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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 = '4.0'; |
173 | our $VERSION = '4.15'; |
174 | |
174 | |
175 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close |
175 | our @AIO_REQ = qw(aio_sendfile aio_seek aio_read aio_write aio_open aio_close |
176 | aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx |
176 | aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx |
177 | aio_scandir aio_symlink aio_readlink aio_realpath aio_sync aio_fsync |
177 | aio_scandir aio_symlink aio_readlink aio_realpath aio_sync |
178 | aio_fdatasync aio_sync_file_range aio_fallocate |
178 | aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range aio_fallocate |
179 | aio_pathsync aio_readahead |
179 | aio_pathsync aio_readahead aio_fiemap |
180 | aio_rename aio_link aio_move aio_copy aio_group |
180 | aio_rename aio_link aio_move aio_copy aio_group |
181 | 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 |
182 | aio_chmod aio_utime aio_truncate |
182 | aio_chmod aio_utime aio_truncate |
183 | aio_msync aio_mtouch aio_mlock aio_mlockall |
183 | aio_msync aio_mtouch aio_mlock aio_mlockall |
184 | aio_statvfs); |
184 | aio_statvfs |
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185 | aio_wd); |
185 | |
186 | |
186 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
187 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
187 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
188 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
188 | min_parallel max_parallel max_idle idle_timeout |
189 | min_parallel max_parallel max_idle idle_timeout |
189 | nreqs nready npending nthreads |
190 | nreqs nready npending nthreads |
… | |
… | |
201 | |
202 | |
202 | =head1 FUNCTIONS |
203 | =head1 FUNCTIONS |
203 | |
204 | |
204 | =head2 QUICK OVERVIEW |
205 | =head2 QUICK OVERVIEW |
205 | |
206 | |
206 | This section simply lists the prototypes of the most important functions |
207 | This section simply lists the prototypes most of the functions for |
207 | for quick reference. See the following sections for function-by-function |
208 | quick reference. See the following sections for function-by-function |
208 | documentation. |
209 | documentation. |
209 | |
210 | |
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211 | aio_wd $pathname, $callback->($wd) |
210 | aio_open $pathname, $flags, $mode, $callback->($fh) |
212 | aio_open $pathname, $flags, $mode, $callback->($fh) |
211 | aio_close $fh, $callback->($status) |
213 | aio_close $fh, $callback->($status) |
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214 | aio_seek $fh,$offset,$whence, $callback->($offs) |
212 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
215 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
213 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
216 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
214 | aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
217 | aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
215 | aio_readahead $fh,$offset,$length, $callback->($retval) |
218 | aio_readahead $fh,$offset,$length, $callback->($retval) |
216 | aio_stat $fh_or_path, $callback->($status) |
219 | aio_stat $fh_or_path, $callback->($status) |
217 | aio_lstat $fh, $callback->($status) |
220 | aio_lstat $fh, $callback->($status) |
218 | aio_statvfs $fh_or_path, $callback->($statvfs) |
221 | aio_statvfs $fh_or_path, $callback->($statvfs) |
219 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
222 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
220 | 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) |
221 | aio_truncate $fh_or_path, $offset, $callback->($status) |
225 | aio_truncate $fh_or_path, $offset, $callback->($status) |
222 | aio_chmod $fh_or_path, $mode, $callback->($status) |
226 | aio_allocate $fh, $mode, $offset, $len, $callback->($status) |
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227 | aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
223 | aio_unlink $pathname, $callback->($status) |
228 | aio_unlink $pathname, $callback->($status) |
224 | aio_mknod $path, $mode, $dev, $callback->($status) |
229 | aio_mknod $pathname, $mode, $dev, $callback->($status) |
225 | aio_link $srcpath, $dstpath, $callback->($status) |
230 | aio_link $srcpath, $dstpath, $callback->($status) |
226 | aio_symlink $srcpath, $dstpath, $callback->($status) |
231 | aio_symlink $srcpath, $dstpath, $callback->($status) |
227 | aio_readlink $path, $callback->($link) |
232 | aio_readlink $pathname, $callback->($link) |
228 | aio_realpath $path, $callback->($link) |
233 | aio_realpath $pathname, $callback->($link) |
229 | aio_rename $srcpath, $dstpath, $callback->($status) |
234 | aio_rename $srcpath, $dstpath, $callback->($status) |
230 | aio_mkdir $pathname, $mode, $callback->($status) |
235 | aio_mkdir $pathname, $mode, $callback->($status) |
231 | aio_rmdir $pathname, $callback->($status) |
236 | aio_rmdir $pathname, $callback->($status) |
232 | aio_readdir $pathname, $callback->($entries) |
237 | aio_readdir $pathname, $callback->($entries) |
233 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
238 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
234 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
239 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
235 | IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN |
240 | IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN |
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241 | aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs) |
236 | aio_load $path, $data, $callback->($status) |
242 | aio_load $pathname, $data, $callback->($status) |
237 | aio_copy $srcpath, $dstpath, $callback->($status) |
243 | aio_copy $srcpath, $dstpath, $callback->($status) |
238 | aio_move $srcpath, $dstpath, $callback->($status) |
244 | aio_move $srcpath, $dstpath, $callback->($status) |
239 | aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
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240 | aio_rmtree $path, $callback->($status) |
245 | aio_rmtree $pathname, $callback->($status) |
241 | aio_sync $callback->($status) |
246 | aio_sync $callback->($status) |
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247 | aio_syncfs $fh, $callback->($status) |
242 | aio_fsync $fh, $callback->($status) |
248 | aio_fsync $fh, $callback->($status) |
243 | aio_fdatasync $fh, $callback->($status) |
