1 | =head1 NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | IO::AIO - Asynchronous Input/Output |
3 | IO::AIO - Asynchronous/Advanced Input/Output |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use IO::AIO; |
7 | use IO::AIO; |
8 | |
8 | |
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58 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
58 | not well-supported or restricted (GNU/Linux doesn't allow them on normal |
59 | files currently, for example), and they would only support aio_read and |
59 | files currently, for example), and they would only support aio_read and |
60 | aio_write, so the remaining functionality would have to be implemented |
60 | aio_write, so the remaining functionality would have to be implemented |
61 | using threads anyway. |
61 | using threads anyway. |
62 | |
62 | |
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63 | In addition to asynchronous I/O, this module also exports some rather |
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64 | arcane interfaces, such as C<madvise> or linux's C<splice> system call, |
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65 | which is why the C<A> in C<AIO> can also mean I<advanced>. |
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66 | |
63 | Although the module will work in the presence of other (Perl-) threads, |
67 | Although the module will work in the presence of other (Perl-) threads, |
64 | it is currently not reentrant in any way, so use appropriate locking |
68 | it is currently not reentrant in any way, so use appropriate locking |
65 | yourself, always call C<poll_cb> from within the same thread, or never |
69 | yourself, always call C<poll_cb> from within the same thread, or never |
66 | call C<poll_cb> (or other C<aio_> functions) recursively. |
70 | call C<poll_cb> (or other C<aio_> functions) recursively. |
67 | |
71 | |
68 | =head2 EXAMPLE |
72 | =head2 EXAMPLE |
69 | |
73 | |
70 | This is a simple example that uses the EV module and loads |
74 | This is a simple example that uses the EV module and loads |
71 | F</etc/passwd> asynchronously: |
75 | F</etc/passwd> asynchronously: |
72 | |
76 | |
73 | use Fcntl; |
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74 | use EV; |
77 | use EV; |
75 | use IO::AIO; |
78 | use IO::AIO; |
76 | |
79 | |
77 | # register the IO::AIO callback with EV |
80 | # register the IO::AIO callback with EV |
78 | my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
81 | my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
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95 | |
98 | |
96 | # file contents now in $contents |
99 | # file contents now in $contents |
97 | print $contents; |
100 | print $contents; |
98 | |
101 | |
99 | # exit event loop and program |
102 | # exit event loop and program |
100 | EV::unloop; |
103 | EV::break; |
101 | }; |
104 | }; |
102 | }; |
105 | }; |
103 | |
106 | |
104 | # possibly queue up other requests, or open GUI windows, |
107 | # possibly queue up other requests, or open GUI windows, |
105 | # check for sockets etc. etc. |
108 | # check for sockets etc. etc. |
106 | |
109 | |
107 | # process events as long as there are some: |
110 | # process events as long as there are some: |
108 | EV::loop; |
111 | EV::run; |
109 | |
112 | |
110 | =head1 REQUEST ANATOMY AND LIFETIME |
113 | =head1 REQUEST ANATOMY AND LIFETIME |
111 | |
114 | |
112 | Every C<aio_*> function creates a request. which is a C data structure not |
115 | Every C<aio_*> function creates a request. which is a C data structure not |
113 | directly visible to Perl. |
116 | directly visible to Perl. |
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168 | use common::sense; |
171 | use common::sense; |
169 | |
172 | |
170 | use base 'Exporter'; |
173 | use base 'Exporter'; |
171 | |
174 | |
172 | BEGIN { |
175 | BEGIN { |
173 | our $VERSION = '4.0'; |
176 | our $VERSION = 4.35; |
174 | |
177 | |
175 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close |
178 | 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 |
179 | aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir aio_readdirx |
177 | aio_scandir aio_symlink aio_readlink aio_realpath aio_sync |
180 | aio_scandir aio_symlink aio_readlink aio_realpath aio_fcntl aio_ioctl |
178 | aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range aio_fallocate |
181 | aio_sync aio_fsync aio_syncfs aio_fdatasync aio_sync_file_range |
179 | aio_pathsync aio_readahead |
182 | aio_pathsync aio_readahead aio_fiemap aio_allocate |
180 | aio_rename aio_link aio_move aio_copy aio_group |
183 | aio_rename aio_rename2 aio_link aio_move aio_copy aio_group |
181 | aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown |
184 | aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown |
182 | aio_chmod aio_utime aio_truncate |
185 | aio_chmod aio_utime aio_truncate |
183 | aio_msync aio_mtouch aio_mlock aio_mlockall |
186 | aio_msync aio_mtouch aio_mlock aio_mlockall |
184 | aio_statvfs |
187 | aio_statvfs |
185 | aio_wd); |
188 | aio_wd); |
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202 | |
205 | |
203 | =head1 FUNCTIONS |
206 | =head1 FUNCTIONS |
204 | |
207 | |
205 | =head2 QUICK OVERVIEW |
208 | =head2 QUICK OVERVIEW |
206 | |
209 | |
207 | This section simply lists the prototypes of the most important functions |
210 | This section simply lists the prototypes most of the functions for |
208 | for quick reference. See the following sections for function-by-function |
211 | quick reference. See the following sections for function-by-function |
209 | documentation. |
212 | documentation. |
210 | |
213 | |
211 | aio_wd $pathname, $callback->($wd) |
214 | aio_wd $pathname, $callback->($wd) |
212 | aio_open $pathname, $flags, $mode, $callback->($fh) |
215 | aio_open $pathname, $flags, $mode, $callback->($fh) |
213 | aio_close $fh, $callback->($status) |
216 | aio_close $fh, $callback->($status) |
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217 | aio_seek $fh,$offset,$whence, $callback->($offs) |
214 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
218 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
215 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
219 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
216 | aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
220 | aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
217 | aio_readahead $fh,$offset,$length, $callback->($retval) |
221 | aio_readahead $fh,$offset,$length, $callback->($retval) |
218 | aio_stat $fh_or_path, $callback->($status) |
222 | aio_stat $fh_or_path, $callback->($status) |
219 | aio_lstat $fh, $callback->($status) |
223 | aio_lstat $fh, $callback->($status) |
220 | aio_statvfs $fh_or_path, $callback->($statvfs) |
224 | aio_statvfs $fh_or_path, $callback->($statvfs) |
221 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
225 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
222 | aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
226 | aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
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227 | aio_chmod $fh_or_path, $mode, $callback->($status) |
223 | aio_truncate $fh_or_path, $offset, $callback->($status) |
228 | aio_truncate $fh_or_path, $offset, $callback->($status) |
224 | aio_chmod $fh_or_path, $mode, $callback->($status) |
229 | aio_allocate $fh, $mode, $offset, $len, $callback->($status) |
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230 | aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
225 | aio_unlink $pathname, $callback->($status) |
231 | aio_unlink $pathname, $callback->($status) |
226 | aio_mknod $pathname, $mode, $dev, $callback->($status) |
232 | aio_mknod $pathname, $mode, $dev, $callback->($status) |
227 | aio_link $srcpath, $dstpath, $callback->($status) |
233 | aio_link $srcpath, $dstpath, $callback->($status) |
228 | aio_symlink $srcpath, $dstpath, $callback->($status) |
234 | aio_symlink $srcpath, $dstpath, $callback->($status) |
229 | aio_readlink $pathname, $callback->($link) |
235 | aio_readlink $pathname, $callback->($link) |
230 | aio_realpath $pathname, $callback->($link) |
236 | aio_realpath $pathname, $callback->($path) |
231 | aio_rename $srcpath, $dstpath, $callback->($status) |
237 | aio_rename $srcpath, $dstpath, $callback->($status) |
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238 | aio_rename2 $srcpath, $dstpath, $flags, $callback->($status) |
232 | aio_mkdir $pathname, $mode, $callback->($status) |
239 | aio_mkdir $pathname, $mode, $callback->($status) |
233 | aio_rmdir $pathname, $callback->($status) |
240 | aio_rmdir $pathname, $callback->($status) |
234 | aio_readdir $pathname, $callback->($entries) |
241 | aio_readdir $pathname, $callback->($entries) |
235 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
242 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
236 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
243 | IO::AIO::READDIR_DENTS IO::AIO::READDIR_DIRS_FIRST |
237 | IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN |
244 | IO::AIO::READDIR_STAT_ORDER IO::AIO::READDIR_FOUND_UNKNOWN |
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245 | aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs) |
238 | aio_load $pathname, $data, $callback->($status) |
246 | aio_load $pathname, $data, $callback->($status) |
239 | aio_copy $srcpath, $dstpath, $callback->($status) |
247 | aio_copy $srcpath, $dstpath, $callback->($status) |
240 | aio_move $srcpath, $dstpath, $callback->($status) |
248 | aio_move $srcpath, $dstpath, $callback->($status) |
