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Comparing IO-AIO/AIO.pm (file contents):
Revision 1.108 by root, Fri Jun 1 13:25:50 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<$dataoffset> and calls the
331callback without the actual number of bytes read (or -1 on error, just 344callback without the actual number of bytes read (or -1 on error, just
345like the syscall).
346
332like the syscall). If C<offset> is undefined, then the current file offset 347If C<$offset> is undefined, then the current file descriptor offset will
333will be used (and updated), otherwise the file offset will not be changed 348be used (and updated), otherwise the file descriptor offset will not be
334by these calls. 349changed by these calls.
350
351If C<$length> is undefined in C<aio_write>, use the remaining length of C<$data>.
352
353If C<$dataoffset> is less than zero, it will be counted from the end of
354C<$data>.
335 355
336The 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
337is outstanding. Modifying it can result in segfaults or World War III (if 357is outstanding. Modifying it can result in segfaults or World War III (if
338the necessary/optional hardware is installed). 358the necessary/optional hardware is installed).
339 359
… …
437 aio_chown "path", 0, -1; 457 aio_chown "path", 0, -1;
438 # same as above: 458 # same as above:
439 aio_chown "path", 0, undef; 459 aio_chown "path", 0, undef;
440 460
441 461
462=item aio_truncate $fh_or_path, $offset, $callback->($status)
463
464Works like truncate(2) or ftruncate(2).
465
466
442=item aio_chmod $fh_or_path, $mode, $callback->($status) 467=item aio_chmod $fh_or_path, $mode, $callback->($status)
443 468
444Works like perl's C<chmod> function. 469Works like perl's C<chmod> function.
445 470
446 471
… …
515memory. Status is the same as with aio_read. 540memory. Status is the same as with aio_read.
516 541
517=cut 542=cut
518 543
519sub aio_load($$;$) { 544sub aio_load($$;$) {
520 aio_block {
521 my ($path, undef, $cb) = @_; 545 my ($path, undef, $cb) = @_;
522 my $data = \$_[1]; 546 my $data = \$_[1];
523 547
524 my $pri = aioreq_pri; 548 my $pri = aioreq_pri;
525 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);
526 555
527 aioreq_pri $pri; 556 aioreq_pri $pri;
528 add $grp aio_open $path, O_RDONLY, 0, sub {
529 my $fh = shift
530 or return $grp->result (-1);
531
532 aioreq_pri $pri;
533 add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub { 557 add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub {
534 $grp->result ($_[0]); 558 $grp->result ($_[0]);
535 };
536 }; 559 };
537
538 $grp
539 } 560 };
561
562 $grp
540} 563}
541 564
542=item aio_copy $srcpath, $dstpath, $callback->($status) 565=item aio_copy $srcpath, $dstpath, $callback->($status)
543 566
544Try 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
… …
555errors are being ignored. 578errors are being ignored.
556 579
557=cut 580=cut
558 581
559sub aio_copy($$;$) { 582sub aio_copy($$;$) {
560 aio_block {
561 my ($src, $dst, $cb) = @_; 583 my ($src, $dst, $cb) = @_;
562 584
563 my $pri = aioreq_pri; 585 my $pri = aioreq_pri;
564 my $grp = aio_group $cb; 586 my $grp = aio_group $cb;
565 587
566 aioreq_pri $pri; 588 aioreq_pri $pri;
567 add $grp aio_open $src, O_RDONLY, 0, sub { 589 add $grp aio_open $src, O_RDONLY, 0, sub {
568 if (my $src_fh = $_[0]) { 590 if (my $src_fh = $_[0]) {
569 my @stat = stat $src_fh; 591 my @stat = stat $src_fh;
570 592
571 aioreq_pri $pri; 593 aioreq_pri $pri;
572 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 {
573 if (my $dst_fh = $_[0]) { 595 if (my $dst_fh = $_[0]) {
574 aioreq_pri $pri; 596 aioreq_pri $pri;
575 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { 597 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
576 if ($_[0] == $stat[7]) { 598 if ($_[0] == $stat[7]) {
577 $grp->result (0); 599 $grp->result (0);
578 close $src_fh; 600 close $src_fh;
579 601
580 # those should not normally block. should. should. 602 # those should not normally block. should. should.
