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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.109 by root, Sun Jun 3 09:44:17 2007 UTC vs.
Revision 1.124 by root, Sat May 10 19:25:33 2008 UTC

… …
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 31 # AnyEvent integration (EV, Event, Glib, Tk, urxvt, pureperl...)
32 open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!"; 32 open my $fh, "<&=" . IO::AIO::poll_fileno or die "$!";
33 my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb }); 33 my $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { IO::AIO::poll_cb });
34
35 # EV integration
36 my $w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb;
34 37
35 # Event integration 38 # Event integration
36 Event->io (fd => IO::AIO::poll_fileno, 39 Event->io (fd => IO::AIO::poll_fileno,
37 poll => 'r', 40 poll => 'r',
38 cb => \&IO::AIO::poll_cb); 41 cb => \&IO::AIO::poll_cb);
… …
183 186
184=cut 187=cut
185 188
186package IO::AIO; 189package IO::AIO;
187 190
191use Carp ();
192
188no warnings; 193no warnings;
189use strict 'vars'; 194use strict 'vars';
190 195
191use base 'Exporter'; 196use base 'Exporter';
192 197
193BEGIN { 198BEGIN {
194 our $VERSION = '2.4'; 199 our $VERSION = '3.0';
195 200
196 our @AIO_REQ = qw(aio_sendfile aio_read aio_write aio_open aio_close aio_stat 201 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 202 aio_stat aio_lstat aio_unlink aio_rmdir aio_readdir
198 aio_readlink aio_fsync aio_fdatasync aio_readahead aio_rename aio_link 203 aio_scandir aio_symlink aio_readlink aio_sync aio_fsync
204 aio_fdatasync aio_pathsync aio_readahead
205 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 206 aio_nop aio_mknod aio_load aio_rmtree aio_mkdir aio_chown
200 aio_chown aio_chmod aio_utime); 207 aio_chmod aio_utime aio_truncate);
208
201 our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice aio_block)); 209 our @EXPORT = (@AIO_REQ, qw(aioreq_pri aioreq_nice));
202 our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush 210 our @EXPORT_OK = qw(poll_fileno poll_cb poll_wait flush
203 min_parallel max_parallel max_idle 211 min_parallel max_parallel max_idle
204 nreqs nready npending nthreads 212 nreqs nready npending nthreads
205 max_poll_time max_poll_reqs); 213 max_poll_time max_poll_reqs);
206 214
… …
311 319
312 320
313=item aio_close $fh, $callback->($status) 321=item aio_close $fh, $callback->($status)
314 322
315Asynchronously close a file and call the callback with the result 323Asynchronously close a file and call the callback with the result
316code. I<WARNING:> although accepted, you should not pass in a perl 324code.
317filehandle here, as perl will likely close the file descriptor another
318time when the filehandle is destroyed. Normally, you can safely call perls
319C<close> or just let filehandles go out of scope.
320 325
321This is supposed to be a bug in the API, so that might change. It's 326Unfortunately, you can't do this to perl. Perl I<insists> very strongly on
322therefore best to avoid this function. 327closing the file descriptor associated with the filehandle itself.
323 328
329Therefore, C<aio_close> will not close the filehandle - instead it will
330use dup2 to overwrite the file descriptor with the write-end of a pipe
331(the pipe fd will be created on demand and will be cached).
332
333Or in other words: the file descriptor will be closed, but it will not be
334free for reuse until the perl filehandle is closed.
335
336=cut
324 337
325=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) 338=item aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
326 339
327=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) 340=item aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval)
328 341
329Reads or writes C<$length> bytes from the specified C<$fh> and C<$offset> 342Reads or writes C<$length> bytes from the specified C<$fh> and C<$offset>
330into the scalar given by C<$data> and offset C<$dataoffset> and calls the 343into the scalar given by C<$data> and offset C<$dataoffset> and calls the
331callback without the actual number of bytes read (or -1 on error, just 344callback without the actual number of bytes read (or -1 on error, just
332like the syscall). 345like the syscall).
