to easily get an absolute path out of a relative path for future |
1538 | C<chdir>, to easily get an absolute path out of a relative path for future |
| 1336 | reference, and to speed up doing many operations in the same directory |
1539 | reference, and to speed up doing many operations in the same directory |
| 1337 | (e.g. when stat'ing all files in a directory). |
1540 | (e.g. when stat'ing all files in a directory). |
| 1338 | |
1541 | |
| 1339 | The following functions implement this working directory abstraction: |
1542 | The following functions implement this working directory abstraction: |
| … | |
… | |
| 1352 | passing C<undef> as working directory component of a pathname fails the |
1555 | passing C<undef> as working directory component of a pathname fails the |
| 1353 | request with C<ENOENT>, there is often no need for error checking in the |
1556 | request with C<ENOENT>, there is often no need for error checking in the |
| 1354 | C<aio_wd> callback, as future requests using the value will fail in the |
1557 | C<aio_wd> callback, as future requests using the value will fail in the |
| 1355 | expected way. |
1558 | expected way. |
| 1356 | |
1559 | |
| 1357 | If this call isn't available because your OS lacks it or it couldn't be |
|
|
| 1358 | detected, it will be emulated by calling C<fsync> instead. |
|
|
| 1359 | |
|
|
| 1360 | =item IO::AIO::CWD |
1560 | =item IO::AIO::CWD |
| 1361 | |
1561 | |
| 1362 | This is a compiletime constant (object) that represents the process |
1562 | This is a compiletime constant (object) that represents the process |
| 1363 | current working directory. |
1563 | current working directory. |
| 1364 | |
1564 | |
| 1365 | Specifying this object as working directory object for a pathname is as |
1565 | Specifying this object as working directory object for a pathname is as if |
| 1366 | if the pathname would be specified directly, without a directory object, |
1566 | the pathname would be specified directly, without a directory object. For |
| 1367 | e.g., these calls are functionally identical: |
1567 | example, these calls are functionally identical: |
| 1368 | |
1568 | |
| 1369 | aio_stat "somefile", sub { ... }; |
1569 | aio_stat "somefile", sub { ... }; |
| 1370 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
1570 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
| 1371 | |
1571 | |
| 1372 | =back |
1572 | =back |
| 1373 | |
1573 | |
|
|
1574 | To recover the path associated with an IO::AIO::WD object, you can use |
|
|
1575 | C<aio_realpath>: |
|
|
1576 | |
|
|
1577 | aio_realpath $wd, sub { |
|
|
1578 | warn "path is $_[0]\n"; |
|
|
1579 | }; |
|
|
1580 | |
|
|
1581 | Currently, C<aio_statvfs> always, and C<aio_rename> and C<aio_rmdir> |
|
|
1582 | sometimes, fall back to using an absolue path. |
| 1374 | |
1583 | |
| 1375 | =head2 IO::AIO::REQ CLASS |
1584 | =head2 IO::AIO::REQ CLASS |
| 1376 | |
1585 | |
| 1377 | All non-aggregate C<aio_*> functions return an object of this class when |
1586 | All non-aggregate C<aio_*> functions return an object of this class when |
| 1378 | called in non-void context. |
1587 | called in non-void context. |
| … | |
… | |
| 1496 | |
1705 | |
| 1497 | Sets a feeder/generator on this group: every group can have an attached |
1706 | Sets a feeder/generator on this group: every group can have an attached |
| 1498 | generator that generates requests if idle. The idea behind this is that, |
1707 | generator that generates requests if idle. The idea behind this is that, |
| 1499 | although you could just queue as many requests as you want in a group, |
1708 | although you could just queue as many requests as you want in a group, |
| 1500 | this might starve other requests for a potentially long time. For example, |
1709 | this might starve other requests for a potentially long time. For example, |
| 1501 | C<aio_scandir> might generate hundreds of thousands C<aio_stat> requests, |
1710 | C<aio_scandir> might generate hundreds of thousands of C<aio_stat> |
| 1502 | delaying any later requests for a long time. |
1711 | requests, delaying any later requests for a long time. |
| 1503 | |
1712 | |
| 1504 | To avoid this, and allow incremental generation of requests, you can |
1713 | To avoid this, and allow incremental generation of requests, you can |
| 1505 | instead a group and set a feeder on it that generates those requests. The |