249 | aio_fdatasync $fh, $callback->($status) |
244 | aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
250 | aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
245 | aio_pathsync $path, $callback->($status) |
251 | aio_pathsync $pathname, $callback->($status) |
246 | aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
252 | aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
247 | aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
253 | aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
248 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
254 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
249 | aio_mlockall $flags, $callback->($status) |
255 | aio_mlockall $flags, $callback->($status) |
250 | aio_group $callback->(...) |
256 | aio_group $callback->(...) |
… | |
… | |
268 | IO::AIO::nready |
274 | IO::AIO::nready |
269 | IO::AIO::npending |
275 | IO::AIO::npending |
270 | |
276 | |
271 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
277 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
272 | IO::AIO::fadvise $fh, $offset, $len, $advice |
278 | IO::AIO::fadvise $fh, $offset, $len, $advice |
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279 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
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280 | IO::AIO::munmap $scalar |
273 | IO::AIO::madvise $scalar, $offset, $length, $advice |
281 | IO::AIO::madvise $scalar, $offset, $length, $advice |
274 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
282 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
275 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
283 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
276 | IO::AIO::munlockall |
284 | IO::AIO::munlockall |
277 | |
285 | |
278 | =head2 AIO REQUEST FUNCTIONS |
286 | =head2 API NOTES |
279 | |
287 | |
280 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
288 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
281 | with the same name (sans C<aio_>). The arguments are similar or identical, |
289 | with the same name (sans C<aio_>). The arguments are similar or identical, |
282 | and they all accept an additional (and optional) C<$callback> argument |
290 | and they all accept an additional (and optional) C<$callback> argument |
283 | which must be a code reference. This code reference will get called with |
291 | which must be a code reference. This code reference will be called after |
284 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
292 | the syscall has been executed in an asynchronous fashion. The results |
285 | perl, which usually delivers "false") as its sole argument after the given |
293 | of the request will be passed as arguments to the callback (and, if an |
286 | syscall has been executed asynchronously. |
294 | error occured, in C<$!>) - for most requests the syscall return code (e.g. |
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295 | most syscalls return C<-1> on error, unlike perl, which usually delivers |
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296 | "false"). |
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297 | |
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298 | Some requests (such as C<aio_readdir>) pass the actual results and |
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299 | communicate failures by passing C<undef>. |
287 | |
300 | |
288 | All functions expecting a filehandle keep a copy of the filehandle |
301 | All functions expecting a filehandle keep a copy of the filehandle |
289 | internally until the request has finished. |
302 | internally until the request has finished. |
290 | |
303 | |
291 | All functions return request objects of type L<IO::AIO::REQ> that allow |
304 | All functions return request objects of type L<IO::AIO::REQ> that allow |
292 | further manipulation of those requests while they are in-flight. |
305 | further manipulation of those requests while they are in-flight. |
293 | |
306 | |
294 | The pathnames you pass to these routines I<must> be absolute and |
307 | The pathnames you pass to these routines I<should> be absolute. The |
295 | encoded as octets. The reason for the former is that at the time the |
308 | reason for this is that at the time the request is being executed, the |
296 | request is being executed, the current working directory could have |
309 | current working directory could have changed. Alternatively, you can |
297 | changed. Alternatively, you can make sure that you never change the |
310 | make sure that you never change the current working directory anywhere |
298 | current working directory anywhere in the program and then use relative |
311 | in the program and then use relative paths. You can also take advantage |
299 | paths. |
312 | of IO::AIOs working directory abstraction, that lets you specify paths |
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313 | relative to some previously-opened "working directory object" - see the |
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314 | description of the C<IO::AIO::WD> class later in this document. |
300 | |
315 | |
301 | To encode pathnames as octets, either make sure you either: a) always pass |
316 | To encode pathnames as octets, either make sure you either: a) always pass |
302 | in filenames you got from outside (command line, readdir etc.) without |
317 | in filenames you got from outside (command line, readdir etc.) without |
303 | tinkering, b) are ASCII or ISO 8859-1, c) use the Encode module and encode |
318 | tinkering, b) are in your native filesystem encoding, c) use the Encode |
304 | your pathnames to the locale (or other) encoding in effect in the user |
319 | module and encode your pathnames to the locale (or other) encoding in |
305 | environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
320 | effect in the user environment, d) use Glib::filename_from_unicode on |
306 | use something else to ensure your scalar has the correct contents. |
321 | unicode filenames or e) use something else to ensure your scalar has the |
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322 | correct contents. |
307 | |
323 | |
308 | This works, btw. independent of the internal UTF-8 bit, which IO::AIO |
324 | This works, btw. independent of the internal UTF-8 bit, which IO::AIO |
309 | handles correctly whether it is set or not. |
325 | handles correctly whether it is set or not. |
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326 | |