333 346
334If C<$offset> is undefined, then the current file offset will be used (and 347If C<$offset> is undefined, then the current file descriptor offset will
335updated), otherwise the file offset will not be changed by these calls. 348be used (and updated), otherwise the file descriptor offset will not be
349changed by these calls.
336 350
337If C<$length> is undefined in C<aio_write>, use the remaining length of C<$data>. 351If C<$length> is undefined in C<aio_write>, use the remaining length of C<$data>.
338 352
339If C<$dataoffset> is less than zero, it will be counted from the end of 353If C<$dataoffset> is less than zero, it will be counted from the end of
340C<$data>. 354C<$data>.
341 355
342The C<$data> scalar I<MUST NOT> be modified in any way while the request 356The C<$data> scalar I<MUST NOT> be modified in any way while the request
… …
443 aio_chown "path", 0, -1; 457 aio_chown "path", 0, -1;
444 # same as above: 458 # same as above:
445 aio_chown "path", 0, undef; 459 aio_chown "path", 0, undef;
446 460
447 461
462=item aio_truncate $fh_or_path, $offset, $callback->($status)
463
464Works like truncate(2) or ftruncate(2).
465
466
448=item aio_chmod $fh_or_path, $mode, $callback->($status) 467=item aio_chmod $fh_or_path, $mode, $callback->($status)
449 468
450Works like perl's C<chmod> function. 469Works like perl's C<chmod> function.
451 470
452 471
… …
521memory. Status is the same as with aio_read. 540memory. Status is the same as with aio_read.
522 541
523=cut 542=cut
524 543
525sub aio_load($$;$) { 544sub aio_load($$;$) {
526 aio_block {
527 my ($path, undef, $cb) = @_; 545 my ($path, undef, $cb) = @_;
528 my $data = \$_[1]; 546 my $data = \$_[1];
529 547
530 my $pri = aioreq_pri; 548 my $pri = aioreq_pri;
531 my $grp = aio_group $cb; 549 my $grp = aio_group $cb;
550
551 aioreq_pri $pri;
552 add $grp aio_open $path, O_RDONLY, 0, sub {
553 my $fh = shift
554 or return $grp->result (-1);
532 555
533 aioreq_pri $pri; 556 aioreq_pri $pri;
534 add $grp aio_open $path, O_RDONLY, 0, sub {
535 my $fh = shift
536 or return $grp->result (-1);
537
538 aioreq_pri $pri;
539 add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub { 557 add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub {
540 $grp->result ($_[0]); 558 $grp->result ($_[0]);
541 };
542 }; 559 };
543
544 $grp
545 } 560 };
561
562 $grp
546} 563}
547 564
548=item aio_copy $srcpath, $dstpath, $callback->($status) 565=item aio_copy $srcpath, $dstpath, $callback->($status)
549 566
550Try to copy the I<file> (directories not supported as either source or 567Try to copy the I<file> (directories not supported as either source or
… …
561errors are being ignored. 578errors are being ignored.
562 579
563=cut 580=cut
564 581
565sub aio_copy($$;$) { 582sub aio_copy($$;$) {
566 aio_block {
567 my ($src, $dst, $cb) = @_; 583 my ($src, $dst, $cb) = @_;
568 584
569 my $pri = aioreq_pri; 585 my $pri = aioreq_pri;
570 my $grp = aio_group $cb; 586 my $grp = aio_group $cb;
571 587
572 aioreq_pri $pri; 588 aioreq_pri $pri;
573 add $grp aio_open $src, O_RDONLY, 0, sub { 589 add $grp aio_open $src, O_RDONLY, 0, sub {
574 if (my $src_fh = $_[0]) { 590 if (my $src_fh = $_[0]) {
575 my @stat = stat $src_fh; 591 my @stat = stat $src_fh;
576 592
577 aioreq_pri $pri; 593 aioreq_pri $pri;
578 add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub { 594 add $grp aio_open $dst, O_CREAT | O_WRONLY | O_TRUNC, 0200, sub {
579 if (my $dst_fh = $_[0]) { 595 if (my $dst_fh = $_[0]) {
580 aioreq_pri $pri; 596 aioreq_pri $pri;
581 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { 597 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
582 if ($_[0] == $stat[7]) { 598 if ($_[0] == $stat[7]) {
583 $grp->result (0); 599 $grp->result (0);
584 close $src_fh; 600 close $src_fh;
585 601
586 # those should not normally block. should. should. 602 # those should not normally block. should. should.
