… | |
… | |
168 | use common::sense; |
168 | use common::sense; |
169 | |
169 | |
170 | use base 'Exporter'; |
170 | use base 'Exporter'; |
171 | |
171 | |
172 | BEGIN { |
172 | BEGIN { |
173 | our $VERSION = '3.9'; |
173 | our $VERSION = '4.15'; |
174 | |
174 | |
175 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close |
175 | our @AIO_REQ = qw(aio_sendfile aio_seek aio_read aio_write aio_open aio_close |
176 | aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx |
176 | aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx |
177 | aio_scandir aio_symlink aio_readlink aio_sync aio_fsync |
177 | aio_scandir aio_symlink aio_readlink aio_realpath aio_sync |
178 | aio_fdatasync aio_sync_file_range aio_pathsync aio_readahead |
178 | aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range aio_fallocate |
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179 | aio_pathsync aio_readahead aio_fiemap |
179 | aio_rename aio_link aio_move aio_copy aio_group |
180 | aio_rename aio_link aio_move aio_copy aio_group |
180 | aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown |
181 | aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown |
181 | aio_chmod aio_utime aio_truncate |
182 | aio_chmod aio_utime aio_truncate |
182 | aio_msync aio_mtouch aio_mlock aio_mlockall |
183 | aio_msync aio_mtouch aio_mlock aio_mlockall |
183 | aio_statvfs); |
184 | aio_statvfs |
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185 | aio_wd); |
184 | |
186 | |
185 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
187 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
186 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
188 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
187 | min_parallel max_parallel max_idle idle_timeout |
189 | min_parallel max_parallel max_idle idle_timeout |
188 | nreqs nready npending nthreads |
190 | nreqs nready npending nthreads |
… | |
… | |
204 | |
206 | |
205 | This section simply lists the prototypes of the most important functions |
207 | This section simply lists the prototypes of the most important functions |
206 | for quick reference. See the following sections for function-by-function |
208 | for quick reference. See the following sections for function-by-function |
207 | documentation. |
209 | documentation. |
208 | |
210 | |
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211 | aio_wd $pathname, $callback->($wd) |
209 | aio_open $pathname, $flags, $mode, $callback->($fh) |
212 | aio_open $pathname, $flags, $mode, $callback->($fh) |
210 | aio_close $fh, $callback->($status) |
213 | aio_close $fh, $callback->($status) |
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214 | aio_seek $fh,$offset,$whence, $callback->($offs) |
211 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
215 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
212 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
216 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
213 | aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
217 | aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
214 | aio_readahead $fh,$offset,$length, $callback->($retval) |
218 | aio_readahead $fh,$offset,$length, $callback->($retval) |
215 | aio_stat $fh_or_path, $callback->($status) |
219 | aio_stat $fh_or_path, $callback->($status) |
216 | aio_lstat $fh, $callback->($status) |
220 | aio_lstat $fh, $callback->($status) |
217 | aio_statvfs $fh_or_path, $callback->($statvfs) |
221 | aio_statvfs $fh_or_path, $callback->($statvfs) |
218 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
222 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
219 | aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
223 | aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
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224 | aio_chmod $fh_or_path, $mode, $callback->($status) |
220 | aio_truncate $fh_or_path, $offset, $callback->($status) |
225 | aio_truncate $fh_or_path, $offset, $callback->($status) |
221 | aio_chmod $fh_or_path, $mode, $callback->($status) |
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222 | aio_unlink $pathname, $callback->($status) |
226 | aio_unlink $pathname, $callback->($status) |
223 | aio_mknod $path, $mode, $dev, $callback->($status) |
227 | aio_mknod $pathname, $mode, $dev, $callback->($status) |
224 | aio_link $srcpath, $dstpath, $callback->($status) |
228 | aio_link $srcpath, $dstpath, $callback->($status) |
225 | aio_symlink $srcpath, $dstpath, $callback->($status) |
229 | aio_symlink $srcpath, $dstpath, $callback->($status) |
226 | aio_readlink $path, $callback->($link) |
230 | aio_readlink $pathname, $callback->($link) |
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231 | aio_realpath $pathname, $callback->($link) |
227 | aio_rename $srcpath, $dstpath, $callback->($status) |
232 | aio_rename $srcpath, $dstpath, $callback->($status) |
228 | aio_mkdir $pathname, $mode, $callback->($status) |
233 | aio_mkdir $pathname, $mode, $callback->($status) |
229 | aio_rmdir $pathname, $callback->($status) |
234 | aio_rmdir $pathname, $callback->($status) |
230 | aio_readdir $pathname, $callback->($entries) |
235 | aio_readdir $pathname, $callback->($entries) |
231 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
236 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
232 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
237 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
233 | IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN |
238 | IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN |
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239 | aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs) |
234 | aio_load $path, $data, $callback->($status) |
240 | aio_load $pathname, $data, $callback->($status) |
235 | aio_copy $srcpath, $dstpath, $callback->($status) |
