… | |
… | |
26 | $req->cancel; # cancel request if still in queue |
26 | $req->cancel; # cancel request if still in queue |
27 | |
27 | |
28 | my $grp = aio_group sub { print "all stats done\n" }; |
28 | my $grp = aio_group sub { print "all stats done\n" }; |
29 | add $grp aio_stat "..." for ...; |
29 | add $grp aio_stat "..." for ...; |
30 | |
30 | |
|
|
31 | # AnyEvent integration (EV, Event, Glib, Tk, POE, urxvt, pureperl...) |
|
|
32 | use AnyEvent::AIO; |
|
|
33 | |
31 | # AnyEvent integration |
34 | # EV integration |
32 | open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!"; |
35 | my $w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
33 | my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb }); |
|
|
34 | |
36 | |
35 | # Event integration |
37 | # Event integration |
36 | Event->io (fd => IO::AIO::poll_fileno, |
38 | Event->io (fd => IO::AIO::poll_fileno, |
37 | poll => 'r', |
39 | poll => 'r', |
38 | cb => \&IO::AIO::poll_cb); |
40 | cb => \&IO::AIO::poll_cb); |
… | |
… | |
183 | |
185 | |
184 | =cut |
186 | =cut |
185 | |
187 | |
186 | package IO::AIO; |
188 | package IO::AIO; |
187 | |
189 | |
|
|
190 | use Carp (); |
|
|
191 | |
188 | no warnings; |
192 | no warnings; |
189 | use strict 'vars'; |
193 | use strict 'vars'; |
190 | |
194 | |
191 | use base 'Exporter'; |
195 | use base 'Exporter'; |
192 | |
196 | |
193 | BEGIN { |
197 | BEGIN { |
194 | our $VERSION = '2.5'; |
198 | our $VERSION = '3.07'; |
195 | |
199 | |
196 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat |
200 | our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close |
197 | aio_lstat aio_unlink aio_rmdir aio_readdir aio_scandir aio_symlink |
201 | aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir |
198 | aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link |
202 | aio_scandir aio_symlink aio_readlink aio_sync aio_fsync |
|
|
203 | aio_fdatasync aio_pathsync aio_readahead |
|
|
204 | aio_rename aio_link aio_move aio_copy aio_group |
199 | aio_move aio_copy aio_group aio_nop aio_mknod aio_load aio_rmtree aio_mkdir |
205 | aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown |
200 | aio_chown aio_chmod aio_utime aio_truncate); |
206 | aio_chmod aio_utime aio_truncate); |
|
|
207 | |
201 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice aio_block)); |
208 | our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice)); |
202 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
209 | our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush |
203 | min_parallel max_parallel max_idle |
210 | min_parallel max_parallel max_idle |
204 | nreqs nready npending nthreads |
211 | nreqs nready npending nthreads |
205 | max_poll_time max_poll_reqs); |
212 | max_poll_time max_poll_reqs); |
206 | |
213 | |
… | |
… | |
313 | =item aio_close $fh, $callback->($status) |
320 | =item aio_close $fh, $callback->($status) |
314 | |
321 | |
315 | Asynchronously close a file and call the callback with the result |
322 | Asynchronously close a file and call the callback with the result |
316 | code. |
323 | code. |
317 | |
324 | |
318 | Unlike the other functions operating on files, this function uses the |
325 | Unfortunately, you can't do this to perl. Perl I<insists> very strongly on |
319 | PerlIO layer to close the filehandle. The reason is that the PerlIO API |
326 | closing the file descriptor associated with the filehandle itself. |
320 | insists on closing the underlying fd itself, no matter what, and doesn't |
|
|
321 | allow modifications to the fd. Unfortunately, it is not clear that you can |
|
|
322 | call PerlIO from different threads (actually, its quite clear that this |
|
|
323 | won't work in some cases), so while it likely works perfectly with simple |
|
|
324 | file handles (such as the ones created by C<aio_open>) it might fail in |