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327 | =head2 AIO REQUEST FUNCTIONS |
310 | |
328 | |
311 | =over 4 |
329 | =over 4 |
312 | |
330 | |
313 | =item $prev_pri = aioreq_pri [$pri] |
331 | =item $prev_pri = aioreq_pri [$pri] |
314 | |
332 | |
… | |
… | |
396 | |
414 | |
397 | Or in other words: the file descriptor will be closed, but it will not be |
415 | Or in other words: the file descriptor will be closed, but it will not be |
398 | free for reuse until the perl filehandle is closed. |
416 | free for reuse until the perl filehandle is closed. |
399 | |
417 | |
400 | =cut |
418 | =cut |
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419 | |
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420 | =item aio_seek $fh, $offset, $whence, $callback->($offs) |
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421 | |
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422 | Seeks the filehandle to the new C<$offset>, similarly to perl's |
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423 | C<sysseek>. The C<$whence> can use the traditional values (C<0> for |
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424 | C<IO::AIO::SEEK_SET>, C<1> for C<IO::AIO::SEEK_CUR> or C<2> for |
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425 | C<IO::AIO::SEEK_END>). |
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426 | |
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427 | The resulting absolute offset will be passed to the callback, or C<-1> in |
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428 | case of an error. |
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429 | |
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430 | In theory, the C<$whence> constants could be different than the |
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431 | corresponding values from L<Fcntl>, but perl guarantees they are the same, |
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432 | so don't panic. |
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433 | |
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434 | As a GNU/Linux (and maybe Solaris) extension, also the constants |
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435 | C<IO::AIO::SEEK_DATA> and C<IO::AIO::SEEK_HOLE> are available, if they |
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436 | could be found. No guarantees about suitability for use in C<aio_seek> or |
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437 | Perl's C<sysseek> can be made though, although I would naively assume they |
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438 | "just work". |
401 | |
439 | |
402 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
440 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
403 | |
441 | |
404 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
442 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
405 | |
443 | |
… | |
… | |
602 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
640 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
603 | |
641 | |
604 | Works like truncate(2) or ftruncate(2). |
642 | Works like truncate(2) or ftruncate(2). |
605 | |
643 | |
606 | |
644 | |
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645 | =item aio_allocate $fh, $mode, $offset, $len, $callback->($status) |
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646 | |
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647 | Allocates or freed disk space according to the C<$mode> argument. See the |
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648 | linux C<fallocate> docuemntation for details. |
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649 | |
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650 | C<$mode> can currently be C<0> or C<IO::AIO::FALLOC_FL_KEEP_SIZE> |
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651 | to allocate space, or C<IO::AIO::FALLOC_FL_PUNCH_HOLE | |
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652 | IO::AIO::FALLOC_FL_KEEP_SIZE>, to deallocate a file range. |
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653 | |
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654 | The file system block size used by C<fallocate> is presumably the |
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655 | C<f_bsize> returned by C<statvfs>. |
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656 | |
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657 | If C<fallocate> isn't available or cannot be emulated (currently no |
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658 | emulation will be attempted), passes C<-1> and sets C<$!> to C<ENOSYS>. |
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659 | |
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660 | |
607 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
661 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
608 | |
662 | |
609 | Works like perl's C<chmod> function. |
663 | Works like perl's C<chmod> function. |
610 | |
664 | |
611 | |
665 | |
… | |
… | |
613 | |
667 | |
614 | Asynchronously unlink (delete) a file and call the callback with the |
668 | Asynchronously unlink (delete) a file and call the callback with the |
615 | result code. |
669 | result code. |
616 | |
670 | |
617 | |
671 | |
618 | =item aio_mknod $path, $mode, $dev, $callback->($status) |
672 | =item aio_mknod $pathname, $mode, $dev, $callback->($status) |
619 | |
673 | |
620 | [EXPERIMENTAL] |
674 | [EXPERIMENTAL] |
621 | |
675 | |
622 | Asynchronously create a device node (or fifo). See mknod(2). |
676 | Asynchronously create a device node (or fifo). See mknod(2). |
623 | |
677 | |
624 | The only (POSIX-) portable way of calling this function is: |
678 | The only (POSIX-) portable way of calling this function is: |
625 | |
679 | |
626 | aio_mknod $path, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
680 | aio_mknod $pathname, IO::AIO::S_IFIFO | $mode, 0, sub { ... |
627 | |
681 | |
628 | See C<aio_stat> for info about some potentially helpful extra constants |
682 | See C<aio_stat> for info about some potentially helpful extra constants |
629 | and functions. |
683 | and functions. |
630 | |
684 | |
631 | =item aio_link $srcpath, $dstpath, $callback->($status) |
685 | =item aio_link $srcpath, $dstpath, $callback->($status) |
… | |
… | |
638 | |
692 | |
639 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
693 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
