… | |
… | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use IO::AIO; |
7 | use IO::AIO; |
8 | |
8 | |
9 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
9 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
10 | my ($fh) = @_; |
10 | my $fh = shift |
|
|
11 | or die "/etc/passwd: $!"; |
11 | ... |
12 | ... |
12 | }; |
13 | }; |
13 | |
14 | |
14 | aio_unlink "/tmp/file", sub { }; |
15 | aio_unlink "/tmp/file", sub { }; |
15 | |
16 | |
… | |
… | |
61 | etc.), but can also be used to easily do operations in parallel that are |
62 | etc.), but can also be used to easily do operations in parallel that are |
62 | normally done sequentially, e.g. stat'ing many files, which is much faster |
63 | normally done sequentially, e.g. stat'ing many files, which is much faster |
63 | on a RAID volume or over NFS when you do a number of stat operations |
64 | on a RAID volume or over NFS when you do a number of stat operations |
64 | concurrently. |
65 | concurrently. |
65 | |
66 | |
66 | While this works on all types of file descriptors (for example sockets), |
67 | While most of this works on all types of file descriptors (for example |
67 | using these functions on file descriptors that support nonblocking |
68 | sockets), using these functions on file descriptors that support |
68 | operation (again, sockets, pipes etc.) is very inefficient. Use an event |
69 | nonblocking operation (again, sockets, pipes etc.) is very inefficient or |
|
|
70 | might not work (aio_read fails on sockets/pipes/fifos). Use an event loop |
69 | loop for that (such as the L<Event|Event> module): IO::AIO will naturally |
71 | for that (such as the L<Event|Event> module): IO::AIO will naturally fit |
70 | fit into such an event loop itself. |
72 | into such an event loop itself. |
71 | |
73 | |
72 | In this version, a number of threads are started that execute your |
74 | In this version, a number of threads are started that execute your |
73 | requests and signal their completion. You don't need thread support |
75 | requests and signal their completion. You don't need thread support |
74 | in perl, and the threads created by this module will not be visible |
76 | in perl, and the threads created by this module will not be visible |
75 | to perl. In the future, this module might make use of the native aio |
77 | to perl. In the future, this module might make use of the native aio |
… | |
… | |
98 | poll => 'r', |
100 | poll => 'r', |
99 | cb => \&IO::AIO::poll_cb); |
101 | cb => \&IO::AIO::poll_cb); |
100 | |
102 | |
101 | # queue the request to open /etc/passwd |
103 | # queue the request to open /etc/passwd |
102 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
104 | aio_open "/etc/passwd", O_RDONLY, 0, sub { |
103 | my $fh = $_[0] |
105 | my $fh = shift |
104 | or die "error while opening: $!"; |
106 | or die "error while opening: $!"; |
105 | |
107 | |
106 | # stat'ing filehandles is generally non-blocking |
108 | # stat'ing filehandles is generally non-blocking |
107 | my $size = -s $fh; |
109 | my $size = -s $fh; |
108 | |
110 | |
… | |
… | |
176 | Request has reached the end of its lifetime and holds no resources anymore |
178 | Request has reached the end of its lifetime and holds no resources anymore |
177 | (except possibly for the Perl object, but its connection to the actual |
179 | (except possibly for the Perl object, but its connection to the actual |
178 | aio request is severed and calling its methods will either do nothing or |
180 | aio request is severed and calling its methods will either do nothing or |
179 | result in a runtime error). |
181 | result in a runtime error). |
180 | |
182 | |
|
|
183 | =back |
|
|
184 | |
181 | =cut |
185 | =cut |
182 | |
186 | |
183 | package IO::AIO; |
187 | package IO::AIO; |
184 | |
188 | |
185 | no warnings; |
189 | no warnings; |
186 | use strict 'vars'; |
190 | use strict 'vars'; |
187 | |
191 | |
188 | use base 'Exporter'; |
192 | use base 'Exporter'; |
189 | |
193 | |
190 | BEGIN { |
194 | BEGIN { |
191 | our $VERSION = '2.1'; |