|
|
325 | interesting ways for others. |
|
|
326 | |
327 | |
327 | Having said that, aio_close tries to clean up the filehandle as much as |
328 | Therefore, C<aio_close> will not close the filehandle - instead it will |
328 | possible before handing it to an io thread, and generally does work. |
329 | use dup2 to overwrite the file descriptor with the write-end of a pipe |
|
|
330 | (the pipe fd will be created on demand and will be cached). |
329 | |
331 | |
|
|
332 | Or in other words: the file descriptor will be closed, but it will not be |
|
|
333 | free for reuse until the perl filehandle is closed. |
|
|
334 | |
|
|
335 | =cut |
330 | |
336 | |
331 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
337 | =item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
332 | |
338 | |
333 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
339 | =item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
334 | |
340 | |
… | |
… | |
533 | memory. Status is the same as with aio_read. |
539 | memory. Status is the same as with aio_read. |
534 | |
540 | |
535 | =cut |
541 | =cut |
536 | |
542 | |
537 | sub aio_load($$;$) { |
543 | sub aio_load($$;$) { |
538 | aio_block { |
|
|
539 | my ($path, undef, $cb) = @_; |
544 | my ($path, undef, $cb) = @_; |
540 | my $data = \$_[1]; |
545 | my $data = \$_[1]; |
541 | |
546 | |
542 | my $pri = aioreq_pri; |
547 | my $pri = aioreq_pri; |
543 | my $grp = aio_group $cb; |
548 | my $grp = aio_group $cb; |
|
|
549 | |
|
|
550 | aioreq_pri $pri; |
|
|
551 | add $grp aio_open $path, O_RDONLY, 0, sub { |
|
|
552 | my $fh = shift |
|
|
553 | or return $grp->result (-1); |
544 | |
554 | |
545 | aioreq_pri $pri; |
555 | aioreq_pri $pri; |
546 | add $grp aio_open $path, O_RDONLY, 0, sub { |
|
|
547 | my $fh = shift |
|
|
548 | or return $grp->result (-1); |
|
|
549 | |
|
|
550 | aioreq_pri $pri; |
|
|
551 | add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub { |
556 | add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub { |
552 | $grp->result ($_[0]); |
557 | $grp->result ($_[0]); |
553 | }; |
|
|
554 | }; |
558 | }; |
555 | |
|
|
556 | $grp |
|
|
557 | } |
559 | }; |
|
|
560 | |
|
|
561 | $grp |
558 | } |
562 | } |
559 | |
563 | |
560 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
564 | =item aio_copy $srcpath, $dstpath, $callback->($status) |
561 | |
565 | |
562 | Try to copy the I<file> (directories not supported as either source or |
566 | Try to copy the I<file> (directories not supported as either source or |
… | |
… | |
573 | errors are being ignored. |
577 | errors are being ignored. |
574 | |
578 | |
575 | =cut |
579 | =cut |
576 | |
580 | |
577 | sub aio_copy($$;$) { |
581 | sub aio_copy($$;$) { |
578 | aio_block { |
|
|
579 | my ($src, $dst, $cb) = @_; |
582 | my ($src, $dst, $cb) = @_; |
580 | |
583 | |
581 | my $pri = aioreq_pri; |
584 | my $pri = aioreq_pri; |
582 | my $grp = aio_group $cb; |
585 | my $grp = aio_group $cb; |
583 | |
586 | |
584 | aioreq_pri $pri; |
587 | aioreq_pri $pri; |
585 | add $grp aio_open $src, O_RDONLY, 0, sub { |
588 | add $grp aio_open $src, O_RDONLY, 0, sub { |
586 | if (my $src_fh = $_[0]) { |
589 | if (my $src_fh = $_[0]) { |
587 | my @stat = stat $src_fh; |
590 | my @stat = stat $src_fh; |
588 | |
591 | |
589 | aioreq_pri $pri; |
592 | aioreq_pri $pri; |
590 | add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub { |
593 | add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub { |
591 | if (my $dst_fh = $_[0]) { |
594 | if (my $dst_fh = $_[0]) { |
592 | aioreq_pri $pri; |
595 | aioreq_pri $pri; |
593 | add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { |
596 | add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { |
594 | if ($_[0] == $stat[7]) { |
597 | if ($_[0] == $stat[7]) { |
595 | $grp->result (0); |