241 | aio_copy $srcpath, $dstpath, $callback->($status) |
236 | aio_move $srcpath, $dstpath, $callback->($status) |
242 | aio_move $srcpath, $dstpath, $callback->($status) |
237 | aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
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238 | aio_rmtree $path, $callback->($status) |
243 | aio_rmtree $pathname, $callback->($status) |
239 | aio_sync $callback->($status) |
244 | aio_sync $callback->($status) |
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245 | aio_syncfs $fh, $callback->($status) |
240 | aio_fsync $fh, $callback->($status) |
246 | aio_fsync $fh, $callback->($status) |
241 | aio_fdatasync $fh, $callback->($status) |
247 | aio_fdatasync $fh, $callback->($status) |
242 | aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
248 | aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
243 | aio_pathsync $path, $callback->($status) |
249 | aio_pathsync $pathname, $callback->($status) |
244 | aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
250 | aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
245 | aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
251 | aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
246 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
252 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
247 | aio_mlockall $flags, $callback->($status) |
253 | aio_mlockall $flags, $callback->($status) |
248 | aio_group $callback->(...) |
254 | aio_group $callback->(...) |
… | |
… | |
266 | IO::AIO::nready |
272 | IO::AIO::nready |
267 | IO::AIO::npending |
273 | IO::AIO::npending |
268 | |
274 | |
269 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
275 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
270 | IO::AIO::fadvise $fh, $offset, $len, $advice |
276 | IO::AIO::fadvise $fh, $offset, $len, $advice |
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277 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
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278 | IO::AIO::munmap $scalar |
271 | IO::AIO::madvise $scalar, $offset, $length, $advice |
279 | IO::AIO::madvise $scalar, $offset, $length, $advice |
272 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
280 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
273 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
281 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
274 | IO::AIO::munlockall |
282 | IO::AIO::munlockall |
275 | |
283 | |
276 | =head2 AIO REQUEST FUNCTIONS |
284 | =head2 API NOTES |
277 | |
285 | |
278 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
286 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
279 | with the same name (sans C<aio_>). The arguments are similar or identical, |
287 | with the same name (sans C<aio_>). The arguments are similar or identical, |
280 | and they all accept an additional (and optional) C<$callback> argument |
288 | and they all accept an additional (and optional) C<$callback> argument |
281 | which must be a code reference. This code reference will get called with |
289 | which must be a code reference. This code reference will be called after |
282 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
290 | the syscall has been executed in an asynchronous fashion. The results |
283 | perl, which usually delivers "false") as its sole argument after the given |
291 | of the request will be passed as arguments to the callback (and, if an |
284 | syscall has been executed asynchronously. |
292 | error occured, in C<$!>) - for most requests the syscall return code (e.g. |
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293 | most syscalls return C<-1> on error, unlike perl, which usually delivers |
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294 | "false"). |
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295 | |
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296 | Some requests (such as C<aio_readdir>) pass the actual results and |
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297 | communicate failures by passing C<undef>. |
285 | |
298 | |
286 | All functions expecting a filehandle keep a copy of the filehandle |
299 | All functions expecting a filehandle keep a copy of the filehandle |
287 | internally until the request has finished. |
300 | internally until the request has finished. |
288 | |
301 | |
289 | All functions return request objects of type L<IO::AIO::REQ> that allow |
302 | All functions return request objects of type L<IO::AIO::REQ> that allow |
290 | further manipulation of those requests while they are in-flight. |
303 | further manipulation of those requests while they are in-flight. |
291 | |
304 | |
292 | The pathnames you pass to these routines I<must> be absolute and |
305 | 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 |
306 | 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 |
307 | current working directory could have changed. Alternatively, you can |
295 | changed. Alternatively, you can make sure that you never change the |
308 | make sure that you never change the current working directory anywhere |
296 | current working directory anywhere in the program and then use relative |
309 | in the program and then use relative paths. You can also take advantage |
297 | paths. |
310 | of IO::AIOs working directory abstraction, that lets you specify paths |
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311 | relative to some previously-opened "working directory object" - see the |
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312 | description of the C<IO::AIO::WD> class later in this document. |
298 | |
313 | |
299 | To encode pathnames as octets, either make sure you either: a) always pass |
314 | 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 |
315 | 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 |
316 | 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 |
