… | |
… | |
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 | |
19 | |
20 | # AnyEvent |
20 | # version 2+ has request and group objects |
|
|
21 | use IO::AIO 2; |
|
|
22 | |
|
|
23 | my $req = aio_unlink "/tmp/file", sub { }; |
|
|
24 | $req->cancel; # cancel request if still in queue |
|
|
25 | |
|
|
26 | my $grp = aio_group sub { print "all stats done\n" }; |
|
|
27 | add $grp aio_stat "..." for ...; |
|
|
28 | |
|
|
29 | # AnyEvent integration |
21 | open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!"; |
30 | open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!"; |
22 | my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb }); |
31 | my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb }); |
23 | |
32 | |
24 | # Event |
33 | # Event integration |
25 | Event->io (fd => IO::AIO::poll_fileno, |
34 | Event->io (fd => IO::AIO::poll_fileno, |
26 | poll => 'r', |
35 | poll => 'r', |
27 | cb => \&IO::AIO::poll_cb); |
36 | cb => \&IO::AIO::poll_cb); |
28 | |
37 | |
29 | # Glib/Gtk2 |
38 | # Glib/Gtk2 integration |
30 | add_watch Glib::IO IO::AIO::poll_fileno, |
39 | add_watch Glib::IO IO::AIO::poll_fileno, |
31 | in => sub { IO::AIO::poll_cb; 1 }; |
40 | in => sub { IO::AIO::poll_cb; 1 }; |
32 | |
41 | |
33 | # Tk |
42 | # Tk integration |
34 | Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "", |
43 | Tk::Event::IO->fileevent (IO::AIO::poll_fileno, "", |
35 | readable => \&IO::AIO::poll_cb); |
44 | readable => \&IO::AIO::poll_cb); |
36 | |
45 | |
37 | # Danga::Socket |
46 | # Danga::Socket integration |
38 | Danga::Socket->AddOtherFds (IO::AIO::poll_fileno => |
47 | Danga::Socket->AddOtherFds (IO::AIO::poll_fileno => |
39 | \&IO::AIO::poll_cb); |
48 | \&IO::AIO::poll_cb); |
40 | |
|
|
41 | |
49 | |
42 | =head1 DESCRIPTION |
50 | =head1 DESCRIPTION |
43 | |
51 | |
44 | This module implements asynchronous I/O using whatever means your |
52 | This module implements asynchronous I/O using whatever means your |
45 | operating system supports. |
53 | operating system supports. |
… | |
… | |
66 | use strict 'vars'; |
74 | use strict 'vars'; |
67 | |
75 | |
68 | use base 'Exporter'; |
76 | use base 'Exporter'; |
69 | |
77 | |
70 | BEGIN { |
78 | BEGIN { |
71 | our $VERSION = '1.8'; |
79 | our $VERSION = '2.0'; |
72 | |
80 | |
73 | our @EXPORT = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
81 | our @EXPORT = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
74 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
82 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
75 | aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move); |
83 | aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move |
|
|
84 | aio_group); |
76 | our @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs); |
85 | our @EXPORT_OK = qw(poll_fileno poll_cb min_parallel max_parallel max_outstanding nreqs); |
|
|
86 | |
|
|
87 | @IO::AIO::GRP::ISA = 'IO::AIO::REQ'; |
77 | |
88 | |
78 | require XSLoader; |
89 | require XSLoader; |
79 | XSLoader::load ("IO::AIO", $VERSION); |
90 | XSLoader::load ("IO::AIO", $VERSION); |
80 | } |
91 | } |
81 | |
92 | |
… | |
… | |
91 | perl, which usually delivers "false") as it's sole argument when the given |
102 | perl, which usually delivers "false") as it's sole argument when the given |
92 | syscall has been executed asynchronously. |
103 | syscall has been executed asynchronously. |
93 | |
104 | |
94 | All functions expecting a filehandle keep a copy of the filehandle |
105 | All functions expecting a filehandle keep a copy of the filehandle |
95 | internally until the request has finished. |
106 | internally until the request has finished. |
|
|
107 | |
|
|
108 | All requests return objects of type L<IO::AIO::REQ> that allow further |
|
|
109 | manipulation of those requests while they are in-flight. |
96 | |
110 | |
97 | The pathnames you pass to these routines I<must> be absolute and |
111 | The pathnames you pass to these routines I<must> be absolute and |
98 | encoded in byte form. The reason for the former is that at the time the |
112 | encoded in byte form. The reason for the former is that at the time the |
99 | request is being executed, the current working directory could have |
113 | request is being executed, the current working directory could have |
100 | changed. Alternatively, you can make sure that you never change the |
