… | |
… | |
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 = '3.9'; |
172 | our $VERSION = '4.19'; |
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_sync aio_fsync |
176 | aio_scandir aio_symlink aio_readlink aio_realpath aio_sync |
178 | aio_fdatasync aio_sync_file_range aio_pathsync aio_readahead |
177 | aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range aio_allocate |
|
|
178 | aio_pathsync aio_readahead aio_fiemap |
179 | aio_rename aio_link aio_move aio_copy aio_group |
179 | aio_rename aio_link aio_move aio_copy aio_group |
180 | 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 |
181 | aio_chmod aio_utime aio_truncate |
181 | aio_chmod aio_utime aio_truncate |
182 | aio_msync aio_mtouch aio_mlock aio_mlockall |
182 | aio_msync aio_mtouch aio_mlock aio_mlockall |
183 | aio_statvfs); |
183 | aio_statvfs |
|
|
184 | aio_wd); |
184 | |
185 | |
185 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
186 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
186 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
187 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
187 | min_parallel max_parallel max_idle idle_timeout |
188 | min_parallel max_parallel max_idle idle_timeout |
188 | nreqs nready npending nthreads |
189 | nreqs nready npending nthreads |
… | |
… | |
200 | |
201 | |
201 | =head1 FUNCTIONS |
202 | =head1 FUNCTIONS |
202 | |
203 | |
203 | =head2 QUICK OVERVIEW |
204 | =head2 QUICK OVERVIEW |
204 | |
205 | |
205 | This section simply lists the prototypes of the most important functions |
206 | This section simply lists the prototypes most of the functions for |
206 | for quick reference. See the following sections for function-by-function |
207 | quick reference. See the following sections for function-by-function |
207 | documentation. |
208 | documentation. |
208 | |
209 | |
|
|
210 | aio_wd $pathname, $callback->($wd) |
209 | aio_open $pathname, $flags, $mode, $callback->($fh) |
211 | aio_open $pathname, $flags, $mode, $callback->($fh) |
210 | aio_close $fh, $callback->($status) |
212 | aio_close $fh, $callback->($status) |
|
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213 | aio_seek $fh,$offset,$whence, $callback->($offs) |
211 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
214 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
212 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
215 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
213 | aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
216 | aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
214 | aio_readahead $fh,$offset,$length, $callback->($retval) |
217 | aio_readahead $fh,$offset,$length, $callback->($retval) |
215 | aio_stat $fh_or_path, $callback->($status) |
218 | aio_stat $fh_or_path, $callback->($status) |
216 | aio_lstat $fh, $callback->($status) |
219 | aio_lstat $fh, $callback->($status) |
217 | aio_statvfs $fh_or_path, $callback->($statvfs) |
220 | aio_statvfs $fh_or_path, $callback->($statvfs) |
218 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
221 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
219 | 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) |
220 | aio_truncate $fh_or_path, $offset, $callback->($status) |
224 | aio_truncate $fh_or_path, $offset, $callback->($status) |
221 | 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) |
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) |
|
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232 | aio_realpath $pathname, $callback->($link) |
227 | aio_rename $srcpath, $dstpath, $callback->($status) |
233 | aio_rename $srcpath, $dstpath, $callback->($status) |
228 | aio_mkdir $pathname, $mode, $callback->($status) |
234 | aio_mkdir $pathname, $mode, $callback->($status) |
229 | aio_rmdir $pathname, $callback->($status) |
235 | aio_rmdir $pathname, $callback->($status) |
230 | aio_readdir $pathname, $callback->($entries) |
236 | aio_readdir $pathname, $callback->($entries) |
231 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
237 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
232 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
238 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
233 | 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) |
234 | aio_load $path, $data, $callback->($status) |
241 | aio_load $pathname, $data, $callback->($status) |
235 | aio_copy $srcpath, $dstpath, $callback->($status) |
242 | aio_copy $srcpath, $dstpath, $callback->($status) |
236 | aio_move $srcpath, $dstpath, $callback->($status) |
243 | aio_move $srcpath, $dstpath, $callback->($status) |
237 | aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
|
|
238 | aio_rmtree $path, $callback->($status) |
244 | aio_rmtree $pathname, $callback->($status) |
239 | aio_sync $callback->($status) |
245 | aio_sync $callback->($status) |
|
|
246 | aio_syncfs $fh, $callback->($status) |
240 | aio_fsync $fh, $callback->($status) |
247 | aio_fsync $fh, $callback->($status) |
241 | aio_fdatasync $fh, $callback->($status) |
248 | aio_fdatasync $fh, $callback->($status) |
242 | aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
249 | aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
243 | aio_pathsync $path, $callback->($status) |
250 | aio_pathsync $pathname, $callback->($status) |
244 | aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
251 | aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
245 | aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
252 | aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
246 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
253 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
247 | aio_mlockall $flags, $callback->($status) |
254 | aio_mlockall $flags, $callback->($status) |
248 | aio_group $callback->(...) |
255 | aio_group $callback->(...) |
… | |
… | |
266 | IO::AIO::nready |
273 | IO::AIO::nready |
267 | IO::AIO::npending |
274 | IO::AIO::npending |
268 | |
275 | |
269 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
276 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
270 | 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 |
271 | IO::AIO::madvise $scalar, $offset, $length, $advice |
280 | IO::AIO::madvise $scalar, $offset, $length, $advice |
272 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
281 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
273 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
282 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
274 | IO::AIO::munlockall |
283 | IO::AIO::munlockall |
275 | |