317 | 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) |
318 | effect in the user environment, d) use Glib::filename_from_unicode on |
304 | use something else to ensure your scalar has the correct contents. |
319 | unicode filenames or e) use something else to ensure your scalar has the |
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320 | correct contents. |
305 | |
321 | |
306 | This works, btw. independent of the internal UTF-8 bit, which IO::AIO |
322 | This works, btw. independent of the internal UTF-8 bit, which IO::AIO |
307 | handles correctly whether it is set or not. |
323 | handles correctly whether it is set or not. |
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324 | |
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325 | =head2 AIO REQUEST FUNCTIONS |
308 | |
326 | |
309 | =over 4 |
327 | =over 4 |
310 | |
328 | |
311 | =item $prev_pri = aioreq_pri [$pri] |
329 | =item $prev_pri = aioreq_pri [$pri] |
312 | |
330 | |
… | |
… | |
394 | |
412 | |
395 | Or in other words: the file descriptor will be closed, but it will not be |
413 | 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. |
414 | free for reuse until the perl filehandle is closed. |
397 | |
415 | |
398 | =cut |
416 | =cut |
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|
417 | |
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418 | =item aio_seek $fh, $offset, $whence, $callback->($offs) |
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419 | |
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|
420 | Seeks the filehandle to the new C<$offset>, similarly to perl's |
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421 | C<sysseek>. The C<$whence> can use the traditional values (C<0> for |
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422 | C<IO::AIO::SEEK_SET>, C<1> for C<IO::AIO::SEEK_CUR> or C<2> for |
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423 | C<IO::AIO::SEEK_END>). |
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|
424 | |
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425 | The resulting absolute offset will be passed to the callback, or C<-1> in |
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426 | case of an error. |
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427 | |
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428 | In theory, the C<$whence> constants could be different than the |
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429 | corresponding values from L<Fcntl>, but perl guarantees they are the same, |
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430 | so don't panic. |
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|
431 | |
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432 | As a GNU/Linux (and maybe Solaris) extension, also the constants |
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433 | C<IO::AIO::SEEK_DATA> and C<IO::AIO::SEEK_HOLE> are available, if they |
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434 | could be found. No guarantees about suitability for use in C<aio_seek> or |
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435 | Perl's C<sysseek> can be made though, although I would naively assume they |
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|
436 | "just work". |
399 | |
437 | |
400 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
438 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
401 | |
439 | |
402 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
440 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
403 | |
441 | |
… | |
… | |
611 | |
649 | |
612 | Asynchronously unlink (delete) a file and call the callback with the |
650 | Asynchronously unlink (delete) a file and call the callback with the |
613 | result code. |
651 | result code. |
614 | |
652 | |
615 | |
653 | |
616 | =item aio_mknod $path, $mode, $dev, $callback->($status) |
654 | =item aio_mknod $pathname, $mode, $dev, $callback->($status) |
617 | |
655 | |
618 | [EXPERIMENTAL] |
656 | [EXPERIMENTAL] |
619 | |
657 | |
620 | Asynchronously create a device node (or fifo). See mknod(2). |
658 | Asynchronously create a device node (or fifo). See mknod(2). |
621 | |
659 | |
622 | The only (POSIX-) portable way of calling this function is: |
660 | The only (POSIX-) portable way of calling this function is: |
623 | |
661 | |
624 | aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
662 | aio_mknod $pathname, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
625 | |
663 | |
626 | See C<aio_stat> for info about some potentially helpful extra constants |
664 | See C<aio_stat> for info about some potentially helpful extra constants |
627 | and functions. |
665 | and functions. |
628 | |
666 | |
629 | =item aio_link $srcpath, $dstpath, $callback->($status) |
667 | =item aio_link $srcpath, $dstpath, $callback->($status) |
… | |
… | |
636 | |
674 | |
637 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
675 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
638 | the path C<$dstpath> and call the callback with the result code. |
676 | the path C<$dstpath> and call the callback with the result code. |
639 | |
677 | |
640 | |
678 | |
641 | =item aio_readlink $path, $callback->($link) |
679 | =item aio_readlink $pathname, $callback->($link) |
642 | |
680 | |
643 | Asynchronously read the symlink specified by C<$path> and pass it to |
681 | Asynchronously read the symlink specified by C<$path> and pass it to |
644 | the callback. If an error occurs, nothing or undef gets passed to the |
682 | the callback. If an error occurs, nothing or undef gets passed to the |
645 | callback. |
683 | callback. |
646 | |
684 | |
647 | |
685 | |
|
|
686 | =item aio_realpath $pathname, $callback->($path) |
|
|
687 | |
|
|
688 | Asynchronously make the path absolute and resolve any symlinks in |
|
|