195 | our $VERSION = '2.3'; |
192 | |
196 | |
193 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
197 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
194 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
198 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
195 | aio_fsync aio_fdatasync aio_readahead aio_rename aio_link aio_move |
199 | aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link |
196 | aio_copy aio_group aio_nop aio_mknod); |
200 | aio_move aio_copy aio_group aio_nop aio_mknod); |
197 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
201 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice aio_block)); |
198 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
202 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
199 | min_parallel max_parallel max_idle |
203 | min_parallel max_parallel max_idle |
200 | nreqs nready npending nthreads |
204 | nreqs nready npending nthreads |
201 | max_poll_time max_poll_reqs); |
205 | max_poll_time max_poll_reqs); |
202 | |
206 | |
… | |
… | |
206 | XSLoader::load ("IO::AIO", $VERSION); |
210 | XSLoader::load ("IO::AIO", $VERSION); |
207 | } |
211 | } |
208 | |
212 | |
209 | =head1 FUNCTIONS |
213 | =head1 FUNCTIONS |
210 | |
214 | |
211 | =head2 AIO FUNCTIONS |
215 | =head2 AIO REQUEST FUNCTIONS |
212 | |
216 | |
213 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
217 | All the C<aio_*> calls are more or less thin wrappers around the syscall |
214 | with the same name (sans C<aio_>). The arguments are similar or identical, |
218 | with the same name (sans C<aio_>). The arguments are similar or identical, |
215 | and they all accept an additional (and optional) C<$callback> argument |
219 | and they all accept an additional (and optional) C<$callback> argument |
216 | which must be a code reference. This code reference will get called with |
220 | which must be a code reference. This code reference will get called with |
… | |
… | |
219 | syscall has been executed asynchronously. |
223 | syscall has been executed asynchronously. |
220 | |
224 | |
221 | All functions expecting a filehandle keep a copy of the filehandle |
225 | All functions expecting a filehandle keep a copy of the filehandle |
222 | internally until the request has finished. |
226 | internally until the request has finished. |
223 | |
227 | |
224 | All requests return objects of type L<IO::AIO::REQ> that allow further |
228 | All functions return request objects of type L<IO::AIO::REQ> that allow |
225 | manipulation of those requests while they are in-flight. |
229 | further manipulation of those requests while they are in-flight. |
226 | |
230 | |
227 | The pathnames you pass to these routines I<must> be absolute and |
231 | The pathnames you pass to these routines I<must> be absolute and |
228 | encoded in byte form. The reason for the former is that at the time the |
232 | encoded as octets. The reason for the former is that at the time the |
229 | request is being executed, the current working directory could have |
233 | request is being executed, the current working directory could have |
230 | changed. Alternatively, you can make sure that you never change the |
234 | changed. Alternatively, you can make sure that you never change the |
231 | current working directory. |
235 | current working directory anywhere in the program and then use relative |
|
|
236 | paths. |
232 | |
237 | |
233 | To encode pathnames to byte form, either make sure you either: a) |
238 | To encode pathnames as octets, either make sure you either: a) always pass |
234 | always pass in filenames you got from outside (command line, readdir |
239 | in filenames you got from outside (command line, readdir etc.) without |
235 | etc.), b) are ASCII or ISO 8859-1, c) use the Encode module and encode |
240 | tinkering, b) are ASCII or ISO 8859-1, c) use the Encode module and encode |
236 | your pathnames to the locale (or other) encoding in effect in the user |
241 | your pathnames to the locale (or other) encoding in effect in the user |