241 | aio_scandir $pathname, $maxreq, $callback->($dirs, $nondirs) |
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242 | aio_rmtree $pathname, $callback->($status) |
249 | aio_rmtree $pathname, $callback->($status) |
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250 | aio_fcntl $fh, $cmd, $arg, $callback->($status) |
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251 | aio_ioctl $fh, $request, $buf, $callback->($status) |
243 | aio_sync $callback->($status) |
252 | aio_sync $callback->($status) |
244 | aio_syncfs $fh, $callback->($status) |
253 | aio_syncfs $fh, $callback->($status) |
245 | aio_fsync $fh, $callback->($status) |
254 | aio_fsync $fh, $callback->($status) |
246 | aio_fdatasync $fh, $callback->($status) |
255 | aio_fdatasync $fh, $callback->($status) |
247 | aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
256 | aio_sync_file_range $fh, $offset, $nbytes, $flags, $callback->($status) |
248 | aio_pathsync $pathname, $callback->($status) |
257 | aio_pathsync $pathname, $callback->($status) |
249 | aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
258 | aio_msync $scalar, $offset = 0, $length = undef, flags = MS_SYNC, $callback->($status) |
250 | aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
259 | aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
251 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
260 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
252 | aio_mlockall $flags, $callback->($status) |
261 | aio_mlockall $flags, $callback->($status) |
253 | aio_group $callback->(...) |
262 | aio_group $callback->(...) |
254 | aio_nop $callback->() |
263 | aio_nop $callback->() |
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268 | IO::AIO::idle_timeout $seconds |
277 | IO::AIO::idle_timeout $seconds |
269 | IO::AIO::max_outstanding $maxreqs |
278 | IO::AIO::max_outstanding $maxreqs |
270 | IO::AIO::nreqs |
279 | IO::AIO::nreqs |
271 | IO::AIO::nready |
280 | IO::AIO::nready |
272 | IO::AIO::npending |
281 | IO::AIO::npending |
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282 | IO::AIO::min_fdlimit $nfd; |
273 | |
283 | |
274 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
284 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
275 | IO::AIO::fadvise $fh, $offset, $len, $advice |
285 | IO::AIO::fadvise $fh, $offset, $len, $advice |
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286 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
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287 | IO::AIO::munmap $scalar |
276 | IO::AIO::madvise $scalar, $offset, $length, $advice |
288 | IO::AIO::madvise $scalar, $offset, $length, $advice |
277 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
289 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
278 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
290 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
279 | IO::AIO::munlockall |
291 | IO::AIO::munlockall |
280 | |
292 | |
281 | =head2 AIO REQUEST FUNCTIONS |
293 | =head2 API NOTES |
282 | |
294 | |
283 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
295 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
284 | with the same name (sans C<aio_>). The arguments are similar or identical, |
296 | with the same name (sans C<aio_>). The arguments are similar or identical, |
285 | and they all accept an additional (and optional) C<$callback> argument |
297 | and they all accept an additional (and optional) C<$callback> argument |
286 | which must be a code reference. This code reference will get called with |
298 | which must be a code reference. This code reference will be called after |
287 | the syscall return code (e.g. most syscalls return C<-1> on error, unlike |
299 | the syscall has been executed in an asynchronous fashion. The results |
288 | perl, which usually delivers "false") as its sole argument after the given |
300 | of the request will be passed as arguments to the callback (and, if an |
289 | syscall has been executed asynchronously. |
301 | error occured, in C<$!>) - for most requests the syscall return code (e.g. |
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302 | most syscalls return C<-1> on error, unlike perl, which usually delivers |
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303 | "false"). |
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304 | |
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305 | Some requests (such as C<aio_readdir>) pass the actual results and |
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306 | communicate failures by passing C<undef>. |
290 | |
307 | |
291 | All functions expecting a filehandle keep a copy of the filehandle |
308 | All functions expecting a filehandle keep a copy of the filehandle |
292 | internally until the request has finished. |
309 | internally until the request has finished. |
293 | |
310 | |
294 | All functions return request objects of type L<IO::AIO::REQ> that allow |
311 | All functions return request objects of type L<IO::AIO::REQ> that allow |
295 | further manipulation of those requests while they are in-flight. |
312 | further manipulation of those requests while they are in-flight. |
296 | |
313 | |
297 | The pathnames you pass to these routines I<should> be absolute. The |
314 | The pathnames you pass to these routines I<should> be absolute. The |
298 | reason for this is that at the time the request is being executed, the |
315 | reason for this is that at the time the request is being executed, the |
299 | current working directory could have changed. Alternatively, you can make |
316 | current working directory could have changed. Alternatively, you can |
300 | sure that you never change the current working directory anywhere in |
317 | make sure that you never change the current working directory anywhere |
301 | the program and then use relative paths. Lastly, you can take advantage |
318 | in the program and then use relative paths. You can also take advantage |
302 | of IO::AIOs working directory abstraction - see the description of the |
319 | of IO::AIOs working directory abstraction, that lets you specify paths |
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320 | relative to some previously-opened "working directory object" - see the |
303 | C<IO::AIO::WD> class later in this document. |
321 | description of the C<IO::AIO::WD> class later in this document. |
304 | |
322 | |
305 | To encode pathnames as octets, either make sure you either: a) always pass |
323 | To encode pathnames as octets, either make sure you either: a) always pass |
306 | in filenames you got from outside (command line, readdir etc.) without |
324 | in filenames you got from outside (command line, readdir etc.) without |
307 | tinkering, b) are ASCII or ISO 8859-1, c) use the Encode module and encode |
325 | tinkering, b) are in your native filesystem encoding, c) use the Encode |
308 | your pathnames to the locale (or other) encoding in effect in the user |
326 | module and encode your pathnames to the locale (or other) encoding in |
309 | environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
327 | effect in the user environment, d) use Glib::filename_from_unicode on |
310 | use something else to ensure your scalar has the correct contents. |
328 | unicode filenames or e) use something else to ensure your scalar has the |
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329 | correct contents. |
311 | |
330 | |
312 | This works, btw. independent of the internal UTF-8 bit, which IO::AIO |
331 | This works, btw. independent of the internal UTF-8 bit, which IO::AIO |
313 | handles correctly whether it is set or not. |
332 | handles correctly whether it is set or not. |
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333 | |
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334 | =head2 AIO REQUEST FUNCTIONS |
314 | |
335 | |
315 | =over 4 |
336 | =over 4 |
316 | |
337 | |
317 | =item $prev_pri = aioreq_pri [$pri] |
338 | =item $prev_pri = aioreq_pri [$pri] |
318 | |
339 | |
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348 | |
369 | |
349 | |
370 | |
350 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
371 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
351 | |
372 | |
352 | Asynchronously open or create a file and call the callback with a newly |
373 | Asynchronously open or create a file and call the callback with a newly |
353 | created filehandle for the file. |
374 | created filehandle for the file (or C<undef> in case of an error). |
354 | |
375 | |
355 | The pathname passed to C<aio_open> must be absolute. See API NOTES, above, |
376 | The pathname passed to C<aio_open> must be absolute. See API NOTES, above, |
356 | for an explanation. |
377 | for an explanation. |
357 | |
378 | |
358 | The C<$flags> argument is a bitmask. See the C<Fcntl> module for a |
379 | The C<$flags> argument is a bitmask. See the C<Fcntl> module for a |
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381 | following POSIX and non-POSIX constants are available (missing ones on |
402 | following POSIX and non-POSIX constants are available (missing ones on |
382 | your system are, as usual, C<0>): |
403 | your system are, as usual, C<0>): |
383 | |
404 | |
384 | C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>, |
405 | C<O_ASYNC>, C<O_DIRECT>, C<O_NOATIME>, C<O_CLOEXEC>, C<O_NOCTTY>, C<O_NOFOLLOW>, |
385 | C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>, |
406 | C<O_NONBLOCK>, C<O_EXEC>, C<O_SEARCH>, C<O_DIRECTORY>, C<O_DSYNC>, |
386 | C<O_RSYNC>, C<O_SYNC> and C<O_TTY_INIT>. |
407 | C<O_RSYNC>, C<O_SYNC>, C<O_PATH>, C<O_TMPFILE>, and C<O_TTY_INIT>. |