587 utime $stat[8], $stat[9], $dst; 603 utime $stat[8], $stat[9], $dst;
588 chmod $stat[2] & 07777, $dst_fh; 604 chmod $stat[2] & 07777, $dst_fh;
589 chown $stat[4], $stat[5], $dst_fh; 605 chown $stat[4], $stat[5], $dst_fh;
606
607 aioreq_pri $pri;
590 close $dst_fh; 608 add $grp aio_close $dst_fh;
591 } else { 609 } else {
592 $grp->result (-1); 610 $grp->result (-1);
593 close $src_fh; 611 close $src_fh;
594 close $dst_fh; 612 close $dst_fh;
595 613
596 aioreq $pri; 614 aioreq $pri;
597 add $grp aio_unlink $dst; 615 add $grp aio_unlink $dst;
598 }
599 }; 616 }
600 } else {
601 $grp->result (-1);
602 } 617 };
618 } else {
619 $grp->result (-1);
603 }, 620 }
604
605 } else {
606 $grp->result (-1);
607 } 621 },
622
623 } else {
624 $grp->result (-1);
608 }; 625 }
609
610 $grp
611 } 626 };
627
628 $grp
612} 629}
613 630
614=item aio_move $srcpath, $dstpath, $callback->($status) 631=item aio_move $srcpath, $dstpath, $callback->($status)
615 632
616Try to move the I<file> (directories not supported as either source or 633Try to move the I<file> (directories not supported as either source or
… …
622that is successful, unlinking the C<$srcpath>. 639that is successful, unlinking the C<$srcpath>.
623 640
624=cut 641=cut
625 642
626sub aio_move($$;$) { 643sub aio_move($$;$) {
627 aio_block {
628 my ($src, $dst, $cb) = @_; 644 my ($src, $dst, $cb) = @_;
629 645
630 my $pri = aioreq_pri; 646 my $pri = aioreq_pri;
631 my $grp = aio_group $cb; 647 my $grp = aio_group $cb;
632 648
633 aioreq_pri $pri; 649 aioreq_pri $pri;
634 add $grp aio_rename $src, $dst, sub { 650 add $grp aio_rename $src, $dst, sub {
635 if ($_[0] && $! == EXDEV) { 651 if ($_[0] && $! == EXDEV) {
636 aioreq_pri $pri; 652 aioreq_pri $pri;
637 add $grp aio_copy $src, $dst, sub { 653 add $grp aio_copy $src, $dst, sub {
638 $grp->result ($_[0]);
639
640 if (!$_[0]) {
641 aioreq_pri $pri;
642 add $grp aio_unlink $src;
643 }
644 };
645 } else {
646 $grp->result ($_[0]); 654 $grp->result ($_[0]);
655
656 if (!$_[0]) {
657 aioreq_pri $pri;
658 add $grp aio_unlink $src;
659 }
647 } 660 };
661 } else {
662 $grp->result ($_[0]);
648 }; 663 }
649
650 $grp
651 } 664 };
665
666 $grp
652} 667}
653 668
654=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) 669=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
655 670
656Scans a directory (similar to C<aio_readdir>) but additionally tries to 671Scans a directory (similar to C<aio_readdir>) but additionally tries to
… …
704directory counting heuristic. 719directory counting heuristic.