581 utime $stat[8], $stat[9], $dst; 603 utime $stat[8], $stat[9], $dst;
582 chmod $stat[2] & 07777, $dst_fh; 604 chmod $stat[2] & 07777, $dst_fh;
583 chown $stat[4], $stat[5], $dst_fh; 605 chown $stat[4], $stat[5], $dst_fh;
606
607 aioreq_pri $pri;
584 close $dst_fh; 608 add $grp aio_close $dst_fh;
585 } else { 609 } else {
586 $grp->result (-1); 610 $grp->result (-1);
587 close $src_fh; 611 close $src_fh;
588 close $dst_fh; 612 close $dst_fh;
589 613
590 aioreq $pri; 614 aioreq $pri;
591 add $grp aio_unlink $dst; 615 add $grp aio_unlink $dst;
592 }
593 }; 616 }
594 } else {
595 $grp->result (-1);
596 } 617 };
618 } else {
619 $grp->result (-1);
597 }, 620 }
598
599 } else {
600 $grp->result (-1);
601 } 621 },
622
623 } else {
624 $grp->result (-1);
602 }; 625 }
603
604 $grp
605 } 626 };
627
628 $grp
606} 629}
607 630
608=item aio_move $srcpath, $dstpath, $callback->($status) 631=item aio_move $srcpath, $dstpath, $callback->($status)
609 632
610Try 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
… …
616that is successful, unlinking the C<$srcpath>. 639that is successful, unlinking the C<$srcpath>.
617 640
618=cut 641=cut
619 642
620sub aio_move($$;$) { 643sub aio_move($$;$) {
621 aio_block {
622 my ($src, $dst, $cb) = @_; 644 my ($src, $dst, $cb) = @_;
623 645
624 my $pri = aioreq_pri; 646 my $pri = aioreq_pri;
625 my $grp = aio_group $cb; 647 my $grp = aio_group $cb;
626 648
627 aioreq_pri $pri; 649 aioreq_pri $pri;
628 add $grp aio_rename $src, $dst, sub { 650 add $grp aio_rename $src, $dst, sub {
629 if ($_[0] && $! == EXDEV) { 651 if ($_[0] && $! == EXDEV) {
630 aioreq_pri $pri; 652 aioreq_pri $pri;
631 add $grp aio_copy $src, $dst, sub { 653 add $grp aio_copy $src, $dst, sub {
632 $grp->result ($_[0]);
633
634 if (!$_[0]) {
635 aioreq_pri $pri;
636 add $grp aio_unlink $src;
637 }
638 };
639 } else {
640 $grp->result ($_[0]); 654 $grp->result ($_[0]);
655
656 if (!$_[0]) {
657 aioreq_pri $pri;
658 add $grp aio_unlink $src;
659 }
641 } 660 };
661 } else {
662 $grp->result ($_[0]);
642 }; 663 }
643
644 $grp
645 } 664 };
665
666 $grp
646} 667}
647 668
648=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) 669=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
649 670
650Scans a directory (similar to C<aio_readdir>) but additionally tries to 671Scans a directory (similar to C<aio_readdir>) but additionally tries to
… …
698directory counting heuristic. 719directory counting heuristic.
699 720
700=cut 721=cut
701 722
702sub aio_scandir($$;$) { 723sub aio_scandir($$;$) {
703 aio_block {
704 my ($path, $maxreq, $cb) = @_; 724 my ($path, $maxreq, $cb) = @_;
705 725
706 my $pri = aioreq_pri; 726 my $pri = aioreq_pri;
707 727
708 my $grp = aio_group $cb; 728 my $grp = aio_group $cb;
709 729
710 $maxreq = 4 if $maxreq <= 0; 730 $maxreq = 4 if $maxreq <= 0;
711 731
712 # 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
713 aioreq_pri $pri; 740 aioreq_pri $pri;
714 add $grp aio_stat $path, sub { 741 add $grp aio_readdir $path, sub {
742 my $entries = shift
715 return $grp->result () if $_[0]; 743 or return $grp->result ();
716 my $now = time;
717 my $hash1 = join ":", (stat _)[0,1,3,7,9];
718 744
719 # read the directory entries 745 # stat the dir another time
720 aioreq_pri $pri; 746 aioreq_pri $pri;
721 add $grp aio_readdir $path, sub {
722 my $entries = shift
723 or return $grp->result ();
724
725 # stat the dir another time
726 aioreq_pri $pri;
727 add $grp aio_stat $path, sub { 747 add $grp aio_stat $path, sub {
728 my $hash2 = join ":", (stat _)[0,1,3,7,9]; 748 my $hash2 = join ":", (stat _)[0,1,3,7,9];
729 749
730 my $ndirs; 750 my $ndirs;
731 751
732 # take the slow route if anything looks fishy 752 # take the slow route if anything looks fishy