387 | |
408 | |
388 | |
409 | |
389 | =item aio_close $fh, $callback->($status) |
410 | =item aio_close $fh, $callback->($status) |
390 | |
411 | |
391 | Asynchronously close a file and call the callback with the result |
412 | Asynchronously close a file and call the callback with the result |
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401 | Or in other words: the file descriptor will be closed, but it will not be |
422 | Or in other words: the file descriptor will be closed, but it will not be |
402 | free for reuse until the perl filehandle is closed. |
423 | free for reuse until the perl filehandle is closed. |
403 | |
424 | |
404 | =cut |
425 | =cut |
405 | |
426 | |
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427 | =item aio_seek $fh, $offset, $whence, $callback->($offs) |
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428 | |
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429 | Seeks the filehandle to the new C<$offset>, similarly to perl's |
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430 | C<sysseek>. The C<$whence> can use the traditional values (C<0> for |
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431 | C<IO::AIO::SEEK_SET>, C<1> for C<IO::AIO::SEEK_CUR> or C<2> for |
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432 | C<IO::AIO::SEEK_END>). |
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433 | |
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434 | The resulting absolute offset will be passed to the callback, or C<-1> in |
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435 | case of an error. |
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436 | |
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437 | In theory, the C<$whence> constants could be different than the |
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438 | corresponding values from L<Fcntl>, but perl guarantees they are the same, |
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439 | so don't panic. |
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440 | |
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441 | As a GNU/Linux (and maybe Solaris) extension, also the constants |
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442 | C<IO::AIO::SEEK_DATA> and C<IO::AIO::SEEK_HOLE> are available, if they |
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443 | could be found. No guarantees about suitability for use in C<aio_seek> or |
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444 | Perl's C<sysseek> can be made though, although I would naively assume they |
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445 | "just work". |
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446 | |
406 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
447 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
407 | |
448 | |
408 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
449 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
409 | |
450 | |
410 | Reads or writes C<$length> bytes from or to the specified C<$fh> and |
451 | Reads or writes C<$length> bytes from or to the specified C<$fh> and |
411 | C<$offset> into the scalar given by C<$data> and offset C<$dataoffset> |
452 | C<$offset> into the scalar given by C<$data> and offset C<$dataoffset> and |
412 | and calls the callback without the actual number of bytes read (or -1 on |
453 | calls the callback with the actual number of bytes transferred (or -1 on |
413 | error, just like the syscall). |
454 | error, just like the syscall). |
414 | |
455 | |
415 | C<aio_read> will, like C<sysread>, shrink or grow the C<$data> scalar to |
456 | C<aio_read> will, like C<sysread>, shrink or grow the C<$data> scalar to |
416 | offset plus the actual number of bytes read. |
457 | offset plus the actual number of bytes read. |
417 | |
458 | |
… | |
… | |
475 | As native sendfile syscalls (as practically any non-POSIX interface hacked |
516 | As native sendfile syscalls (as practically any non-POSIX interface hacked |
476 | together in a hurry to improve benchmark numbers) tend to be rather buggy |
517 | together in a hurry to improve benchmark numbers) tend to be rather buggy |
477 | on many systems, this implementation tries to work around some known bugs |
518 | on many systems, this implementation tries to work around some known bugs |
478 | in Linux and FreeBSD kernels (probably others, too), but that might fail, |
519 | in Linux and FreeBSD kernels (probably others, too), but that might fail, |
479 | so you really really should check the return value of C<aio_sendfile> - |
520 | so you really really should check the return value of C<aio_sendfile> - |
480 | fewre bytes than expected might have been transferred. |
521 | fewer bytes than expected might have been transferred. |
481 | |
522 | |
482 | |
523 | |
483 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
524 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
484 | |
525 | |
485 | C<aio_readahead> populates the page cache with data from a file so that |
526 | C<aio_readahead> populates the page cache with data from a file so that |
… | |
… | |
489 | whole pages, so that offset is effectively rounded down to a page boundary |
530 | whole pages, so that offset is effectively rounded down to a page boundary |
490 | and bytes are read up to the next page boundary greater than or equal to |
531 | and bytes are read up to the next page boundary greater than or equal to |
491 | (off-set+length). C<aio_readahead> does not read beyond the end of the |
532 | (off-set+length). C<aio_readahead> does not read beyond the end of the |
492 | file. The current file offset of the file is left unchanged. |
533 | file. The current file offset of the file is left unchanged. |
493 | |
534 | |
494 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
535 | If that syscall doesn't exist (likely if your kernel isn't Linux) it will |
495 | emulated by simply reading the data, which would have a similar effect. |
536 | be emulated by simply reading the data, which would have a similar effect. |
496 | |
537 | |
497 | |
538 | |
498 | =item aio_stat $fh_or_path, $callback->($status) |
539 | =item aio_stat $fh_or_path, $callback->($status) |
499 | |
540 | |
500 | =item aio_lstat $fh, $callback->($status) |
541 | =item aio_lstat $fh, $callback->($status) |
… | |
… | |
569 | namemax => 255, |
610 | namemax => 255, |
570 | frsize => 1024, |
611 | frsize => 1024, |
571 | fsid => 1810 |
612 | fsid => 1810 |
572 | } |
613 | } |
573 | |
614 | |
|
|
615 | Here is a (likely partial - send me updates!) list of fsid values used by |
|
|
616 | Linux - it is safe to hardcode these when C<$^O> is C<linux>: |
|
|
617 | |
|
|
618 | 0x0000adf5 adfs |
|
|
619 | 0x0000adff affs |
|
|
620 | 0x5346414f afs |
|
|
621 | 0x09041934 anon-inode filesystem |
|
|
622 | 0x00000187 autofs |
|
|
623 | 0x42465331 befs |
|
|
624 | 0x1badface bfs |
|
|
625 | 0x42494e4d binfmt_misc |
|
|
626 | 0x9123683e btrfs |
|
|
627 | 0x0027e0eb cgroupfs |
|
|
628 | 0xff534d42 cifs |
|
|
629 | 0x73757245 coda |
|
|
630 | 0x012ff7b7 coh |
|
|
631 | 0x28cd3d45 cramfs |
|
|
632 | 0x453dcd28 cramfs-wend (wrong endianness) |
|
|
633 | 0x64626720 debugfs |
|
|
634 | 0x00001373 devfs |
|
|
635 | 0x00001cd1 devpts |
|
|
636 | 0x0000f15f ecryptfs |
|
|
637 | 0x00414a53 efs |
|
|
638 | 0x0000137d ext |
|
|
639 | 0x0000ef53 ext2/ext3/ext4 |
|
|
640 | 0x0000ef51 ext2 |
|
|
641 | 0xf2f52010 f2fs |
|
|
642 | 0x00004006 fat |
|
|
643 | 0x65735546 fuseblk |
|
|
644 | 0x65735543 fusectl |
|
|
645 | 0x0bad1dea futexfs |
|
|
646 | 0x01161970 gfs2 |
|
|
647 | 0x47504653 gpfs |
|
|
648 | 0x00004244 hfs |
|
|
649 | 0xf995e849 hpfs |
|
|
650 | 0x00c0ffee hostfs |
|
|
651 | 0x958458f6 hugetlbfs |
|
|
652 | 0x2bad1dea inotifyfs |
|
|
653 | 0x00009660 isofs |
|
|
654 | 0x000072b6 jffs2 |
|
|
655 | 0x3153464a jfs |
|
|
656 | 0x6b414653 k-afs |
|
|
657 | 0x0bd00bd0 lustre |
|
|
658 | 0x0000137f minix |
|
|
659 | 0x0000138f minix 30 char names |
|
|
660 | 0x00002468 minix v2 |
|
|
661 | 0x00002478 minix v2 30 char names |
|
|
662 | 0x00004d5a minix v3 |
|
|
663 | 0x19800202 mqueue |
|
|
664 | 0x00004d44 msdos |
|
|
665 | 0x0000564c novell |
|
|
666 | 0x00006969 nfs |
|
|
667 | 0x6e667364 nfsd |
|
|
668 | 0x00003434 nilfs |
|
|
669 | 0x5346544e ntfs |
|
|
670 | 0x00009fa1 openprom |
|
|
671 | 0x7461636F ocfs2 |
|
|
672 | 0x00009fa0 proc |
|
|
673 | 0x6165676c pstorefs |
|
|
674 | 0x0000002f qnx4 |
|
|
675 | 0x68191122 qnx6 |
|
|
676 | 0x858458f6 ramfs |
|
|
677 | 0x52654973 reiserfs |
|
|
678 | 0x00007275 romfs |
|
|
679 | 0x67596969 rpc_pipefs |
|
|
680 | 0x73636673 securityfs |
|
|
681 | 0xf97cff8c selinux |
|
|
682 | 0x0000517b smb |
|
|
683 | 0x534f434b sockfs |
|
|
684 | 0x73717368 squashfs |
|
|
685 | 0x62656572 sysfs |
|
|
686 | 0x012ff7b6 sysv2 |
|
|
687 | 0x012ff7b5 sysv4 |
|
|
688 | 0x01021994 tmpfs |
|
|
689 | 0x15013346 udf |
|
|
690 | 0x00011954 ufs |
|
|
691 | 0x54190100 ufs byteswapped |
|
|
692 | 0x00009fa2 usbdevfs |
|
|
693 | 0x01021997 v9fs |
|
|
694 | 0xa501fcf5 vxfs |
|
|
695 | 0xabba1974 xenfs |
|
|
696 | 0x012ff7b4 xenix |
|
|
697 | 0x58465342 xfs |
|
|
698 | 0x012fd16d xia |
574 | |
699 | |
575 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
700 | =item aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
576 | |
701 | |
577 | Works like perl's C<utime> function (including the special case of $atime |
702 | Works like perl's C<utime> function (including the special case of $atime |
578 | and $mtime being undef). Fractional times are supported if the underlying |