114 | changed. Alternatively, you can make sure that you never change the |
… | |
… | |
168 | print "read $_[0] bytes: <$buffer>\n"; |
182 | print "read $_[0] bytes: <$buffer>\n"; |
169 | }; |
183 | }; |
170 | |
184 | |
171 | =item aio_move $srcpath, $dstpath, $callback->($status) |
185 | =item aio_move $srcpath, $dstpath, $callback->($status) |
172 | |
186 | |
173 | [EXPERIMENTAL] |
|
|
174 | |
|
|
175 | Try to move the I<file> (directories not supported as either source or destination) |
187 | Try to move the I<file> (directories not supported as either source or |
176 | from C<$srcpath> to C<$dstpath> and call the callback with the C<0> (error) or C<-1> ok. |
188 | destination) from C<$srcpath> to C<$dstpath> and call the callback with |
|
|
189 | the C<0> (error) or C<-1> ok. |
177 | |
190 | |
178 | This is a composite request that tries to rename(2) the file first. If |
191 | This is a composite request that tries to rename(2) the file first. If |
179 | rename files with C<EXDEV>, it creates the destination file with mode 0200 |
192 | rename files with C<EXDEV>, it creates the destination file with mode 0200 |
180 | and copies the contents of the source file into it using C<aio_sendfile>, |
193 | and copies the contents of the source file into it using C<aio_sendfile>, |
181 | followed by restoring atime, mtime, access mode and uid/gid, in that |
194 | followed by restoring atime, mtime, access mode and uid/gid, in that |
… | |
… | |
188 | =cut |
201 | =cut |
189 | |
202 | |
190 | sub aio_move($$$) { |
203 | sub aio_move($$$) { |
191 | my ($src, $dst, $cb) = @_; |
204 | my ($src, $dst, $cb) = @_; |
192 | |
205 | |
|
|
206 | my $grp = aio_group; |
|
|
207 | |
193 | aio_rename $src, $dst, sub { |
208 | add $grp aio_rename $src, $dst, sub { |
194 | if ($_[0] && $! == EXDEV) { |
209 | if ($_[0] && $! == EXDEV) { |
195 | aio_open $src, O_RDONLY, 0, sub { |
210 | add $grp aio_open $src, O_RDONLY, 0, sub { |
196 | if (my $src_fh = $_[0]) { |
211 | if (my $src_fh = $_[0]) { |
197 | my @stat = stat $src_fh; |
212 | my @stat = stat $src_fh; |
198 | |
213 | |
199 | aio_open $dst, O_WRONLY, 0200, sub { |
214 | add $grp aio_open $dst, O_WRONLY, 0200, sub { |
200 | if (my $dst_fh = $_[0]) { |
215 | if (my $dst_fh = $_[0]) { |
201 | aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { |
216 | add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { |
202 | close $src_fh; |
217 | close $src_fh; |
203 | |
218 | |
204 | if ($_[0] == $stat[7]) { |
219 | if ($_[0] == $stat[7]) { |
205 | utime $stat[8], $stat[9], $dst; |
220 | utime $stat[8], $stat[9], $dst; |
206 | chmod $stat[2] & 07777, $dst_fh; |
221 | chmod $stat[2] & 07777, $dst_fh; |
207 | chown $stat[4], $stat[5], $dst_fh; |
222 | chown $stat[4], $stat[5], $dst_fh; |
208 | close $dst_fh; |
223 | close $dst_fh; |
209 | |
224 | |
210 | aio_unlink $src, sub { |
225 | add $grp aio_unlink $src, sub { |
211 | $cb->($_[0]); |
226 | $cb->($_[0]); |
212 | }; |
227 | }; |
213 | } else { |
228 | } else { |
214 | my $errno = $!; |
229 | my $errno = $!; |
215 | aio_unlink $dst, sub { |
230 | add $grp aio_unlink $dst, sub { |
216 | $! = $errno; |
231 | $! = $errno; |
217 | $cb->(-1); |
232 | $cb->(-1); |
218 | }; |
233 | }; |
219 | } |
234 | } |
220 | }; |
235 | }; |
… | |
… | |
229 | }; |
244 | }; |
230 | } else { |
245 | } else { |
231 | $cb->($_[0]); |
246 | $cb->($_[0]); |
232 | } |
247 | } |
233 | }; |
248 | }; |
|
|
249 | |
|
|
250 | $grp |
234 | } |
251 | } |
235 | |
252 | |
236 | =item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
253 | =item aio_sendfile $out_fh, $in_fh, $in_offset, $length, $callback->($retval) |
237 | |
254 | |
238 | Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
255 | Tries to copy C<$length> bytes from C<$in_fh> to C<$out_fh>. It starts |
… | |
… | |
326 | The callback a single argument which is either C<undef> or an array-ref |
343 | The callback a single argument which is either C<undef> or an array-ref |
327 | with the filenames. |
344 | with the filenames. |
328 | |
345 | |
329 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
346 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
330 | |
347 | |
331 | Scans a directory (similar to C<aio_readdir>) and tries to separate the |
348 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
