ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/IO-AIO/AIO.pm
(Generate patch)

Comparing IO-AIO/AIO.pm (file contents):
Revision 1.111 by root, Mon Aug 13 12:08:13 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 aio_truncate); 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
… …
526memory. Status is the same as with aio_read. 540memory. Status is the same as with aio_read.
527 541
528=cut 542=cut
529 543
530sub aio_load($$;$) { 544sub aio_load($$;$) {
531 aio_block {
532 my ($path, undef, $cb) = @_; 545 my ($path, undef, $cb) = @_;
533 my $data = \$_[1]; 546 my $data = \$_[1];
534 547
535 my $pri = aioreq_pri; 548 my $pri = aioreq_pri;
536 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);
537 555
538 aioreq_pri $pri; 556 aioreq_pri $pri;
539 add $grp aio_open $path, O_RDONLY, 0, sub {
540 my $fh = shift
541 or return $grp->result (-1);
542
543 aioreq_pri $pri;
544 add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub { 557 add $grp aio_read $fh, 0, (-s $fh), $$data, 0, sub {
545 $grp->result ($_[0]); 558 $grp->result ($_[0]);
546 };
547 }; 559 };
548
549 $grp
550 } 560 };
561
562 $grp
551} 563}
552 564
553=item aio_copy $srcpath, $dstpath, $callback->($status) 565=item aio_copy $srcpath, $dstpath, $callback->($status)
554 566
555Try 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
… …
566errors are being ignored. 578errors are being ignored.
567 579
568=cut 580=cut
569 581
570sub aio_copy($$;$) { 582sub aio_copy($$;$) {
571 aio_block {
572 my ($src, $dst, $cb) = @_; 583 my ($src, $dst, $cb) = @_;
573 584
574 my $pri = aioreq_pri; 585 my $pri = aioreq_pri;
575 my $grp = aio_group $cb; 586 my $grp = aio_group $cb;
576 587
577 aioreq_pri $pri; 588 aioreq_pri $pri;
578 add $grp aio_open $src, O_RDONLY, 0, sub { 589 add $grp aio_open $src, O_RDONLY, 0, sub {
579 if (my $src_fh = $_[0]) { 590 if (my $src_fh = $_[0]) {
580 my @stat = stat $src_fh; 591 my @stat = stat $src_fh;
581 592
582 aioreq_pri $pri; 593 aioreq_pri $pri;
583 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 {
584 if (my $dst_fh = $_[0]) { 595 if (my $dst_fh = $_[0]) {
585 aioreq_pri $pri; 596 aioreq_pri $pri;
586 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub { 597 add $grp aio_sendfile $dst_fh, $src_fh, 0, $stat[7], sub {
587 if ($_[0] == $stat[7]) { 598 if ($_[0] == $stat[7]) {
588 $grp->result (0); 599 $grp->result (0);
589 close $src_fh; 600 close $src_fh;
590 601
591 # those should not normally block. should. should. 602 # those should not normally block. should. should.
592 utime $stat[8], $stat[9], $dst; 603 utime $stat[8], $stat[9], $dst;
593 chmod $stat[2] & 07777, $dst_fh; 604 chmod $stat[2] & 07777, $dst_fh;
594 chown $stat[4], $stat[5], $dst_fh; 605 chown $stat[4], $stat[5], $dst_fh;
606
607 aioreq_pri $pri;
595 close $dst_fh; 608 add $grp aio_close $dst_fh;
596 } else { 609 } else {
597 $grp->result (-1); 610 $grp->result (-1);
598 close $src_fh; 611 close $src_fh;
599 close $dst_fh; 612 close $dst_fh;
600 613
601 aioreq $pri; 614 aioreq $pri;
602 add $grp aio_unlink $dst; 615 add $grp aio_unlink $dst;
603 }
604 }; 616 }
605 } else {
606 $grp->result (-1);
607 } 617 };
618 } else {
619 $grp->result (-1);
608 }, 620 }
609
610 } else {
611 $grp->result (-1);
612 } 621 },
622
623 } else {
624 $grp->result (-1);
613 }; 625 }
614
615 $grp
616 } 626 };
627
628 $grp
617} 629}
618 630
619=item aio_move $srcpath, $dstpath, $callback->($status) 631=item aio_move $srcpath, $dstpath, $callback->($status)
620 632
621Try 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
… …
627that is successful, unlinking the C<$srcpath>. 639that is successful, unlinking the C<$srcpath>.