284 | |
276 | =head2 AIO REQUEST FUNCTIONS |
285 | =head2 API NOTES |
277 | |
286 | |
278 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
287 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
279 | with the same name (sans C<aio_>). The arguments are similar or identical, |
288 | with the same name (sans C<aio_>). The arguments are similar or identical, |
280 | and they all accept an additional (and optional) C<$callback> argument |
289 | and they all accept an additional (and optional) C<$callback> argument |
281 | which must be a code reference. This code reference will get called with |
290 | which must be a code reference. This code reference will be called after |
282 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
291 | the syscall has been executed in an asynchronous fashion. The results |
283 | perl, which usually delivers "false") as its sole argument after the given |
292 | of the request will be passed as arguments to the callback (and, if an |
284 | syscall has been executed asynchronously. |
293 | error occured, in C<$!>) - for most requests the syscall return code (e.g. |
|
|
294 | most syscalls return C<-1> on error, unlike perl, which usually delivers |
|
|
295 | "false"). |
|
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296 | |
|
|
297 | Some requests (such as C<aio_readdir>) pass the actual results and |
|
|
298 | communicate failures by passing C<undef>. |
285 | |
299 | |
286 | All functions expecting a filehandle keep a copy of the filehandle |
300 | All functions expecting a filehandle keep a copy of the filehandle |
287 | internally until the request has finished. |
301 | internally until the request has finished. |
288 | |
302 | |
289 | 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 |
290 | further manipulation of those requests while they are in-flight. |
304 | further manipulation of those requests while they are in-flight. |
291 | |
305 | |
292 | 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 |
293 | 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 |
294 | request is being executed, the current working directory could have |
308 | current working directory could have changed. Alternatively, you can |
295 | changed. Alternatively, you can make sure that you never change the |
309 | make sure that you never change the current working directory anywhere |
296 | 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 |
297 | paths. |
311 | of IO::AIOs working directory abstraction, that lets you specify paths |
|
|
312 | relative to some previously-opened "working directory object" - see the |
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313 | description of the C<IO::AIO::WD> class later in this document. |
298 | |
314 | |
299 | 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 |
300 | in filenames you got from outside (command line, readdir etc.) without |
316 | in filenames you got from outside (command line, readdir etc.) without |
301 | 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 |
302 | 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 |
303 | 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 |
304 | 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 |
|
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321 | correct contents. |
305 | |
322 | |
306 | 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 |
307 | handles correctly whether it is set or not. |
324 | handles correctly whether it is set or not. |
|
|
325 | |
|
|
326 | =head2 AIO REQUEST FUNCTIONS |
308 | |
327 | |
309 | =over 4 |
328 | =over 4 |
310 | |
329 | |
311 | =item $prev_pri = aioreq_pri [$pri] |
330 | =item $prev_pri = aioreq_pri [$pri] |
312 | |
331 | |
… | |
… | |
342 | |
361 | |
343 | |
362 | |
344 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
363 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
345 | |
364 | |
346 | 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 |
347 | created filehandle for the file. |
366 | created filehandle for the file (or C<undef> in case of an error). |
348 | |
367 | |
349 | 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, |
350 | for an explanation. |
369 | for an explanation. |
351 | |
370 | |
352 | 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 |
… | |
… | |
394 | |
413 | |
395 | 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 |
396 | free for reuse until the perl filehandle is closed. |
415 | free for reuse until the perl filehandle is closed. |
397 | |
416 | |
398 | =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 |
|
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424 | C<IO::AIO::SEEK_END>). |
|
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425 | |
|
|
426 | The resulting absolute offset will be passed to the callback, or C<-1> in |
|
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427 | case of an error. |
|
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428 | |
|
|
429 | In theory, the C<$whence> constants could be different than the |
|
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430 | corresponding values from L<Fcntl>, but perl guarantees they are the same, |
|
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431 | so don't panic. |
|
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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 |
|
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435 | could be found. No guarantees about suitability for use in C<aio_seek> or |
|
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436 | Perl's C<sysseek> can be made though, although I would naively assume they |
|
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437 | "just work". |
399 | |
438 | |
400 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
439 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
401 | |
440 | |
402 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
441 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
403 | |
442 | |
… | |
… | |
563 | namemax => 255, |
602 | namemax => 255, |
564 | frsize => 1024, |
603 | frsize => 1024, |
565 | fsid => 1810 |
604 | fsid => 1810 |
566 | } |
605 | } |
567 | |
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>: |
|
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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 |
568 | |
688 | |
569 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
689 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
570 | |
690 | |
571 | 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 |
572 | and $mtime being undef). Fractional times are supported if the underlying |