640 | the path C<$dstpath> and call the callback with the result code. |
694 | the path C<$dstpath> and call the callback with the result code. |
641 | |
695 | |
642 | |
696 | |
643 | =item aio_readlink $path, $callback->($link) |
697 | =item aio_readlink $pathname, $callback->($link) |
644 | |
698 | |
645 | Asynchronously read the symlink specified by C<$path> and pass it to |
699 | Asynchronously read the symlink specified by C<$path> and pass it to |
646 | the callback. If an error occurs, nothing or undef gets passed to the |
700 | the callback. If an error occurs, nothing or undef gets passed to the |
647 | callback. |
701 | callback. |
648 | |
702 | |
649 | |
703 | |
650 | =item aio_realpath $path, $callback->($path) |
704 | =item aio_realpath $pathname, $callback->($path) |
651 | |
705 | |
652 | Asynchronously make the path absolute and resolve any symlinks in |
706 | Asynchronously make the path absolute and resolve any symlinks in |
653 | C<$path>. The resulting path only consists of directories (Same as |
707 | C<$path>. The resulting path only consists of directories (Same as |
654 | L<Cwd::realpath>). |
708 | L<Cwd::realpath>). |
655 | |
709 | |
… | |
… | |
686 | array-ref with the filenames. |
740 | array-ref with the filenames. |
687 | |
741 | |
688 | |
742 | |
689 | =item aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
743 | =item aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
690 | |
744 | |
691 | Quite similar to C<aio_readdir>, but the C<$flags> argument allows to tune |
745 | Quite similar to C<aio_readdir>, but the C<$flags> argument allows one to |
692 | behaviour and output format. In case of an error, C<$entries> will be |
746 | tune behaviour and output format. In case of an error, C<$entries> will be |
693 | C<undef>. |
747 | C<undef>. |
694 | |
748 | |
695 | The flags are a combination of the following constants, ORed together (the |
749 | The flags are a combination of the following constants, ORed together (the |
696 | flags will also be passed to the callback, possibly modified): |
750 | flags will also be passed to the callback, possibly modified): |
697 | |
751 | |
… | |
… | |
744 | |
798 | |
745 | =item IO::AIO::READDIR_FOUND_UNKNOWN |
799 | =item IO::AIO::READDIR_FOUND_UNKNOWN |
746 | |
800 | |
747 | This flag should not be set when calling C<aio_readdirx>. Instead, it |
801 | This flag should not be set when calling C<aio_readdirx>. Instead, it |
748 | is being set by C<aio_readdirx>, when any of the C<$type>'s found were |
802 | is being set by C<aio_readdirx>, when any of the C<$type>'s found were |
749 | C<IO::AIO::DT_UNKNOWN>. The absense of this flag therefore indicates that all |
803 | C<IO::AIO::DT_UNKNOWN>. The absence of this flag therefore indicates that all |
750 | C<$type>'s are known, which can be used to speed up some algorithms. |
804 | C<$type>'s are known, which can be used to speed up some algorithms. |
751 | |
805 | |
752 | =back |
806 | =back |
753 | |
807 | |
754 | |
808 | |
755 | =item aio_load $path, $data, $callback->($status) |
809 | =item aio_load $pathname, $data, $callback->($status) |
756 | |
810 | |
757 | This is a composite request that tries to fully load the given file into |
811 | This is a composite request that tries to fully load the given file into |
758 | memory. Status is the same as with aio_read. |
812 | memory. Status is the same as with aio_read. |
759 | |
813 | |
760 | =cut |
814 | =cut |
… | |
… | |
895 | }; |
949 | }; |
896 | |
950 | |
897 | $grp |
951 | $grp |
898 | } |
952 | } |
899 | |
953 | |
900 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
954 | =item aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs) |
901 | |
955 | |
902 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
956 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
903 | efficiently separate the entries of directory C<$path> into two sets of |
957 | efficiently separate the entries of directory C<$path> into two sets of |
904 | names, directories you can recurse into (directories), and ones you cannot |
958 | names, directories you can recurse into (directories), and ones you cannot |
905 | recurse into (everything else, including symlinks to directories). |
959 | recurse into (everything else, including symlinks to directories). |
… | |
… | |
936 | Then entries will be sorted into likely directories a non-initial dot |
990 | Then entries will be sorted into likely directories a non-initial dot |
937 | currently) and likely non-directories (see C<aio_readdirx>). Then every |
991 | currently) and likely non-directories (see C<aio_readdirx>). Then every |
938 | entry plus an appended C</.> will be C<stat>'ed, likely directories first, |
992 | entry plus an appended C</.> will be C<stat>'ed, likely directories first, |
939 | in order of their inode numbers. If that succeeds, it assumes that the |
993 | in order of their inode numbers. If that succeeds, it assumes that the |
940 | entry is a directory or a symlink to directory (which will be checked |
994 | entry is a directory or a symlink to directory (which will be checked |
941 | seperately). This is often faster than stat'ing the entry itself because |
995 | separately). This is often faster than stat'ing the entry itself because |
942 | filesystems might detect the type of the entry without reading the inode |
996 | filesystems might detect the type of the entry without reading the inode |
943 | data (e.g. ext2fs filetype feature), even on systems that cannot return |
997 | data (e.g. ext2fs filetype feature), even on systems that cannot return |
944 | the filetype information on readdir. |
998 | the filetype information on readdir. |
945 | |
999 | |
946 | If the known number of directories (link count - 2) has been reached, the |
1000 | If the known number of directories (link count - 2) has been reached, the |
… | |
… | |
962 | |
1016 | |
963 | my $grp = aio_group $cb; |
1017 | my $grp = aio_group $cb; |
964 | |
1018 | |
965 | $maxreq = 4 if $maxreq <= 0; |
1019 | $maxreq = 4 if $maxreq <= 0; |
966 | |
1020 | |
967 | # stat once |
1021 | # get a wd object |
968 | aioreq_pri $pri; |
1022 | aioreq_pri $pri; |
969 | add $grp aio_stat $path, sub { |
1023 | add $grp aio_wd $path, sub { |
|
|
1024 | $_[0] |
970 | return $grp->result () if $_[0]; |
1025 | or return $grp->result (); |
971 | my $now = time; |
|
|
972 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
973 | |
1026 | |
974 | # read the directory entries |