628 640
629=cut 641=cut
630 642
631sub aio_move($$;$) { 643sub aio_move($$;$) {
632 aio_block {
633 my ($src, $dst, $cb) = @_; 644 my ($src, $dst, $cb) = @_;
634 645
635 my $pri = aioreq_pri; 646 my $pri = aioreq_pri;
636 my $grp = aio_group $cb; 647 my $grp = aio_group $cb;
637 648
638 aioreq_pri $pri; 649 aioreq_pri $pri;
639 add $grp aio_rename $src, $dst, sub { 650 add $grp aio_rename $src, $dst, sub {
640 if ($_[0] && $! == EXDEV) { 651 if ($_[0] && $! == EXDEV) {
641 aioreq_pri $pri; 652 aioreq_pri $pri;
642 add $grp aio_copy $src, $dst, sub { 653 add $grp aio_copy $src, $dst, sub {
643 $grp->result ($_[0]);
644
645 if (!$_[0]) {
646 aioreq_pri $pri;
647 add $grp aio_unlink $src;
648 }
649 };
650 } else {
651 $grp->result ($_[0]); 654 $grp->result ($_[0]);
655
656 if (!$_[0]) {
657 aioreq_pri $pri;
658 add $grp aio_unlink $src;
659 }
652 } 660 };
661 } else {
662 $grp->result ($_[0]);
653 }; 663 }
654
655 $grp
656 } 664 };
665
666 $grp
657} 667}
658 668
659=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs) 669=item aio_scandir $path, $maxreq, $callback->($dirs, $nondirs)
660 670
661Scans a directory (similar to C<aio_readdir>) but additionally tries to 671Scans a directory (similar to C<aio_readdir>) but additionally tries to
… …
709directory counting heuristic. 719directory counting heuristic.
710 720
711=cut 721=cut
712 722
713sub aio_scandir($$;$) { 723sub aio_scandir($$;$) {
714 aio_block {
715 my ($path, $maxreq, $cb) = @_; 724 my ($path, $maxreq, $cb) = @_;
716 725
717 my $pri = aioreq_pri; 726 my $pri = aioreq_pri;
718 727
719 my $grp = aio_group $cb; 728 my $grp = aio_group $cb;
720 729
721 $maxreq = 4 if $maxreq <= 0; 730 $maxreq = 4 if $maxreq <= 0;
722 731
723 # 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
724 aioreq_pri $pri; 740 aioreq_pri $pri;
725 add $grp aio_stat $path, sub { 741 add $grp aio_readdir $path, sub {
742 my $entries = shift
726 return $grp->result () if $_[0]; 743 or return $grp->result ();
727 my $now = time;
728 my $hash1 = join ":", (stat _)[0,1,3,7,9];
729 744
730 # read the directory entries 745 # stat the dir another time
731 aioreq_pri $pri; 746 aioreq_pri $pri;
732 add $grp aio_readdir $path, sub {
733 my $entries = shift
734 or return $grp->result ();
735
736 # stat the dir another time
737 aioreq_pri $pri;
738 add $grp aio_stat $path, sub { 747 add $grp aio_stat $path, sub {
739 my $hash2 = join ":", (stat _)[0,1,3,7,9]; 748 my $hash2 = join ":", (stat _)[0,1,3,7,9];
740 749
741 my $ndirs; 750 my $ndirs;
742 751
743 # take the slow route if anything looks fishy 752 # take the slow route if anything looks fishy
744 if ($hash1 ne $hash2 or (stat _)[9] == $now) { 753 if ($hash1 ne $hash2 or (stat _)[9] == $now) {
745 $ndirs = -1; 754 $ndirs = -1;
746 } else { 755 } else {
747 # if nlink == 2, we are finished 756 # if nlink == 2, we are finished
748 # on non-posix-fs's, we rely on nlink < 2 757 # on non-posix-fs's, we rely on nlink < 2
749 $ndirs = (stat _)[3] - 2 758 $ndirs = (stat _)[3] - 2
750 or return $grp->result ([], $entries); 759 or return $grp->result ([], $entries);
751 } 760 }
752 761
753 # sort into likely dirs and likely nondirs 762 # sort into likely dirs and likely nondirs