1714 | instead a group and set a feeder on it that generates those requests. The |
| 1506 | feed callback will be called whenever there are few enough (see C<limit>, |
1715 | feed callback will be called whenever there are few enough (see C<limit>, |
| 1507 | below) requests active in the group itself and is expected to queue more |
1716 | below) requests active in the group itself and is expected to queue more |
| … | |
… | |
| 1556 | |
1765 | |
| 1557 | See C<poll_cb> for an example. |
1766 | See C<poll_cb> for an example. |
| 1558 | |
1767 | |
| 1559 | =item IO::AIO::poll_cb |
1768 | =item IO::AIO::poll_cb |
| 1560 | |
1769 | |
| 1561 | Process some outstanding events on the result pipe. You have to call |
1770 | Process some requests that have reached the result phase (i.e. they have |
|
|
1771 | been executed but the results are not yet reported). You have to call |
|
|
1772 | this "regularly" to finish outstanding requests. |
|
|
1773 | |
| 1562 | this regularly. Returns C<0> if all events could be processed (or there |
1774 | Returns C<0> if all events could be processed (or there were no |
| 1563 | were no events to process), or C<-1> if it returned earlier for whatever |
1775 | events to process), or C<-1> if it returned earlier for whatever |
| 1564 | reason. Returns immediately when no events are outstanding. The amount of |
1776 | reason. Returns immediately when no events are outstanding. The amount |
| 1565 | events processed depends on the settings of C<IO::AIO::max_poll_req> and |
1777 | of events processed depends on the settings of C<IO::AIO::max_poll_req>, |
| 1566 | C<IO::AIO::max_poll_time>. |
1778 | C<IO::AIO::max_poll_time> and C<IO::AIO::max_outstanding>. |
| 1567 | |
1779 | |
| 1568 | If not all requests were processed for whatever reason, the filehandle |
1780 | If not all requests were processed for whatever reason, the poll file |
| 1569 | will still be ready when C<poll_cb> returns, so normally you don't have to |
1781 | descriptor will still be ready when C<poll_cb> returns, so normally you |
| 1570 | do anything special to have it called later. |
1782 | don't have to do anything special to have it called later. |
| 1571 | |
1783 | |
| 1572 | Apart from calling C<IO::AIO::poll_cb> when the event filehandle becomes |
1784 | Apart from calling C<IO::AIO::poll_cb> when the event filehandle becomes |
| 1573 | ready, it can be beneficial to call this function from loops which submit |
1785 | ready, it can be beneficial to call this function from loops which submit |
| 1574 | a lot of requests, to make sure the results get processed when they become |
1786 | a lot of requests, to make sure the results get processed when they become |
| 1575 | available and not just when the loop is finished and the event loop takes |
1787 | available and not just when the loop is finished and the event loop takes |
| … | |
… | |
| 1584 | poll => 'r', async => 1, |
1796 | poll => 'r', async => 1, |
| 1585 | cb => \&IO::AIO::poll_cb); |
1797 | cb => \&IO::AIO::poll_cb); |
| 1586 | |
1798 | |
| 1587 | =item IO::AIO::poll_wait |
1799 | =item IO::AIO::poll_wait |
| 1588 | |
1800 | |
| 1589 | If there are any outstanding requests and none of them in the result |
1801 | Wait until either at least one request is in the result phase or no |
| 1590 | phase, wait till the result filehandle becomes ready for reading (simply |
1802 | requests are outstanding anymore. |
| 1591 | does a C<select> on the filehandle. This is useful if you want to |
1803 | |
| 1592 | synchronously wait for some requests to finish). |
1804 | This is useful if you want to synchronously wait for some requests to |
|
|
1805 | become ready, without actually handling them. |
| 1593 | |
1806 | |
| 1594 | See C<nreqs> for an example. |
1807 | See C<nreqs> for an example. |
| 1595 | |
1808 | |
| 1596 | =item IO::AIO::poll |
1809 | =item IO::AIO::poll |
| 1597 | |
1810 | |
| … | |
… | |
| 1718 | |
1931 | |
| 1719 | This is a very bad function to use in interactive programs because it |
1932 | This is a very bad function to use in interactive programs because it |
| 1720 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1933 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
| 1721 | use an C<aio_group> together with a feed callback. |
1934 | use an C<aio_group> together with a feed callback. |