1027 | my $wd = [shift, "."]; |
|
|
1028 | |
|
|
1029 | # stat once |
975 | aioreq_pri $pri; |
1030 | aioreq_pri $pri; |
976 | add $grp aio_readdirx $path, READDIR_DIRS_FIRST, sub { |
1031 | add $grp aio_stat $wd, sub { |
977 | my $entries = shift |
|
|
978 | or return $grp->result (); |
1032 | return $grp->result () if $_[0]; |
|
|
1033 | my $now = time; |
|
|
1034 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
979 | |
1035 | |
980 | # stat the dir another time |
1036 | # read the directory entries |
981 | aioreq_pri $pri; |
1037 | aioreq_pri $pri; |
|
|
1038 | add $grp aio_readdirx $wd, READDIR_DIRS_FIRST, sub { |
|
|
1039 | my $entries = shift |
|
|
1040 | or return $grp->result (); |
|
|
1041 | |
|
|
1042 | # stat the dir another time |
|
|
1043 | aioreq_pri $pri; |
982 | add $grp aio_stat $path, sub { |
1044 | add $grp aio_stat $wd, sub { |
983 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
1045 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
984 | |
1046 | |
985 | my $ndirs; |
1047 | my $ndirs; |
986 | |
1048 | |
987 | # take the slow route if anything looks fishy |
1049 | # take the slow route if anything looks fishy |
988 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
1050 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
989 | $ndirs = -1; |
1051 | $ndirs = -1; |
990 | } else { |
1052 | } else { |
991 | # if nlink == 2, we are finished |
1053 | # if nlink == 2, we are finished |
992 | # for non-posix-fs's, we rely on nlink < 2 |
1054 | # for non-posix-fs's, we rely on nlink < 2 |
993 | $ndirs = (stat _)[3] - 2 |
1055 | $ndirs = (stat _)[3] - 2 |
994 | or return $grp->result ([], $entries); |
1056 | or return $grp->result ([], $entries); |
995 | } |
1057 | } |
996 | |
1058 | |
997 | my (@dirs, @nondirs); |
1059 | my (@dirs, @nondirs); |
998 | |
1060 | |
999 | my $statgrp = add $grp aio_group sub { |
1061 | my $statgrp = add $grp aio_group sub { |
1000 | $grp->result (\@dirs, \@nondirs); |
1062 | $grp->result (\@dirs, \@nondirs); |
1001 | }; |
1063 | }; |
1002 | |
1064 | |
1003 | limit $statgrp $maxreq; |
1065 | limit $statgrp $maxreq; |
1004 | feed $statgrp sub { |
1066 | feed $statgrp sub { |
1005 | return unless @$entries; |
1067 | return unless @$entries; |
1006 | my $entry = shift @$entries; |
1068 | my $entry = shift @$entries; |
1007 | |
1069 | |
1008 | aioreq_pri $pri; |
1070 | aioreq_pri $pri; |
|
|
1071 | $wd->[1] = "$entry/."; |
1009 | add $statgrp aio_stat "$path/$entry/.", sub { |
1072 | add $statgrp aio_stat $wd, sub { |
1010 | if ($_[0] < 0) { |
1073 | if ($_[0] < 0) { |
1011 | push @nondirs, $entry; |
1074 | push @nondirs, $entry; |
1012 | } else { |
1075 | } else { |
1013 | # need to check for real directory |
1076 | # need to check for real directory |
1014 | aioreq_pri $pri; |
1077 | aioreq_pri $pri; |
|
|
1078 | $wd->[1] = $entry; |
1015 | add $statgrp aio_lstat "$path/$entry", sub { |
1079 | add $statgrp aio_lstat $wd, sub { |
1016 | if (-d _) { |
1080 | if (-d _) { |
1017 | push @dirs, $entry; |
1081 | push @dirs, $entry; |
1018 | |
1082 | |
1019 | unless (--$ndirs) { |
1083 | unless (--$ndirs) { |
1020 | push @nondirs, @$entries; |
1084 | push @nondirs, @$entries; |
1021 | feed $statgrp; |
1085 | feed $statgrp; |
|
|
1086 | } |
|
|
1087 | } else { |
|
|
1088 | push @nondirs, $entry; |
1022 | } |
1089 | } |
1023 | } else { |
|
|
1024 | push @nondirs, $entry; |
|
|
1025 | } |
1090 | } |
1026 | } |
1091 | } |
1027 | } |
1092 | }; |
1028 | }; |
1093 | }; |
1029 | }; |
1094 | }; |
1030 | }; |
1095 | }; |
1031 | }; |
1096 | }; |
1032 | }; |
1097 | }; |
1033 | |
1098 | |
1034 | $grp |
1099 | $grp |
1035 | } |
1100 | } |
1036 | |
1101 | |
1037 | =item aio_rmtree $path, $callback->($status) |
1102 | =item aio_rmtree $pathname, $callback->($status) |
1038 | |
1103 | |
1039 | Delete a directory tree starting (and including) C<$path>, return the |
1104 | Delete a directory tree starting (and including) C<$path>, return the |
1040 | status of the final C<rmdir> only. This is a composite request that |
1105 | status of the final C<rmdir> only. This is a composite request that |
1041 | uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
1106 | uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
1042 | everything else. |
1107 | everything else. |
… | |
… | |
1084 | callback with the fdatasync result code. |
1149 | callback with the fdatasync result code. |
1085 | |
1150 | |
1086 | If this call isn't available because your OS lacks it or it couldn't be |
1151 | If this call isn't available because your OS lacks it or it couldn't be |
1087 | detected, it will be emulated by calling C<fsync> instead. |
1152 | detected, it will be emulated by calling C<fsync> instead. |
1088 | |
1153 | |
|
|
1154 | =item aio_syncfs $fh, $callback->($status) |
|
|
1155 | |
|
|
1156 | Asynchronously call the syncfs syscall to sync the filesystem associated |
|
|
1157 | to the given filehandle and call the callback with the syncfs result |
|
|
1158 | code. If syncfs is not available, calls sync(), but returns C<-1> and sets |
|
|
1159 | errno to C<ENOSYS> nevertheless. |
|
|
1160 | |
1089 | =item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
1161 | =item aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
1090 | |
1162 | |
1091 | Sync the data portion of the file specified by C<$offset> and C<$length> |
1163 | Sync the data portion of the file specified by C<$offset> and C<$length> |
1092 | to disk (but NOT the metadata), by calling the Linux-specific |
1164 | to disk (but NOT the metadata), by calling the Linux-specific |
1093 | sync_file_range call. If sync_file_range is not available or it returns |
1165 | sync_file_range call. If sync_file_range is not available or it returns |
… | |
… | |
1096 | C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>, |
1168 | C<$flags> can be a combination of C<IO::AIO::SYNC_FILE_RANGE_WAIT_BEFORE>, |
1097 | C<IO::AIO::SYNC_FILE_RANGE_WRITE> and |
1169 | C<IO::AIO::SYNC_FILE_RANGE_WRITE> and |
1098 | C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range |
1170 | C<IO::AIO::SYNC_FILE_RANGE_WAIT_AFTER>: refer to the sync_file_range |
1099 | manpage for details. |
1171 | manpage for details. |
1100 | |
1172 | |
1101 | =item aio_pathsync $path, $callback->($status) |
1173 | =item aio_pathsync $pathname, $callback->($status) |
1102 | |
1174 | |
1103 | This request tries to open, fsync and close the given path. This is a |