598 | $grp->result (0); |
596 | close $src_fh; |
599 | close $src_fh; |
597 | |
600 | |
598 | # those should not normally block. should. should. |
601 | # those should not normally block. should. should. |
599 | utime $stat[8], $stat[9], $dst; |
602 | utime $stat[8], $stat[9], $dst; |
600 | chmod $stat[2] & 07777, $dst_fh; |
603 | chmod $stat[2] & 07777, $dst_fh; |
601 | chown $stat[4], $stat[5], $dst_fh; |
604 | chown $stat[4], $stat[5], $dst_fh; |
|
|
605 | |
|
|
606 | aioreq_pri $pri; |
602 | close $dst_fh; |
607 | add $grp aio_close $dst_fh; |
603 | } else { |
608 | } else { |
604 | $grp->result (-1); |
609 | $grp->result (-1); |
605 | close $src_fh; |
610 | close $src_fh; |
606 | close $dst_fh; |
611 | close $dst_fh; |
607 | |
612 | |
608 | aioreq $pri; |
613 | aioreq $pri; |
609 | add $grp aio_unlink $dst; |
614 | add $grp aio_unlink $dst; |
610 | } |
|
|
611 | }; |
615 | } |
612 | } else { |
|
|
613 | $grp->result (-1); |
|
|
614 | } |
616 | }; |
|
|
617 | } else { |
|
|
618 | $grp->result (-1); |
615 | }, |
619 | } |
616 | |
|
|
617 | } else { |
|
|
618 | $grp->result (-1); |
|
|
619 | } |
620 | }, |
|
|
621 | |
|
|
622 | } else { |
|
|
623 | $grp->result (-1); |
620 | }; |
624 | } |
621 | |
|
|
622 | $grp |
|
|
623 | } |
625 | }; |
|
|
626 | |
|
|
627 | $grp |
624 | } |
628 | } |
625 | |
629 | |
626 | =item aio_move $srcpath, $dstpath, $callback->($status) |
630 | =item aio_move $srcpath, $dstpath, $callback->($status) |
627 | |
631 | |
628 | Try to move the I<file> (directories not supported as either source or |
632 | Try to move the I<file> (directories not supported as either source or |
… | |
… | |
634 | that is successful, unlinking the C<$srcpath>. |
638 | that is successful, unlinking the C<$srcpath>. |
635 | |
639 | |
636 | =cut |
640 | =cut |
637 | |
641 | |
638 | sub aio_move($$;$) { |
642 | sub aio_move($$;$) { |
639 | aio_block { |
|
|
640 | my ($src, $dst, $cb) = @_; |
643 | my ($src, $dst, $cb) = @_; |
641 | |
644 | |
642 | my $pri = aioreq_pri; |
645 | my $pri = aioreq_pri; |
643 | my $grp = aio_group $cb; |
646 | my $grp = aio_group $cb; |
644 | |
647 | |
645 | aioreq_pri $pri; |
648 | aioreq_pri $pri; |
646 | add $grp aio_rename $src, $dst, sub { |
649 | add $grp aio_rename $src, $dst, sub { |
647 | if ($_[0] && $! == EXDEV) { |
650 | if ($_[0] && $! == EXDEV) { |
648 | aioreq_pri $pri; |
651 | aioreq_pri $pri; |
649 | add $grp aio_copy $src, $dst, sub { |
652 | add $grp aio_copy $src, $dst, sub { |
650 | $grp->result ($_[0]); |
|
|
651 | |
|
|
652 | if (!$_[0]) { |
|
|
653 | aioreq_pri $pri; |
|
|
654 | add $grp aio_unlink $src; |
|
|
655 | } |
|
|
656 | }; |
|
|
657 | } else { |
|
|
658 | $grp->result ($_[0]); |
653 | $grp->result ($_[0]); |
|
|
654 | |
|
|
655 | if (!$_[0]) { |
|
|
656 | aioreq_pri $pri; |
|
|
657 | add $grp aio_unlink $src; |
|
|
658 | } |
659 | } |
659 | }; |
|
|
660 | } else { |
|
|
661 | $grp->result ($_[0]); |
660 | }; |
662 | } |
661 | |
|
|
662 | $grp |
|
|
663 | } |
663 | }; |
|
|
664 | |
|
|
665 | $grp |
664 | } |
666 | } |
665 | |
667 | |
666 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
668 | =item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) |
667 | |
669 | |
668 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
670 | Scans a directory (similar to C<aio_readdir>) but additionally tries to |
… | |
… | |
716 | directory counting heuristic. |
718 | directory counting heuristic. |
717 | |
719 | |
718 | =cut |
720 | =cut |
719 | |
721 | |
720 | sub aio_scandir($$;$) { |
722 | sub aio_scandir($$;$) { |
721 | aio_block { |
|
|
722 | my ($path, $maxreq, $cb) = @_; |
723 | my ($path, $maxreq, $cb) = @_; |
723 | |
724 | |
724 | my $pri = aioreq_pri; |
725 | my $pri = aioreq_pri; |
725 | |
726 | |
726 | my $grp = aio_group $cb; |
727 | my $grp = aio_group $cb; |
727 | |
728 | |