703 | and $mtime being undef). Fractional times are supported if the underlying |
… | |
… | |
606 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
731 | =item aio_truncate $fh_or_path, $offset, $callback->($status) |
607 | |
732 | |
608 | Works like truncate(2) or ftruncate(2). |
733 | Works like truncate(2) or ftruncate(2). |
609 | |
734 | |
610 | |
735 | |
|
|
736 | =item aio_allocate $fh, $mode, $offset, $len, $callback->($status) |
|
|
737 | |
|
|
738 | Allocates or frees disk space according to the C<$mode> argument. See the |
|
|
739 | linux C<fallocate> documentation for details. |
|
|
740 | |
|
|
741 | C<$mode> is usually C<0> or C<IO::AIO::FALLOC_FL_KEEP_SIZE> to allocate |
|
|
742 | space, or C<IO::AIO::FALLOC_FL_PUNCH_HOLE | IO::AIO::FALLOC_FL_KEEP_SIZE>, |
|
|
743 | to deallocate a file range. |
|
|
744 | |
|
|
745 | IO::AIO also supports C<FALLOC_FL_COLLAPSE_RANGE>, to remove a range |
|
|
746 | (without leaving a hole), C<FALLOC_FL_ZERO_RANGE>, to zero a range, |
|
|
747 | C<FALLOC_FL_INSERT_RANGE> to insert a range and C<FALLOC_FL_UNSHARE_RANGE> |
|
|
748 | to unshare shared blocks (see your L<fallocate(2)> manpage). |
|
|
749 | |
|
|
750 | The file system block size used by C<fallocate> is presumably the |
|
|
751 | C<f_bsize> returned by C<statvfs>, but different filesystems and filetypes |
|
|
752 | can dictate other limitations. |
|
|
753 | |
|
|
754 | If C<fallocate> isn't available or cannot be emulated (currently no |
|
|
755 | emulation will be attempted), passes C<-1> and sets C<$!> to C<ENOSYS>. |
|
|
756 | |
|
|
757 | |
611 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
758 | =item aio_chmod $fh_or_path, $mode, $callback->($status) |
612 | |
759 | |
613 | Works like perl's C<chmod> function. |
760 | Works like perl's C<chmod> function. |
614 | |
761 | |
615 | |
762 | |
… | |
… | |
652 | |
799 | |
653 | |
800 | |
654 | =item aio_realpath $pathname, $callback->($path) |
801 | =item aio_realpath $pathname, $callback->($path) |
655 | |
802 | |
656 | Asynchronously make the path absolute and resolve any symlinks in |
803 | Asynchronously make the path absolute and resolve any symlinks in |
657 | C<$path>. The resulting path only consists of directories (Same as |
804 | C<$path>. The resulting path only consists of directories (same as |
658 | L<Cwd::realpath>). |
805 | L<Cwd::realpath>). |
659 | |
806 | |
660 | This request can be used to get the absolute path of the current working |
807 | This request can be used to get the absolute path of the current working |
661 | directory by passing it a path of F<.> (a single dot). |
808 | directory by passing it a path of F<.> (a single dot). |
662 | |
809 | |
663 | |
810 | |
664 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
811 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
665 | |
812 | |
666 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
813 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
667 | rename(2) and call the callback with the result code. |
814 | rename(2) and call the callback with the result code. |
|
|
815 | |
|
|
816 | On systems that support the AIO::WD working directory abstraction |
|
|
817 | natively, the case C<[$wd, "."]> as C<$srcpath> is specialcased - instead |
|
|
818 | of failing, C<rename> is called on the absolute path of C<$wd>. |
|
|
819 | |
|
|
820 | |
|
|
821 | =item aio_rename2 $srcpath, $dstpath, $flags, $callback->($status) |
|
|
822 | |
|
|
823 | Basically a version of C<aio_rename> with an additional C<$flags> |
|
|
824 | argument. Calling this with C<$flags=0> is the same as calling |
|
|
825 | C<aio_rename>. |
|
|
826 | |
|
|
827 | Non-zero flags are currently only supported on GNU/Linux systems that |
|
|
828 | support renameat2. Other systems fail with C<ENOSYS> in this case. |
|
|
829 | |
|
|
830 | The following constants are available (missing ones are, as usual C<0>), |
|
|
831 | see renameat2(2) for details: |
|
|
832 | |
|
|
833 | C<IO::AIO::RENAME_NOREPLACE>, C<IO::AIO::RENAME_EXCHANGE> |
|
|
834 | and C<IO::AIO::RENAME_WHITEOUT>. |
668 | |
835 | |
669 | |
836 | |
670 | =item aio_mkdir $pathname, $mode, $callback->($status) |
837 | =item aio_mkdir $pathname, $mode, $callback->($status) |
671 | |
838 | |
672 | Asynchronously mkdir (create) a directory and call the callback with |
839 | Asynchronously mkdir (create) a directory and call the callback with |
… | |
… | |
676 | |
843 | |
677 | =item aio_rmdir $pathname, $callback->($status) |
844 | =item aio_rmdir $pathname, $callback->($status) |
678 | |
845 | |
679 | Asynchronously rmdir (delete) a directory and call the callback with the |
846 | Asynchronously rmdir (delete) a directory and call the callback with the |
680 | result code. |
847 | result code. |
|
|
848 | |
|
|
849 | On systems that support the AIO::WD working directory abstraction |
|
|
850 | natively, the case C<[$wd, "."]> is specialcased - instead of failing, |
|
|
851 | C<rmdir> is called on the absolute path of C<$wd>. |
681 | |
852 | |
682 | |
853 | |
683 | =item aio_readdir $pathname, $callback->($entries) |
854 | =item aio_readdir $pathname, $callback->($entries) |
684 | |
855 | |
685 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
856 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
… | |
… | |
787 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
958 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
788 | |
959 | |
789 | Try to copy the I<file> (directories not supported as either source or |
960 | Try to copy the I<file> (directories not supported as either source or |
790 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
961 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
791 | a status of C<0> (ok) or C<-1> (error, see C<$!>). |
962 | a status of C<0> (ok) or C<-1> (error, see C<$!>). |
|
|
963 | |
|
|
964 | Existing destination files will be truncated. |
792 | |
965 | |
793 | This is a composite request that creates the destination file with |
966 | This is a composite request that creates the destination file with |
794 | mode 0200 and copies the contents of the source file into it using |
967 | mode 0200 and copies the contents of the source file into it using |
795 | C<aio_sendfile>, followed by restoring atime, mtime, access mode and |
968 | C<aio_sendfile>, followed by restoring atime, mtime, access mode and |
796 | uid/gid, in that order. |
969 | uid/gid, in that order. |
… | |
… | |
906 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
1079 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
907 | efficiently separate the entries of directory C<$path> into two sets of |
1080 | efficiently separate the entries of directory C<$path> into two sets of |
908 | names, directories you can recurse into (directories), and ones you cannot |
1081 | names, directories you can recurse into (directories), and ones you cannot |
909 | recurse into (everything else, including symlinks to directories). |
1082 | recurse into (everything else, including symlinks to directories). |
910 | |
1083 | |
911 | C<aio_scandir> is a composite request that creates of many sub requests_ |
1084 | C<aio_scandir> is a composite request that generates many sub requests. |
912 | C<$maxreq> specifies the maximum number of outstanding aio requests that |
1085 | C<$maxreq> specifies the maximum number of outstanding aio requests that |
913 | this function generates. If it is C<< <= 0 >>, then a suitable default |
1086 | this function generates. If it is C<< <= 0 >>, then a suitable default |
914 | will be chosen (currently 4). |
1087 | will be chosen (currently 4). |
915 | |
1088 | |
916 | On error, the callback is called without arguments, otherwise it receives |
1089 | On error, the callback is called without arguments, otherwise it receives |
… | |
… | |
966 | |
1139 | |
967 | my $grp = aio_group $cb; |
1140 | my $grp = aio_group $cb; |
968 | |
1141 | |
969 | $maxreq = 4 if $maxreq <= 0; |
1142 | $maxreq = 4 if $maxreq <= 0; |
970 | |
1143 | |
971 | # stat once |
1144 | # get a wd object |
972 | aioreq_pri $pri; |
1145 | aioreq_pri $pri; |
973 | add $grp aio_stat $path, sub { |
1146 | add $grp aio_wd $path, sub { |
|
|
1147 | $_[0] |
974 | return $grp->result () if $_[0]; |
1148 | or return $grp->result (); |
975 | my $now = time; |
|
|
976 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
977 | |
1149 | |
978 | # read the directory entries |
1150 | my $wd = [shift, "."]; |
|
|
1151 | |
|
|
1152 | # stat once |
979 | aioreq_pri $pri; |
1153 | aioreq_pri $pri; |
980 | add $grp aio_readdirx $path, READDIR_DIRS_FIRST, sub { |
1154 | add $grp aio_stat $wd, sub { |
981 | my $entries = shift |
|
|
982 | or return $grp->result (); |
1155 | return $grp->result () if $_[0]; |
|
|
1156 | my $now = time; |
|
|
1157 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
983 | |
1158 | |
984 | # stat the dir another time |
1159 | # read the directory entries |
985 | aioreq_pri $pri; |
1160 | aioreq_pri $pri; |
|
|
1161 | add $grp aio_readdirx $wd, READDIR_DIRS_FIRST, sub { |
|
|
1162 | my $entries = shift |
|
|
1163 | or return $grp->result (); |
|
|
1164 | |
|
|
1165 | # stat the dir another time |
|
|
1166 | aioreq_pri $pri; |
986 | add $grp aio_stat $path, sub { |
1167 | add $grp aio_stat $wd, sub { |
987 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
1168 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
988 | |
1169 | |
989 | my $ndirs; |
1170 | my $ndirs; |
990 | |
1171 | |
991 | # take the slow route if anything looks fishy |
1172 | # take the slow route if anything looks fishy |
992 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
1173 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