692 | and $mtime being undef). Fractional times are supported if the underlying |
… | |
… | |
600 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
720 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
601 | |
721 | |
602 | Works like truncate(2) or ftruncate(2). |
722 | Works like truncate(2) or ftruncate(2). |
603 | |
723 | |
604 | |
724 | |
|
|
725 | =item aio_allocate $fh, $mode, $offset, $len, $callback->($status) |
|
|
726 | |
|
|
727 | Allocates or freed disk space according to the C<$mode> argument. See the |
|
|
728 | linux C<fallocate> docuemntation for details. |
|
|
729 | |
|
|
730 | C<$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 | |
605 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
741 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
606 | |
742 | |
607 | Works like perl's C<chmod> function. |
743 | Works like perl's C<chmod> function. |
608 | |
744 | |
609 | |
745 | |
… | |
… | |
611 | |
747 | |
612 | Asynchronously unlink (delete) a file and call the callback with the |
748 | Asynchronously unlink (delete) a file and call the callback with the |
613 | result code. |
749 | result code. |
614 | |
750 | |
615 | |
751 | |
616 | =item aio_mknod $path, $mode, $dev, $callback->($status) |
752 | =item aio_mknod $pathname, $mode, $dev, $callback->($status) |
617 | |
753 | |
618 | [EXPERIMENTAL] |
754 | [EXPERIMENTAL] |
619 | |
755 | |
620 | Asynchronously create a device node (or fifo). See mknod(2). |
756 | Asynchronously create a device node (or fifo). See mknod(2). |
621 | |
757 | |
622 | The only (POSIX-) portable way of calling this function is: |
758 | The only (POSIX-) portable way of calling this function is: |
623 | |
759 | |
624 | aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
760 | aio_mknod $pathname, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
625 | |
761 | |
626 | See C<aio_stat> for info about some potentially helpful extra constants |
762 | See C<aio_stat> for info about some potentially helpful extra constants |
627 | and functions. |
763 | and functions. |
628 | |
764 | |
629 | =item aio_link $srcpath, $dstpath, $callback->($status) |
765 | =item aio_link $srcpath, $dstpath, $callback->($status) |
… | |
… | |
636 | |
772 | |
637 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
773 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
638 | the path C<$dstpath> and call the callback with the result code. |
774 | the path C<$dstpath> and call the callback with the result code. |
639 | |
775 | |
640 | |
776 | |
641 | =item aio_readlink $path, $callback->($link) |
777 | =item aio_readlink $pathname, $callback->($link) |
642 | |
778 | |
643 | Asynchronously read the symlink specified by C<$path> and pass it to |
779 | Asynchronously read the symlink specified by C<$path> and pass it to |
644 | the callback. If an error occurs, nothing or undef gets passed to the |
780 | the callback. If an error occurs, nothing or undef gets passed to the |
645 | callback. |
781 | callback. |
646 | |
782 | |
647 | |
783 | |
|
|
784 | =item aio_realpath $pathname, $callback->($path) |
|
|
785 | |
|
|
786 | Asynchronously make the path absolute and resolve any symlinks in |
|
|
787 | C<$path>. The resulting path only consists of directories (same as |
|
|
788 | L<Cwd::realpath>). |
|
|
789 | |
|
|
790 | This request can be used to get the absolute path of the current working |
|
|
791 | directory by passing it a path of F<.> (a single dot). |
|
|
792 | |
|
|
793 | |
648 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
794 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
649 | |
795 | |
650 | 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 |
651 | 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>. |
652 | |
802 | |
653 | |
803 | |
654 | =item aio_mkdir $pathname, $mode, $callback->($status) |
804 | =item aio_mkdir $pathname, $mode, $callback->($status) |
655 | |
805 | |
656 | Asynchronously mkdir (create) a directory and call the callback with |
806 | Asynchronously mkdir (create) a directory and call the callback with |
… | |
… | |
661 | =item aio_rmdir $pathname, $callback->($status) |
811 | =item aio_rmdir $pathname, $callback->($status) |
662 | |
812 | |
663 | Asynchronously rmdir (delete) a directory and call the callback with the |
813 | Asynchronously rmdir (delete) a directory and call the callback with the |
664 | result code. |
814 | result code. |
665 | |
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>. |
|
|
819 | |
666 | |
820 | |
667 | =item aio_readdir $pathname, $callback->($entries) |
821 | =item aio_readdir $pathname, $callback->($entries) |
668 | |
822 | |
669 | 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 |
670 | directory (i.e. opendir + readdir + closedir). The entries will not be |
824 | directory (i.e. opendir + readdir + closedir). The entries will not be |
… | |
… | |
674 | array-ref with the filenames. |
828 | array-ref with the filenames. |
675 | |
829 | |
676 | |
830 | |
677 | =item aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
831 | =item aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
678 | |
832 | |
679 | Quite similar to C<aio_readdir>, but the C<$flags> argument allows to tune |
833 | Quite similar to C<aio_readdir>, but the C<$flags> argument allows one to |
680 | behaviour and output format. In case of an error, C<$entries> will be |
834 | tune behaviour and output format. In case of an error, C<$entries> will be |
681 | C<undef>. |
835 | C<undef>. |
682 | |
836 | |
683 | The flags are a combination of the following constants, ORed together (the |
837 | The flags are a combination of the following constants, ORed together (the |
684 | flags will also be passed to the callback, possibly modified): |
838 | flags will also be passed to the callback, possibly modified): |
685 | |
839 | |
… | |
… | |
732 | |
886 | |
733 | =item IO::AIO::READDIR_FOUND_UNKNOWN |
887 | =item IO::AIO::READDIR_FOUND_UNKNOWN |
734 | |
888 | |
735 | This flag should not be set when calling C<aio_readdirx>. Instead, it |
889 | This flag should not be set when calling C<aio_readdirx>. Instead, it |
736 | is being set by C<aio_readdirx>, when any of the C<$type>'s found were |
890 | is being set by C<aio_readdirx>, when any of the C<$type>'s found were |
737 | C<IO::AIO::DT_UNKNOWN>. The absense of this flag therefore indicates that all |
891 | C<IO::AIO::DT_UNKNOWN>. The absence of this flag therefore indicates that all |
738 | C<$type>'s are known, which can be used to speed up some algorithms. |