705 720
706=cut 721=cut
707 722
708sub aio_scandir($$;$) { 723sub aio_scandir($$;$) {
709 aio_block {
710 my ($path, $maxreq, $cb) = @_; 724 my ($path, $maxreq, $cb) = @_;
711 725
712 my $pri = aioreq_pri; 726 my $pri = aioreq_pri;
713 727
714 my $grp = aio_group $cb; 728 my $grp = aio_group $cb;
715 729
716 $maxreq = 4 if $maxreq <= 0; 730 $maxreq = 4 if $maxreq <= 0;
717 731
718 # stat once 732 # stat once
733 aioreq_pri $pri;
734 add $grp aio_stat $path, sub {
735 return $grp->result () if $_[0];
736 my $now = time;
737 my $hash1 = join ":", (stat _)[0,1,3,7,9];
738
739 # read the directory entries
719 aioreq_pri $pri; 740 aioreq_pri $pri;
720 add $grp aio_stat $path, sub { 741 add $grp aio_readdir $path, sub {
742 my $entries = shift
721 return $grp->result () if $_[0]; 743 or return $grp->result ();
722 my $now = time;
723 my $hash1 = join ":", (stat _)[0,1,3,7,9];
724 744
725 # read the directory entries 745 # stat the dir another time
726 aioreq_pri $pri; 746 aioreq_pri $pri;
727 add $grp aio_readdir $path, sub {
728 my $entries = shift
729 or return $grp->result ();
730
731 # stat the dir another time
732 aioreq_pri $pri;
733 add $grp aio_stat $path, sub { 747 add $grp aio_stat $path, sub {
734 my $hash2 = join ":", (stat _)[0,1,3,7,9]; 748 my $hash2 = join ":", (stat _)[0,1,3,7,9];
735 749
736 my $ndirs; 750 my $ndirs;
737 751
738 # take the slow route if anything looks fishy 752 # take the slow route if anything looks fishy
739 if ($hash1 ne $hash2 or (stat _)[9] == $now) { 753 if ($hash1 ne $hash2 or (stat _)[9] == $now) {
740 $ndirs = -1; 754 $ndirs = -1;
741 } else { 755 } else {
742 # if nlink == 2, we are finished 756 # if nlink == 2, we are finished
743 # on non-posix-fs's, we rely on nlink < 2 757 # on non-posix-fs's, we rely on nlink < 2
744 $ndirs = (stat _)[3] - 2 758 $ndirs = (stat _)[3] - 2
745 or return $grp->result ([], $entries); 759 or return $grp->result ([], $entries);
746 } 760 }
747 761
748 # sort into likely dirs and likely nondirs 762 # sort into likely dirs and likely nondirs
749 # dirs == files without ".", short entries first 763 # dirs == files without ".", short entries first
750 $entries = [map $_->[0], 764 $entries = [map $_->[0],
751 sort { $b->[1] cmp $a->[1] } 765 sort { $b->[1] cmp $a->[1] }
752 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], 766 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
753 @$entries]; 767 @$entries];
754 768
755 my (@dirs, @nondirs); 769 my (@dirs, @nondirs);
756 770
757 my $statgrp = add $grp aio_group sub { 771 my $statgrp = add $grp aio_group sub {
758 $grp->result (\@dirs, \@nondirs); 772 $grp->result (\@dirs, \@nondirs);
759 }; 773 };
760 774
761 limit $statgrp $maxreq; 775 limit $statgrp $maxreq;
762 feed $statgrp sub { 776 feed $statgrp sub {
763 return unless @$entries; 777 return unless @$entries;
764 my $entry = pop @$entries; 778 my $entry = pop @$entries;
765 779
766 aioreq_pri $pri; 780 aioreq_pri $pri;
767 add $statgrp aio_stat "$path/$entry/.", sub { 781 add $statgrp aio_stat "$path/$entry/.", sub {
768 if ($_[0] < 0) { 782 if ($_[0] < 0) {
769 push @nondirs, $entry; 783 push @nondirs, $entry;
770 } else { 784 } else {
771 # need to check for real directory 785 # need to check for real directory
772 aioreq_pri $pri; 786 aioreq_pri $pri;
773 add $statgrp aio_lstat "$path/$entry", sub { 787 add $statgrp aio_lstat "$path/$entry", sub {
774 if (-d _) { 788 if (-d _) {
775 push @dirs, $entry; 789 push @dirs, $entry;
776 790
777 unless (--$ndirs) { 791 unless (--$ndirs) {
778 push @nondirs, @$entries; 792 push @nondirs, @$entries;
779 feed $statgrp; 793 feed $statgrp;
780 }
781 } else {
782 push @nondirs, $entry;
783 } 794 }
795 } else {
796 push @nondirs, $entry;
784 } 797 }
785 } 798 }
786 }; 799 }
787 }; 800 };
788 }; 801 };
789 }; 802 };
790 }; 803 };
791