993 | $ndirs = -1; |
1174 | $ndirs = -1; |
994 | } else { |
1175 | } else { |
995 | # if nlink == 2, we are finished |
1176 | # if nlink == 2, we are finished |
996 | # for non-posix-fs's, we rely on nlink < 2 |
1177 | # for non-posix-fs's, we rely on nlink < 2 |
997 | $ndirs = (stat _)[3] - 2 |
1178 | $ndirs = (stat _)[3] - 2 |
998 | or return $grp->result ([], $entries); |
1179 | or return $grp->result ([], $entries); |
999 | } |
1180 | } |
1000 | |
1181 | |
1001 | my (@dirs, @nondirs); |
1182 | my (@dirs, @nondirs); |
1002 | |
1183 | |
1003 | my $statgrp = add $grp aio_group sub { |
1184 | my $statgrp = add $grp aio_group sub { |
1004 | $grp->result (\@dirs, \@nondirs); |
1185 | $grp->result (\@dirs, \@nondirs); |
1005 | }; |
1186 | }; |
1006 | |
1187 | |
1007 | limit $statgrp $maxreq; |
1188 | limit $statgrp $maxreq; |
1008 | feed $statgrp sub { |
1189 | feed $statgrp sub { |
1009 | return unless @$entries; |
1190 | return unless @$entries; |
1010 | my $entry = shift @$entries; |
1191 | my $entry = shift @$entries; |
1011 | |
1192 | |
1012 | aioreq_pri $pri; |
1193 | aioreq_pri $pri; |
|
|
1194 | $wd->[1] = "$entry/."; |
1013 | add $statgrp aio_stat "$path/$entry/.", sub { |
1195 | add $statgrp aio_stat $wd, sub { |
1014 | if ($_[0] < 0) { |
1196 | if ($_[0] < 0) { |
1015 | push @nondirs, $entry; |
1197 | push @nondirs, $entry; |
1016 | } else { |
1198 | } else { |
1017 | # need to check for real directory |
1199 | # need to check for real directory |
1018 | aioreq_pri $pri; |
1200 | aioreq_pri $pri; |
|
|
1201 | $wd->[1] = $entry; |
1019 | add $statgrp aio_lstat "$path/$entry", sub { |
1202 | add $statgrp aio_lstat $wd, sub { |
1020 | if (-d _) { |
1203 | if (-d _) { |
1021 | push @dirs, $entry; |
1204 | push @dirs, $entry; |
1022 | |
1205 | |
1023 | unless (--$ndirs) { |
1206 | unless (--$ndirs) { |
1024 | push @nondirs, @$entries; |
1207 | push @nondirs, @$entries; |
1025 | feed $statgrp; |
1208 | feed $statgrp; |
|
|
1209 | } |
|
|
1210 | } else { |
|
|
1211 | push @nondirs, $entry; |
1026 | } |
1212 | } |
1027 | } else { |
|
|
1028 | push @nondirs, $entry; |
|
|
1029 | } |
1213 | } |
1030 | } |
1214 | } |
1031 | } |
1215 | }; |
1032 | }; |
1216 | }; |
1033 | }; |
1217 | }; |
1034 | }; |
1218 | }; |
1035 | }; |
1219 | }; |
1036 | }; |
1220 | }; |
… | |
… | |
1039 | } |
1223 | } |
1040 | |
1224 | |
1041 | =item aio_rmtree $pathname, $callback->($status) |
1225 | =item aio_rmtree $pathname, $callback->($status) |
1042 | |
1226 | |
1043 | Delete a directory tree starting (and including) C<$path>, return the |
1227 | Delete a directory tree starting (and including) C<$path>, return the |
1044 | status of the final C<rmdir> only. This is a composite request that |
1228 | status of the final C<rmdir> only. This is a composite request that |
1045 | uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
1229 | uses C<aio_scandir> to recurse into and rmdir directories, and unlink |
1046 | everything else. |
1230 | everything else. |
1047 | |
1231 | |
1048 | =cut |
1232 | =cut |
1049 | |
1233 | |
… | |
… | |
1070 | add $grp $dirgrp; |
1254 | add $grp $dirgrp; |
1071 | }; |
1255 | }; |
1072 | |
1256 | |
1073 | $grp |
1257 | $grp |
1074 | } |
1258 | } |
|
|
1259 | |
|
|
1260 | =item aio_fcntl $fh, $cmd, $arg, $callback->($status) |
|
|
1261 | |
|
|
1262 | =item aio_ioctl $fh, $request, $buf, $callback->($status) |
|
|
1263 | |
|
|
1264 | These work just like the C<fcntl> and C<ioctl> built-in functions, except |
|
|
1265 | they execute asynchronously and pass the return value to the callback. |
|
|
1266 | |
|
|
1267 | Both calls can be used for a lot of things, some of which make more sense |
|
|
1268 | to run asynchronously in their own thread, while some others make less |
|
|
1269 | sense. For example, calls that block waiting for external events, such |
|
|
1270 | as locking, will also lock down an I/O thread while it is waiting, which |
|
|
1271 | can deadlock the whole I/O system. At the same time, there might be no |
|
|
1272 | alternative to using a thread to wait. |
|
|
1273 | |
|
|
1274 | So in general, you should only use these calls for things that do |
|
|
1275 | (filesystem) I/O, not for things that wait for other events (network, |
|
|
1276 | other processes), although if you are careful and know what you are doing, |
|
|
1277 | you still can. |
|
|
1278 | |
|
|
1279 | The following constants are available (missing ones are, as usual C<0>): |
|
|
1280 | |
|
|
1281 | C<F_DUPFD_CLOEXEC>, |
|
|
1282 | |
|
|
1283 | C<F_OFD_GETLK>, C<F_OFD_SETLK>, C<F_OFD_GETLKW>, |
|
|
1284 | |
|
|
1285 | C<FIFREEZE>, C<FITHAW>, C<FITRIM>, C<FICLONE>, C<FICLONERANGE>, C<FIDEDUPERANGE>. |
|
|
1286 | |
|
|
1287 | C<FS_IOC_GETFLAGS>, C<FS_IOC_SETFLAGS>, C<FS_IOC_GETVERSION>, C<FS_IOC_SETVERSION>, |
|
|
1288 | C<FS_IOC_FIEMAP>. |
|
|
1289 | |
|
|
1290 | C<FS_IOC_FSGETXATTR>, C<FS_IOC_FSSETXATTR>, C<FS_IOC_SET_ENCRYPTION_POLICY>, |
|
|
1291 | C<FS_IOC_GET_ENCRYPTION_PWSALT>, C<FS_IOC_GET_ENCRYPTION_POLICY>, C<FS_KEY_DESCRIPTOR_SIZE>. |
|
|
1292 | |
|
|
1293 | C<FS_SECRM_FL>, C<FS_UNRM_FL>, C<FS_COMPR_FL>, C<FS_SYNC_FL>, C<FS_IMMUTABLE_FL>, |
|
|
1294 | C<FS_APPEND_FL>, C<FS_NODUMP_FL>, C<FS_NOATIME_FL>, C<FS_DIRTY_FL>, |
|
|
1295 | C<FS_COMPRBLK_FL>, C<FS_NOCOMP_FL>, C<FS_ENCRYPT_FL>, C<FS_BTREE_FL>, |
|
|
1296 | C<FS_INDEX_FL>, C<FS_JOURNAL_DATA_FL>, C<FS_NOTAIL_FL>, C<FS_DIRSYNC_FL>, C<FS_TOPDIR_FL>, |
|
|
1297 | C<FS_FL_USER_MODIFIABLE>. |
|
|
1298 | |
|
|
1299 | C<FS_XFLAG_REALTIME>, C<FS_XFLAG_PREALLOC>, C<FS_XFLAG_IMMUTABLE>, C<FS_XFLAG_APPEND>, |
|
|
1300 | C<FS_XFLAG_SYNC>, C<FS_XFLAG_NOATIME>, C<FS_XFLAG_NODUMP>, C<FS_XFLAG_RTINHERIT>, |
|
|
1301 | C<FS_XFLAG_PROJINHERIT>, C<FS_XFLAG_NOSYMLINKS>, C<FS_XFLAG_EXTSIZE>, C<FS_XFLAG_EXTSZINHERIT>, |
|
|
1302 | C<FS_XFLAG_NODEFRAG>, C<FS_XFLAG_FILESTREAM>, C<FS_XFLAG_DAX>, C<FS_XFLAG_HASATTR>, |
1075 | |
1303 | |
1076 | =item aio_sync $callback->($status) |
1304 | =item aio_sync $callback->($status) |
1077 | |
1305 | |
1078 | Asynchronously call sync and call the callback when finished. |
1306 | Asynchronously call sync and call the callback when finished. |
1079 | |
1307 | |
… | |
… | |
1148 | }; |
1376 | }; |
1149 | |
1377 | |
1150 | $grp |
1378 | $grp |
1151 | } |
1379 | } |
1152 | |
1380 | |
1153 | =item aio_msync $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
1381 | =item aio_msync $scalar, $offset = 0, $length = undef, flags = MS_SYNC, $callback->($status) |
1154 | |
1382 | |
1155 | This is a rather advanced IO::AIO call, which only works on mmap(2)ed |
1383 | This is a rather advanced IO::AIO call, which only works on mmap(2)ed |
1156 | scalars (see the C<IO::AIO::mmap> function, although it also works on data |
1384 | scalars (see the C<IO::AIO::mmap> function, although it also works on data |
1157 | scalars managed by the L<Sys::Mmap> or L<Mmap> modules, note that the |
1385 | scalars managed by the L<Sys::Mmap> or L<Mmap> modules, note that the |
1158 | scalar must only be modified in-place while an aio operation is pending on |
1386 | scalar must only be modified in-place while an aio operation is pending on |
… | |
… | |
1160 | |
1388 | |
1161 | It calls the C<msync> function of your OS, if available, with the memory |
1389 | It calls the C<msync> function of your OS, if available, with the memory |
1162 | area starting at C<$offset> in the string and ending C<$length> bytes |
1390 | area starting at C<$offset> in the string and ending C<$length> bytes |
1163 | later. If C<$length> is negative, counts from the end, and if C<$length> |
1391 | later. If C<$length> is negative, counts from the end, and if C<$length> |
1164 | is C<undef>, then it goes till the end of the string. The flags can be |
1392 | is C<undef>, then it goes till the end of the string. The flags can be |
1165 | a combination of C<IO::AIO::MS_ASYNC>, C<IO::AIO::MS_INVALIDATE> and |
1393 | either C<IO::AIO::MS_ASYNC> or C<IO::AIO::MS_SYNC>, plus an optional |
1166 | C<IO::AIO::MS_SYNC>. |
1394 | C<IO::AIO::MS_INVALIDATE>. |
1167 | |
1395 | |
1168 | =item aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
1396 | =item aio_mtouch $scalar, $offset = 0, $length = undef, flags = 0, $callback->($status) |
1169 | |
1397 | |
1170 | This is a rather advanced IO::AIO call, which works best on mmap(2)ed |
1398 | This is a rather advanced IO::AIO call, which works best on mmap(2)ed |
1171 | scalars. |
1399 | scalars. |
1172 | |
1400 | |
1173 | It touches (reads or writes) all memory pages in the specified |
1401 | It touches (reads or writes) all memory pages in the specified |
1174 | range inside the scalar. All caveats and parameters are the same |
1402 | range inside the scalar. All caveats and parameters are the same |
1175 | as for C<aio_msync>, above, except for flags, which must be either |
1403 | as for C<aio_msync>, above, except for flags, which must be either |
1176 | C<0> (which reads all pages and ensures they are instantiated) or |
1404 | C<0> (which reads all pages and ensures they are instantiated) or |
1177 | C<IO::AIO::MT_MODIFY>, which modifies the memory page s(by reading and |
1405 | C<IO::AIO::MT_MODIFY>, which modifies the memory pages (by reading and |
1178 | writing an octet from it, which dirties the page). |
1406 | writing an octet from it, which dirties the page). |
1179 | |
1407 | |
1180 | =item aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
1408 | =item aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
1181 | |
1409 | |
1182 | This is a rather advanced IO::AIO call, which works best on mmap(2)ed |
1410 | This is a rather advanced IO::AIO call, which works best on mmap(2)ed |