892 | C<$type>'s are known, which can be used to speed up some algorithms. |
739 | |
893 | |
740 | =back |
894 | =back |
741 | |
895 | |
742 | |
896 | |
743 | =item aio_load $path, $data, $callback->($status) |
897 | =item aio_load $pathname, $data, $callback->($status) |
744 | |
898 | |
745 | This is a composite request that tries to fully load the given file into |
899 | This is a composite request that tries to fully load the given file into |
746 | memory. Status is the same as with aio_read. |
900 | memory. Status is the same as with aio_read. |
747 | |
901 | |
748 | =cut |
902 | =cut |
… | |
… | |
883 | }; |
1037 | }; |
884 | |
1038 | |
885 | $grp |
1039 | $grp |
886 | } |
1040 | } |
887 | |
1041 | |
888 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
1042 | =item aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs) |
889 | |
1043 | |
890 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
1044 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
891 | efficiently separate the entries of directory C<$path> into two sets of |
1045 | efficiently separate the entries of directory C<$path> into two sets of |
892 | names, directories you can recurse into (directories), and ones you cannot |
1046 | names, directories you can recurse into (directories), and ones you cannot |
893 | recurse into (everything else, including symlinks to directories). |
1047 | recurse into (everything else, including symlinks to directories). |
… | |
… | |
924 | Then entries will be sorted into likely directories a non-initial dot |
1078 | Then entries will be sorted into likely directories a non-initial dot |
925 | currently) and likely non-directories (see C<aio_readdirx>). Then every |
1079 | currently) and likely non-directories (see C<aio_readdirx>). Then every |
926 | entry plus an appended C</.> will be C<stat>'ed, likely directories first, |
1080 | entry plus an appended C</.> will be C<stat>'ed, likely directories first, |
927 | in order of their inode numbers. If that succeeds, it assumes that the |
1081 | in order of their inode numbers. If that succeeds, it assumes that the |
928 | entry is a directory or a symlink to directory (which will be checked |
1082 | entry is a directory or a symlink to directory (which will be checked |
929 | seperately). This is often faster than stat'ing the entry itself because |
1083 | separately). This is often faster than stat'ing the entry itself because |
930 | filesystems might detect the type of the entry without reading the inode |
1084 | filesystems might detect the type of the entry without reading the inode |
931 | data (e.g. ext2fs filetype feature), even on systems that cannot return |
1085 | data (e.g. ext2fs filetype feature), even on systems that cannot return |
932 | the filetype information on readdir. |
1086 | the filetype information on readdir. |
933 | |
1087 | |
934 | If the known number of directories (link count - 2) has been reached, the |
1088 | If the known number of directories (link count - 2) has been reached, the |
… | |
… | |
950 | |
1104 | |
951 | my $grp = aio_group $cb; |
1105 | my $grp = aio_group $cb; |
952 | |
1106 | |
953 | $maxreq = 4 if $maxreq <= 0; |
1107 | $maxreq = 4 if $maxreq <= 0; |
954 | |
1108 | |
955 | # stat once |
1109 | # get a wd object |
956 | aioreq_pri $pri; |
1110 | aioreq_pri $pri; |
957 | add $grp aio_stat $path, sub { |
1111 | add $grp aio_wd $path, sub { |
|
|
1112 | $_[0] |
958 | return $grp->result () if $_[0]; |
1113 | or return $grp->result (); |
959 | my $now = time; |
|
|
960 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
961 | |
1114 | |
962 | # read the directory entries |
1115 | my $wd = [shift, "."]; |
|
|
1116 | |
|
|
1117 | # stat once |
963 | aioreq_pri $pri; |
1118 | aioreq_pri $pri; |
964 | add $grp aio_readdirx $path, READDIR_DIRS_FIRST, sub { |
1119 | add $grp aio_stat $wd, sub { |
965 | my $entries = shift |
|
|
966 | or return $grp->result (); |
1120 | return $grp->result () if $_[0]; |
|
|
1121 | my $now = time; |
|
|
1122 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
967 | |
1123 | |
968 | # stat the dir another time |
1124 | # read the directory entries |
969 | 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; |
970 | add $grp aio_stat $path, sub { |
1132 | add $grp aio_stat $wd, sub { |
971 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
1133 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
972 | |
1134 | |
973 | my $ndirs; |
1135 | my $ndirs; |
974 | |
1136 | |
975 | # take the slow route if anything looks fishy |
1137 | # take the slow route if anything looks fishy |
976 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
1138 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
977 | $ndirs = -1; |
1139 | $ndirs = -1; |
978 | } else { |
1140 | } else { |
979 | # if nlink == 2, we are finished |
1141 | # if nlink == 2, we are finished |
980 | # for non-posix-fs's, we rely on nlink < 2 |
1142 | # for non-posix-fs's, we rely on nlink < 2 |
981 | $ndirs = (stat _)[3] - 2 |
1143 | $ndirs = (stat _)[3] - 2 |
982 | or return $grp->result ([], $entries); |
1144 | or return $grp->result ([], $entries); |
983 | } |
1145 | } |
984 | |
1146 | |
985 | my (@dirs, @nondirs); |
1147 | my (@dirs, @nondirs); |
986 | |
1148 | |
987 | my $statgrp = add $grp aio_group sub { |
1149 | my $statgrp = add $grp aio_group sub { |
988 | $grp->result (\@dirs, \@nondirs); |
1150 | $grp->result (\@dirs, \@nondirs); |
989 | }; |
1151 | }; |
990 | |
1152 | |
991 | limit $statgrp $maxreq; |
1153 | limit $statgrp $maxreq; |
992 | feed $statgrp sub { |
1154 | feed $statgrp sub { |
993 | return unless @$entries; |
1155 | return unless @$entries; |
994 | my $entry = shift @$entries; |
1156 | my $entry = shift @$entries; |
995 | |
1157 | |
996 | aioreq_pri $pri; |
1158 | aioreq_pri $pri; |
|
|
1159 | $wd->[1] = "$entry/."; |
997 | add $statgrp aio_stat "$path/$entry/.", sub { |
1160 | add $statgrp aio_stat $wd, sub { |
998 | if ($_[0] < 0) { |
1161 | if ($_[0] < 0) { |
999 | push @nondirs, $entry; |
1162 | push @nondirs, $entry; |
1000 | } else { |
1163 | } else { |
1001 | # need to check for real directory |
1164 | # need to check for real directory |
1002 | aioreq_pri $pri; |
1165 | aioreq_pri $pri; |
|
|
1166 | $wd->[1] = $entry; |
1003 | add $statgrp aio_lstat "$path/$entry", sub { |
1167 | add $statgrp aio_lstat $wd, sub { |
1004 | if (-d _) { |
1168 | if (-d _) { |
1005 | push @dirs, $entry; |
1169 | push @dirs, $entry; |
1006 | |
1170 | |
1007 | unless (--$ndirs) { |
1171 | unless (--$ndirs) { |