332 | entries of directory C<$path> into two sets of names, ones you can recurse |
349 | separate the entries of directory C<$path> into two sets of names, ones |
333 | into (directories), and ones you cannot recurse into (everything else). |
350 | you can recurse into (directories or links to them), and ones you cannot |
|
|
351 | recurse into (everything else). |
334 | |
352 | |
335 | C<aio_scandir> is a composite request that consists of many |
353 | C<aio_scandir> is a composite request that consists of many sub |
336 | aio-primitives. C<$maxreq> specifies the maximum number of outstanding |
354 | requests. C<$maxreq> specifies the maximum number of outstanding aio |
337 | aio requests that this function generates. If it is C<< <= 0 >>, then a |
355 | requests that this function generates. If it is C<< <= 0 >>, then a |
338 | suitable default will be chosen (currently 8). |
356 | suitable default will be chosen (currently 8). |
339 | |
357 | |
340 | On error, the callback is called without arguments, otherwise it receives |
358 | On error, the callback is called without arguments, otherwise it receives |
341 | two array-refs with path-relative entry names. |
359 | two array-refs with path-relative entry names. |
342 | |
360 | |
… | |
… | |
351 | Implementation notes. |
369 | Implementation notes. |
352 | |
370 | |
353 | The C<aio_readdir> cannot be avoided, but C<stat()>'ing every entry can. |
371 | The C<aio_readdir> cannot be avoided, but C<stat()>'ing every entry can. |
354 | |
372 | |
355 | After reading the directory, the modification time, size etc. of the |
373 | After reading the directory, the modification time, size etc. of the |
356 | directory before and after the readdir is checked, and if they match, the |
374 | directory before and after the readdir is checked, and if they match (and |
357 | link count will be used to decide how many entries are directories (if |
375 | isn't the current time), the link count will be used to decide how many |
358 | >= 2). Otherwise, no knowledge of the number of subdirectories will be |
376 | entries are directories (if >= 2). Otherwise, no knowledge of the number |
359 | assumed. |
377 | of subdirectories will be assumed. |
360 | |
378 | |
361 | Then entires will be sorted into likely directories (everything without a |
379 | Then entries will be sorted into likely directories (everything without |
362 | non-initial dot) and likely non-directories (everything else). Then every |
380 | a non-initial dot currently) and likely non-directories (everything |
363 | entry + C</.> will be C<stat>'ed, likely directories first. This is often |
381 | else). Then every entry plus an appended C</.> will be C<stat>'ed, |
|
|
382 | likely directories first. If that succeeds, it assumes that the entry |
|
|
383 | is a directory or a symlink to directory (which will be checked |
|
|
384 | seperately). This is often faster than stat'ing the entry itself because |
364 | faster because filesystems might detect the type of the entry without |
385 | filesystems might detect the type of the entry without reading the inode |
365 | reading the inode data (e.g. ext2fs filetype feature). If that succeeds, |
386 | data (e.g. ext2fs filetype feature). |
366 | it assumes that the entry is a directory or a symlink to directory (which |
|
|
367 | will be checked seperately). |
|
|
368 | |
387 | |
369 | If the known number of directories has been reached, the rest of the |
388 | If the known number of directories (link count - 2) has been reached, the |
370 | entries is assumed to be non-directories. |
389 | rest of the entries is assumed to be non-directories. |
|
|
390 | |
|
|
391 | This only works with certainty on POSIX (= UNIX) filesystems, which |
|
|
392 | fortunately are the vast majority of filesystems around. |
|
|
393 | |
|
|
394 | It will also likely work on non-POSIX filesystems with reduced efficiency |
|
|
395 | as those tend to return 0 or 1 as link counts, which disables the |
|
|
396 | directory counting heuristic. |
371 | |
397 | |
372 | =cut |
398 | =cut |
373 | |
399 | |
374 | sub aio_scandir($$$) { |
400 | sub aio_scandir($$$) { |
375 | my ($path, $maxreq, $cb) = @_; |
401 | my ($path, $maxreq, $cb) = @_; |
376 | |
402 | |
|
|
403 | my $grp = aio_group; |
|
|
404 | |
377 | $maxreq = 8 if $maxreq <= 0; |
