… | |
… | |
14 | aio_unlink "/tmp/file", sub { }; |
14 | aio_unlink "/tmp/file", sub { }; |
15 | |
15 | |
16 | aio_read $fh, 30000, 1024, $buffer, 0, sub { |
16 | aio_read $fh, 30000, 1024, $buffer, 0, sub { |
17 | $_[0] > 0 or die "read error: $!"; |
17 | $_[0] > 0 or die "read error: $!"; |
18 | }; |
18 | }; |
|
|
19 | |
|
|
20 | # AnyEvent |
|
|
21 | open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!"; |
|
|
22 | my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb }); |
19 | |
23 | |
20 | # Event |
24 | # Event |
21 | Event->io (fd => IO::AIO::poll_fileno, |
25 | Event->io (fd => IO::AIO::poll_fileno, |
22 | poll => 'r', |
26 | poll => 'r', |
23 | cb => \&IO::AIO::poll_cb); |
27 | cb => \&IO::AIO::poll_cb); |
… | |
… | |
63 | use base 'Exporter'; |
67 | use base 'Exporter'; |
64 | |
68 | |
65 | use Fcntl (); |
69 | use Fcntl (); |
66 | |
70 | |
67 | BEGIN { |
71 | BEGIN { |
68 | $VERSION = 1.5; |
72 | $VERSION = '1.71'; |
69 | |
73 | |
70 | @EXPORT = qw(aio_read aio_write aio_open aio_close aio_stat aio_lstat aio_unlink |
74 | @EXPORT = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
|
|
75 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
71 | aio_rmdir aio_symlink aio_fsync aio_fdatasync aio_readahead); |
76 | aio_fsync aio_fdatasync aio_readahead); |
72 | @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs); |
77 | @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel |
|
|
78 | max_outstanding nreqs); |
73 | |
79 | |
74 | require XSLoader; |
80 | require XSLoader; |
75 | XSLoader::load IO::AIO, $VERSION; |
81 | XSLoader::load IO::AIO, $VERSION; |
76 | } |
82 | } |
77 | |
83 | |
… | |
… | |
103 | environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
109 | environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
104 | use something else. |
110 | use something else. |
105 | |
111 | |
106 | =over 4 |
112 | =over 4 |
107 | |
113 | |
108 | =item aio_open $pathname, $flags, $mode, $callback |
114 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
109 | |
115 | |
110 | Asynchronously open or create a file and call the callback with a newly |
116 | Asynchronously open or create a file and call the callback with a newly |
111 | created filehandle for the file. |
117 | created filehandle for the file. |
112 | |
118 | |
113 | The pathname passed to C<aio_open> must be absolute. See API NOTES, above, |
119 | The pathname passed to C<aio_open> must be absolute. See API NOTES, above, |
… | |
… | |
130 | } else { |
136 | } else { |
131 | die "open failed: $!\n"; |
137 | die "open failed: $!\n"; |
132 | } |
138 | } |
133 | }; |
139 | }; |
134 | |
140 | |
135 | =item aio_close $fh, $callback |
141 | =item aio_close $fh, $callback->($status) |
136 | |
142 | |
137 | Asynchronously close a file and call the callback with the result |
143 | Asynchronously close a file and call the callback with the result |
138 | code. I<WARNING:> although accepted, you should not pass in a perl |
144 | code. I<WARNING:> although accepted, you should not pass in a perl |
139 | filehandle here, as perl will likely close the file descriptor another |
145 | filehandle here, as perl will likely close the file descriptor another |
140 | time when the filehandle is destroyed. Normally, you can safely call perls |
146 | time when the filehandle is destroyed. Normally, you can safely call perls |
141 | C<close> or just let filehandles go out of scope. |
147 | C<close> or just let filehandles go out of scope. |
142 | |
148 | |
143 | This is supposed to be a bug in the API, so that might change. It's |
149 | This is supposed to be a bug in the API, so that might change. It's |
144 | therefore best to avoid this function. |
150 | therefore best to avoid this function. |
145 | |
151 | |
146 | =item aio_read $fh,$offset,$length, $data,$dataoffset,$callback |
152 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
147 | |
153 | |
148 | =item aio_write $fh,$offset,$length, $data,$dataoffset,$callback |
154 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
149 | |
155 | |
150 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