1008 | push @nondirs, @$entries; |
1172 | push @nondirs, @$entries; |
1009 | feed $statgrp; |
1173 | feed $statgrp; |
|
|
1174 | } |
|
|
1175 | } else { |
|
|
1176 | push @nondirs, $entry; |
1010 | } |
1177 | } |
1011 | } else { |
|
|
1012 | push @nondirs, $entry; |
|
|
1013 | } |
1178 | } |
1014 | } |
1179 | } |
1015 | } |
1180 | }; |
1016 | }; |
1181 | }; |
1017 | }; |
1182 | }; |
1018 | }; |
1183 | }; |
1019 | }; |
1184 | }; |
1020 | }; |
1185 | }; |
1021 | |
1186 | |
1022 | $grp |
1187 | $grp |
1023 | } |
1188 | } |
1024 | |
1189 | |
1025 | =item aio_rmtree $path, $callback->($status) |
1190 | =item aio_rmtree $pathname, $callback->($status) |
1026 | |
1191 | |
1027 | Delete a directory tree starting (and including) C<$path>, return the |
1192 | Delete a directory tree starting (and including) C<$path>, return the |
1028 | 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 |
1029 | 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 |
1030 | everything else. |
1195 | everything else. |
1031 | |
1196 | |
1032 | =cut |
1197 | =cut |
1033 | |
1198 | |
… | |
… | |
1072 | callback with the fdatasync result code. |
1237 | callback with the fdatasync result code. |
1073 | |
1238 | |
1074 | If this call isn't available because your OS lacks it or it couldn't be |
1239 | If this call isn't available because your OS lacks it or it couldn't be |
1075 | detected, it will be emulated by calling C<fsync> instead. |
1240 | detected, it will be emulated by calling C<fsync> instead. |
1076 | |
1241 | |
|
|
1242 | =item aio_syncfs $fh, $callback->($status) |
|
|
1243 | |
|
|
1244 | Asynchronously call the syncfs syscall to sync the filesystem associated |
|
|
1245 | to the given filehandle and call the callback with the syncfs result |
|
|
1246 | code. If syncfs is not available, calls sync(), but returns C<-1> and sets |
|
|
1247 | errno to C<ENOSYS> nevertheless. |
|
|
1248 | |
1077 | =item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
1249 | =item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
1078 | |
1250 | |
1079 | Sync the data portion of the file specified by C<$offset> and C<$length> |
1251 | Sync the data portion of the file specified by C<$offset> and C<$length> |
1080 | to disk (but NOT the metadata), by calling the Linux-specific |
1252 | to disk (but NOT the metadata), by calling the Linux-specific |
1081 | sync_file_range call. If sync_file_range is not available or it returns |
1253 | sync_file_range call. If sync_file_range is not available or it returns |
… | |
… | |
1084 | C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>, |
1256 | C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>, |
1085 | C<IO::AIO::SYNC_FILE_RANGE_WRITE> and |
1257 | C<IO::AIO::SYNC_FILE_RANGE_WRITE> and |
1086 | C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range |
1258 | C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range |
1087 | manpage for details. |
1259 | manpage for details. |
1088 | |
1260 | |
1089 | =item aio_pathsync $path, $callback->($status) |
1261 | =item aio_pathsync $pathname, $callback->($status) |
1090 | |
1262 | |
1091 | This request tries to open, fsync and close the given path. This is a |
1263 | This request tries to open, fsync and close the given path. This is a |
1092 | composite request intended to sync directories after directory operations |
1264 | composite request intended to sync directories after directory operations |
1093 | (E.g. rename). This might not work on all operating systems or have any |
1265 | (E.g. rename). This might not work on all operating systems or have any |
1094 | specific effect, but usually it makes sure that directory changes get |
1266 | specific effect, but usually it makes sure that directory changes get |
… | |
… | |
1146 | |
1318 | |
1147 | 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 |
1148 | scalars. |
1320 | scalars. |
1149 | |
1321 | |
1150 | It touches (reads or writes) all memory pages in the specified |
1322 | It touches (reads or writes) all memory pages in the specified |
1151 | range inside the scalar. All caveats and parameters are the same |
1323 | range inside the scalar. All caveats and parameters are the same |
1152 | 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 |
1153 | 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 |
1154 | 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 |
1155 | writing an octet from it, which dirties the page). |
1327 | writing an octet from it, which dirties the page). |
1156 | |
1328 | |
1157 | =item aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
1329 | =item aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
1158 | |
1330 | |
1159 | 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 |
… | |
… | |
1190 | documented under L<MISCELLANEOUS FUNCTIONS>. |
1362 | documented under L<MISCELLANEOUS FUNCTIONS>. |
1191 | |
1363 | |
1192 | Example: asynchronously lock all current and future pages into memory. |
1364 | Example: asynchronously lock all current and future pages into memory. |
1193 | |
1365 | |
1194 | 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. |
1195 | |
1412 | |
1196 | =item aio_group $callback->(...) |
1413 | =item aio_group $callback->(...) |
1197 | |
1414 | |
1198 | 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 |
1199 | 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 |
… | |
… | |
1236 | like sleep and file handle readable/writable, the overhead this creates is |
1453 | like sleep and file handle readable/writable, the overhead this creates is |
1237 | immense (it blocks a thread for a long time) so do not use this function |
1454 | immense (it blocks a thread for a long time) so do not use this function |
1238 | except to put your application under artificial I/O pressure. |
1455 | except to put your application under artificial I/O pressure. |
1239 | |
1456 | |
1240 | =back |
1457 | =back |
|
|
1458 | |
|
|
1459 | |
|
|
1460 | =head2 IO::AIO::WD - multiple working directories |
|
|
1461 | |
|
|
1462 | Your process only has one current working directory, which is used by all |
|
|
1463 | threads. This makes it hard to use relative paths (some other component |
|
|
1464 | could call C<chdir> at any time, and it is hard to control when the path |
|
|
1465 | will be used by IO::AIO). |
|
|
1466 | |
|
|
1467 | One solution for this is to always use absolute paths. This usually works, |
|
|
1468 | but can be quite slow (the kernel has to walk the whole path on every |
|
|
1469 | access), and can also be a hassle to implement. |
|
|
1470 | |
|
|