… | |
… | |
1213 | documented under L<MISCELLANEOUS FUNCTIONS>. |
1441 | documented under L<MISCELLANEOUS FUNCTIONS>. |
1214 | |
1442 | |
1215 | Example: asynchronously lock all current and future pages into memory. |
1443 | Example: asynchronously lock all current and future pages into memory. |
1216 | |
1444 | |
1217 | aio_mlockall IO::AIO::MCL_FUTURE; |
1445 | aio_mlockall IO::AIO::MCL_FUTURE; |
|
|
1446 | |
|
|
1447 | =item aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
|
|
1448 | |
|
|
1449 | Queries the extents of the given file (by calling the Linux C<FIEMAP> |
|
|
1450 | ioctl, see L<http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for details). If |
|
|
1451 | the ioctl is not available on your OS, then this request will fail with |
|
|
1452 | C<ENOSYS>. |
|
|
1453 | |
|
|
1454 | C<$start> is the starting offset to query extents for, C<$length> is the |
|
|
1455 | size of the range to query - if it is C<undef>, then the whole file will |
|
|
1456 | be queried. |
|
|
1457 | |
|
|
1458 | C<$flags> is a combination of flags (C<IO::AIO::FIEMAP_FLAG_SYNC> or |
|
|
1459 | C<IO::AIO::FIEMAP_FLAG_XATTR> - C<IO::AIO::FIEMAP_FLAGS_COMPAT> is also |
|
|
1460 | exported), and is normally C<0> or C<IO::AIO::FIEMAP_FLAG_SYNC> to query |
|
|
1461 | the data portion. |
|
|
1462 | |
|
|
1463 | C<$count> is the maximum number of extent records to return. If it is |
|
|
1464 | C<undef>, then IO::AIO queries all extents of the range. As a very special |
|
|
1465 | case, if it is C<0>, then the callback receives the number of extents |
|
|
1466 | instead of the extents themselves (which is unreliable, see below). |
|
|
1467 | |
|
|
1468 | If an error occurs, the callback receives no arguments. The special |
|
|
1469 | C<errno> value C<IO::AIO::EBADR> is available to test for flag errors. |
|
|
1470 | |
|
|
1471 | Otherwise, the callback receives an array reference with extent |
|
|
1472 | structures. Each extent structure is an array reference itself, with the |
|
|
1473 | following members: |
|
|
1474 | |
|
|
1475 | [$logical, $physical, $length, $flags] |
|
|
1476 | |
|
|
1477 | Flags is any combination of the following flag values (typically either C<0> |
|
|
1478 | or C<IO::AIO::FIEMAP_EXTENT_LAST> (1)): |
|
|
1479 | |
|
|
1480 | C<IO::AIO::FIEMAP_EXTENT_LAST>, C<IO::AIO::FIEMAP_EXTENT_UNKNOWN>, |
|
|
1481 | C<IO::AIO::FIEMAP_EXTENT_DELALLOC>, C<IO::AIO::FIEMAP_EXTENT_ENCODED>, |
|
|
1482 | C<IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED>, C<IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED>, |
|
|
1483 | C<IO::AIO::FIEMAP_EXTENT_DATA_INLINE>, C<IO::AIO::FIEMAP_EXTENT_DATA_TAIL>, |
|
|
1484 | C<IO::AIO::FIEMAP_EXTENT_UNWRITTEN>, C<IO::AIO::FIEMAP_EXTENT_MERGED> or |
|
|
1485 | C<IO::AIO::FIEMAP_EXTENT_SHARED>. |
|
|
1486 | |
|
|
1487 | At the time of this writing (Linux 3.2), this requets is unreliable unless |
|
|
1488 | C<$count> is C<undef>, as the kernel has all sorts of bugs preventing |
|
|
1489 | it to return all extents of a range for files with large number of |
|
|
1490 | extents. The code works around all these issues if C<$count> is undef. |
1218 | |
1491 | |
1219 | =item aio_group $callback->(...) |
1492 | =item aio_group $callback->(...) |
1220 | |
1493 | |
1221 | This is a very special aio request: Instead of doing something, it is a |
1494 | This is a very special aio request: Instead of doing something, it is a |
1222 | container for other aio requests, which is useful if you want to bundle |
1495 | container for other aio requests, which is useful if you want to bundle |
… | |
… | |
1286 | object. This object stores the canonicalised, absolute version of the |
1559 | object. This object stores the canonicalised, absolute version of the |
1287 | path, and on systems that allow it, also a directory file descriptor. |
1560 | path, and on systems that allow it, also a directory file descriptor. |
1288 | |
1561 | |
1289 | Everywhere where a pathname is accepted by IO::AIO (e.g. in C<aio_stat> |
1562 | Everywhere where a pathname is accepted by IO::AIO (e.g. in C<aio_stat> |
1290 | or C<aio_unlink>), one can specify an array reference with an IO::AIO::WD |
1563 | or C<aio_unlink>), one can specify an array reference with an IO::AIO::WD |
1291 | object and a pathname instead. If the pathname is absolute, the |
1564 | object and a pathname instead (or the IO::AIO::WD object alone, which |
|
|
1565 | gets interpreted as C<[$wd, "."]>). If the pathname is absolute, the |
1292 | IO::AIO::WD objetc is ignored, otherwise the pathname is resolved relative |
1566 | IO::AIO::WD object is ignored, otherwise the pathname is resolved relative |
1293 | to that IO::AIO::WD object. |
1567 | to that IO::AIO::WD object. |
1294 | |
1568 | |
1295 | For example, to get a wd object for F</etc> and then stat F<passwd> |
1569 | For example, to get a wd object for F</etc> and then stat F<passwd> |
1296 | inside, you would write: |
1570 | inside, you would write: |
1297 | |
1571 | |
… | |
… | |
1305 | aio_stat [$etcdir, "passwd"], sub { |
1579 | aio_stat [$etcdir, "passwd"], sub { |
1306 | # yay |
1580 | # yay |
1307 | }; |
1581 | }; |
1308 | }; |
1582 | }; |
1309 | |
1583 | |
|
|
1584 | The fact that C<aio_wd> is a request and not a normal function shows that |
1310 | This shows that creating an IO::AIO::WD object is itself a potentially |
1585 | creating an IO::AIO::WD object is itself a potentially blocking operation, |
1311 | blocking operation, which is why it is done asynchronously. |
1586 | which is why it is done asynchronously. |
|
|
1587 | |
|
|
1588 | To stat the directory obtained with C<aio_wd> above, one could write |
|
|
1589 | either of the following three request calls: |
|
|
1590 | |
|
|
1591 | aio_lstat "/etc" , sub { ... # pathname as normal string |
|
|
1592 | aio_lstat [$wd, "."], sub { ... # "." relative to $wd (i.e. $wd itself) |
|
|
1593 | aio_lstat $wd , sub { ... # shorthand for the previous |
1312 | |
1594 | |
1313 | As with normal pathnames, IO::AIO keeps a copy of the working directory |
1595 | As with normal pathnames, IO::AIO keeps a copy of the working directory |
1314 | object and the pathname string, so you could write the following without |
1596 | object and the pathname string, so you could write the following without |
1315 | causing any issues due to C<$path> getting reused: |
1597 | causing any issues due to C<$path> getting reused: |
1316 | |
1598 | |
… | |
… | |
1326 | There are some caveats: when directories get renamed (or deleted), the |
1608 | There are some caveats: when directories get renamed (or deleted), the |
1327 | pathname string doesn't change, so will point to the new directory (or |
1609 | pathname string doesn't change, so will point to the new directory (or |
1328 | nowhere at all), while the directory fd, if available on the system, |
1610 | nowhere at all), while the directory fd, if available on the system, |
1329 | will still point to the original directory. Most functions accepting a |
1611 | will still point to the original directory. Most functions accepting a |
1330 | pathname will use the directory fd on newer systems, and the string on |
1612 | pathname will use the directory fd on newer systems, and the string on |
1331 | older systems. Some functions (such as realpath) will always rely on the |
1613 | older systems. Some functions (such as C<aio_realpath>) will always rely on |
1332 | string form of the pathname. |
1614 | the string form of the pathname. |
1333 | |
1615 | |
1334 | So this fucntionality is mainly useful to get some protection against |
1616 | So this functionality is mainly useful to get some protection against |
1335 | C<chdir>, to easily get an absolute path out of a relative path for future |
1617 | C<chdir>, to easily get an absolute path out of a relative path for future |
1336 | reference, and to speed up doing many operations in the same directory |
1618 | reference, and to speed up doing many operations in the same directory |
1337 | (e.g. when stat'ing all files in a directory). |
1619 | (e.g. when stat'ing all files in a directory). |
1338 | |
1620 | |
1339 | The following functions implement this working directory abstraction: |
1621 | The following functions implement this working directory abstraction: |
… | |
… | |
1352 | passing C<undef> as working directory component of a pathname fails the |
1634 | passing C<undef> as working directory component of a pathname fails the |
1353 | request with C<ENOENT>, there is often no need for error checking in the |
1635 | request with C<ENOENT>, there is often no need for error checking in the |
1354 | C<aio_wd> callback, as future requests using the value will fail in the |
1636 | C<aio_wd> callback, as future requests using the value will fail in the |
1355 | expected way. |
1637 | expected way. |
1356 | |
1638 | |
1357 | If this call isn't available because your OS lacks it or it couldn't be |
|
|
1358 | detected, it will be emulated by calling C<fsync> instead. |
|
|
1359 | |
|
|
1360 | =item IO::AIO::CWD |
1639 | =item IO::AIO::CWD |
1361 | |
1640 | |
1362 | This is a compiletime constant (object) that represents the process |
1641 | This is a compiletime constant (object) that represents the process |
1363 | current working directory. |
1642 | current working directory. |
1364 | |
1643 | |
1365 | Specifying this object as working directory object for a pathname is as |
1644 | Specifying this object as working directory object for a pathname is as if |
1366 | if the pathname would be specified directly, without a directory object, |
1645 | the pathname would be specified directly, without a directory object. For |