405 | $maxreq = 8 if $maxreq <= 0; |
378 | |
406 | |
379 | # stat once |
407 | # stat once |
380 | aio_stat $path, sub { |
408 | add $grp aio_stat $path, sub { |
381 | return $cb->() if $_[0]; |
409 | return $cb->() if $_[0]; |
|
|
410 | my $now = time; |
382 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
411 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
383 | |
412 | |
384 | # read the directory entries |
413 | # read the directory entries |
385 | aio_readdir $path, sub { |
414 | add $grp aio_readdir $path, sub { |
386 | my $entries = shift |
415 | my $entries = shift |
387 | or return $cb->(); |
416 | or return $cb->(); |
388 | |
417 | |
389 | # stat the dir another time |
418 | # stat the dir another time |
390 | aio_stat $path, sub { |
419 | add $grp aio_stat $path, sub { |
391 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
420 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
392 | |
421 | |
393 | my $ndirs; |
422 | my $ndirs; |
394 | |
423 | |
395 | # take the slow route if anything looks fishy |
424 | # take the slow route if anything looks fishy |
396 | if ($hash1 ne $hash2) { |
425 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
397 | $ndirs = -1; |
426 | $ndirs = -1; |
398 | } else { |
427 | } else { |
399 | # if nlink == 2, we are finished |
428 | # if nlink == 2, we are finished |
400 | # on non-posix-fs's, we rely on nlink < 2 |
429 | # on non-posix-fs's, we rely on nlink < 2 |
401 | $ndirs = (stat _)[3] - 2 |
430 | $ndirs = (stat _)[3] - 2 |
… | |
… | |
417 | $schedcb = sub { |
446 | $schedcb = sub { |
418 | if (@$entries) { |
447 | if (@$entries) { |
419 | if ($nreq < $maxreq) { |
448 | if ($nreq < $maxreq) { |
420 | my $ent = pop @$entries; |
449 | my $ent = pop @$entries; |
421 | $nreq++; |
450 | $nreq++; |
422 | aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) }; |
451 | add $grp aio_stat "$path/$ent/.", sub { $statcb->($_[0], $ent) }; |
423 | } |
452 | } |
424 | } elsif (!$nreq) { |
453 | } elsif (!$nreq) { |
425 | # finished |
454 | # finished |
426 | undef $statcb; |
455 | undef $statcb; |
427 | undef $schedcb; |
456 | undef $schedcb; |
… | |
… | |
436 | $nreq--; |
465 | $nreq--; |
437 | push @nondirs, $entry; |
466 | push @nondirs, $entry; |
438 | &$schedcb; |
467 | &$schedcb; |
439 | } else { |
468 | } else { |
440 | # need to check for real directory |
469 | # need to check for real directory |
441 | aio_lstat "$path/$entry", sub { |
470 | add $grp aio_lstat "$path/$entry", sub { |
442 | $nreq--; |
471 | $nreq--; |
443 | |
472 | |
444 | if (-d _) { |
473 | if (-d _) { |
445 | push @dirs, $entry; |
474 | push @dirs, $entry; |
446 | |
475 | |
… | |
… | |
459 | |
488 | |
460 | &$schedcb while @$entries && $nreq < $maxreq; |
489 | &$schedcb while @$entries && $nreq < $maxreq; |
461 | }; |
490 | }; |
462 | }; |
491 | }; |
463 | }; |
492 | }; |
|
|
493 | |
|
|
494 | $grp |
464 | } |
495 | } |
465 | |
496 | |
466 | =item aio_fsync $fh, $callback->($status) |
497 | =item aio_fsync $fh, $callback->($status) |
467 | |
498 | |
468 | Asynchronously call fsync on the given filehandle and call the callback |
499 | Asynchronously call fsync on the given filehandle and call the callback |
… | |
… | |
473 | Asynchronously call fdatasync on the given filehandle and call the |
504 | Asynchronously call fdatasync on the given filehandle and call the |
474 | callback with the fdatasync result code. |
505 | callback with the fdatasync result code. |
475 | |
506 | |
476 | If this call isn't available because your OS lacks it or it couldn't be |
507 | If this call isn't available because your OS lacks it or it couldn't be |
477 | detected, it will be emulated by calling C<fsync> instead. |
508 | detected, it will be emulated by calling C<fsync> instead. |
|
|
509 | |
|
|
510 | =item aio_group $callback->() |
|
|
511 | |
|
|
512 | [EXPERIMENTAL] |
|
|
513 | |
|
|
514 | This is a very special aio request: Instead of doing something, it is a |
|
|
515 | container for other aio requests, which is useful if you want to bundle |
|
|
516 | many requests into a single, composite, request. |
|
|
517 | |
|
|
518 | Returns an object of class L<IO::AIO::GRP>. See its documentation below |
|
|
519 | for more info. |
|
|
520 | |
|
|
521 | Example: |
|
|
522 | |
|
|
523 | my $grp = aio_group sub { |
|
|
524 | print "all stats done\n"; |
|