1471 | Newer POSIX systems have a number of functions (openat, fdopendir, |
|
|
1472 | futimensat and so on) that make it possible to specify working directories |
|
|
1473 | per operation. |
|
|
1474 | |
|
|
1475 | For portability, and because the clowns who "designed", or shall I write, |
|
|
1476 | perpetrated this new interface were obviously half-drunk, this abstraction |
|
|
1477 | cannot be perfect, though. |
|
|
1478 | |
|
|
1479 | IO::AIO allows you to convert directory paths into a so-called IO::AIO::WD |
|
|
1480 | object. This object stores the canonicalised, absolute version of the |
|
|
1481 | path, and on systems that allow it, also a directory file descriptor. |
|
|
1482 | |
|
|
1483 | Everywhere where a pathname is accepted by IO::AIO (e.g. in C<aio_stat> |
|
|
1484 | or C<aio_unlink>), one can specify an array reference with an IO::AIO::WD |
|
|
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 |
|
|
1487 | IO::AIO::WD object is ignored, otherwise the pathname is resolved relative |
|
|
1488 | to that IO::AIO::WD object. |
|
|
1489 | |
|
|
1490 | For example, to get a wd object for F</etc> and then stat F<passwd> |
|
|
1491 | inside, you would write: |
|
|
1492 | |
|
|
1493 | aio_wd "/etc", sub { |
|
|
1494 | my $etcdir = shift; |
|
|
1495 | |
|
|
1496 | # although $etcdir can be undef on error, there is generally no reason |
|
|
1497 | # to check for errors here, as aio_stat will fail with ENOENT |
|
|
1498 | # when $etcdir is undef. |
|
|
1499 | |
|
|
1500 | aio_stat [$etcdir, "passwd"], sub { |
|
|
1501 | # yay |
|
|
1502 | }; |
|
|
1503 | }; |
|
|
1504 | |
|
|
1505 | That C<aio_wd> is a request and not a normal function shows that creating |
|
|
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 $wd , sub { ... # shorthand for the previous |
|
|
1515 | |
|
|
1516 | As with normal pathnames, IO::AIO keeps a copy of the working directory |
|
|
1517 | object and the pathname string, so you could write the following without |
|
|
1518 | causing any issues due to C<$path> getting reused: |
|
|
1519 | |
|
|
1520 | my $path = [$wd, undef]; |
|
|
1521 | |
|
|
1522 | for my $name (qw(abc def ghi)) { |
|
|
1523 | $path->[1] = $name; |
|
|
1524 | aio_stat $path, sub { |
|
|
1525 | # ... |
|
|
1526 | }; |
|
|
1527 | } |
|
|
1528 | |
|
|
1529 | There are some caveats: when directories get renamed (or deleted), the |
|
|
1530 | pathname string doesn't change, so will point to the new directory (or |
|
|
1531 | nowhere at all), while the directory fd, if available on the system, |
|
|
1532 | will still point to the original directory. Most functions accepting a |
|
|
1533 | pathname will use the directory fd on newer systems, and the string on |
|
|
1534 | older systems. Some functions (such as realpath) will always rely on the |
|
|
1535 | string form of the pathname. |
|
|
1536 | |
|
|
1537 | So this functionality is mainly useful to get some protection against |
|
|
1538 | C<chdir>, to easily get an absolute path out of a relative path for future |
|
|
1539 | reference, and to speed up doing many operations in the same directory |
|
|
1540 | (e.g. when stat'ing all files in a directory). |
|
|
1541 | |
|
|
1542 | The following functions implement this working directory abstraction: |
|
|
1543 | |
|
|
1544 | =over 4 |
|
|
1545 | |
|
|
1546 | =item aio_wd $pathname, $callback->($wd) |
|
|
1547 | |
|
|
1548 | Asynchonously canonicalise the given pathname and convert it to an |
|
|
1549 | IO::AIO::WD object representing it. If possible and supported on the |
|
|
1550 | system, also open a directory fd to speed up pathname resolution relative |
|
|
1551 | to this working directory. |
|
|
1552 | |
|
|
1553 | If something goes wrong, then C<undef> is passwd to the callback instead |
|
|
1554 | of a working directory object and C<$!> is set appropriately. Since |
|
|
1555 | passing C<undef> as working directory component of a pathname fails the |
|
|
1556 | request with C<ENOENT>, there is often no need for error checking in the |
|
|
1557 | C<aio_wd> callback, as future requests using the value will fail in the |
|
|
1558 | expected way. |
|
|
1559 | |
|
|
1560 | If this call isn't available because your OS lacks it or it couldn't be |
|
|
1561 | detected, it will be emulated by calling C<fsync> instead. |
|
|
1562 | |
|
|
1563 | =item IO::AIO::CWD |
|
|
1564 | |
|
|
1565 | This is a compiletime constant (object) that represents the process |
|
|
1566 | current working directory. |
|
|
1567 | |
|
|
1568 | Specifying this object as working directory object for a pathname is as if |
|
|
1569 | the pathname would be specified directly, without a directory object. For |
|
|
1570 | example, these calls are functionally identical: |
|
|
1571 | |
|
|
1572 | aio_stat "somefile", sub { ... }; |
|
|
1573 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
|
|
1574 | |
|
|
1575 | =back |
|
|
1576 | |
|
|
1577 | To recover the path associated with an IO::AIO::WD object, you can use |
|
|
1578 | C<aio_realpath>: |
|
|
1579 | |
|
|
1580 | aio_realpath $wd, sub { |
|
|
1581 | warn "path is $_[0]\n"; |
|
|
1582 | }; |
|
|
1583 | |
|
|
1584 | Currently, C<aio_statvfs> always, and C<aio_rename> and C<aio_rmdir> |
|
|
1585 | sometimes, fall back to using an absolue path. |
1241 | |
1586 | |
1242 | =head2 IO::AIO::REQ CLASS |
1587 | =head2 IO::AIO::REQ CLASS |
1243 | |
1588 | |
1244 | All non-aggregate C<aio_*> functions return an object of this class when |
1589 | All non-aggregate C<aio_*> functions return an object of this class when |
1245 | called in non-void context. |
1590 | called in non-void context. |
… | |
… | |
1363 | |
1708 | |
1364 | Sets a feeder/generator on this group: every group can have an attached |
1709 | Sets a feeder/generator on this group: every group can have an attached |
1365 | generator that generates requests if idle. The idea behind this is that, |
1710 | generator that generates requests if idle. The idea behind this is that, |
1366 | although you could just queue as many requests as you want in a group, |
1711 | although you could just queue as many requests as you want in a group, |
1367 | this might starve other requests for a potentially long time. For example, |
1712 | this might starve other requests for a potentially long time. For example, |
1368 | C<aio_scandir> might generate hundreds of thousands C<aio_stat> requests, |
1713 | C<aio_scandir> might generate hundreds of thousands of C<aio_stat> |
1369 | delaying any later requests for a long time. |
1714 | requests, delaying any later requests for a long time. |
1370 | |