728 | $maxreq = 4 if $maxreq <= 0; |
729 | $maxreq = 4 if $maxreq <= 0; |
729 | |
730 | |
730 | # stat once |
731 | # stat once |
|
|
732 | aioreq_pri $pri; |
|
|
733 | add $grp aio_stat $path, sub { |
|
|
734 | return $grp->result () if $_[0]; |
|
|
735 | my $now = time; |
|
|
736 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
737 | |
|
|
738 | # read the directory entries |
731 | aioreq_pri $pri; |
739 | aioreq_pri $pri; |
732 | add $grp aio_stat $path, sub { |
740 | add $grp aio_readdir $path, sub { |
|
|
741 | my $entries = shift |
733 | return $grp->result () if $_[0]; |
742 | or return $grp->result (); |
734 | my $now = time; |
|
|
735 | my $hash1 = join ":", (stat _)[0,1,3,7,9]; |
|
|
736 | |
743 | |
737 | # read the directory entries |
744 | # stat the dir another time |
738 | aioreq_pri $pri; |
745 | aioreq_pri $pri; |
739 | add $grp aio_readdir $path, sub { |
|
|
740 | my $entries = shift |
|
|
741 | or return $grp->result (); |
|
|
742 | |
|
|
743 | # stat the dir another time |
|
|
744 | aioreq_pri $pri; |
|
|
745 | add $grp aio_stat $path, sub { |
746 | add $grp aio_stat $path, sub { |
746 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
747 | my $hash2 = join ":", (stat _)[0,1,3,7,9]; |
747 | |
748 | |
748 | my $ndirs; |
749 | my $ndirs; |
749 | |
750 | |
750 | # take the slow route if anything looks fishy |
751 | # take the slow route if anything looks fishy |
751 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
752 | if ($hash1 ne $hash2 or (stat _)[9] == $now) { |
752 | $ndirs = -1; |
753 | $ndirs = -1; |
753 | } else { |
754 | } else { |
754 | # if nlink == 2, we are finished |
755 | # if nlink == 2, we are finished |
755 | # on non-posix-fs's, we rely on nlink < 2 |
756 | # on non-posix-fs's, we rely on nlink < 2 |
756 | $ndirs = (stat _)[3] - 2 |
757 | $ndirs = (stat _)[3] - 2 |
757 | or return $grp->result ([], $entries); |
758 | or return $grp->result ([], $entries); |
758 | } |
759 | } |
759 | |
760 | |
760 | # sort into likely dirs and likely nondirs |
761 | # sort into likely dirs and likely nondirs |
761 | # dirs == files without ".", short entries first |
762 | # dirs == files without ".", short entries first |
762 | $entries = [map $_->[0], |
763 | $entries = [map $_->[0], |
763 | sort { $b->[1] cmp $a->[1] } |
764 | sort { $b->[1] cmp $a->[1] } |
764 | map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], |
765 | map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], |
765 | @$entries]; |
766 | @$entries]; |
766 | |
767 | |
767 | my (@dirs, @nondirs); |
768 | my (@dirs, @nondirs); |
768 | |
769 | |
769 | my $statgrp = add $grp aio_group sub { |
770 | my $statgrp = add $grp aio_group sub { |
770 | $grp->result (\@dirs, \@nondirs); |
771 | $grp->result (\@dirs, \@nondirs); |
771 | }; |
772 | }; |
772 | |
773 | |
773 | limit $statgrp $maxreq; |
774 | limit $statgrp $maxreq; |
774 | feed $statgrp sub { |
775 | feed $statgrp sub { |
775 | return unless @$entries; |
776 | return unless @$entries; |
776 | my $entry = pop @$entries; |
777 | my $entry = pop @$entries; |
777 | |
778 | |
778 | aioreq_pri $pri; |
779 | aioreq_pri $pri; |
779 | add $statgrp aio_stat "$path/$entry/.", sub { |
780 | add $statgrp aio_stat "$path/$entry/.", sub { |
780 | if ($_[0] < 0) { |
781 | if ($_[0] < 0) { |
781 | push @nondirs, $entry; |
782 | push @nondirs, $entry; |
782 | } else { |
783 | } else { |
783 | # need to check for real directory |
784 | # need to check for real directory |
784 | aioreq_pri $pri; |
785 | aioreq_pri $pri; |
785 | add $statgrp aio_lstat "$path/$entry", sub { |
786 | add $statgrp aio_lstat "$path/$entry", sub { |
786 | if (-d _) { |
787 | if (-d _) { |
787 | push @dirs, $entry; |
788 | push @dirs, $entry; |
788 | |
789 | |
789 | unless (--$ndirs) { |
790 | unless (--$ndirs) { |
790 | push @nondirs, @$entries; |