1175 | This request tries to open, fsync and close the given path. This is a |
1104 | composite request intended to sync directories after directory operations |
1176 | composite request intended to sync directories after directory operations |
1105 | (E.g. rename). This might not work on all operating systems or have any |
1177 | (E.g. rename). This might not work on all operating systems or have any |
1106 | specific effect, but usually it makes sure that directory changes get |
1178 | specific effect, but usually it makes sure that directory changes get |
… | |
… | |
1203 | |
1275 | |
1204 | Example: asynchronously lock all current and future pages into memory. |
1276 | Example: asynchronously lock all current and future pages into memory. |
1205 | |
1277 | |
1206 | aio_mlockall IO::AIO::MCL_FUTURE; |
1278 | aio_mlockall IO::AIO::MCL_FUTURE; |
1207 | |
1279 | |
|
|
1280 | =item aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
|
|
1281 | |
|
|
1282 | Queries the extents of the given file (by calling the Linux FIEMAP ioctl, |
|
|
1283 | see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If the |
|
|
1284 | C<ioctl> is not available on your OS, then this request will fail with |
|
|
1285 | C<ENOSYS>. |
|
|
1286 | |
|
|
1287 | C<$start> is the starting offset to query extents for, C<$length> is the |
|
|
1288 | size of the range to query - if it is C<undef>, then the whole file will |
|
|
1289 | be queried. |
|
|
1290 | |
|
|
1291 | C<$flags> is a combination of flags (C<IO::AIO::FIEMAP_FLAG_SYNC> or |
|
|
1292 | C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also |
|
|
1293 | exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query |
|
|
1294 | the data portion. |
|
|
1295 | |
|
|
1296 | C<$count> is the maximum number of extent records to return. If it is |
|
|
1297 | C<undef>, then IO::AIO queries all extents of the range. As a very special |
|
|
1298 | case, if it is C<0>, then the callback receives the number of extents |
|
|
1299 | instead of the extents themselves (which is unreliable, see below). |
|
|
1300 | |
|
|
1301 | If an error occurs, the callback receives no arguments. The special |
|
|
1302 | C<errno> value C<IO::AIO::EBADR> is available to test for flag errors. |
|
|
1303 | |
|
|
1304 | Otherwise, the callback receives an array reference with extent |
|
|
1305 | structures. Each extent structure is an array reference itself, with the |
|
|
1306 | following members: |
|
|
1307 | |
|
|
1308 | [$logical, $physical, $length, $flags] |
|
|
1309 | |
|
|
1310 | Flags is any combination of the following flag values (typically either C<0> |
|
|
1311 | or C<IO::AIO::FIEMAP_EXTENT_LAST> (1)): |
|
|
1312 | |
|
|
1313 | C<IO::AIO::FIEMAP_EXTENT_LAST>, C<IO::AIO::FIEMAP_EXTENT_UNKNOWN>, |
|
|
1314 | C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>, |
|
|
1315 | C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>, |
|
|
1316 | C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>, |
|
|
1317 | C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or |
|
|
1318 | C<IO::AIO::FIEMAP_EXTENT_SHARED>. |
|
|
1319 | |
|
|
1320 | At the time of this writing (Linux 3.2), this requets is unreliable unless |
|
|
1321 | C<$count> is C<undef>, as the kernel has all sorts of bugs preventing |
|
|
1322 | it to return all extents of a range for files with large number of |
|
|
1323 | extents. The code works around all these issues if C<$count> is undef. |
|
|
1324 | |
1208 | =item aio_group $callback->(...) |
1325 | =item aio_group $callback->(...) |
1209 | |
1326 | |
1210 | This is a very special aio request: Instead of doing something, it is a |
1327 | This is a very special aio request: Instead of doing something, it is a |
1211 | container for other aio requests, which is useful if you want to bundle |
1328 | container for other aio requests, which is useful if you want to bundle |
1212 | many requests into a single, composite, request with a definite callback |
1329 | many requests into a single, composite, request with a definite callback |
… | |
… | |
1248 | like sleep and file handle readable/writable, the overhead this creates is |
1365 | like sleep and file handle readable/writable, the overhead this creates is |
1249 | immense (it blocks a thread for a long time) so do not use this function |
1366 | immense (it blocks a thread for a long time) so do not use this function |
1250 | except to put your application under artificial I/O pressure. |
1367 | except to put your application under artificial I/O pressure. |
1251 | |
1368 | |
1252 | =back |
1369 | =back |
|
|
1370 | |
|
|
1371 | |
|
|
1372 | =head2 IO::AIO::WD - multiple working directories |
|
|
1373 | |
|
|
1374 | Your process only has one current working directory, which is used by all |
|
|
1375 | threads. This makes it hard to use relative paths (some other component |
|
|
1376 | could call C<chdir> at any time, and it is hard to control when the path |
|
|
1377 | will be used by IO::AIO). |
|
|
1378 | |
|
|
1379 | One solution for this is to always use absolute paths. This usually works, |
|
|
1380 | but can be quite slow (the kernel has to walk the whole path on every |
|
|
1381 | access), and can also be a hassle to implement. |
|
|
1382 | |
|
|
1383 | Newer POSIX systems have a number of functions (openat, fdopendir, |
|
|
1384 | futimensat and so on) that make it possible to specify working directories |
|
|
1385 | per operation. |
|
|
1386 | |
|
|
1387 | For portability, and because the clowns who "designed", or shall I write, |
|
|
1388 | perpetrated this new interface were obviously half-drunk, this abstraction |
|
|
1389 | cannot be perfect, though. |
|
|
1390 | |
|
|
1391 | IO::AIO allows you to convert directory paths into a so-called IO::AIO::WD |
|
|
1392 | object. This object stores the canonicalised, absolute version of the |
|
|
1393 | path, and on systems that allow it, also a directory file descriptor. |
|
|
1394 | |
|
|
1395 | Everywhere where a pathname is accepted by IO::AIO (e.g. in C<aio_stat> |
|
|
1396 | or C<aio_unlink>), one can specify an array reference with an IO::AIO::WD |
|
|
1397 | object and a pathname instead (or the IO::AIO::WD object alone, which |
|
|
1398 | gets interpreted as C<[$wd, "."]>). If the pathname is absolute, the |
|
|
1399 | IO::AIO::WD object is ignored, otherwise the pathname is resolved relative |
|
|
1400 | to that IO::AIO::WD object. |
|
|
1401 | |
|
|
1402 | For example, to get a wd object for F</etc> and then stat F<passwd> |
|
|