156 | Reads or writes C<length> bytes from the specified C<fh> and C<offset> |
151 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
157 | into the scalar given by C<data> and offset C<dataoffset> and calls the |
152 | callback without the actual number of bytes read (or -1 on error, just |
158 | callback without the actual number of bytes read (or -1 on error, just |
153 | like the syscall). |
159 | like the syscall). |
… | |
… | |
162 | aio_read $fh, 7, 15, $buffer, 0, sub { |
168 | aio_read $fh, 7, 15, $buffer, 0, sub { |
163 | $_[0] > 0 or die "read error: $!"; |
169 | $_[0] > 0 or die "read error: $!"; |
164 | print "read $_[0] bytes: <$buffer>\n"; |
170 | print "read $_[0] bytes: <$buffer>\n"; |
165 | }; |
171 | }; |
166 | |
172 | |
167 | =item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback |
173 | =item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
168 | |
174 | |
169 | Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
175 | Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
170 | reading at byte offset C<$in_offset>, and starts writing at the current |
176 | reading at byte offset C<$in_offset>, and starts writing at the current |
171 | file offset of C<$out_fh>. Because of that, it is not safe to issue more |
177 | file offset of C<$out_fh>. Because of that, it is not safe to issue more |
172 | than one C<aio_sendfile> per C<$out_fh>, as they will interfere with each |
178 | than one C<aio_sendfile> per C<$out_fh>, as they will interfere with each |
… | |
… | |
175 | This call tries to make use of a native C<sendfile> syscall to provide |
181 | This call tries to make use of a native C<sendfile> syscall to provide |
176 | zero-copy operation. For this to work, C<$out_fh> should refer to a |
182 | zero-copy operation. For this to work, C<$out_fh> should refer to a |
177 | socket, and C<$in_fh> should refer to mmap'able file. |
183 | socket, and C<$in_fh> should refer to mmap'able file. |
178 | |
184 | |
179 | If the native sendfile call fails or is not implemented, it will be |
185 | If the native sendfile call fails or is not implemented, it will be |
180 | emulated, so you can call C<aio_sendfile> on any filehandles regardless of |
186 | emulated, so you can call C<aio_sendfile> on any type of filehandle |
181 | the limitations of the OS. |
187 | regardless of the limitations of the operating system. |
182 | |
188 | |
183 | Please note, however, that C<aio_sendfile> can read more bytes from |
189 | Please note, however, that C<aio_sendfile> can read more bytes from |
184 | C<$in_fh> than are written, and there is no way to find out how many |
190 | C<$in_fh> than are written, and there is no way to find out how many |
185 | bytes have been read form C<aio_sendfile> alone, as C<aio_sendfile> only |
191 | bytes have been read from C<aio_sendfile> alone, as C<aio_sendfile> only |
186 | provides the number of bytes written to C<$out_fh>. Only if the return |
192 | provides the number of bytes written to C<$out_fh>. Only if the result |
187 | value (the value provided to the callback) equals C<$length> one can |
193 | value equals C<$length> one can assume that C<$length> bytes have been |
188 | assume that C<$length> bytes have been read. |
194 | read. |
189 | |
195 | |
190 | =item aio_readahead $fh,$offset,$length, $callback |
196 | =item aio_readahead $fh,$offset,$length, $callback->($retval) |
191 | |
197 | |
192 | C<aio_readahead> populates the page cache with data from a file so that |
198 | C<aio_readahead> populates the page cache with data from a file so that |
193 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
199 | subsequent reads from that file will not block on disk I/O. The C<$offset> |
194 | argument specifies the starting point from which data is to be read and |
200 | argument specifies the starting point from which data is to be read and |
195 | C<$length> specifies the number of bytes to be read. I/O is performed in |
201 | C<$length> specifies the number of bytes to be read. I/O is performed in |
… | |
… | |
199 | file. The current file offset of the file is left unchanged. |