1367 | e.g., these calls are functionally identical: |
1646 | example, these calls are functionally identical: |
1368 | |
1647 | |
1369 | aio_stat "somefile", sub { ... }; |
1648 | aio_stat "somefile", sub { ... }; |
1370 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
1649 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
1371 | |
1650 | |
1372 | =back |
1651 | =back |
1373 | |
1652 | |
|
|
1653 | To recover the path associated with an IO::AIO::WD object, you can use |
|
|
1654 | C<aio_realpath>: |
|
|
1655 | |
|
|
1656 | aio_realpath $wd, sub { |
|
|
1657 | warn "path is $_[0]\n"; |
|
|
1658 | }; |
|
|
1659 | |
|
|
1660 | Currently, C<aio_statvfs> always, and C<aio_rename> and C<aio_rmdir> |
|
|
1661 | sometimes, fall back to using an absolue path. |
1374 | |
1662 | |
1375 | =head2 IO::AIO::REQ CLASS |
1663 | =head2 IO::AIO::REQ CLASS |
1376 | |
1664 | |
1377 | All non-aggregate C<aio_*> functions return an object of this class when |
1665 | All non-aggregate C<aio_*> functions return an object of this class when |
1378 | called in non-void context. |
1666 | called in non-void context. |
… | |
… | |
1496 | |
1784 | |
1497 | Sets a feeder/generator on this group: every group can have an attached |
1785 | Sets a feeder/generator on this group: every group can have an attached |
1498 | generator that generates requests if idle. The idea behind this is that, |
1786 | generator that generates requests if idle. The idea behind this is that, |
1499 | although you could just queue as many requests as you want in a group, |
1787 | although you could just queue as many requests as you want in a group, |
1500 | this might starve other requests for a potentially long time. For example, |
1788 | this might starve other requests for a potentially long time. For example, |
1501 | C<aio_scandir> might generate hundreds of thousands C<aio_stat> requests, |
1789 | C<aio_scandir> might generate hundreds of thousands of C<aio_stat> |
1502 | delaying any later requests for a long time. |
1790 | requests, delaying any later requests for a long time. |
1503 | |
1791 | |
1504 | To avoid this, and allow incremental generation of requests, you can |
1792 | To avoid this, and allow incremental generation of requests, you can |
1505 | instead a group and set a feeder on it that generates those requests. The |
1793 | instead a group and set a feeder on it that generates those requests. The |
1506 | feed callback will be called whenever there are few enough (see C<limit>, |
1794 | feed callback will be called whenever there are few enough (see C<limit>, |
1507 | below) requests active in the group itself and is expected to queue more |
1795 | below) requests active in the group itself and is expected to queue more |
… | |
… | |
1556 | |
1844 | |
1557 | See C<poll_cb> for an example. |
1845 | See C<poll_cb> for an example. |
1558 | |
1846 | |
1559 | =item IO::AIO::poll_cb |
1847 | =item IO::AIO::poll_cb |
1560 | |
1848 | |
1561 | Process some outstanding events on the result pipe. You have to call |
1849 | Process some requests that have reached the result phase (i.e. they have |
|
|
1850 | been executed but the results are not yet reported). You have to call |
|
|
1851 | this "regularly" to finish outstanding requests. |
|
|
1852 | |
1562 | this regularly. Returns C<0> if all events could be processed (or there |
1853 | Returns C<0> if all events could be processed (or there were no |
1563 | were no events to process), or C<-1> if it returned earlier for whatever |
1854 | events to process), or C<-1> if it returned earlier for whatever |
1564 | reason. Returns immediately when no events are outstanding. The amount of |
1855 | reason. Returns immediately when no events are outstanding. The amount |
1565 | events processed depends on the settings of C<IO::AIO::max_poll_req> and |
1856 | of events processed depends on the settings of C<IO::AIO::max_poll_req>, |
1566 | C<IO::AIO::max_poll_time>. |
1857 | C<IO::AIO::max_poll_time> and C<IO::AIO::max_outstanding>. |
1567 | |
1858 | |
1568 | If not all requests were processed for whatever reason, the filehandle |
1859 | If not all requests were processed for whatever reason, the poll file |
1569 | will still be ready when C<poll_cb> returns, so normally you don't have to |
1860 | descriptor will still be ready when C<poll_cb> returns, so normally you |
1570 | do anything special to have it called later. |
1861 | don't have to do anything special to have it called later. |
1571 | |
1862 | |
1572 | Apart from calling C<IO::AIO::poll_cb> when the event filehandle becomes |
1863 | Apart from calling C<IO::AIO::poll_cb> when the event filehandle becomes |
1573 | ready, it can be beneficial to call this function from loops which submit |
1864 | ready, it can be beneficial to call this function from loops which submit |
1574 | a lot of requests, to make sure the results get processed when they become |
1865 | a lot of requests, to make sure the results get processed when they become |
1575 | available and not just when the loop is finished and the event loop takes |
1866 | available and not just when the loop is finished and the event loop takes |
… | |
… | |
1584 | poll => 'r', async => 1, |
1875 | poll => 'r', async => 1, |
1585 | cb => \&IO::AIO::poll_cb); |
1876 | cb => \&IO::AIO::poll_cb); |
1586 | |
1877 | |
1587 | =item IO::AIO::poll_wait |
1878 | =item IO::AIO::poll_wait |
1588 | |
1879 | |
1589 | If there are any outstanding requests and none of them in the result |
1880 | Wait until either at least one request is in the result phase or no |
1590 | phase, wait till the result filehandle becomes ready for reading (simply |
1881 | requests are outstanding anymore. |
1591 | does a C<select> on the filehandle. This is useful if you want to |
1882 | |
1592 | synchronously wait for some requests to finish). |
1883 | This is useful if you want to synchronously wait for some requests to |
|
|
1884 | become ready, without actually handling them. |
1593 | |
1885 | |
1594 | See C<nreqs> for an example. |
1886 | See C<nreqs> for an example. |
1595 | |
1887 | |
1596 | =item IO::AIO::poll |
1888 | =item IO::AIO::poll |
1597 | |
1889 | |
… | |
… | |
1718 | |
2010 | |
1719 | This is a very bad function to use in interactive programs because it |
2011 | This is a very bad function to use in interactive programs because it |
1720 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
2012 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1721 | use an C<aio_group> together with a feed callback. |
2013 | use an C<aio_group> together with a feed callback. |
1722 | |
2014 | |
1723 | It's main use is in scripts without an event loop - when you want to stat |
2015 | Its main use is in scripts without an event loop - when you want to stat |
1724 | a lot of files, you can write somehting like this: |
2016 | a lot of files, you can write something like this: |
1725 | |
2017 | |
1726 | IO::AIO::max_outstanding 32; |
2018 | IO::AIO::max_outstanding 32; |
1727 | |
2019 | |
1728 | for my $path (...) { |
2020 | for my $path (...) { |
1729 | aio_stat $path , ...; |
2021 | aio_stat $path , ...; |
… | |
… | |
1768 | |
2060 | |
1769 | =back |
2061 | =back |
1770 | |
2062 | |
1771 | =head3 MISCELLANEOUS FUNCTIONS |
2063 | =head3 MISCELLANEOUS FUNCTIONS |
1772 | |
2064 | |
1773 | IO::AIO implements some functions that might be useful, but are not |
2065 | IO::AIO implements some functions that are useful when you want to use |
1774 | asynchronous. |
2066 | some "Advanced I/O" function not available to in Perl, without going the |
|
|
2067 | "Asynchronous I/O" route. Many of these have an asynchronous C<aio_*> |
|
|
2068 | counterpart. |
1775 | |
2069 | |
1776 | =over 4 |
2070 | =over 4 |
|
|
2071 | |
|
|
2072 | =item $numfd = IO::AIO::get_fdlimit |
|
|
2073 | |
|
|
2074 | Tries to find the current file descriptor limit and returns it, or |
|
|
2075 | C<undef> and sets C<$!> in case of an error. The limit is one larger than |
|
|
2076 | the highest valid file descriptor number. |
|
|
2077 | |
|
|
2078 | =item IO::AIO::min_fdlimit [$numfd] |
|
|
2079 | |
|
|
2080 | Try to increase the current file descriptor limit(s) to at least C<$numfd> |
|
|
2081 | by changing the soft or hard file descriptor resource limit. If C<$numfd> |
|
|
2082 | is missing, it will try to set a very high limit, although this is not |
|
|
2083 | recommended when you know the actual minimum that you require. |
|
|
2084 | |
|
|
2085 | If the limit cannot be raised enough, the function makes a best-effort |
|
|
2086 | attempt to increase the limit as much as possible, using various |
|
|
2087 | tricks, while still failing. You can query the resulting limit using |
|
|
2088 | C<IO::AIO::get_fdlimit>. |
|
|
2089 | |
|
|
2090 | If an error occurs, returns C<undef> and sets C<$!>, otherwise returns |
|
|
2091 | true. |
1777 | |
2092 | |
1778 | =item IO::AIO::sendfile $ofh, $ifh, $offset, $count |
2093 | =item IO::AIO::sendfile $ofh, $ifh, $offset, $count |
1779 | |
2094 | |
1780 | Calls the C<eio_sendfile_sync> function, which is like C<aio_sendfile>, |
2095 | Calls the C<eio_sendfile_sync> function, which is like C<aio_sendfile>, |
1781 | but is blocking (this makes most sense if you know the input data is |
2096 | but is blocking (this makes most sense if you know the input data is |
… | |
… | |
1798 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
2113 | =item IO::AIO::madvise $scalar, $offset, $len, $advice |
1799 | |
2114 | |
1800 | Simply calls the C<posix_madvise> function (see its |
2115 | Simply calls the C<posix_madvise> function (see its |