|
525 | }; |
|
|
526 | |
|
|
527 | add $grp |
|
|
528 | (aio_stat ...), |
|
|
529 | (aio_stat ...), |
|
|
530 | ...; |
|
|
531 | |
|
|
532 | =item IO::AIO::aio_sleep $fractional_seconds, $callback->() *NOT EXPORTED* |
|
|
533 | |
|
|
534 | Mainly used for debugging and benchmarking, this aio request puts one of |
|
|
535 | the request workers to sleep for the given time. |
|
|
536 | |
|
|
537 | While it is theoretically handy to have simple I/O scheduling requests |
|
|
538 | like sleep and file handle readable/writable, the overhead this creates |
|
|
539 | is immense, so do not use this function except to put your application |
|
|
540 | under artificial I/O pressure. |
|
|
541 | |
|
|
542 | =back |
|
|
543 | |
|
|
544 | =head2 IO::AIO::REQ CLASS |
|
|
545 | |
|
|
546 | All non-aggregate C<aio_*> functions return an object of this class when |
|
|
547 | called in non-void context. |
|
|
548 | |
|
|
549 | A request always moves through the following five states in its lifetime, |
|
|
550 | in order: B<ready> (request has been created, but has not been executed |
|
|
551 | yet), B<execute> (request is currently being executed), B<pending> |
|
|
552 | (request has been executed but callback has not been called yet), |
|
|
553 | B<result> (results are being processed synchronously, includes calling the |
|
|
554 | callback) and B<done> (request has reached the end of its lifetime and |
|
|
555 | holds no resources anymore). |
|
|
556 | |
|
|
557 | =over 4 |
|
|
558 | |
|
|
559 | =item $req->cancel |
|
|
560 | |
|
|
561 | Cancels the request, if possible. Has the effect of skipping execution |
|
|
562 | when entering the B<execute> state and skipping calling the callback when |
|
|
563 | entering the the B<result> state, but will leave the request otherwise |
|
|
564 | untouched. That means that requests that currently execute will not be |
|
|
565 | stopped and resources held by the request will not be freed prematurely. |
|
|
566 | |
|
|
567 | =back |
|
|
568 | |
|
|
569 | =head2 IO::AIO::GRP CLASS |
|
|
570 | |
|
|
571 | This class is a subclass of L<IO::AIO::REQ>, so all its methods apply to |
|
|
572 | objects of this class, too. |
|
|
573 | |
|
|
574 | A IO::AIO::GRP object is a special request that can contain multiple other |
|
|
575 | aio requests. |
|
|
576 | |
|
|
577 | You create one by calling the C<aio_group> constructing function with a |
|
|
578 | callback that will be called when all contained requests have entered the |
|
|
579 | C<done> state: |
|
|
580 | |
|
|
581 | my $grp = aio_group sub { |
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582 | print "all requests are done\n"; |
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583 | }; |
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584 | |
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585 | You add requests by calling the C<add> method with one or more |
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586 | C<IO::AIO::REQ> objects: |
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587 | |
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588 | $grp->add (aio_unlink "..."); |
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589 | |
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590 | add $grp aio_stat "...", sub { ... }; |
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591 | |
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592 | This makes it very easy to create composite requests (see the source of |
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593 | C<aio_move> for an application) that work and feel like simple requests. |
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594 | |
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595 | The IO::AIO::GRP objects will be cleaned up during calls to |
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596 | C<IO::AIO::poll_cb>, just like any other request. |
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597 | |
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598 | They can be canceled like any other request. Canceling will cancel not |
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599 | just the request itself, but also all requests it contains. |
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600 | |