205 | file. The current file offset of the file is left unchanged. |
200 | |
206 | |
201 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
207 | If that syscall doesn't exist (likely if your OS isn't Linux) it will be |
202 | emulated by simply reading the data, which would have a similar effect. |
208 | emulated by simply reading the data, which would have a similar effect. |
203 | |
209 | |
204 | =item aio_stat $fh_or_path, $callback |
210 | =item aio_stat $fh_or_path, $callback->($status) |
205 | |
211 | |
206 | =item aio_lstat $fh, $callback |
212 | =item aio_lstat $fh, $callback->($status) |
207 | |
213 | |
208 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
214 | Works like perl's C<stat> or C<lstat> in void context. The callback will |
209 | be called after the stat and the results will be available using C<stat _> |
215 | be called after the stat and the results will be available using C<stat _> |
210 | or C<-s _> etc... |
216 | or C<-s _> etc... |
211 | |
217 | |
… | |
… | |
221 | aio_stat "/etc/passwd", sub { |
227 | aio_stat "/etc/passwd", sub { |
222 | $_[0] and die "stat failed: $!"; |
228 | $_[0] and die "stat failed: $!"; |
223 | print "size is ", -s _, "\n"; |
229 | print "size is ", -s _, "\n"; |
224 | }; |
230 | }; |
225 | |
231 | |
226 | =item aio_unlink $pathname, $callback |
232 | =item aio_unlink $pathname, $callback->($status) |
227 | |
233 | |
228 | Asynchronously unlink (delete) a file and call the callback with the |
234 | Asynchronously unlink (delete) a file and call the callback with the |
229 | result code. |
235 | result code. |
230 | |
236 | |
231 | =item aio_rmdir $pathname, $callback |
237 | =item aio_rmdir $pathname, $callback->($status) |
232 | |
238 | |
233 | Asynchronously rmdir (delete) a directory and call the callback with the |
239 | Asynchronously rmdir (delete) a directory and call the callback with the |
234 | result code. |
240 | result code. |
235 | |
241 | |
|
|
242 | =item aio_readdir $pathname, $callback->($entries) |
|
|
243 | |
|
|
244 | Unlike the POSIX call of the same name, C<aio_readdir> reads an entire |
|
|
245 | directory (i.e. opendir + readdir + closedir). The entries will not be |
|
|
246 | sorted, and will B<NOT> include the C<.> and C<..> entries. |
|
|
247 | |
|
|
248 | The callback a single argument which is either C<undef> or an array-ref |
|
|
249 | with the filenames. |
|
|
250 | |
|
|
251 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
|
|
252 | |
|
|
253 | Scans a directory (similar to C<aio_readdir>) and tries to separate the |
|
|
254 | entries of directory C<$path> into two sets of names, ones you can recurse |
|
|
255 | into (directories), and ones you cannot recurse into (everything else). |
|
|
256 | |
|
|
257 | C<aio_scandir> is a composite request that consists of many |
|
|
258 | aio-primitives. C<$maxreq> specifies the maximum number of outstanding |
|
|
259 | aio requests that this function generates. If it is C<< <= 0 >>, then a |
|
|
260 | suitable default will be chosen (currently 8). |
|
|
261 | |
|
|
262 | On error, the callback is called without arguments, otherwise it receives |
|
|
263 | two array-refs with path-relative entry names. |
|
|
264 | |
|
|
265 | Example: |
|
|
266 | |
|
|
267 | aio_scandir $dir, 0, sub { |
|
|
268 | my ($dirs, $nondirs) = @_; |
|
|
269 | print "real directories: @$dirs\n"; |
|
|
270 | print "everything else: @$nondirs\n"; |
|
|
271 | }; |
|
|
272 | |
|
|
273 | Implementation notes. |
|
|
274 | |
|
|
275 | The C<aio_readdir> cannot be avoided, but C<stat()>'ing every entry can. |
|
|
276 | |
|
|
277 | After reading the directory, the modification time, size etc. of the |
|
|
278 | directory before and after the readdir is checked, and if they match, the |
|
|
279 | link count will be used to decide how many entries are directories (if |
|
|
280 | >= 2). Otherwise, no knowledge of the number of subdirectories will be |
|
|
281 | assumed. |
|
|
282 | |
|
|
283 | Then entires will be sorted into likely directories (everything without a |
|
|
284 | non-initial dot) and likely non-directories (everything else). Then every |