689 | C<$path>. The resulting path only consists of directories (Same as |
|
|
690 | L<Cwd::realpath>). |
|
|
691 | |
|
|
692 | This request can be used to get the absolute path of the current working |
|
|
693 | directory by passing it a path of F<.> (a single dot). |
|
|
694 | |
|
|
695 | |
648 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
696 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
649 | |
697 | |
650 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
698 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
651 | rename(2) and call the callback with the result code. |
699 | rename(2) and call the callback with the result code. |
652 | |
700 | |
… | |
… | |
674 | array-ref with the filenames. |
722 | array-ref with the filenames. |
675 | |
723 | |
676 | |
724 | |
677 | =item aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
725 | =item aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
678 | |
726 | |
679 | Quite similar to C<aio_readdir>, but the C<$flags> argument allows to tune |
727 | 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 |
728 | tune behaviour and output format. In case of an error, C<$entries> will be |
681 | C<undef>. |
729 | C<undef>. |
682 | |
730 | |
683 | The flags are a combination of the following constants, ORed together (the |
731 | The flags are a combination of the following constants, ORed together (the |
684 | flags will also be passed to the callback, possibly modified): |
732 | flags will also be passed to the callback, possibly modified): |
685 | |
733 | |
… | |
… | |
732 | |
780 | |
733 | =item IO::AIO::READDIR_FOUND_UNKNOWN |
781 | =item IO::AIO::READDIR_FOUND_UNKNOWN |
734 | |
782 | |
735 | This flag should not be set when calling C<aio_readdirx>. Instead, it |
783 | This flag should not be set when calling C<aio_readdirx>. Instead, it |
736 | is being set by C<aio_readdirx>, when any of the C<$type>'s found were |
784 | is being set by C<aio_readdirx>, when any of the C<$type>'s found were |
737 | C<IO::AIO::DT_UNKNOWN>. The absense of this flag therefore indicates that all |
785 | C<IO::AIO::DT_UNKNOWN>. The absence of this flag therefore indicates that all |
738 | C<$type>'s are known, which can be used to speed up some algorithms. |
786 | C<$type>'s are known, which can be used to speed up some algorithms. |
739 | |
787 | |
740 | =back |
788 | =back |
741 | |
789 | |
742 | |
790 | |
743 | =item aio_load $path, $data, $callback->($status) |
791 | =item aio_load $pathname, $data, $callback->($status) |
744 | |
792 | |
745 | This is a composite request that tries to fully load the given file into |
793 | This is a composite request that tries to fully load the given file into |
746 | memory. Status is the same as with aio_read. |
794 | memory. Status is the same as with aio_read. |
747 | |
795 | |
748 | =cut |
796 | =cut |
… | |
… | |
883 | }; |
931 | }; |
884 | |
932 | |
885 | $grp |
933 | $grp |
886 | } |
934 | } |
887 | |
935 | |
888 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
936 | =item aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs) |
889 | |
937 | |
890 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
938 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
891 | efficiently separate the entries of directory C<$path> into two sets of |
939 | efficiently separate the entries of directory C<$path> into two sets of |
892 | names, directories you can recurse into (directories), and ones you cannot |
940 | names, directories you can recurse into (directories), and ones you cannot |
893 | recurse into (everything else, including symlinks to directories). |
941 | recurse into (everything else, including symlinks to directories). |
… | |
… | |
924 | Then entries will be sorted into likely directories a non-initial dot |
972 | Then entries will be sorted into likely directories a non-initial dot |
925 | currently) and likely non-directories (see C<aio_readdirx>). Then every |
973 | 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, |
974 | 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 |
975 | 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 |
976 | 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 |
977 | 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 |
978 | 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 |
979 | data (e.g. ext2fs filetype feature), even on systems that cannot return |
932 | the filetype information on readdir. |
980 | the filetype information on readdir. |
933 | |
981 | |
934 | If the known number of directories (link count - 2) has been reached, the |
982 | If the known number of directories (link count - 2) has been reached, the |
… | |
… | |
950 | |
998 | |
951 | my $grp = aio_group $cb; |
999 | my $grp = aio_group $cb; |
952 | |
1000 | |
953 | $maxreq = 4 if $maxreq <= 0; |
1001 | $maxreq = 4 if $maxreq <= 0; |
954 | |
1002 | |
955 | # stat once |
1003 | # get a wd object |
956 | aioreq_pri $pri; |
1004 | aioreq_pri $pri; |
957 | add $grp aio_stat $path, sub { |
1005 | add $grp aio_wd $path, sub { |
|
|
1006 | $_[0] |
958 | return $grp->result () if $_[0]; |
1007 | or return $grp->result (); |
959 | my $now = time; |
|
|
960 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
961 | |
1008 | |
962 | # read the directory entries |
1009 | my $wd = [shift, "."]; |
|
|
1010 | |
|
|
1011 | # stat once |
963 | aioreq_pri $pri; |
1012 | aioreq_pri $pri; |
964 | add $grp aio_readdirx $path, READDIR_DIRS_FIRST, sub { |
1013 | add $grp aio_stat $wd, sub { |
965 | my $entries = shift |
|
|
966 | or return $grp->result (); |
1014 | return $grp->result () if $_[0]; |
|
|
1015 | my $now = time; |
|
|
1016 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
967 | |
1017 | |
968 | # stat the dir another time |
1018 | # read the directory entries |
969 | aioreq_pri $pri; |
1019 | aioreq_pri $pri; |
|
|