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601 | They can also can also be added to other IO::AIO::GRP objects. |
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602 | |
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603 | Their lifetime, simplified, looks like this: when they are empty, they |
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604 | will finish very quickly. If they contain only requests that are in the |
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605 | C<done> state, they will also finish. Otherwise they will continue to |
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606 | exist. |
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607 | |
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608 | That means after creating a group you have some time to add requests. And |
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609 | in the callbacks of those requests, you can add further requests to the |
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610 | group. And only when all those requests have finished will the the group |
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611 | itself finish. |
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612 | |
|
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613 | =over 4 |
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614 | |
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|
615 | =item $grp->add (...) |
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616 | |
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|
617 | =item add $grp ... |
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618 | |
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619 | Add one or more requests to the group. Any type of L<IO::AIO::REQ> can |
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620 | be added, including other groups, as long as you do not create circular |
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621 | dependencies. |
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622 | |
|
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623 | Returns all its arguments. |
478 | |
624 | |
479 | =back |
625 | =back |
480 | |
626 | |
481 | =head2 SUPPORT FUNCTIONS |
627 | =head2 SUPPORT FUNCTIONS |
482 | |
628 | |
… | |
… | |
610 | } |
756 | } |
611 | |
757 | |
612 | 1; |
758 | 1; |
613 | |
759 | |
614 | =head2 FORK BEHAVIOUR |
760 | =head2 FORK BEHAVIOUR |
|
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761 | |
|
|
762 | This module should do "the right thing" when the process using it forks: |
615 | |
763 | |
616 | Before the fork, IO::AIO enters a quiescent state where no requests |
764 | Before the fork, IO::AIO enters a quiescent state where no requests |
617 | can be added in other threads and no results will be processed. After |
765 | can be added in other threads and no results will be processed. After |
618 | the fork the parent simply leaves the quiescent state and continues |
766 | the fork the parent simply leaves the quiescent state and continues |
619 | request/result processing, while the child clears the request/result |
767 | request/result processing, while the child clears the request/result |
620 | queue (so the requests started before the fork will only be handled in |
768 | queue (so the requests started before the fork will only be handled in |
621 | the parent). Threats will be started on demand until the limit ste in the |
769 | the parent). Threads will be started on demand until the limit ste in the |
622 | parent process has been reached again. |
770 | parent process has been reached again. |
623 | |
771 | |
|
|
772 | In short: the parent will, after a short pause, continue as if fork had |
|
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773 | not been called, while the child will act as if IO::AIO has not been used |
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|
774 | yet. |
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775 | |
624 | =head1 SEE ALSO |
776 | =head1 SEE ALSO |
625 | |
777 | |
626 | L<Coro>, L<Linux::AIO>. |
778 | L<Coro>, L<Linux::AIO> (obsolete). |
627 | |
779 | |
628 | =head1 AUTHOR |
780 | =head1 AUTHOR |
629 | |
781 | |
630 | Marc Lehmann <schmorp@schmorp.de> |
782 | Marc Lehmann <schmorp@schmorp.de> |
631 | http://home.schmorp.de/ |
783 | http://home.schmorp.de/ |