237 | environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
242 | environment, d) use Glib::filename_from_unicode on unicode filenames or e) |
238 | use something else. |
243 | use something else to ensure your scalar has the correct contents. |
|
|
244 | |
|
|
245 | This works, btw. independent of the internal UTF-8 bit, which IO::AIO |
|
|
246 | handles correctly wether it is set or not. |
239 | |
247 | |
240 | =over 4 |
248 | =over 4 |
241 | |
249 | |
242 | =item $prev_pri = aioreq_pri [$pri] |
250 | =item $prev_pri = aioreq_pri [$pri] |
243 | |
251 | |
… | |
… | |
266 | }; |
274 | }; |
267 | |
275 | |
268 | =item aioreq_nice $pri_adjust |
276 | =item aioreq_nice $pri_adjust |
269 | |
277 | |
270 | Similar to C<aioreq_pri>, but subtracts the given value from the current |
278 | Similar to C<aioreq_pri>, but subtracts the given value from the current |
271 | priority, so effects are cumulative. |
279 | priority, so the effect is cumulative. |
272 | |
280 | |
273 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
281 | =item aio_open $pathname, $flags, $mode, $callback->($fh) |
274 | |
282 | |
275 | Asynchronously open or create a file and call the callback with a newly |
283 | Asynchronously open or create a file and call the callback with a newly |
276 | created filehandle for the file. |
284 | created filehandle for the file. |
… | |
… | |
411 | =item aio_symlink $srcpath, $dstpath, $callback->($status) |
419 | =item aio_symlink $srcpath, $dstpath, $callback->($status) |
412 | |
420 | |
413 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
421 | Asynchronously create a new symbolic link to the existing object at C<$srcpath> at |
414 | the path C<$dstpath> and call the callback with the result code. |
422 | the path C<$dstpath> and call the callback with the result code. |
415 | |
423 | |
|
|
424 | =item aio_readlink $path, $callback->($link) |
|
|
425 | |
|
|
426 | Asynchronously read the symlink specified by C<$path> and pass it to |
|
|
427 | the callback. If an error occurs, nothing or undef gets passed to the |
|
|
428 | callback. |
|
|
429 | |
416 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
430 | =item aio_rename $srcpath, $dstpath, $callback->($status) |
417 | |
431 | |
418 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
432 | Asynchronously rename the object at C<$srcpath> to C<$dstpath>, just as |
419 | rename(2) and call the callback with the result code. |
433 | rename(2) and call the callback with the result code. |
420 | |
434 | |
… | |
… | |
448 | errors are being ignored. |
462 | errors are being ignored. |
449 | |
463 | |
450 | =cut |
464 | =cut |
451 | |
465 | |
452 | sub aio_copy($$;$) { |
466 | sub aio_copy($$;$) { |
|
|
467 | aio_block { |
453 | my ($src, $dst, $cb) = @_; |
468 | my ($src, $dst, $cb) = @_; |
454 | |
469 | |
455 | my $pri = aioreq_pri; |
470 | my $pri = aioreq_pri; |
456 | my $grp = aio_group $cb; |
471 | my $grp = aio_group $cb; |
457 | |
472 | |
458 | aioreq_pri $pri; |
473 | aioreq_pri $pri; |
459 | add $grp aio_open $src, O_RDONLY, 0, sub { |
474 | add $grp aio_open $src, O_RDONLY, 0, sub { |
460 | if (my $src_fh = $_[0]) { |
475 | if (my $src_fh = $_[0]) { |
461 | my @stat = stat $src_fh; |
476 | my @stat = stat $src_fh; |
462 | |
477 | |
463 | aioreq_pri $pri; |
478 | aioreq_pri $pri; |
464 | add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub { |
479 | add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub { |
465 | if (my $dst_fh = $_[0]) { |
480 | if (my $dst_fh = $_[0]) { |
466 | aioreq_pri $pri; |
481 | aioreq_pri $pri; |
467 | add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { |
482 | add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { |
468 | if ($_[0] == $stat[7]) { |
483 | if ($_[0] == $stat[7]) { |
469 | $grp->result (0); |
484 | $grp->result (0); |
470 | close $src_fh; |
485 | close $src_fh; |
471 | |
486 | |
472 | # those should not normally block. should. should. |
487 | # those should not normally block. should. should. |
473 | utime $stat[8], $stat[9], $dst; |