733 if ($hash1 ne $hash2 or (stat _)[9] == $now) { 753 if ($hash1 ne $hash2 or (stat _)[9] == $now) {
734 $ndirs = -1; 754 $ndirs = -1;
735 } else { 755 } else {
736 # if nlink == 2, we are finished 756 # if nlink == 2, we are finished
737 # on non-posix-fs's, we rely on nlink < 2 757 # on non-posix-fs's, we rely on nlink < 2
738 $ndirs = (stat _)[3] - 2 758 $ndirs = (stat _)[3] - 2
739 or return $grp->result ([], $entries); 759 or return $grp->result ([], $entries);
740 } 760 }
741 761
742 # sort into likely dirs and likely nondirs 762 # sort into likely dirs and likely nondirs
743 # dirs == files without ".", short entries first 763 # dirs == files without ".", short entries first
744 $entries = [map $_->[0], 764 $entries = [map $_->[0],
745 sort { $b->[1] cmp $a->[1] } 765 sort { $b->[1] cmp $a->[1] }
746 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], 766 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
747 @$entries]; 767 @$entries];
748 768
749 my (@dirs, @nondirs); 769 my (@dirs, @nondirs);
750 770
751 my $statgrp = add $grp aio_group sub { 771 my $statgrp = add $grp aio_group sub {
752 $grp->result (\@dirs, \@nondirs); 772 $grp->result (\@dirs, \@nondirs);
753 }; 773 };
754 774
755 limit $statgrp $maxreq; 775 limit $statgrp $maxreq;
756 feed $statgrp sub { 776 feed $statgrp sub {
757 return unless @$entries; 777 return unless @$entries;
758 my $entry = pop @$entries; 778 my $entry = pop @$entries;
759 779
760 aioreq_pri $pri; 780 aioreq_pri $pri;
761 add $statgrp aio_stat "$path/$entry/.", sub { 781 add $statgrp aio_stat "$path/$entry/.", sub {
762 if ($_[0] < 0) { 782 if ($_[0] < 0) {
763 push @nondirs, $entry; 783 push @nondirs, $entry;
764 } else { 784 } else {
765 # need to check for real directory 785 # need to check for real directory
766 aioreq_pri $pri; 786 aioreq_pri $pri;
767 add $statgrp aio_lstat "$path/$entry", sub { 787 add $statgrp aio_lstat "$path/$entry", sub {
768 if (-d _) { 788 if (-d _) {
769 push @dirs, $entry; 789 push @dirs, $entry;
770 790
771 unless (--$ndirs) { 791 unless (--$ndirs) {
772 push @nondirs, @$entries; 792 push @nondirs, @$entries;
773 feed $statgrp; 793 feed $statgrp;
774 }
775 } else {
776 push @nondirs, $entry;
777 } 794 }
795 } else {
796 push @nondirs, $entry;
778 } 797 }
779 } 798 }
780 }; 799 }
781 }; 800 };
782 }; 801 };
783 }; 802 };
784 }; 803 };
785
786 $grp
787 } 804 };
805
806 $grp
788} 807}
789 808
790=item aio_rmtree $path, $callback->($status) 809=item aio_rmtree $path, $callback->($status)
791 810
792Delete a directory tree starting (and including) C<$path>, return the 811Delete a directory tree starting (and including) C<$path>, return the
… …
796 815
797=cut 816=cut
798 817
799sub aio_rmtree; 818sub aio_rmtree;
800sub aio_rmtree($;$) { 819sub aio_rmtree($;$) {
801 aio_block {
802 my ($path, $cb) = @_; 820 my ($path, $cb) = @_;
803 821
804 my $pri = aioreq_pri; 822 my $pri = aioreq_pri;
805 my $grp = aio_group $cb; 823 my $grp = aio_group $cb;
806 824
807 aioreq_pri $pri; 825 aioreq_pri $pri;
808 add $grp aio_scandir $path, 0, sub { 826 add $grp aio_scandir $path, 0, sub {
809 my ($dirs, $nondirs) = @_; 827 my ($dirs, $nondirs) = @_;
810 828
811 my $dirgrp = aio_group sub { 829 my $dirgrp = aio_group sub {
812 add $grp aio_rmdir $path, sub { 830 add $grp aio_rmdir $path, sub {
813 $grp->result ($_[0]); 831 $grp->result ($_[0]);
814 };
815 }; 832 };
816
817 (aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs;
818 (aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs;
819
820 add $grp $dirgrp;
821 }; 833 };
822 834
823 $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;
824 } 839 };
840
841 $grp
825} 842}
843
844=item aio_sync $callback->($status)
845
846Asynchronously call sync and call the callback when finished.