1020 | add $grp aio_readdirx $wd, READDIR_DIRS_FIRST, sub { |
|
|
1021 | my $entries = shift |
|
|
1022 | or return $grp->result (); |
|
|
1023 | |
|
|
1024 | # stat the dir another time |
|
|
1025 | aioreq_pri $pri; |
970 | add $grp aio_stat $path, sub { |
1026 | add $grp aio_stat $wd, sub { |
971 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
1027 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
972 | |
1028 | |
973 | my $ndirs; |
1029 | my $ndirs; |
974 | |
1030 | |
975 | # take the slow route if anything looks fishy |
1031 | # take the slow route if anything looks fishy |
976 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
1032 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
977 | $ndirs = -1; |
1033 | $ndirs = -1; |
978 | } else { |
1034 | } else { |
979 | # if nlink == 2, we are finished |
1035 | # if nlink == 2, we are finished |
980 | # for non-posix-fs's, we rely on nlink < 2 |
1036 | # for non-posix-fs's, we rely on nlink < 2 |
981 | $ndirs = (stat _)[3] - 2 |
1037 | $ndirs = (stat _)[3] - 2 |
982 | or return $grp->result ([], $entries); |
1038 | or return $grp->result ([], $entries); |
983 | } |
1039 | } |
984 | |
1040 | |
985 | my (@dirs, @nondirs); |
1041 | my (@dirs, @nondirs); |
986 | |
1042 | |
987 | my $statgrp = add $grp aio_group sub { |
1043 | my $statgrp = add $grp aio_group sub { |
988 | $grp->result (\@dirs, \@nondirs); |
1044 | $grp->result (\@dirs, \@nondirs); |
989 | }; |
1045 | }; |
990 | |
1046 | |
991 | limit $statgrp $maxreq; |
1047 | limit $statgrp $maxreq; |
992 | feed $statgrp sub { |
1048 | feed $statgrp sub { |
993 | return unless @$entries; |
1049 | return unless @$entries; |
994 | my $entry = shift @$entries; |
1050 | my $entry = shift @$entries; |
995 | |
1051 | |
996 | aioreq_pri $pri; |
1052 | aioreq_pri $pri; |
|
|
1053 | $wd->[1] = "$entry/."; |
997 | add $statgrp aio_stat "$path/$entry/.", sub { |
1054 | add $statgrp aio_stat $wd, sub { |
998 | if ($_[0] < 0) { |
1055 | if ($_[0] < 0) { |
999 | push @nondirs, $entry; |
1056 | push @nondirs, $entry; |
1000 | } else { |
1057 | } else { |
1001 | # need to check for real directory |
1058 | # need to check for real directory |
1002 | aioreq_pri $pri; |
1059 | aioreq_pri $pri; |
|
|
1060 | $wd->[1] = $entry; |
1003 | add $statgrp aio_lstat "$path/$entry", sub { |
1061 | add $statgrp aio_lstat $wd, sub { |
1004 | if (-d _) { |
1062 | if (-d _) { |
1005 | push @dirs, $entry; |
1063 | push @dirs, $entry; |
1006 | |
1064 | |
1007 | unless (--$ndirs) { |
1065 | unless (--$ndirs) { |
1008 | push @nondirs, @$entries; |
1066 | push @nondirs, @$entries; |
1009 | feed $statgrp; |
1067 | feed $statgrp; |
|
|
1068 | } |
|
|
1069 | } else { |
|
|
1070 | push @nondirs, $entry; |
1010 | } |
1071 | } |
1011 | } else { |
|
|
1012 | push @nondirs, $entry; |
|
|
1013 | } |
1072 | } |
1014 | } |
1073 | } |
1015 | } |
1074 | }; |
1016 | }; |
1075 | }; |
1017 | }; |
1076 | }; |
1018 | }; |
1077 | }; |
1019 | }; |
1078 | }; |
1020 | }; |
1079 | }; |
1021 | |
1080 | |
1022 | $grp |
1081 | $grp |
1023 | } |
1082 | } |
1024 | |
1083 | |
1025 | =item aio_rmtree $path, $callback->($status) |
1084 | =item aio_rmtree $pathname, $callback->($status) |
1026 | |
1085 | |
1027 | Delete a directory tree starting (and including) C<$path>, return the |
1086 | Delete a directory tree starting (and including) C<$path>, return the |
1028 | status of the final C<rmdir> only. This is a composite request that |
1087 | 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 |
1088 | uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
1030 | everything else. |
1089 | everything else. |
… | |
… | |
1072 | callback with the fdatasync result code. |
1131 | callback with the fdatasync result code. |
1073 | |
1132 | |
1074 | If this call isn't available because your OS lacks it or it couldn't be |
1133 | 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. |
1134 | detected, it will be emulated by calling C<fsync> instead. |
1076 | |
1135 | |
|
|
1136 | =item aio_syncfs $fh, $callback->($status) |
|
|
1137 | |
|
|
1138 | Asynchronously call the syncfs syscall to sync the filesystem associated |
|
|
1139 | to the given filehandle and call the callback with the syncfs result |
|
|
1140 | code. If syncfs is not available, calls sync(), but returns C<-1> and sets |
|
|
1141 | errno to C<ENOSYS> nevertheless. |
|
|
1142 | |
1077 | =item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
1143 | =item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
1078 | |
1144 | |
1079 | Sync the data portion of the file specified by C<$offset> and C<$length> |
1145 | 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 |
1146 | 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 |
1147 | sync_file_range call. If sync_file_range is not available or it returns |
… | |
… | |
1084 | C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>, |
1150 | C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>, |
1085 | C<IO::AIO::SYNC_FILE_RANGE_WRITE> and |
1151 | C<IO::AIO::SYNC_FILE_RANGE_WRITE> and |
1086 | C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range |
1152 | C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range |
1087 | manpage for details. |
1153 | manpage for details. |
1088 | |
1154 | |
1089 | =item aio_pathsync $path, $callback->($status) |
1155 | =item aio_pathsync $pathname, $callback->($status) |
1090 | |
1156 | |
1091 | This request tries to open, fsync and close the given path. This is a |
1157 | This request tries to open, fsync and close the given path. This is a |
1092 | composite request intended to sync directories after directory operations |
1158 | composite request intended to sync directories after directory operations |
1093 | (E.g. rename). This might not work on all operating systems or have any |
1159 | (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 |