1403 | inside, you would write: |
|
|
1404 | |
|
|
1405 | aio_wd "/etc", sub { |
|
|
1406 | my $etcdir = shift; |
|
|
1407 | |
|
|
1408 | # although $etcdir can be undef on error, there is generally no reason |
|
|
1409 | # to check for errors here, as aio_stat will fail with ENOENT |
|
|
1410 | # when $etcdir is undef. |
|
|
1411 | |
|
|
1412 | aio_stat [$etcdir, "passwd"], sub { |
|
|
1413 | # yay |
|
|
1414 | }; |
|
|
1415 | }; |
|
|
1416 | |
|
|
1417 | That C<aio_wd> is a request and not a normal function shows that creating |
|
|
1418 | an IO::AIO::WD object is itself a potentially blocking operation, which is |
|
|
1419 | why it is done asynchronously. |
|
|
1420 | |
|
|
1421 | To stat the directory obtained with C<aio_wd> above, one could write |
|
|
1422 | either of the following three request calls: |
|
|
1423 | |
|
|
1424 | aio_lstat "/etc" , sub { ... # pathname as normal string |
|
|
1425 | aio_lstat [$wd, "."], sub { ... # "." relative to $wd (i.e. $wd itself) |
|
|
1426 | aio_lstat $wd , sub { ... # shorthand for the previous |
|
|
1427 | |
|
|
1428 | As with normal pathnames, IO::AIO keeps a copy of the working directory |
|
|
1429 | object and the pathname string, so you could write the following without |
|
|
1430 | causing any issues due to C<$path> getting reused: |
|
|
1431 | |
|
|
1432 | my $path = [$wd, undef]; |
|
|
1433 | |
|
|
1434 | for my $name (qw(abc def ghi)) { |
|
|
1435 | $path->[1] = $name; |
|
|
1436 | aio_stat $path, sub { |
|
|
1437 | # ... |
|
|
1438 | }; |
|
|
1439 | } |
|
|
1440 | |
|
|
1441 | There are some caveats: when directories get renamed (or deleted), the |
|
|
1442 | pathname string doesn't change, so will point to the new directory (or |
|
|
1443 | nowhere at all), while the directory fd, if available on the system, |
|
|
1444 | will still point to the original directory. Most functions accepting a |
|
|
1445 | pathname will use the directory fd on newer systems, and the string on |
|
|
1446 | older systems. Some functions (such as realpath) will always rely on the |
|
|
1447 | string form of the pathname. |
|
|
1448 | |
|
|
1449 | So this fucntionality is mainly useful to get some protection against |
|
|
1450 | C<chdir>, to easily get an absolute path out of a relative path for future |
|
|
1451 | reference, and to speed up doing many operations in the same directory |
|
|
1452 | (e.g. when stat'ing all files in a directory). |
|
|
1453 | |
|
|
1454 | The following functions implement this working directory abstraction: |
|
|
1455 | |
|
|
1456 | =over 4 |
|
|
1457 | |
|
|
1458 | =item aio_wd $pathname, $callback->($wd) |
|
|
1459 | |
|
|
1460 | Asynchonously canonicalise the given pathname and convert it to an |
|
|
1461 | IO::AIO::WD object representing it. If possible and supported on the |
|
|
1462 | system, also open a directory fd to speed up pathname resolution relative |
|
|
1463 | to this working directory. |
|
|
1464 | |
|
|
1465 | If something goes wrong, then C<undef> is passwd to the callback instead |
|
|
1466 | of a working directory object and C<$!> is set appropriately. Since |
|
|
1467 | passing C<undef> as working directory component of a pathname fails the |
|
|
1468 | request with C<ENOENT>, there is often no need for error checking in the |
|
|
1469 | C<aio_wd> callback, as future requests using the value will fail in the |
|
|
1470 | expected way. |
|
|
1471 | |
|
|
1472 | If this call isn't available because your OS lacks it or it couldn't be |
|
|
1473 | detected, it will be emulated by calling C<fsync> instead. |
|
|
1474 | |
|
|
1475 | =item IO::AIO::CWD |
|
|
1476 | |
|
|
1477 | This is a compiletime constant (object) that represents the process |
|
|
1478 | current working directory. |
|
|
1479 | |
|
|
1480 | Specifying this object as working directory object for a pathname is as |
|
|
1481 | if the pathname would be specified directly, without a directory object, |
|
|
1482 | e.g., these calls are functionally identical: |
|
|
1483 | |
|
|
1484 | aio_stat "somefile", sub { ... }; |
|
|
1485 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
|
|
1486 | |
|
|
1487 | =back |
|
|
1488 | |
1253 | |
1489 | |
1254 | =head2 IO::AIO::REQ CLASS |
1490 | =head2 IO::AIO::REQ CLASS |
1255 | |
1491 | |
1256 | All non-aggregate C<aio_*> functions return an object of this class when |
1492 | All non-aggregate C<aio_*> functions return an object of this class when |
1257 | called in non-void context. |
1493 | called in non-void context. |
… | |
… | |
1375 | |
1611 | |
1376 | Sets a feeder/generator on this group: every group can have an attached |
1612 | Sets a feeder/generator on this group: every group can have an attached |
1377 | generator that generates requests if idle. The idea behind this is that, |
1613 | generator that generates requests if idle. The idea behind this is that, |
1378 | although you could just queue as many requests as you want in a group, |
1614 | although you could just queue as many requests as you want in a group, |
1379 | this might starve other requests for a potentially long time. For example, |
1615 | this might starve other requests for a potentially long time. For example, |
1380 | C<aio_scandir> might generate hundreds of thousands C<aio_stat> requests, |
1616 | C<aio_scandir> might generate hundreds of thousands of C<aio_stat> |
1381 | delaying any later requests for a long time. |
1617 | requests, delaying any later requests for a long time. |
1382 | |
1618 | |
1383 | To avoid this, and allow incremental generation of requests, you can |
1619 | To avoid this, and allow incremental generation of requests, you can |
1384 | instead a group and set a feeder on it that generates those requests. The |
1620 | instead a group and set a feeder on it that generates those requests. The |
1385 | feed callback will be called whenever there are few enough (see C<limit>, |
1621 | feed callback will be called whenever there are few enough (see C<limit>, |
1386 | below) requests active in the group itself and is expected to queue more |
1622 | below) requests active in the group itself and is expected to queue more |
… | |
… | |
1665 | |
1901 | |
1666 | =item IO::AIO::fadvise $fh, $offset, $len, $advice |
1902 | =item IO::AIO::fadvise $fh, $offset, $len, $advice |
1667 | |
1903 | |
1668 | Simply calls the C<posix_fadvise> function (see its |
1904 | Simply calls the C<posix_fadvise> function (see its |
1669 | manpage for details). The following advice constants are |