826 847
827=item aio_fsync $fh, $callback->($status) 848=item aio_fsync $fh, $callback->($status)
828 849
829Asynchronously call fsync on the given filehandle and call the callback 850Asynchronously call fsync on the given filehandle and call the callback
830with the fsync result code. 851with the fsync result code.
… …
834Asynchronously call fdatasync on the given filehandle and call the 855Asynchronously call fdatasync on the given filehandle and call the
835callback with the fdatasync result code. 856callback with the fdatasync result code.
836 857
837If 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
838detected, 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}
839 898
840=item aio_group $callback->(...) 899=item aio_group $callback->(...)
841 900
842This 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
843container 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
… …
980itself. 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.
981 1040
982=item $grp->result (...) 1041=item $grp->result (...)
983 1042
984Set 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
985subrequests have finished and set thre groups errno to the current value 1044subrequests have finished and set the groups errno to the current value
986of 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,
987no argument will be passed and errno is zero. 1046no argument will be passed and errno is zero.
988 1047
989=item $grp->errno ([$errno]) 1048=item $grp->errno ([$errno])
990 1049
… …
1188 1247
1189The default is probably ok in most situations, especially if thread 1248The default is probably ok in most situations, especially if thread
1190creation 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
1191want to use larger values. 1250want to use larger values.
1192 1251
1193=item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs 1252=item IO::AIO::max_outstanding $maxreqs
1194 1253
1195This is a very bad function to use in interactive programs because it 1254This is a very bad function to use in interactive programs because it
1196blocks, and a bad way to reduce concurrency because it is inexact: Better 1255blocks, and a bad way to reduce concurrency because it is inexact: Better
1197use an C<aio_group> together with a feed callback. 1256use an C<aio_group> together with a feed callback.
1198 1257
1199Sets the maximum number of outstanding requests to C<$nreqs>. If you 1258Sets the maximum number of outstanding requests to C<$nreqs>. If you
1200to 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
1201C<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>)
1202function will block until the limit is no longer exceeded. 1261function will block until the limit is no longer exceeded.
1203 1262
1204The 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
1205number of outstanding requests. 1264number of outstanding requests.
1206 1265
1207You can still queue as many requests as you want. Therefore, 1266You can still queue as many requests as you want. Therefore,
1208C<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
1209as 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).
1210 1269
1211=back 1270=back
1212 1271
1213=head3 STATISTICAL INFORMATION 1272=head3 STATISTICAL INFORMATION
… …
1235but not yet processed by poll_cb). 1294but not yet processed by poll_cb).
1236 1295
1237=back 1296=back
1238 1297
1239=cut 1298=cut
1240
1241# support function to convert a fd into a perl filehandle
1242sub _fd2fh {
1243 return undef if $_[0] < 0;
1244
1245 # try to generate nice filehandles
1246 my $sym = "IO::AIO::fd#$_[0]";
1247 local *$sym;
1248
1249 open *$sym, "+<&=$_[0]" # usually works under any unix
1250 or open *$sym, "<&=$_[0]" # cygwin needs this
1251 or open *$sym, ">&=$_[0]" # or this
1252 or return undef;
1253
1254 *$sym
1255}
1256 1299
1257min_parallel 8; 1300min_parallel 8;
1258 1301
1259END { flush } 1302END { flush }
1260 1303
… …
1284bytes of memory. In addition, stat requests need a stat buffer (possibly 1327bytes of memory. In addition, stat requests need a stat buffer (possibly
1285a 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
1286scalars 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
1287will consume memory till the request has entered the done state. 1330will consume memory till the request has entered the done state.
1288 1331
1289This 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
1290problem. 1333problem.
1291 1334
1292Per-thread usage: 1335Per-thread usage:
1293 1336
1294In 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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