1160 | specific effect, but usually it makes sure that directory changes get |
… | |
… | |
1191 | |
1257 | |
1192 | Example: asynchronously lock all current and future pages into memory. |
1258 | Example: asynchronously lock all current and future pages into memory. |
1193 | |
1259 | |
1194 | aio_mlockall IO::AIO::MCL_FUTURE; |
1260 | aio_mlockall IO::AIO::MCL_FUTURE; |
1195 | |
1261 | |
|
|
1262 | =item aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
|
|
1263 | |
|
|
1264 | Queries the extents of the given file (by calling the Linux FIEMAP ioctl, |
|
|
1265 | see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If the |
|
|
1266 | C<ioctl> is not available on your OS, then this rquiest will fail with |
|
|
1267 | C<ENOSYS>. |
|
|
1268 | |
|
|
1269 | C<$start> is the starting offset to query extents for, C<$length> is the |
|
|
1270 | size of the range to query - if it is C<undef>, then the whole file will |
|
|
1271 | be queried. |
|
|
1272 | |
|
|
1273 | C<$flags> is a combination of flags (C<IO::AIO::FIEMAP_FLAG_SYNC> or |
|
|
1274 | C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also |
|
|
1275 | exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query |
|
|
1276 | the data portion. |
|
|
1277 | |
|
|
1278 | C<$count> is the maximum number of extent records to return. If it is |
|
|
1279 | C<undef>, then IO::AIO queries all extents of the file. As a very special |
|
|
1280 | case, if it is C<0>, then the callback receives the number of extents |
|
|
1281 | instead of the extents themselves. |
|
|
1282 | |
|
|
1283 | If an error occurs, the callback receives no arguments. The special |
|
|
1284 | C<errno> value C<IO::AIO::EBADR> is available to test for flag errors. |
|
|
1285 | |
|
|
1286 | Otherwise, the callback receives an array reference with extent |
|
|
1287 | structures. Each extent structure is an array reference itself, with the |
|
|
1288 | following members: |
|
|
1289 | |
|
|
1290 | [$logical, $physical, $length, $flags] |
|
|
1291 | |
|
|
1292 | Flags is any combination of the following flag values (typically either C<0> |
|
|
1293 | or C<IO::AIO::FIEMAP_EXTENT_LAST>): |
|
|
1294 | |
|
|
1295 | C<IO::AIO::FIEMAP_EXTENT_LAST>, C<IO::AIO::FIEMAP_EXTENT_UNKNOWN>, |
|
|
1296 | C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>, |
|
|
1297 | C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>, |
|
|
1298 | C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>, |
|
|
1299 | C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or |
|
|
1300 | C<IO::AIO::FIEMAP_EXTENT_SHARED>. |
|
|
1301 | |
1196 | =item aio_group $callback->(...) |
1302 | =item aio_group $callback->(...) |
1197 | |
1303 | |
1198 | This is a very special aio request: Instead of doing something, it is a |
1304 | 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 |
1305 | container for other aio requests, which is useful if you want to bundle |
1200 | many requests into a single, composite, request with a definite callback |
1306 | many requests into a single, composite, request with a definite callback |
… | |
… | |
1236 | like sleep and file handle readable/writable, the overhead this creates is |
1342 | 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 |
1343 | 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. |
1344 | except to put your application under artificial I/O pressure. |
1239 | |
1345 | |
1240 | =back |
1346 | =back |
|
|
1347 | |
|
|
1348 | |
|
|
1349 | =head2 IO::AIO::WD - multiple working directories |
|
|
1350 | |
|
|
1351 | Your process only has one current working directory, which is used by all |
|
|
1352 | threads. This makes it hard to use relative paths (some other component |
|
|
1353 | could call C<chdir> at any time, and it is hard to control when the path |
|
|
1354 | will be used by IO::AIO). |
|
|
1355 | |
|
|
1356 | One solution for this is to always use absolute paths. This usually works, |
|
|
1357 | but can be quite slow (the kernel has to walk the whole path on every |
|
|
1358 | access), and can also be a hassle to implement. |
|
|
1359 | |
|
|
1360 | Newer POSIX systems have a number of functions (openat, fdopendir, |
|
|
1361 | futimensat and so on) that make it possible to specify working directories |
|
|
1362 | per operation. |
|
|
1363 | |
|
|
1364 | For portability, and because the clowns who "designed", or shall I write, |
|
|
1365 | perpetrated this new interface were obviously half-drunk, this abstraction |
|
|
1366 | cannot be perfect, though. |
|
|
1367 | |
|
|
1368 | IO::AIO allows you to convert directory paths into a so-called IO::AIO::WD |
|
|
1369 | object. This object stores the canonicalised, absolute version of the |
|
|
1370 | path, and on systems that allow it, also a directory file descriptor. |
|
|
1371 | |
|
|
1372 | Everywhere where a pathname is accepted by IO::AIO (e.g. in C<aio_stat> |
|
|
1373 | or C<aio_unlink>), one can specify an array reference with an IO::AIO::WD |
|
|
1374 | object and a pathname instead (or the IO::AIO::WD object alone, which |
|
|
1375 | gets interpreted as C<[$wd, "."]>). If the pathname is absolute, the |
|
|
1376 | IO::AIO::WD object is ignored, otherwise the pathname is resolved relative |
|
|
1377 | to that IO::AIO::WD object. |
|
|
1378 | |
|
|
1379 | For example, to get a wd object for F</etc> and then stat F<passwd> |
|
|
1380 | inside, you would write: |
|
|
1381 | |
|
|
1382 | aio_wd "/etc", sub { |
|
|
1383 | my $etcdir = shift; |
|
|
1384 | |
|
|
1385 | # although $etcdir can be undef on error, there is generally no reason |
|
|
1386 | # to check for errors here, as aio_stat will fail with ENOENT |
|
|
1387 | # when $etcdir is undef. |
|
|
1388 | |
|
|
1389 | aio_stat [$etcdir, "passwd"], sub { |
|
|
1390 | # yay |
|
|
1391 | }; |
|
|
1392 | }; |
|
|
1393 | |
|
|
1394 | That C<aio_wd> is a request and not a normal function shows that creating |
|
|