488 | utime $stat[8], $stat[9], $dst; |
474 | chmod $stat[2] & 07777, $dst_fh; |
489 | chmod $stat[2] & 07777, $dst_fh; |
475 | chown $stat[4], $stat[5], $dst_fh; |
490 | chown $stat[4], $stat[5], $dst_fh; |
476 | close $dst_fh; |
491 | close $dst_fh; |
477 | } else { |
492 | } else { |
478 | $grp->result (-1); |
493 | $grp->result (-1); |
479 | close $src_fh; |
494 | close $src_fh; |
480 | close $dst_fh; |
495 | close $dst_fh; |
481 | |
496 | |
482 | aioreq $pri; |
497 | aioreq $pri; |
483 | add $grp aio_unlink $dst; |
498 | add $grp aio_unlink $dst; |
|
|
499 | } |
484 | } |
500 | }; |
|
|
501 | } else { |
|
|
502 | $grp->result (-1); |
485 | }; |
503 | } |
486 | } else { |
|
|
487 | $grp->result (-1); |
|
|
488 | } |
504 | }, |
|
|
505 | |
|
|
506 | } else { |
|
|
507 | $grp->result (-1); |
489 | }, |
508 | } |
490 | |
|
|
491 | } else { |
|
|
492 | $grp->result (-1); |
|
|
493 | } |
509 | }; |
|
|
510 | |
|
|
511 | $grp |
494 | }; |
512 | } |
495 | |
|
|
496 | $grp |
|
|
497 | } |
513 | } |
498 | |
514 | |
499 | =item aio_move $srcpath, $dstpath, $callback->($status) |
515 | =item aio_move $srcpath, $dstpath, $callback->($status) |
500 | |
516 | |
501 | Try to move the I<file> (directories not supported as either source or |
517 | Try to move the I<file> (directories not supported as either source or |
… | |
… | |
507 | that is successful, unlinking the C<$srcpath>. |
523 | that is successful, unlinking the C<$srcpath>. |
508 | |
524 | |
509 | =cut |
525 | =cut |
510 | |
526 | |
511 | sub aio_move($$;$) { |
527 | sub aio_move($$;$) { |
|
|
528 | aio_block { |
512 | my ($src, $dst, $cb) = @_; |
529 | my ($src, $dst, $cb) = @_; |
513 | |
530 | |
514 | my $pri = aioreq_pri; |
531 | my $pri = aioreq_pri; |
515 | my $grp = aio_group $cb; |
532 | my $grp = aio_group $cb; |
516 | |
533 | |
517 | aioreq_pri $pri; |
534 | aioreq_pri $pri; |
518 | add $grp aio_rename $src, $dst, sub { |
535 | add $grp aio_rename $src, $dst, sub { |
519 | if ($_[0] && $! == EXDEV) { |
536 | if ($_[0] && $! == EXDEV) { |
520 | aioreq_pri $pri; |
537 | aioreq_pri $pri; |
521 | add $grp aio_copy $src, $dst, sub { |
538 | add $grp aio_copy $src, $dst, sub { |
|
|
539 | $grp->result ($_[0]); |
|
|
540 | |
|
|
541 | if (!$_[0]) { |
|
|
542 | aioreq_pri $pri; |
|
|
543 | add $grp aio_unlink $src; |
|
|
544 | } |
|
|
545 | }; |
|
|
546 | } else { |
522 | $grp->result ($_[0]); |
547 | $grp->result ($_[0]); |
523 | |
|
|
524 | if (!$_[0]) { |
|
|
525 | aioreq_pri $pri; |
|
|
526 | add $grp aio_unlink $src; |
|
|
527 | } |
|
|
528 | }; |
548 | } |
529 | } else { |
|
|
530 | $grp->result ($_[0]); |
|
|
531 | } |
549 | }; |
|
|
550 | |
|
|
551 | $grp |
532 | }; |
552 | } |
533 | |
|
|
534 | $grp |
|
|
535 | } |
553 | } |
536 | |
554 | |
537 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
555 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
538 | |
556 | |
539 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
557 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
… | |
… | |
587 | directory counting heuristic. |
605 | directory counting heuristic. |
588 | |
606 | |
589 | =cut |
607 | =cut |
590 | |
608 | |
591 | sub aio_scandir($$$) { |
609 | sub aio_scandir($$$) { |
|
|
610 | aio_block { |
592 | my ($path, $maxreq, $cb) = @_; |
611 | my ($path, $maxreq, $cb) = @_; |
593 | |
612 | |
594 | my $pri = aioreq_pri; |
613 | my $pri = aioreq_pri; |
595 | |
614 | |
596 | my $grp = aio_group $cb; |
615 | my $grp = aio_group $cb; |
597 | |
616 | |
598 | $maxreq = 4 if $maxreq <= 0; |
617 | $maxreq = 4 if $maxreq <= 0; |
599 | |
618 | |
600 | # stat once |
619 | # stat once |
601 | aioreq_pri $pri; |
|
|
602 | add $grp aio_stat $path, sub { |
|
|
603 | return $grp->result () if $_[0]; |
|
|
604 | my $now = time; |
|
|
605 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
606 | |
|
|
607 | # read the directory entries |
|
|
608 | aioreq_pri $pri; |
620 | aioreq_pri $pri; |
609 | add $grp aio_readdir $path, sub { |
621 | add $grp aio_stat $path, sub { |
610 | my $entries = shift |
|
|
611 | or return $grp->result (); |