791 | push @nondirs, @$entries; |
791 | feed $statgrp; |
792 | feed $statgrp; |
792 | } |
|
|
793 | } else { |
|
|
794 | push @nondirs, $entry; |
|
|
795 | } |
793 | } |
|
|
794 | } else { |
|
|
795 | push @nondirs, $entry; |
796 | } |
796 | } |
797 | } |
797 | } |
798 | }; |
798 | } |
799 | }; |
799 | }; |
800 | }; |
800 | }; |
801 | }; |
801 | }; |
802 | }; |
802 | }; |
803 | |
|
|
804 | $grp |
|
|
805 | } |
803 | }; |
|
|
804 | |
|
|
805 | $grp |
806 | } |
806 | } |
807 | |
807 | |
808 | =item aio_rmtree $path, $callback->($status) |
808 | =item aio_rmtree $path, $callback->($status) |
809 | |
809 | |
810 | Delete a directory tree starting (and including) C<$path>, return the |
810 | Delete a directory tree starting (and including) C<$path>, return the |
… | |
… | |
814 | |
814 | |
815 | =cut |
815 | =cut |
816 | |
816 | |
817 | sub aio_rmtree; |
817 | sub aio_rmtree; |
818 | sub aio_rmtree($;$) { |
818 | sub aio_rmtree($;$) { |
819 | aio_block { |
|
|
820 | my ($path, $cb) = @_; |
819 | my ($path, $cb) = @_; |
821 | |
820 | |
822 | my $pri = aioreq_pri; |
821 | my $pri = aioreq_pri; |
823 | my $grp = aio_group $cb; |
822 | my $grp = aio_group $cb; |
824 | |
823 | |
825 | aioreq_pri $pri; |
824 | aioreq_pri $pri; |
826 | add $grp aio_scandir $path, 0, sub { |
825 | add $grp aio_scandir $path, 0, sub { |
827 | my ($dirs, $nondirs) = @_; |
826 | my ($dirs, $nondirs) = @_; |
828 | |
827 | |
829 | my $dirgrp = aio_group sub { |
828 | my $dirgrp = aio_group sub { |
830 | add $grp aio_rmdir $path, sub { |
829 | add $grp aio_rmdir $path, sub { |
831 | $grp->result ($_[0]); |
830 | $grp->result ($_[0]); |
832 | }; |
|
|
833 | }; |
831 | }; |
834 | |
|
|
835 | (aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs; |
|
|
836 | (aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs; |
|
|
837 | |
|
|
838 | add $grp $dirgrp; |
|
|
839 | }; |
832 | }; |
840 | |
833 | |
841 | $grp |
834 | (aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs; |
|
|
835 | (aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs; |
|
|
836 | |
|
|
837 | add $grp $dirgrp; |
842 | } |
838 | }; |
|
|
839 | |
|
|
840 | $grp |
843 | } |
841 | } |
|
|
842 | |
|
|
843 | =item aio_sync $callback->($status) |
|
|
844 | |
|
|
845 | Asynchronously call sync and call the callback when finished. |
844 | |
846 | |
845 | =item aio_fsync $fh, $callback->($status) |
847 | =item aio_fsync $fh, $callback->($status) |
846 | |
848 | |
847 | Asynchronously call fsync on the given filehandle and call the callback |
849 | Asynchronously call fsync on the given filehandle and call the callback |
848 | with the fsync result code. |
850 | with the fsync result code. |
… | |
… | |
852 | Asynchronously call fdatasync on the given filehandle and call the |
854 | Asynchronously call fdatasync on the given filehandle and call the |
853 | callback with the fdatasync result code. |
855 | callback with the fdatasync result code. |
854 | |
856 | |
855 | If this call isn't available because your OS lacks it or it couldn't be |
857 | If this call isn't available because your OS lacks it or it couldn't be |
856 | detected, it will be emulated by calling C<fsync> instead. |
858 | detected, it will be emulated by calling C<fsync> instead. |
|
|
859 | |
|
|
860 | =item aio_pathsync $path, $callback->($status) |
|
|
861 | |
|
|
862 | This request tries to open, fsync and close the given path. This is a |
|
|
863 | composite request intended tosync directories after directory operations |
|
|
864 | (E.g. rename). This might not work on all operating systems or have any |
|
|
865 | specific effect, but usually it makes sure that directory changes get |
|
|
866 | written to disc. It works for anything that can be opened for read-only, |
|
|
867 | not just directories. |
|
|
868 | |
|
|