792 $grp
793 } 804 };
805
806 $grp
794} 807}
795 808
796=item aio_rmtree $path, $callback->($status) 809=item aio_rmtree $path, $callback->($status)
797 810
798Delete a directory tree starting (and including) C<$path>, return the 811Delete a directory tree starting (and including) C<$path>, return the
… …
802 815
803=cut 816=cut
804 817
805sub aio_rmtree; 818sub aio_rmtree;
806sub aio_rmtree($;$) { 819sub aio_rmtree($;$) {
807 aio_block {
808 my ($path, $cb) = @_; 820 my ($path, $cb) = @_;
809 821
810 my $pri = aioreq_pri; 822 my $pri = aioreq_pri;
811 my $grp = aio_group $cb; 823 my $grp = aio_group $cb;
812 824
813 aioreq_pri $pri; 825 aioreq_pri $pri;
814 add $grp aio_scandir $path, 0, sub { 826 add $grp aio_scandir $path, 0, sub {
815 my ($dirs, $nondirs) = @_; 827 my ($dirs, $nondirs) = @_;
816 828
817 my $dirgrp = aio_group sub { 829 my $dirgrp = aio_group sub {
818 add $grp aio_rmdir $path, sub { 830 add $grp aio_rmdir $path, sub {
819 $grp->result ($_[0]); 831 $grp->result ($_[0]);
820 };
821 }; 832 };
822
823 (aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs;
824 (aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs;
825
826 add $grp $dirgrp;
827 }; 833 };
828 834
829 $grp 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;
830 } 839 };
840
841 $grp
831} 842}
843
844=item aio_sync $callback->($status)
845
846Asynchronously call sync and call the callback when finished.
832 847
833=item aio_fsync $fh, $callback->($status) 848=item aio_fsync $fh, $callback->($status)
834 849
835Asynchronously call fsync on the given filehandle and call the callback 850Asynchronously call fsync on the given filehandle and call the callback
836with the fsync result code. 851with the fsync result code.
… …
840Asynchronously call fdatasync on the given filehandle and call the 855Asynchronously call fdatasync on the given filehandle and call the
841callback with the fdatasync result code. 856callback with the fdatasync result code.
842 857
843If this call isn't available because your OS lacks it or it couldn't be 858If this call isn't available because your OS lacks it or it couldn't be
844detected, it will be emulated by calling C<fsync> instead. 859detected, it will be emulated by calling C<fsync> instead.
860
861=item aio_pathsync $path, $callback->($status)
862
863This request tries to open, fsync and close the given path. This is a
864composite request intended tosync directories after directory operations
865(E.g. rename). This might not work on all operating systems or have any
866specific effect, but usually it makes sure that directory changes get
867written to disc. It works for anything that can be opened for read-only,
868not just directories.
869
870Passes C<0> when everything went ok, and C<-1> on error.
871
872=cut
873
874sub aio_pathsync($;$) {
875 my ($path, $cb) = @_;
876
877 my $pri = aioreq_pri;
878 my $grp = aio_group $cb;
879
880 aioreq_pri $pri;
881 add $grp aio_open $path, O_RDONLY, 0, sub {
882 my ($fh) = @_;
883 if ($fh) {
884 aioreq_pri $pri;
885 add $grp aio_fsync $fh, sub {
886 $grp->result ($_[0]);
887
888 aioreq_pri $pri;
889 add $grp aio_close $fh;
890 };
891 } else {
892 $grp->result (-1);
893 }
894 };
895
896 $grp
897}
845 898
846=item aio_group $callback->(...) 899=item aio_group $callback->(...)
847 900
848This is a very special aio request: Instead of doing something, it is a 901This is a very special aio request: Instead of doing something, it is a
849container for other aio requests, which is useful if you want to bundle 902container for other aio requests, which is useful if you want to bundle
… …
986itself. Useful when you queued a lot of events but got a result early. 1039itself. Useful when you queued a lot of events but got a result early.
987 1040
988=item $grp->result (...) 1041=item $grp->result (...)