1715 | |
1371 | To avoid this, and allow incremental generation of requests, you can |
1716 | To avoid this, and allow incremental generation of requests, you can |
1372 | instead a group and set a feeder on it that generates those requests. The |
1717 | instead a group and set a feeder on it that generates those requests. The |
1373 | feed callback will be called whenever there are few enough (see C<limit>, |
1718 | feed callback will be called whenever there are few enough (see C<limit>, |
1374 | below) requests active in the group itself and is expected to queue more |
1719 | below) requests active in the group itself and is expected to queue more |
… | |
… | |
1423 | |
1768 | |
1424 | See C<poll_cb> for an example. |
1769 | See C<poll_cb> for an example. |
1425 | |
1770 | |
1426 | =item IO::AIO::poll_cb |
1771 | =item IO::AIO::poll_cb |
1427 | |
1772 | |
1428 | Process some outstanding events on the result pipe. You have to call |
1773 | Process some requests that have reached the result phase (i.e. they have |
|
|
1774 | been executed but the results are not yet reported). You have to call |
|
|
1775 | this "regularly" to finish outstanding requests. |
|
|
1776 | |
1429 | this regularly. Returns C<0> if all events could be processed (or there |
1777 | Returns C<0> if all events could be processed (or there were no |
1430 | were no events to process), or C<-1> if it returned earlier for whatever |
1778 | events to process), or C<-1> if it returned earlier for whatever |
1431 | reason. Returns immediately when no events are outstanding. The amount of |
1779 | reason. Returns immediately when no events are outstanding. The amount |
1432 | events processed depends on the settings of C<IO::AIO::max_poll_req> and |
1780 | of events processed depends on the settings of C<IO::AIO::max_poll_req>, |
1433 | C<IO::AIO::max_poll_time>. |
1781 | C<IO::AIO::max_poll_time> and C<IO::AIO::max_outstanding>. |
1434 | |
1782 | |
1435 | If not all requests were processed for whatever reason, the filehandle |
1783 | If not all requests were processed for whatever reason, the poll file |
1436 | will still be ready when C<poll_cb> returns, so normally you don't have to |
1784 | descriptor will still be ready when C<poll_cb> returns, so normally you |
1437 | do anything special to have it called later. |
1785 | don't have to do anything special to have it called later. |
1438 | |
1786 | |
1439 | Apart from calling C<IO::AIO::poll_cb> when the event filehandle becomes |
1787 | Apart from calling C<IO::AIO::poll_cb> when the event filehandle becomes |
1440 | ready, it can be beneficial to call this function from loops which submit |
1788 | ready, it can be beneficial to call this function from loops which submit |
1441 | a lot of requests, to make sure the results get processed when they become |
1789 | a lot of requests, to make sure the results get processed when they become |
1442 | available and not just when the loop is finished and the event loop takes |
1790 | available and not just when the loop is finished and the event loop takes |
… | |
… | |
1451 | poll => 'r', async => 1, |
1799 | poll => 'r', async => 1, |
1452 | cb => \&IO::AIO::poll_cb); |
1800 | cb => \&IO::AIO::poll_cb); |
1453 | |
1801 | |
1454 | =item IO::AIO::poll_wait |
1802 | =item IO::AIO::poll_wait |
1455 | |
1803 | |
1456 | If there are any outstanding requests and none of them in the result |
1804 | Wait until either at least one request is in the result phase or no |
1457 | phase, wait till the result filehandle becomes ready for reading (simply |
1805 | requests are outstanding anymore. |
1458 | does a C<select> on the filehandle. This is useful if you want to |
1806 | |
1459 | synchronously wait for some requests to finish). |
1807 | This is useful if you want to synchronously wait for some requests to |
|
|
1808 | become ready, without actually handling them. |
1460 | |
1809 | |
1461 | See C<nreqs> for an example. |
1810 | See C<nreqs> for an example. |
1462 | |
1811 | |
1463 | =item IO::AIO::poll |
1812 | =item IO::AIO::poll |
1464 | |
1813 | |
… | |
… | |
1653 | |
2002 | |
1654 | =item IO::AIO::fadvise $fh, $offset, $len, $advice |
2003 | =item IO::AIO::fadvise $fh, $offset, $len, $advice |
1655 | |
2004 | |
1656 | Simply calls the C<posix_fadvise> function (see its |
2005 | Simply calls the C<posix_fadvise> function (see its |
1657 | manpage for details). The following advice constants are |
2006 | manpage for details). The following advice constants are |
1658 | avaiable: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>, |
2007 | available: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>, |
1659 | C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>, |
2008 | C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>, |
1660 | C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>. |
2009 | C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>. |
1661 | |
2010 | |
1662 | On systems that do not implement C<posix_fadvise>, this function returns |
2011 | On systems that do not implement C<posix_fadvise>, this function returns |
1663 | ENOSYS, otherwise the return value of C<posix_fadvise>. |
2012 | ENOSYS, otherwise the return value of C<posix_fadvise>. |
1664 | |
2013 | |
1665 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
2014 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
1666 | |
2015 | |
1667 | Simply calls the C<posix_madvise> function (see its |
2016 | Simply calls the C<posix_madvise> function (see its |
1668 | manpage for details). The following advice constants are |
2017 | manpage for details). The following advice constants are |
1669 | avaiable: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
2018 | available: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
1670 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>. |
2019 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>. |
1671 | |
2020 | |
1672 | On systems that do not implement C<posix_madvise>, this function returns |
2021 | On systems that do not implement C<posix_madvise>, this function returns |
1673 | ENOSYS, otherwise the return value of C<posix_madvise>. |
2022 | ENOSYS, otherwise the return value of C<posix_madvise>. |
1674 | |
2023 | |
1675 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
2024 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
1676 | |
2025 | |
1677 | Simply calls the C<mprotect> function on the preferably AIO::mmap'ed |
2026 | Simply calls the C<mprotect> function on the preferably AIO::mmap'ed |
1678 | $scalar (see its manpage for details). The following protect |