1395 | an IO::AIO::WD object is itself a potentially blocking operation, which is |
|
|
1396 | why it is done asynchronously. |
|
|
1397 | |
|
|
1398 | To stat the directory obtained with C<aio_wd> above, one could write |
|
|
1399 | either of the following three request calls: |
|
|
1400 | |
|
|
1401 | aio_lstat "/etc" , sub { ... # pathname as normal string |
|
|
1402 | aio_lstat [$wd, "."], sub { ... # "." relative to $wd (i.e. $wd itself) |
|
|
1403 | aio_lstat $wd , sub { ... # shorthand for the previous |
|
|
1404 | |
|
|
1405 | As with normal pathnames, IO::AIO keeps a copy of the working directory |
|
|
1406 | object and the pathname string, so you could write the following without |
|
|
1407 | causing any issues due to C<$path> getting reused: |
|
|
1408 | |
|
|
1409 | my $path = [$wd, undef]; |
|
|
1410 | |
|
|
1411 | for my $name (qw(abc def ghi)) { |
|
|
1412 | $path->[1] = $name; |
|
|
1413 | aio_stat $path, sub { |
|
|
1414 | # ... |
|
|
1415 | }; |
|
|
1416 | } |
|
|
1417 | |
|
|
1418 | There are some caveats: when directories get renamed (or deleted), the |
|
|
1419 | pathname string doesn't change, so will point to the new directory (or |
|
|
1420 | nowhere at all), while the directory fd, if available on the system, |
|
|
1421 | will still point to the original directory. Most functions accepting a |
|
|
1422 | pathname will use the directory fd on newer systems, and the string on |
|
|
1423 | older systems. Some functions (such as realpath) will always rely on the |
|
|
1424 | string form of the pathname. |
|
|
1425 | |
|
|
1426 | So this fucntionality is mainly useful to get some protection against |
|
|
1427 | C<chdir>, to easily get an absolute path out of a relative path for future |
|
|
1428 | reference, and to speed up doing many operations in the same directory |
|
|
1429 | (e.g. when stat'ing all files in a directory). |
|
|
1430 | |
|
|
1431 | The following functions implement this working directory abstraction: |
|
|
1432 | |
|
|
1433 | =over 4 |
|
|
1434 | |
|
|
1435 | =item aio_wd $pathname, $callback->($wd) |
|
|
1436 | |
|
|
1437 | Asynchonously canonicalise the given pathname and convert it to an |
|
|
1438 | IO::AIO::WD object representing it. If possible and supported on the |
|
|
1439 | system, also open a directory fd to speed up pathname resolution relative |
|
|
1440 | to this working directory. |
|
|
1441 | |
|
|
1442 | If something goes wrong, then C<undef> is passwd to the callback instead |
|
|
1443 | of a working directory object and C<$!> is set appropriately. Since |
|
|
1444 | passing C<undef> as working directory component of a pathname fails the |
|
|
1445 | request with C<ENOENT>, there is often no need for error checking in the |
|
|
1446 | C<aio_wd> callback, as future requests using the value will fail in the |
|
|
1447 | expected way. |
|
|
1448 | |
|
|
1449 | If this call isn't available because your OS lacks it or it couldn't be |
|
|
1450 | detected, it will be emulated by calling C<fsync> instead. |
|
|
1451 | |
|
|
1452 | =item IO::AIO::CWD |
|
|
1453 | |
|
|
1454 | This is a compiletime constant (object) that represents the process |
|
|
1455 | current working directory. |
|
|
1456 | |
|
|
1457 | Specifying this object as working directory object for a pathname is as |
|
|
1458 | if the pathname would be specified directly, without a directory object, |
|
|
1459 | e.g., these calls are functionally identical: |
|
|
1460 | |
|
|
1461 | aio_stat "somefile", sub { ... }; |
|
|
1462 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
|
|
1463 | |
|
|
1464 | =back |
|
|
1465 | |
1241 | |
1466 | |
1242 | =head2 IO::AIO::REQ CLASS |
1467 | =head2 IO::AIO::REQ CLASS |
1243 | |
1468 | |
1244 | All non-aggregate C<aio_*> functions return an object of this class when |
1469 | All non-aggregate C<aio_*> functions return an object of this class when |
1245 | called in non-void context. |
1470 | called in non-void context. |
… | |
… | |
1363 | |
1588 | |
1364 | Sets a feeder/generator on this group: every group can have an attached |
1589 | 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, |
1590 | 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, |
1591 | 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, |
1592 | 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, |
1593 | C<aio_scandir> might generate hundreds of thousands of C<aio_stat> |
1369 | delaying any later requests for a long time. |
1594 | requests, delaying any later requests for a long time. |
1370 | |
1595 | |
1371 | To avoid this, and allow incremental generation of requests, you can |
1596 | 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 |
1597 | 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>, |
1598 | 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 |
1599 | below) requests active in the group itself and is expected to queue more |
… | |
… | |
1653 | |
1878 | |
1654 | =item IO::AIO::fadvise $fh, $offset, $len, $advice |
1879 | =item IO::AIO::fadvise $fh, $offset, $len, $advice |
1655 | |
1880 | |
1656 | Simply calls the C<posix_fadvise> function (see its |
1881 | Simply calls the C<posix_fadvise> function (see its |
1657 | manpage for details). The following advice constants are |
1882 | manpage for details). The following advice constants are |
1658 | avaiable: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>, |
1883 | available: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>, |
1659 | C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>, |
1884 | C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>, |
1660 | C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>. |
1885 | C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>. |
1661 | |
1886 | |
1662 | On systems that do not implement C<posix_fadvise>, this function returns |
1887 | On systems that do not implement C<posix_fadvise>, this function returns |