| 1722 | |
1935 | |
| 1723 | It's main use is in scripts without an event loop - when you want to stat |
1936 | Its main use is in scripts without an event loop - when you want to stat |
| 1724 | a lot of files, you can write somehting like this: |
1937 | a lot of files, you can write somehting like this: |
| 1725 | |
1938 | |
| 1726 | IO::AIO::max_outstanding 32; |
1939 | IO::AIO::max_outstanding 32; |
| 1727 | |
1940 | |
| 1728 | for my $path (...) { |
1941 | for my $path (...) { |
| … | |
… | |
| 1768 | |
1981 | |
| 1769 | =back |
1982 | =back |
| 1770 | |
1983 | |
| 1771 | =head3 MISCELLANEOUS FUNCTIONS |
1984 | =head3 MISCELLANEOUS FUNCTIONS |
| 1772 | |
1985 | |
| 1773 | IO::AIO implements some functions that might be useful, but are not |
1986 | IO::AIO implements some functions that are useful when you want to use |
| 1774 | asynchronous. |
1987 | some "Advanced I/O" function not available to in Perl, without going the |
|
|
1988 | "Asynchronous I/O" route. Many of these have an asynchronous C<aio_*> |
|
|
1989 | counterpart. |
| 1775 | |
1990 | |
| 1776 | =over 4 |
1991 | =over 4 |
| 1777 | |
1992 | |
| 1778 | =item IO::AIO::sendfile $ofh, $ifh, $offset, $count |
1993 | =item IO::AIO::sendfile $ofh, $ifh, $offset, $count |
| 1779 | |
1994 | |
| … | |
… | |
| 1816 | ENOSYS, otherwise the return value of C<mprotect>. |
2031 | ENOSYS, otherwise the return value of C<mprotect>. |
| 1817 | |
2032 | |
| 1818 | =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
2033 | =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
| 1819 | |
2034 | |
| 1820 | Memory-maps a file (or anonymous memory range) and attaches it to the |
2035 | Memory-maps a file (or anonymous memory range) and attaches it to the |
| 1821 | given C<$scalar>, which will act like a string scalar. |
2036 | given C<$scalar>, which will act like a string scalar. Returns true on |
|
|
2037 | success, and false otherwise. |
| 1822 | |
2038 | |
| 1823 | The only operations allowed on the scalar are C<substr>/C<vec> that don't |
2039 | The only operations allowed on the scalar are C<substr>/C<vec> that don't |
| 1824 | change the string length, and most read-only operations such as copying it |
2040 | change the string length, and most read-only operations such as copying it |
| 1825 | or searching it with regexes and so on. |
2041 | or searching it with regexes and so on. |
| 1826 | |
2042 | |
| … | |
… | |
| 1879 | Calls the C<munlockall> function. |
2095 | Calls the C<munlockall> function. |
| 1880 | |
2096 | |
| 1881 | On systems that do not implement C<munlockall>, this function returns |
2097 | On systems that do not implement C<munlockall>, this function returns |
| 1882 | ENOSYS, otherwise the return value of C<munlockall>. |
2098 | ENOSYS, otherwise the return value of C<munlockall>. |
| 1883 | |
2099 | |
|
|
2100 | =item IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
|
|
2101 | |
|
|
2102 | Calls the GNU/Linux C<splice(2)> syscall, if available. If C<$r_off> or |
|
|
2103 | C<$w_off> are C<undef>, then C<NULL> is passed for these, otherwise they |
|
|
2104 | should be the file offset. |
|
|
2105 | |
|
|
2106 | C<$r_fh> and C<$w_fh> should not refer to the same file, as splice might |
|
|
2107 | silently corrupt the data in this case. |
|
|
2108 | |
|
|
2109 | The following symbol flag values are available: C<IO::AIO::SPLICE_F_MOVE>, |
|
|
2110 | C<IO::AIO::SPLICE_F_NONBLOCK>, C<IO::AIO::SPLICE_F_MORE> and |
|
|
2111 | C<IO::AIO::SPLICE_F_GIFT>. |
|
|
2112 | |
|
|
2113 | See the C<splice(2)> manpage for details. |
|
|
2114 | |
|
|
2115 | =item IO::AIO::tee $r_fh, $w_fh, $length, $flags |
|
|
2116 | |
|
|
2117 | Calls the GNU/Linux C<tee(2)> syscall, see its manpage and the |
|
|
2118 | description for C<IO::AIO::splice> above for details. |
|
|
2119 | |
|
|
2120 | =item $actual_size = IO::AIO::pipesize $r_fh[, $new_size] |
|
|
2121 | |
|
|
2122 | Attempts to query or change the pipe buffer size. Obviously works only |
|
|
2123 | on pipes, and currently works only on GNU/Linux systems, and fails with |
|
|
2124 | C<-1>/C<ENOSYS> everywhere else. If anybody knows how to influence pipe buffer |
|
|
2125 | size on other systems, drop me a note. |
|
|
2126 | |
| 1884 | =back |
2127 | =back |
| 1885 | |
2128 | |
| 1886 | =cut |
2129 | =cut |
| 1887 | |
2130 | |
| 1888 | min_parallel 8; |
2131 | min_parallel 8; |