754 # dirs == files without ".", short entries first 763 # dirs == files without ".", short entries first
755 $entries = [map $_->[0], 764 $entries = [map $_->[0],
756 sort { $b->[1] cmp $a->[1] } 765 sort { $b->[1] cmp $a->[1] }
757 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length], 766 map [$_, sprintf "%s%04d", (/.\./ ? "1" : "0"), length],
758 @$entries]; 767 @$entries];
759 768
760 my (@dirs, @nondirs); 769 my (@dirs, @nondirs);
761 770
762 my $statgrp = add $grp aio_group sub { 771 my $statgrp = add $grp aio_group sub {
763 $grp->result (\@dirs, \@nondirs); 772 $grp->result (\@dirs, \@nondirs);
764 }; 773 };
765 774
766 limit $statgrp $maxreq; 775 limit $statgrp $maxreq;
767 feed $statgrp sub { 776 feed $statgrp sub {
768 return unless @$entries; 777 return unless @$entries;
769 my $entry = pop @$entries; 778 my $entry = pop @$entries;
770 779
771 aioreq_pri $pri; 780 aioreq_pri $pri;
772 add $statgrp aio_stat "$path/$entry/.", sub { 781 add $statgrp aio_stat "$path/$entry/.", sub {
773 if ($_[0] < 0) { 782 if ($_[0] < 0) {
774 push @nondirs, $entry; 783 push @nondirs, $entry;
775 } else { 784 } else {
776 # need to check for real directory 785 # need to check for real directory
777 aioreq_pri $pri; 786 aioreq_pri $pri;
778 add $statgrp aio_lstat "$path/$entry", sub { 787 add $statgrp aio_lstat "$path/$entry", sub {
779 if (-d _) { 788 if (-d _) {
780 push @dirs, $entry; 789 push @dirs, $entry;
781 790
782 unless (--$ndirs) { 791 unless (--$ndirs) {
783 push @nondirs, @$entries; 792 push @nondirs, @$entries;
784 feed $statgrp; 793 feed $statgrp;
785 }
786 } else {
787 push @nondirs, $entry;
788 } 794 }
795 } else {
796 push @nondirs, $entry;
789 } 797 }
790 } 798 }
791 }; 799 }
792 }; 800 };
793 }; 801 };
794 }; 802 };
795 }; 803 };
796
797 $grp
798 } 804 };
805
806 $grp
799} 807}
800 808
801=item aio_rmtree $path, $callback->($status) 809=item aio_rmtree $path, $callback->($status)
802 810
803Delete a directory tree starting (and including) C<$path>, return the 811Delete a directory tree starting (and including) C<$path>, return the
… …
807 815
808=cut 816=cut
809 817
810sub aio_rmtree; 818sub aio_rmtree;
811sub aio_rmtree($;$) { 819sub aio_rmtree($;$) {
812 aio_block {
813 my ($path, $cb) = @_; 820 my ($path, $cb) = @_;
814 821
815 my $pri = aioreq_pri; 822 my $pri = aioreq_pri;
816 my $grp = aio_group $cb; 823 my $grp = aio_group $cb;
817 824
818 aioreq_pri $pri; 825 aioreq_pri $pri;
819 add $grp aio_scandir $path, 0, sub { 826 add $grp aio_scandir $path, 0, sub {
820 my ($dirs, $nondirs) = @_; 827 my ($dirs, $nondirs) = @_;
821 828
822 my $dirgrp = aio_group sub { 829 my $dirgrp = aio_group sub {
823 add $grp aio_rmdir $path, sub { 830 add $grp aio_rmdir $path, sub {
824 $grp->result ($_[0]); 831 $grp->result ($_[0]);
825 };
826 }; 832 };
827
828 (aioreq_pri $pri), add $dirgrp aio_rmtree "$path/$_" for @$dirs;
829 (aioreq_pri $pri), add $dirgrp aio_unlink "$path/$_" for @$nondirs;
830
831 add $grp $dirgrp;
832 }; 833 };
833 834
834 $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;
835 } 839 };
840
841 $grp
836} 842}
843
844=item aio_sync $callback->($status)
845
846Asynchronously call sync and call the callback when finished.