1663 | ENOSYS, otherwise the return value of C<posix_fadvise>. |
1888 | ENOSYS, otherwise the return value of C<posix_fadvise>. |
1664 | |
1889 | |
1665 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
1890 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
1666 | |
1891 | |
1667 | Simply calls the C<posix_madvise> function (see its |
1892 | Simply calls the C<posix_madvise> function (see its |
1668 | manpage for details). The following advice constants are |
1893 | manpage for details). The following advice constants are |
1669 | avaiable: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
1894 | 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>. |
1895 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>. |
1671 | |
1896 | |
1672 | On systems that do not implement C<posix_madvise>, this function returns |
1897 | On systems that do not implement C<posix_madvise>, this function returns |
1673 | ENOSYS, otherwise the return value of C<posix_madvise>. |
1898 | ENOSYS, otherwise the return value of C<posix_madvise>. |
1674 | |
1899 | |
1675 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
1900 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
1676 | |
1901 | |
1677 | Simply calls the C<mprotect> function on the preferably AIO::mmap'ed |
1902 | Simply calls the C<mprotect> function on the preferably AIO::mmap'ed |
1678 | $scalar (see its manpage for details). The following protect |
1903 | $scalar (see its manpage for details). The following protect |
1679 | constants are avaiable: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>, |
1904 | constants are available: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>, |
1680 | C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>. |
1905 | C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>. |
1681 | |
1906 | |
1682 | On systems that do not implement C<mprotect>, this function returns |
1907 | On systems that do not implement C<mprotect>, this function returns |
1683 | ENOSYS, otherwise the return value of C<mprotect>. |
1908 | ENOSYS, otherwise the return value of C<mprotect>. |
1684 | |
1909 | |
… | |
… | |
1746 | Calls the C<munlockall> function. |
1971 | Calls the C<munlockall> function. |
1747 | |
1972 | |
1748 | On systems that do not implement C<munlockall>, this function returns |
1973 | On systems that do not implement C<munlockall>, this function returns |
1749 | ENOSYS, otherwise the return value of C<munlockall>. |
1974 | ENOSYS, otherwise the return value of C<munlockall>. |
1750 | |
1975 | |
|
|
1976 | =item IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
|
|
1977 | |
|
|
1978 | Calls the GNU/Linux C<splice(2)> syscall, if available. If C<$r_off> or |
|
|
1979 | C<$w_off> are C<undef>, then C<NULL> is passed for these, otherwise they |
|
|
1980 | should be the file offset. |
|
|
1981 | |
|
|
1982 | The following symbol flag values are available: C<IO::AIO::SPLICE_F_MOVE>, |
|
|
1983 | C<IO::AIO::SPLICE_F_NONBLOCK>, C<IO::AIO::SPLICE_F_MORE> and |
|
|
1984 | C<IO::AIO::SPLICE_F_GIFT>. |
|
|
1985 | |
|
|
1986 | See the C<splice(2)> manpage for details. |
|
|
1987 | |
|
|
1988 | =item IO::AIO::tee $r_fh, $w_fh, $length, $flags |
|
|
1989 | |
|
|
1990 | Calls the GNU/Linux C<tee(2)> syscall, see it's manpage and the |
|
|
1991 | description for C<IO::AIO::splice> above for details. |
|
|
1992 | |
1751 | =back |
1993 | =back |
1752 | |
1994 | |
1753 | =cut |
1995 | =cut |
1754 | |
1996 | |
1755 | min_parallel 8; |
1997 | min_parallel 8; |
… | |
… | |
1789 | Danga::Socket->AddOtherFds (IO::AIO::poll_fileno => |
2031 | Danga::Socket->AddOtherFds (IO::AIO::poll_fileno => |
1790 | \&IO::AIO::poll_cb); |
2032 | \&IO::AIO::poll_cb); |
1791 | |
2033 | |
1792 | =head2 FORK BEHAVIOUR |
2034 | =head2 FORK BEHAVIOUR |
1793 | |
2035 | |
1794 | This module should do "the right thing" when the process using it forks: |
2036 | Usage of pthreads in a program changes the semantics of fork |
|
|
2037 | considerably. Specifically, only async-safe functions can be called after |
|
|
2038 | fork. Perl doesn't know about this, so in general, you cannot call fork |
|
|
2039 | with defined behaviour in perl if pthreads are involved. IO::AIO uses |
|
|
2040 | pthreads, so this applies, but many other extensions and (for inexplicable |
|
|
2041 | reasons) perl itself often is linked against pthreads, so this limitation |
|
|
2042 | applies to quite a lot of perls. |
1795 | |
2043 | |
1796 | Before the fork, IO::AIO enters a quiescent state where no requests |
2044 | 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 |
2045 | 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 |
2046 | 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 | |
2047 | |
1804 | In short: the parent will, after a short pause, continue as if fork had |
2048 | 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 |
2049 | forking. You could also try to call the L<IO::AIO::reinit> function in the |
1806 | yet. |
2050 | child: |
|
|
2051 | |
|
|
2052 | =over 4 |
|
|
2053 | |
|
|
2054 | =item IO::AIO::reinit |
|
|
2055 | |
|
|
2056 | Abandons all current requests and I/O threads and simply reinitialises all |
|
|
2057 | data structures. This is not an operation supported by any standards, but |
|
|
2058 | happens to work on GNU/Linux and some newer BSD systems. |
|
|
2059 | |
|
|
2060 | The only reasonable use for this function is to call it after forking, if |
|
|
2061 | C<IO::AIO> was used in the parent. Calling it while IO::AIO is active in |
|
|
2062 | the process will result in undefined behaviour. Calling it at any time |
|
|
2063 | will also result in any undefined (by POSIX) behaviour. |
|
|
2064 | |
|
|
2065 | =back |
1807 | |
2066 | |
1808 | =head2 MEMORY USAGE |
2067 | =head2 MEMORY USAGE |
1809 | |
2068 | |
1810 | Per-request usage: |
2069 | Per-request usage: |
1811 | |
2070 | |