622 | return $grp->result () if $_[0]; |
|
|
623 | my $now = time; |
|
|
624 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
612 | |
625 | |
613 | # stat the dir another time |
626 | # read the directory entries |
614 | aioreq_pri $pri; |
627 | aioreq_pri $pri; |
|
|
628 | add $grp aio_readdir $path, sub { |
|
|
629 | my $entries = shift |
|
|
630 | or return $grp->result (); |
|
|
631 | |
|
|
632 | # stat the dir another time |
|
|
633 | aioreq_pri $pri; |
615 | add $grp aio_stat $path, sub { |
634 | add $grp aio_stat $path, sub { |
616 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
635 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
617 | |
636 | |
618 | my $ndirs; |
637 | my $ndirs; |
619 | |
638 | |
620 | # take the slow route if anything looks fishy |
639 | # take the slow route if anything looks fishy |
621 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
640 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
622 | $ndirs = -1; |
641 | $ndirs = -1; |
623 | } else { |
642 | } else { |
624 | # if nlink == 2, we are finished |
643 | # if nlink == 2, we are finished |
625 | # on non-posix-fs's, we rely on nlink < 2 |
644 | # on non-posix-fs's, we rely on nlink < 2 |
626 | $ndirs = (stat _)[3] - 2 |
645 | $ndirs = (stat _)[3] - 2 |
627 | or return $grp->result ([], $entries); |
646 | or return $grp->result ([], $entries); |
628 | } |
647 | } |
629 | |
648 | |
630 | # sort into likely dirs and likely nondirs |
649 | # sort into likely dirs and likely nondirs |
631 | # dirs == files without ".", short entries first |
650 | # dirs == files without ".", short entries first |
632 | $entries = [map $_->[0], |
651 | $entries = [map $_->[0], |
633 | sort { $b->[1] cmp $a->[1] } |
652 | sort { $b->[1] cmp $a->[1] } |
634 | map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], |
653 | map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], |
635 | @$entries]; |
654 | @$entries]; |
636 | |
655 | |
637 | my (@dirs, @nondirs); |
656 | my (@dirs, @nondirs); |
638 | |
657 | |
639 | my $statgrp = add $grp aio_group sub { |
658 | my $statgrp = add $grp aio_group sub { |
640 | $grp->result (\@dirs, \@nondirs); |
659 | $grp->result (\@dirs, \@nondirs); |
641 | }; |
660 | }; |
642 | |
661 | |
643 | limit $statgrp $maxreq; |
662 | limit $statgrp $maxreq; |
644 | feed $statgrp sub { |
663 | feed $statgrp sub { |
645 | return unless @$entries; |
664 | return unless @$entries; |
646 | my $entry = pop @$entries; |
665 | my $entry = pop @$entries; |
647 | |
666 | |
648 | aioreq_pri $pri; |
667 | aioreq_pri $pri; |
649 | add $statgrp aio_stat "$path/$entry/.", sub { |
668 | add $statgrp aio_stat "$path/$entry/.", sub { |
650 | if ($_[0] < 0) { |
669 | if ($_[0] < 0) { |
651 | push @nondirs, $entry; |
670 | push @nondirs, $entry; |
652 | } else { |
671 | } else { |
653 | # need to check for real directory |
672 | # need to check for real directory |
654 | aioreq_pri $pri; |
673 | aioreq_pri $pri; |
655 | add $statgrp aio_lstat "$path/$entry", sub { |
674 | add $statgrp aio_lstat "$path/$entry", sub { |
656 | if (-d _) { |
675 | if (-d _) { |
657 | push @dirs, $entry; |
676 | push @dirs, $entry; |
658 | |
677 | |
659 | unless (--$ndirs) { |
678 | unless (--$ndirs) { |
660 | push @nondirs, @$entries; |
679 | push @nondirs, @$entries; |
661 | feed $statgrp; |
680 | feed $statgrp; |
|
|
681 | } |
|
|
682 | } else { |
|
|
683 | push @nondirs, $entry; |
662 | } |
684 | } |
663 | } else { |
|
|
664 | push @nondirs, $entry; |
|
|
665 | } |
685 | } |
666 | } |
686 | } |
667 | } |
687 | }; |
668 | }; |
688 | }; |
669 | }; |
689 | }; |
670 | }; |
690 | }; |
671 | }; |
691 | }; |
|
|
692 | |
|
|
693 | $grp |
672 | }; |
694 | } |
673 | |
|
|
674 | $grp |
|
|
675 | } |
695 | } |
676 | |
696 | |
677 | =item aio_fsync $fh, $callback->($status) |
697 | =item aio_fsync $fh, $callback->($status) |
678 | |
698 | |
679 | Asynchronously call fsync on the given filehandle and call the callback |
699 | Asynchronously call fsync on the given filehandle and call the callback |