|
|
285 | entry + C</.> will be C<stat>'ed, likely directories first. This is often |
|
|
286 | faster because filesystems might detect the type of the entry without |
|
|
287 | reading the inode data (e.g. ext2s filetype feature). If that succeeds, |
|
|
288 | it assumes that the entry is a directory or a symlink to directory (which |
|
|
289 | will be checked seperately). |
|
|
290 | |
|
|
291 | If the known number of directories has been reached, the rest of the |
|
|
292 | entries is assumed to be non-directories. |
|
|
293 | |
|
|
294 | =cut |
|
|
295 | |
|
|
296 | sub aio_scandir($$$) { |
|
|
297 | my ($path, $maxreq, $cb) = @_; |
|
|
298 | |
|
|
299 | $maxreq = 8 if $maxreq <= 0; |
|
|
300 | |
|
|
301 | # stat once |
|
|
302 | aio_stat $path, sub { |
|
|
303 | $cb->() if $_[0]; |
|
|
304 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
305 | |
|
|
306 | # read the directory entries |
|
|
307 | aio_readdir $path, sub { |
|
|
308 | my $entries = shift |
|
|
309 | or return $cb->(); |
|
|
310 | |
|
|
311 | # stat the dir another time |
|
|
312 | aio_stat $path, sub { |
|
|
313 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
|
|
314 | |
|
|
315 | my $ndirs; |
|
|
316 | |
|
|
317 | # take the slow route if anything looks fishy |
|
|
318 | if ($hash1 ne $hash2) { |
|
|
319 | $ndirs = -1; |
|
|
320 | } else { |
|
|
321 | # if nlink == 2, we are finished |
|
|
322 | # on non-posix-fs's, we rely on nlink < 2 |
|
|
323 | $ndirs = (stat _)[3] - 2 |
|
|
324 | or return $cb->([], $entries); |
|
|
325 | } |
|
|
326 | |
|
|
327 | # sort into likely dirs and likely nondirs |
|
|
328 | # dirs == files without ".", short entries first |
|
|
329 | $entries = [map $_->[0], |
|
|
330 | sort { $b->[1] cmp $a->[1] } |
|
|
331 | map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], |
|
|
332 | @$entries]; |
|
|
333 | |
|
|
334 | my (@dirs, @nondirs); |
|
|
335 | |
|
|
336 | my ($statcb, $schedcb); |
|
|
337 | my $nreq = 0; |
|
|
338 | |
|
|
339 | $schedcb = sub { |
|
|
340 | if (@$entries) { |
|
|
341 | if ($nreq < $maxreq) { |
|
|
342 | my $ent = pop @$entries; |
|
|
343 | $nreq++; |
|
|
344 | aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) }; |
|
|
345 | } |
|
|
346 | } elsif (!$nreq) { |
|
|
347 | # finished |
|
|
348 | undef $statcb; |
|
|
349 | undef $schedcb; |
|
|
350 | $cb->(\@dirs, \@nondirs) if $cb; |
|
|
351 | undef $cb; |
|
|
352 | } |
|
|
353 | }; |
|
|
354 | $statcb = sub { |
|
|
355 | my ($status, $entry) = @_; |
|
|
356 | |
|
|
357 | if ($status < 0) { |
|
|
358 | $nreq--; |
|
|
359 | push @nondirs, $entry; |
|
|
360 | &$schedcb; |
|
|
361 | } else { |
|
|
362 | # need to check for real directory |
|
|
363 | aio_lstat "$path/$entry", sub { |
|
|
364 | $nreq--; |
|
|
365 | |
|
|
366 | if (-d _) { |
|
|
367 | push @dirs, $entry; |
|
|
368 | |
|
|
369 | if (!--$ndirs) { |
|
|
370 | push @nondirs, @$entries; |
|
|
371 | $entries = []; |
|
|
372 | } |
|
|
373 | } else { |
|
|
374 | push @nondirs, $entry; |
|
|
375 | } |
|
|
376 | |
|
|
377 | &$schedcb; |
|
|
378 | } |
|
|
379 | } |
|
|
380 | }; |
|
|
381 | |
|
|
382 | &$schedcb while @$entries && $nreq < $maxreq; |
|
|
383 | }; |
|
|
384 | }; |
|
|
385 | }; |
|
|
386 | } |
|
|
387 | |
236 | =item aio_fsync $fh, $callback |
388 | =item aio_fsync $fh, $callback->($status) |
237 | |
389 | |
238 | Asynchronously call fsync on the given filehandle and call the callback |
390 | Asynchronously call fsync on the given filehandle and call the callback |
239 | with the fsync result code. |
391 | with the fsync result code. |
240 | |
392 | |
241 | =item aio_fdatasync $fh, $callback |
393 | =item aio_fdatasync $fh, $callback->($status) |
242 | |
394 | |
243 | Asynchronously call fdatasync on the given filehandle and call the |
395 | Asynchronously call fdatasync on the given filehandle and call the |
244 | callback with the fdatasync result code. |
396 | callback with the fdatasync result code. |
245 | |
397 | |
246 | If this call isn't available because your OS lacks it or it couldn't be |
398 | If this call isn't available because your OS lacks it or it couldn't be |