989 1042
990Set the result value(s) that will be passed to the group callback when all 1043Set the result value(s) that will be passed to the group callback when all
991subrequests have finished and set thre groups errno to the current value 1044subrequests have finished and set the groups errno to the current value
992of errno (just like calling C<errno> without an error number). By default, 1045of errno (just like calling C<errno> without an error number). By default,
993no argument will be passed and errno is zero. 1046no argument will be passed and errno is zero.
994 1047
995=item $grp->errno ([$errno]) 1048=item $grp->errno ([$errno])
996 1049
… …
1194 1247
1195The default is probably ok in most situations, especially if thread 1248The default is probably ok in most situations, especially if thread
1196creation is fast. If thread creation is very slow on your system you might 1249creation is fast. If thread creation is very slow on your system you might
1197want to use larger values. 1250want to use larger values.
1198 1251
1199=item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs 1252=item IO::AIO::max_outstanding $maxreqs
1200 1253
1201This is a very bad function to use in interactive programs because it 1254This is a very bad function to use in interactive programs because it
1202blocks, and a bad way to reduce concurrency because it is inexact: Better 1255blocks, and a bad way to reduce concurrency because it is inexact: Better
1203use an C<aio_group> together with a feed callback. 1256use an C<aio_group> together with a feed callback.
1204 1257
1205Sets the maximum number of outstanding requests to C<$nreqs>. If you 1258Sets the maximum number of outstanding requests to C<$nreqs>. If you
1206to queue up more than this number of requests, the next call to the 1259do queue up more than this number of requests, the next call to the
1207C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>) 1260C<poll_cb> (and C<poll_some> and other functions calling C<poll_cb>)
1208function will block until the limit is no longer exceeded. 1261function will block until the limit is no longer exceeded.
1209 1262
1210The default value is very large, so there is no practical limit on the 1263The default value is very large, so there is no practical limit on the
1211number of outstanding requests. 1264number of outstanding requests.
1212 1265
1213You can still queue as many requests as you want. Therefore, 1266You can still queue as many requests as you want. Therefore,
1214C<max_oustsanding> is mainly useful in simple scripts (with low values) or 1267C<max_outstanding> is mainly useful in simple scripts (with low values) or
1215as a stop gap to shield against fatal memory overflow (with large values). 1268as a stop gap to shield against fatal memory overflow (with large values).
1216 1269
1217=back 1270=back
1218 1271
1219=head3 STATISTICAL INFORMATION 1272=head3 STATISTICAL INFORMATION
… …
1241but not yet processed by poll_cb). 1294but not yet processed by poll_cb).
1242 1295
1243=back 1296=back
1244 1297
1245=cut 1298=cut
1246
1247# support function to convert a fd into a perl filehandle
1248sub _fd2fh {
1249 return undef if $_[0] < 0;
1250
1251 # try to generate nice filehandles
1252 my $sym = "IO::AIO::fd#$_[0]";
1253 local *$sym;
1254
1255 open *$sym, "+<&=$_[0]" # usually works under any unix
1256 or open *$sym, "<&=$_[0]" # cygwin needs this
1257 or open *$sym, ">&=$_[0]" # or this
1258 or return undef;
1259
1260 *$sym
1261}
1262 1299
1263min_parallel 8; 1300min_parallel 8;
1264 1301
1265END { flush } 1302END { flush }
1266 1303
… …
1290bytes of memory. In addition, stat requests need a stat buffer (possibly 1327bytes of memory. In addition, stat requests need a stat buffer (possibly
1291a few hundred bytes), readdir requires a result buffer and so on. Perl 1328a few hundred bytes), readdir requires a result buffer and so on. Perl
1292scalars and other data passed into aio requests will also be locked and 1329scalars and other data passed into aio requests will also be locked and
1293will consume memory till the request has entered the done state. 1330will consume memory till the request has entered the done state.
1294 1331
1295This is now awfully much, so queuing lots of requests is not usually a 1332This is not awfully much, so queuing lots of requests is not usually a
1296problem. 1333problem.
1297 1334
1298Per-thread usage: 1335Per-thread usage:
1299 1336
1300In the execution phase, some aio requests require more memory for 1337In the execution phase, some aio requests require more memory for

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