2027 | $scalar (see its manpage for details). The following protect |
1679 | constants are avaiable: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>, |
2028 | constants are available: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>, |
1680 | C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>. |
2029 | C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>. |
1681 | |
2030 | |
1682 | On systems that do not implement C<mprotect>, this function returns |
2031 | On systems that do not implement C<mprotect>, this function returns |
1683 | ENOSYS, otherwise the return value of C<mprotect>. |
2032 | ENOSYS, otherwise the return value of C<mprotect>. |
1684 | |
2033 | |
1685 | =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
2034 | =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
1686 | |
2035 | |
1687 | Memory-maps a file (or anonymous memory range) and attaches it to the |
2036 | Memory-maps a file (or anonymous memory range) and attaches it to the |
1688 | given C<$scalar>, which will act like a string scalar. |
2037 | given C<$scalar>, which will act like a string scalar. Returns true on |
|
|
2038 | success, and false otherwise. |
1689 | |
2039 | |
1690 | The only operations allowed on the scalar are C<substr>/C<vec> that don't |
2040 | The only operations allowed on the scalar are C<substr>/C<vec> that don't |
1691 | change the string length, and most read-only operations such as copying it |
2041 | change the string length, and most read-only operations such as copying it |
1692 | or searching it with regexes and so on. |
2042 | or searching it with regexes and so on. |
1693 | |
2043 | |
… | |
… | |
1746 | Calls the C<munlockall> function. |
2096 | Calls the C<munlockall> function. |
1747 | |
2097 | |
1748 | On systems that do not implement C<munlockall>, this function returns |
2098 | On systems that do not implement C<munlockall>, this function returns |
1749 | ENOSYS, otherwise the return value of C<munlockall>. |
2099 | ENOSYS, otherwise the return value of C<munlockall>. |
1750 | |
2100 | |
|
|
2101 | =item IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
|
|
2102 | |
|
|
2103 | Calls the GNU/Linux C<splice(2)> syscall, if available. If C<$r_off> or |
|
|
2104 | C<$w_off> are C<undef>, then C<NULL> is passed for these, otherwise they |
|
|
2105 | should be the file offset. |
|
|
2106 | |
|
|
2107 | C<$r_fh> and C<$w_fh> should not refer to the same file, as splice might |
|
|
2108 | silently corrupt the data in this case. |
|
|
2109 | |
|
|
2110 | The following symbol flag values are available: C<IO::AIO::SPLICE_F_MOVE>, |
|
|
2111 | C<IO::AIO::SPLICE_F_NONBLOCK>, C<IO::AIO::SPLICE_F_MORE> and |
|
|
2112 | C<IO::AIO::SPLICE_F_GIFT>. |
|
|
2113 | |
|
|
2114 | See the C<splice(2)> manpage for details. |
|
|
2115 | |
|
|
2116 | =item IO::AIO::tee $r_fh, $w_fh, $length, $flags |
|
|
2117 | |
|
|
2118 | Calls the GNU/Linux C<tee(2)> syscall, see it's manpage and the |
|
|
2119 | description for C<IO::AIO::splice> above for details. |
|
|
2120 | |
|
|
2121 | =item $actual_size = IO::AIO::pipesize $r_fh[, $new_size] |
|
|
2122 | |
|
|
2123 | Attempts to query or change the pipe buffer size. Obviously works only |
|
|
2124 | on pipes, and currently works only on GNU/Linux systems, and fails with |
|
|
2125 | C<-1>/C<ENOSYS> everywhere else. If anybody knows how to influence pipe buffer |
|
|
2126 | size on other systems, drop me a note. |
|
|
2127 | |
1751 | =back |
2128 | =back |
1752 | |
2129 | |
1753 | =cut |
2130 | =cut |
1754 | |
2131 | |
1755 | min_parallel 8; |
2132 | min_parallel 8; |
… | |
… | |
1789 | Danga::Socket->AddOtherFds (IO::AIO::poll_fileno => |
2166 | Danga::Socket->AddOtherFds (IO::AIO::poll_fileno => |
1790 | \&IO::AIO::poll_cb); |
2167 | \&IO::AIO::poll_cb); |
1791 | |
2168 | |
1792 | =head2 FORK BEHAVIOUR |
2169 | =head2 FORK BEHAVIOUR |
1793 | |
2170 | |
1794 | This module should do "the right thing" when the process using it forks: |
2171 | Usage of pthreads in a program changes the semantics of fork |
|
|
2172 | considerably. Specifically, only async-safe functions can be called after |
|
|
2173 | fork. Perl doesn't know about this, so in general, you cannot call fork |
|
|
2174 | with defined behaviour in perl if pthreads are involved. IO::AIO uses |
|
|
2175 | pthreads, so this applies, but many other extensions and (for inexplicable |
|
|
2176 | reasons) perl itself often is linked against pthreads, so this limitation |
|
|
2177 | applies to quite a lot of perls. |
1795 | |
2178 | |
1796 | Before the fork, IO::AIO enters a quiescent state where no requests |
2179 | This module no longer tries to fight your OS, or POSIX. That means IO::AIO |
1797 | can be added in other threads and no results will be processed. After |
2180 | only works in the process that loaded it. Forking is fully supported, but |
1798 | the fork the parent simply leaves the quiescent state and continues |
2181 | using IO::AIO in the child is not. |
1799 | request/result processing, while the child frees the request/result queue |
|
|
1800 | (so that the requests started before the fork will only be handled in the |
|
|
1801 | parent). Threads will be started on demand until the limit set in the |
|
|
1802 | parent process has been reached again. |
|
|
1803 | |
2182 | |
1804 | In short: the parent will, after a short pause, continue as if fork had |
2183 | You might get around by not I<using> IO::AIO before (or after) |
1805 | not been called, while the child will act as if IO::AIO has not been used |
2184 | forking. You could also try to call the L<IO::AIO::reinit> function in the |
1806 | yet. |
2185 | child: |
|
|
2186 | |
|
|
2187 | =over 4 |
|
|
2188 | |
|
|
2189 | =item IO::AIO::reinit |
|
|
2190 | |
|
|
2191 | Abandons all current requests and I/O threads and simply reinitialises all |
|
|
2192 | data structures. This is not an operation supported by any standards, but |
|
|
2193 | happens to work on GNU/Linux and some newer BSD systems. |
|
|
2194 | |
|
|
2195 | The only reasonable use for this function is to call it after forking, if |
|
|
2196 | C<IO::AIO> was used in the parent. Calling it while IO::AIO is active in |
|
|
2197 | the process will result in undefined behaviour. Calling it at any time |
|
|
2198 | will also result in any undefined (by POSIX) behaviour. |
|
|
2199 | |
|
|
2200 | =back |
1807 | |
2201 | |
1808 | =head2 MEMORY USAGE |
2202 | =head2 MEMORY USAGE |
1809 | |
2203 | |
1810 | Per-request usage: |
2204 | Per-request usage: |
1811 | |
2205 | |