1801 | manpage for details). The following advice constants are |
2116 | manpage for details). The following advice constants are |
1802 | available: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
2117 | available: C<IO::AIO::MADV_NORMAL>, C<IO::AIO::MADV_SEQUENTIAL>, |
1803 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, C<IO::AIO::MADV_DONTNEED>. |
2118 | C<IO::AIO::MADV_RANDOM>, C<IO::AIO::MADV_WILLNEED>, |
|
|
2119 | C<IO::AIO::MADV_DONTNEED>. |
|
|
2120 | |
|
|
2121 | If C<$offset> is negative, counts from the end. If C<$length> is negative, |
|
|
2122 | the remaining length of the C<$scalar> is used. If possible, C<$length> |
|
|
2123 | will be reduced to fit into the C<$scalar>. |
1804 | |
2124 | |
1805 | On systems that do not implement C<posix_madvise>, this function returns |
2125 | On systems that do not implement C<posix_madvise>, this function returns |
1806 | ENOSYS, otherwise the return value of C<posix_madvise>. |
2126 | ENOSYS, otherwise the return value of C<posix_madvise>. |
1807 | |
2127 | |
1808 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
2128 | =item IO::AIO::mprotect $scalar, $offset, $len, $protect |
… | |
… | |
1810 | Simply calls the C<mprotect> function on the preferably AIO::mmap'ed |
2130 | Simply calls the C<mprotect> function on the preferably AIO::mmap'ed |
1811 | $scalar (see its manpage for details). The following protect |
2131 | $scalar (see its manpage for details). The following protect |
1812 | constants are available: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>, |
2132 | constants are available: C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_READ>, |
1813 | C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>. |
2133 | C<IO::AIO::PROT_WRITE>, C<IO::AIO::PROT_EXEC>. |
1814 | |
2134 | |
|
|
2135 | If C<$offset> is negative, counts from the end. If C<$length> is negative, |
|
|
2136 | the remaining length of the C<$scalar> is used. If possible, C<$length> |
|
|
2137 | will be reduced to fit into the C<$scalar>. |
|
|
2138 | |
1815 | On systems that do not implement C<mprotect>, this function returns |
2139 | On systems that do not implement C<mprotect>, this function returns |
1816 | ENOSYS, otherwise the return value of C<mprotect>. |
2140 | ENOSYS, otherwise the return value of C<mprotect>. |
1817 | |
2141 | |
1818 | =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
2142 | =item IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
1819 | |
2143 | |
1820 | Memory-maps a file (or anonymous memory range) and attaches it to the |
2144 | Memory-maps a file (or anonymous memory range) and attaches it to the |
1821 | given C<$scalar>, which will act like a string scalar. |
2145 | given C<$scalar>, which will act like a string scalar. Returns true on |
|
|
2146 | success, and false otherwise. |
1822 | |
2147 | |
|
|
2148 | The scalar must exist, but its contents do not matter - this means you |
|
|
2149 | cannot use a nonexistant array or hash element. When in doubt, C<undef> |
|
|
2150 | the scalar first. |
|
|
2151 | |
1823 | The only operations allowed on the scalar are C<substr>/C<vec> that don't |
2152 | The only operations allowed on the mmapped scalar are C<substr>/C<vec>, |
1824 | change the string length, and most read-only operations such as copying it |
2153 | which don't change the string length, and most read-only operations such |
1825 | or searching it with regexes and so on. |
2154 | as copying it or searching it with regexes and so on. |
1826 | |
2155 | |
1827 | Anything else is unsafe and will, at best, result in memory leaks. |
2156 | Anything else is unsafe and will, at best, result in memory leaks. |
1828 | |
2157 | |
1829 | The memory map associated with the C<$scalar> is automatically removed |
2158 | The memory map associated with the C<$scalar> is automatically removed |
1830 | when the C<$scalar> is destroyed, or when the C<IO::AIO::mmap> or |
2159 | when the C<$scalar> is undef'd or destroyed, or when the C<IO::AIO::mmap> |
1831 | C<IO::AIO::munmap> functions are called. |
2160 | or C<IO::AIO::munmap> functions are called on it. |
1832 | |
2161 | |
1833 | This calls the C<mmap>(2) function internally. See your system's manual |
2162 | This calls the C<mmap>(2) function internally. See your system's manual |
1834 | page for details on the C<$length>, C<$prot> and C<$flags> parameters. |
2163 | page for details on the C<$length>, C<$prot> and C<$flags> parameters. |
1835 | |
2164 | |
1836 | The C<$length> must be larger than zero and smaller than the actual |
2165 | The C<$length> must be larger than zero and smaller than the actual |
1837 | filesize. |
2166 | filesize. |
1838 | |
2167 | |
1839 | C<$prot> is a combination of C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_EXEC>, |
2168 | C<$prot> is a combination of C<IO::AIO::PROT_NONE>, C<IO::AIO::PROT_EXEC>, |
1840 | C<IO::AIO::PROT_READ> and/or C<IO::AIO::PROT_WRITE>, |
2169 | C<IO::AIO::PROT_READ> and/or C<IO::AIO::PROT_WRITE>, |
1841 | |
2170 | |
1842 | C<$flags> can be a combination of C<IO::AIO::MAP_SHARED> or |
2171 | C<$flags> can be a combination of |
1843 | C<IO::AIO::MAP_PRIVATE>, or a number of system-specific flags (when |
2172 | C<IO::AIO::MAP_SHARED> or |
1844 | not available, the are defined as 0): C<IO::AIO::MAP_ANONYMOUS> |
2173 | C<IO::AIO::MAP_PRIVATE>, |
|
|
2174 | or a number of system-specific flags (when not available, the are C<0>): |
1845 | (which is set to C<MAP_ANON> if your system only provides this |
2175 | C<IO::AIO::MAP_ANONYMOUS> (which is set to C<MAP_ANON> if your system only provides this constant), |
1846 | constant), C<IO::AIO::MAP_HUGETLB>, C<IO::AIO::MAP_LOCKED>, |
2176 | C<IO::AIO::MAP_LOCKED>, |
1847 | C<IO::AIO::MAP_NORESERVE>, C<IO::AIO::MAP_POPULATE> or |
2177 | C<IO::AIO::MAP_NORESERVE>, |
|
|
2178 | C<IO::AIO::MAP_POPULATE>, |
1848 | C<IO::AIO::MAP_NONBLOCK> |
2179 | C<IO::AIO::MAP_NONBLOCK>, |
|
|
2180 | C<IO::AIO::MAP_FIXED>, |
|
|
2181 | C<IO::AIO::MAP_GROWSDOWN>, |
|
|
2182 | C<IO::AIO::MAP_32BIT>, |
|
|
2183 | C<IO::AIO::MAP_HUGETLB> or |
|
|
2184 | C<IO::AIO::MAP_STACK>. |
1849 | |
2185 | |
1850 | If C<$fh> is C<undef>, then a file descriptor of C<-1> is passed. |
2186 | If C<$fh> is C<undef>, then a file descriptor of C<-1> is passed. |
1851 | |
2187 | |
1852 | C<$offset> is the offset from the start of the file - it generally must be |
2188 | C<$offset> is the offset from the start of the file - it generally must be |
1853 | a multiple of C<IO::AIO::PAGESIZE> and defaults to C<0>. |
2189 | a multiple of C<IO::AIO::PAGESIZE> and defaults to C<0>. |
… | |
… | |
1878 | |
2214 | |
1879 | Calls the C<munlockall> function. |
2215 | Calls the C<munlockall> function. |
1880 | |
2216 | |
1881 | On systems that do not implement C<munlockall>, this function returns |
2217 | On systems that do not implement C<munlockall>, this function returns |
1882 | ENOSYS, otherwise the return value of C<munlockall>. |
2218 | ENOSYS, otherwise the return value of C<munlockall>. |
|
|
2219 | |
|
|
2220 | =item IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
|
|
2221 | |
|
|
2222 | Calls the GNU/Linux C<splice(2)> syscall, if available. If C<$r_off> or |
|
|
2223 | C<$w_off> are C<undef>, then C<NULL> is passed for these, otherwise they |
|
|
2224 | should be the file offset. |
|
|
2225 | |
|
|
2226 | C<$r_fh> and C<$w_fh> should not refer to the same file, as splice might |
|
|
2227 | silently corrupt the data in this case. |
|
|
2228 | |
|
|
2229 | The following symbol flag values are available: C<IO::AIO::SPLICE_F_MOVE>, |
|
|
2230 | C<IO::AIO::SPLICE_F_NONBLOCK>, C<IO::AIO::SPLICE_F_MORE> and |
|
|
2231 | C<IO::AIO::SPLICE_F_GIFT>. |
|
|
2232 | |
|
|
2233 | See the C<splice(2)> manpage for details. |
|
|
2234 | |
|
|
2235 | =item IO::AIO::tee $r_fh, $w_fh, $length, $flags |
|
|
2236 | |
|
|
2237 | Calls the GNU/Linux C<tee(2)> syscall, see its manpage and the |
|
|
2238 | description for C<IO::AIO::splice> above for details. |
|
|
2239 | |
|
|
2240 | =item $actual_size = IO::AIO::pipesize $r_fh[, $new_size] |
|
|
2241 | |
|
|
2242 | Attempts to query or change the pipe buffer size. Obviously works only |
|
|
2243 | on pipes, and currently works only on GNU/Linux systems, and fails with |
|
|
2244 | C<-1>/C<ENOSYS> everywhere else. If anybody knows how to influence pipe buffer |
|
|
2245 | size on other systems, drop me a note. |
|
|
2246 | |
|
|
2247 | =item ($rfh, $wfh) = IO::AIO::pipe2 [$flags] |
|
|
2248 | |
|
|
2249 | This is a direct interface to the Linux L<pipe2(2)> system call. If |
|
|
2250 | C<$flags> is missing or C<0>, then this should be the same as a call to |
|
|
2251 | perl's built-in C<pipe> function and create a new pipe, and works on |
|
|
2252 | systems that lack the pipe2 syscall. On win32, this case invokes C<_pipe |
|
|
2253 | (..., 4096, O_BINARY)>. |
|
|
2254 | |
|
|
2255 | If C<$flags> is non-zero, it tries to invoke the pipe2 system call with |
|
|
2256 | the given flags (Linux 2.6.27, glibc 2.9). |
|
|
2257 | |
|
|
2258 | On success, the read and write file handles are returned. |
|
|
2259 | |
|
|
2260 | On error, nothing will be returned. If the pipe2 syscall is missing and |
|
|
2261 | C<$flags> is non-zero, fails with C<ENOSYS>. |
|
|
2262 | |
|
|
2263 | Please refer to L<pipe2(2)> for more info on the C<$flags>, but at the |
|
|
2264 | time of this writing, C<IO::AIO::O_CLOEXEC>, C<IO::AIO::O_NONBLOCK> and |
|
|
2265 | C<IO::AIO::O_DIRECT> (Linux 3.4, for packet-based pipes) were supported. |
1883 | |
2266 | |
1884 | =back |
2267 | =back |
1885 | |
2268 | |
1886 | =cut |
2269 | =cut |
1887 | |
2270 | |