… | |
… | |
933 | that are being processed by C<IO::AIO::poll_cb> in one call, respectively |
953 | that are being processed by C<IO::AIO::poll_cb> in one call, respectively |
934 | the maximum amount of time (default C<0>, meaning infinity) spent in |
954 | the maximum amount of time (default C<0>, meaning infinity) spent in |
935 | C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount |
955 | C<IO::AIO::poll_cb> to process requests (more correctly the mininum amount |
936 | of time C<poll_cb> is allowed to use). |
956 | of time C<poll_cb> is allowed to use). |
937 | |
957 | |
|
|
958 | Setting C<max_poll_time> to a non-zero value creates an overhead of one |
|
|
959 | syscall per request processed, which is not normally a problem unless your |
|
|
960 | callbacks are really really fast or your OS is really really slow (I am |
|
|
961 | not mentioning Solaris here). Using C<max_poll_reqs> incurs no overhead. |
|
|
962 | |
938 | Setting these is useful if you want to ensure some level of |
963 | Setting these is useful if you want to ensure some level of |
939 | interactiveness when perl is not fast enough to process all requests in |
964 | interactiveness when perl is not fast enough to process all requests in |
940 | time. |
965 | time. |
941 | |
966 | |
942 | For interactive programs, values such as C<0.01> to C<0.1> should be fine. |
967 | For interactive programs, values such as C<0.01> to C<0.1> should be fine. |
943 | |
968 | |
944 | Example: Install an Event watcher that automatically calls |
969 | Example: Install an Event watcher that automatically calls |
945 | IO::AIO::poll_some with low priority, to ensure that other parts of the |
970 | IO::AIO::poll_cb with low priority, to ensure that other parts of the |
946 | program get the CPU sometimes even under high AIO load. |
971 | program get the CPU sometimes even under high AIO load. |
947 | |
972 | |
948 | # try not to spend much more than 0.1s in poll_cb |
973 | # try not to spend much more than 0.1s in poll_cb |
949 | IO::AIO::max_poll_time 0.1; |
974 | IO::AIO::max_poll_time 0.1; |
950 | |
975 | |
… | |
… | |
953 | poll => 'r', nice => 1, |
978 | poll => 'r', nice => 1, |
954 | cb => &IO::AIO::poll_cb); |
979 | cb => &IO::AIO::poll_cb); |
955 | |
980 | |
956 | =item IO::AIO::poll_wait |
981 | =item IO::AIO::poll_wait |
957 | |
982 | |
|
|
983 | If there are any outstanding requests and none of them in the result |
958 | Wait till the result filehandle becomes ready for reading (simply does a |
984 | phase, wait till the result filehandle becomes ready for reading (simply |
959 | C<select> on the filehandle. This is useful if you want to synchronously |
985 | does a C<select> on the filehandle. This is useful if you want to |
960 | wait for some requests to finish). |
986 | synchronously wait for some requests to finish). |
961 | |
987 | |
962 | See C<nreqs> for an example. |
988 | See C<nreqs> for an example. |
963 | |
989 | |
964 | =item IO::AIO::poll |
990 | =item IO::AIO::poll |
965 | |
991 | |
966 | Waits until some requests have been handled. |
992 | Waits until some requests have been handled. |
967 | |
993 | |
|
|
994 | Returns the number of requests processed, but is otherwise strictly |
968 | Strictly equivalent to: |
995 | equivalent to: |
969 | |
996 | |
970 | IO::AIO::poll_wait, IO::AIO::poll_cb |
997 | IO::AIO::poll_wait, IO::AIO::poll_cb |
971 | if IO::AIO::nreqs; |
|
|
972 | |
998 | |
973 | =item IO::AIO::flush |
999 | =item IO::AIO::flush |
974 | |
1000 | |
975 | Wait till all outstanding AIO requests have been handled. |
1001 | Wait till all outstanding AIO requests have been handled. |
976 | |
1002 | |
… | |
… | |
1090 | *$sym |
1116 | *$sym |
1091 | } |
1117 | } |
1092 | |
1118 | |
1093 | min_parallel 8; |
1119 | min_parallel 8; |
1094 | |
1120 | |
1095 | END { |
1121 | END { flush } |
1096 | min_parallel 1; |
|
|
1097 | flush; |
|
|
1098 | }; |
|
|
1099 | |
1122 | |
1100 | 1; |
1123 | 1; |
1101 | |
1124 | |
1102 | =head2 FORK BEHAVIOUR |
1125 | =head2 FORK BEHAVIOUR |
1103 | |
1126 | |