1905 | manpage for details). The following advice constants are |
1670 | avaiable: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>, |
1906 | available: C<IO::AIO::FADV_NORMAL>, C<IO::AIO::FADV_SEQUENTIAL>, |
1671 | C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>, |
1907 | C<IO::AIO::FADV_RANDOM>, C<IO::AIO::FADV_NOREUSE>, |
1672 | C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>. |
1908 | C<IO::AIO::FADV_WILLNEED>, C<IO::AIO::FADV_DONTNEED>. |
1673 | |
1909 | |
1674 | On systems that do not implement C<posix_fadvise>, this function returns |
1910 | On systems that do not implement C<posix_fadvise>, this function returns |
1675 | ENOSYS, otherwise the return value of C<posix_fadvise>. |
1911 | ENOSYS, otherwise the return value of C<posix_fadvise>. |
1676 | |
1912 | |
1677 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
1913 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
1678 | |
1914 | |
1679 | Simply calls the C<posix_madvise> function (see its |
1915 | Simply calls the C<posix_madvise> function (see its |
1680 | manpage for details). The following advice constants are |
1916 | manpage for details). The following advice constants are |
1681 | avaiable: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
1917 | available: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
1682 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>. |
1918 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>. |
1683 | |
1919 | |
1684 | On systems that do not implement C<posix_madvise>, this function returns |
1920 | On systems that do not implement C<posix_madvise>, this function returns |
1685 | ENOSYS, otherwise the return value of C<posix_madvise>. |
1921 | ENOSYS, otherwise the return value of C<posix_madvise>. |
1686 | |
1922 | |
1687 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
1923 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
1688 | |
1924 | |
1689 | Simply calls the C<mprotect> function on the preferably AIO::mmap'ed |
1925 | Simply calls the C<mprotect> function on the preferably AIO::mmap'ed |
1690 | $scalar (see its manpage for details). The following protect |
1926 | $scalar (see its manpage for details). The following protect |
1691 | constants are avaiable: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>, |
1927 | constants are available: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>, |
1692 | C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>. |
1928 | C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>. |
1693 | |
1929 | |
1694 | On systems that do not implement C<mprotect>, this function returns |
1930 | On systems that do not implement C<mprotect>, this function returns |
1695 | ENOSYS, otherwise the return value of C<mprotect>. |
1931 | ENOSYS, otherwise the return value of C<mprotect>. |
1696 | |
1932 | |
1697 | =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
1933 | =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
1698 | |
1934 | |
1699 | Memory-maps a file (or anonymous memory range) and attaches it to the |
1935 | Memory-maps a file (or anonymous memory range) and attaches it to the |
1700 | given C<$scalar>, which will act like a string scalar. |
1936 | given C<$scalar>, which will act like a string scalar. Returns true on |
|
|
1937 | success, and false otherwise. |
1701 | |
1938 | |
1702 | The only operations allowed on the scalar are C<substr>/C<vec> that don't |
1939 | The only operations allowed on the scalar are C<substr>/C<vec> that don't |
1703 | change the string length, and most read-only operations such as copying it |
1940 | change the string length, and most read-only operations such as copying it |
1704 | or searching it with regexes and so on. |
1941 | or searching it with regexes and so on. |
1705 | |
1942 | |
… | |
… | |
1758 | Calls the C<munlockall> function. |
1995 | Calls the C<munlockall> function. |
1759 | |
1996 | |
1760 | On systems that do not implement C<munlockall>, this function returns |
1997 | On systems that do not implement C<munlockall>, this function returns |
1761 | ENOSYS, otherwise the return value of C<munlockall>. |
1998 | ENOSYS, otherwise the return value of C<munlockall>. |
1762 | |
1999 | |
|
|
2000 | =item IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
|
|
2001 | |
|
|
2002 | Calls the GNU/Linux C<splice(2)> syscall, if available. If C<$r_off> or |
|
|
2003 | C<$w_off> are C<undef>, then C<NULL> is passed for these, otherwise they |
|
|
2004 | should be the file offset. |
|
|
2005 | |
|
|
2006 | C<$r_fh> and C<$w_fh> should not refer to the same file, as splice might |
|
|
2007 | silently corrupt the data in this case. |
|
|
2008 | |
|
|
2009 | The following symbol flag values are available: C<IO::AIO::SPLICE_F_MOVE>, |
|
|
2010 | C<IO::AIO::SPLICE_F_NONBLOCK>, C<IO::AIO::SPLICE_F_MORE> and |
|
|
2011 | C<IO::AIO::SPLICE_F_GIFT>. |
|
|
2012 | |
|
|
2013 | See the C<splice(2)> manpage for details. |
|
|
2014 | |
|
|
2015 | =item IO::AIO::tee $r_fh, $w_fh, $length, $flags |
|
|
2016 | |
|
|
2017 | Calls the GNU/Linux C<tee(2)> syscall, see it's manpage and the |
|
|
2018 | description for C<IO::AIO::splice> above for details. |
|
|
2019 | |
1763 | =back |
2020 | =back |
1764 | |
2021 | |
1765 | =cut |
2022 | =cut |
1766 | |
2023 | |
1767 | min_parallel 8; |
2024 | min_parallel 8; |
… | |
… | |
1821 | |
2078 | |
1822 | =over 4 |
2079 | =over 4 |
1823 | |
2080 | |
1824 | =item IO::AIO::reinit |
2081 | =item IO::AIO::reinit |
1825 | |
2082 | |
1826 | Abondons all current requests and I/O threads and simply reinitialises all |
2083 | Abandons all current requests and I/O threads and simply reinitialises all |
1827 | data structures. This is not an operation suppported by any standards, but |
2084 | data structures. This is not an operation supported by any standards, but |
1828 | happens to work on GNU/Linux and some newer BSD systems. |
2085 | happens to work on GNU/Linux and some newer BSD systems. |
1829 | |
2086 | |
1830 | The only reasonable use for this function is to call it after forking, if |
2087 | The only reasonable use for this function is to call it after forking, if |
1831 | C<IO::AIO> was used in the parent. Calling it while IO::AIO is active in |
2088 | C<IO::AIO> was used in the parent. Calling it while IO::AIO is active in |
1832 | the process will result in undefined behaviour. Calling it at any time |
2089 | the process will result in undefined behaviour. Calling it at any time |