869 | Passes C<0> when everything went ok, and C<-1> on error. |
|
|
870 | |
|
|
871 | =cut |
|
|
872 | |
|
|
873 | sub aio_pathsync($;$) { |
|
|
874 | my ($path, $cb) = @_; |
|
|
875 | |
|
|
876 | my $pri = aioreq_pri; |
|
|
877 | my $grp = aio_group $cb; |
|
|
878 | |
|
|
879 | aioreq_pri $pri; |
|
|
880 | add $grp aio_open $path, O_RDONLY, 0, sub { |
|
|
881 | my ($fh) = @_; |
|
|
882 | if ($fh) { |
|
|
883 | aioreq_pri $pri; |
|
|
884 | add $grp aio_fsync $fh, sub { |
|
|
885 | $grp->result ($_[0]); |
|
|
886 | |
|
|
887 | aioreq_pri $pri; |
|
|
888 | add $grp aio_close $fh; |
|
|
889 | }; |
|
|
890 | } else { |
|
|
891 | $grp->result (-1); |
|
|
892 | } |
|
|
893 | }; |
|
|
894 | |
|
|
895 | $grp |
|
|
896 | } |
857 | |
897 | |
858 | =item aio_group $callback->(...) |
898 | =item aio_group $callback->(...) |
859 | |
899 | |
860 | This is a very special aio request: Instead of doing something, it is a |
900 | This is a very special aio request: Instead of doing something, it is a |
861 | container for other aio requests, which is useful if you want to bundle |
901 | container for other aio requests, which is useful if you want to bundle |
… | |
… | |
973 | Their lifetime, simplified, looks like this: when they are empty, they |
1013 | Their lifetime, simplified, looks like this: when they are empty, they |
974 | will finish very quickly. If they contain only requests that are in the |
1014 | will finish very quickly. If they contain only requests that are in the |
975 | C<done> state, they will also finish. Otherwise they will continue to |
1015 | C<done> state, they will also finish. Otherwise they will continue to |
976 | exist. |
1016 | exist. |
977 | |
1017 | |
978 | That means after creating a group you have some time to add requests. And |
1018 | That means after creating a group you have some time to add requests |
979 | in the callbacks of those requests, you can add further requests to the |
1019 | (precisely before the callback has been invoked, which is only done within |
980 | group. And only when all those requests have finished will the the group |
1020 | the C<poll_cb>). And in the callbacks of those requests, you can add |
981 | itself finish. |
1021 | further requests to the group. And only when all those requests have |
|
|
1022 | finished will the the group itself finish. |
982 | |
1023 | |
983 | =over 4 |
1024 | =over 4 |
984 | |
1025 | |
985 | =item add $grp ... |
1026 | =item add $grp ... |
986 | |
1027 | |
… | |
… | |
998 | itself. Useful when you queued a lot of events but got a result early. |
1039 | itself. Useful when you queued a lot of events but got a result early. |
999 | |
1040 | |
1000 | =item $grp->result (...) |
1041 | =item $grp->result (...) |
1001 | |
1042 | |
1002 | Set the result value(s) that will be passed to the group callback when all |
1043 | Set the result value(s) that will be passed to the group callback when all |
1003 | subrequests have finished and set thre groups errno to the current value |
1044 | subrequests have finished and set the groups errno to the current value |
1004 | of errno (just like calling C<errno> without an error number). By default, |
1045 | of errno (just like calling C<errno> without an error number). By default, |
1005 | no argument will be passed and errno is zero. |
1046 | no argument will be passed and errno is zero. |
1006 | |
1047 | |
1007 | =item $grp->errno ([$errno]) |
1048 | =item $grp->errno ([$errno]) |
1008 | |
1049 | |
… | |
… | |
1077 | See C<poll_cb> for an example. |
1118 | See C<poll_cb> for an example. |
1078 | |
1119 | |
1079 | =item IO::AIO::poll_cb |
1120 | =item IO::AIO::poll_cb |
1080 | |
1121 | |
1081 | Process some outstanding events on the result pipe. You have to call this |
1122 | Process some outstanding events on the result pipe. You have to call this |
1082 | regularly. Returns the number of events processed. Returns immediately |
1123 | regularly. Returns C<0> if all events could be processed, or C<-1> if it |
|
|
1124 | returned earlier for whatever reason. Returns immediately when no events |
1083 | when no events are outstanding. The amount of events processed depends on |
1125 | are outstanding. The amount of events processed depends on the settings of |
1084 | the settings of C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>. |
1126 | C<IO::AIO::max_poll_req> and C<IO::AIO::max_poll_time>. |
1085 | |
1127 | |
1086 | If not all requests were processed for whatever reason, the filehandle |
1128 | If not all requests were processed for whatever reason, the filehandle |
1087 | will still be ready when C<poll_cb> returns. |
1129 | will still be ready when C<poll_cb> returns, so normally you don't have to |
|
|
1130 | do anything special to have it called later. |
1088 | |
1131 | |
1089 | Example: Install an Event watcher that automatically calls |
1132 | Example: Install an Event watcher that automatically calls |
1090 | IO::AIO::poll_cb with high priority: |
1133 | IO::AIO::poll_cb with high priority: |
1091 | |
1134 | |
1092 | Event->io (fd => IO::AIO::poll_fileno, |
1135 | Event->io (fd => IO::AIO::poll_fileno, |
… | |
… | |
1206 | |
1249 | |
1207 | The default is probably ok in most situations, especially if thread |
1250 | The default is probably ok in most situations, especially if thread |
1208 | creation is fast. If thread creation is very slow on your system you might |
1251 | creation is fast. If thread creation is very slow on your system you might |
1209 | want to use larger values. |
1252 | want to use larger values. |
1210 | |
1253 | |
1211 | =item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs |
1254 | =item IO::AIO::max_outstanding $maxreqs |
1212 | |
1255 | |
1213 | This is a very bad function to use in interactive programs because it |
1256 | This is a very bad function to use in interactive programs because it |
1214 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1257 | blocks, and a bad way to reduce concurrency because it is inexact: Better |
1215 | use an C<aio_group> together with a feed callback. |
1258 | use an C<aio_group> together with a feed callback. |
1216 | |
1259 | |
… | |
… | |
1221 | |
1264 | |
1222 | The default value is very large, so there is no practical limit on the |
1265 | The default value is very large, so there is no practical limit on the |
1223 | number of outstanding requests. |
1266 | number of outstanding requests. |
1224 | |
1267 | |
1225 | You can still queue as many requests as you want. Therefore, |
1268 | You can still queue as many requests as you want. Therefore, |
1226 | C<max_oustsanding> is mainly useful in simple scripts (with low values) or |
1269 | C<max_outstanding> is mainly useful in simple scripts (with low values) or |
1227 | as a stop gap to shield against fatal memory overflow (with large values). |
1270 | as a stop gap to shield against fatal memory overflow (with large values). |
1228 | |
1271 | |
1229 | =back |
1272 | =back |
1230 | |
1273 | |
1231 | =head3 STATISTICAL INFORMATION |
1274 | =head3 STATISTICAL INFORMATION |
… | |
… | |
1301 | |
1344 | |
1302 | Known bugs will be fixed in the next release. |
1345 | Known bugs will be fixed in the next release. |
1303 | |
1346 | |
1304 | =head1 SEE ALSO |
1347 | =head1 SEE ALSO |
1305 | |
1348 | |
1306 | L<Coro::AIO>. |
1349 | L<AnyEvent::AIO> for easy integration into event loops, L<Coro::AIO> for a |
|
|
1350 | more natural syntax. |
1307 | |
1351 | |
1308 | =head1 AUTHOR |
1352 | =head1 AUTHOR |
1309 | |
1353 | |
1310 | Marc Lehmann <schmorp@schmorp.de> |
1354 | Marc Lehmann <schmorp@schmorp.de> |
1311 | http://home.schmorp.de/ |
1355 | http://home.schmorp.de/ |