837 847
838=item aio_fsync $fh, $callback->($status) 848=item aio_fsync $fh, $callback->($status)
839 849
840Asynchronously call fsync on the given filehandle and call the callback 850Asynchronously call fsync on the given filehandle and call the callback
841with the fsync result code. 851with the fsync result code.
… …
845Asynchronously call fdatasync on the given filehandle and call the 855Asynchronously call fdatasync on the given filehandle and call the
846callback with the fdatasync result code. 856callback with the fdatasync result code.
847 857
848If 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
849detected, 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}
850 898
851=item aio_group $callback->(...) 899=item aio_group $callback->(...)
852 900
853This 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
854container 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
… …
991itself. 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.
992 1040
993=item $grp->result (...) 1041=item $grp->result (...)
994 1042
995Set 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
996subrequests have finished and set thre groups errno to the current value 1044subrequests have finished and set the groups errno to the current value
997of 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,
998no argument will be passed and errno is zero. 1046no argument will be passed and errno is zero.
999 1047
1000=item $grp->errno ([$errno]) 1048=item $grp->errno ([$errno])
1001 1049
… …
1199 1247
1200The default is probably ok in most situations, especially if thread 1248The default is probably ok in most situations, especially if thread
1201creation 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
1202want to use larger values. 1250want to use larger values.
1203 1251
1204=item $oldmaxreqs = IO::AIO::max_outstanding $maxreqs 1252=item IO::AIO::max_outstanding $maxreqs
1205 1253
1206This is a very bad function to use in interactive programs because it 1254This is a very bad function to use in interactive programs because it
1207blocks, and a bad way to reduce concurrency because it is inexact: Better 1255blocks, and a bad way to reduce concurrency because it is inexact: Better
1208use an C<aio_group> together with a feed callback. 1256use an C<aio_group> together with a feed callback.
1209 1257
1210Sets the maximum number of outstanding requests to C<$nreqs>. If you 1258Sets the maximum number of outstanding requests to C<$nreqs>. If you
1211to 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
1212C<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>)
1213function will block until the limit is no longer exceeded. 1261function will block until the limit is no longer exceeded.
1214 1262
1215The 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
1216number of outstanding requests. 1264number of outstanding requests.
1217 1265
1218You can still queue as many requests as you want. Therefore, 1266You can still queue as many requests as you want. Therefore,
1219C<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
1220as 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).
1221 1269
1222=back 1270=back
1223 1271
1224=head3 STATISTICAL INFORMATION 1272=head3 STATISTICAL INFORMATION
… …
1246but not yet processed by poll_cb). 1294but not yet processed by poll_cb).
1247 1295
1248=back 1296=back
1249 1297
1250=cut 1298=cut
1251
1252# support function to convert a fd into a perl filehandle
1253sub _fd2fh {
1254 return undef if $_[0] < 0;
1255
1256 # try to generate nice filehandles
1257 my $sym = "IO::AIO::fd#$_[0]";
1258 local *$sym;
1259
1260 open *$sym, "+<&=$_[0]" # usually works under any unix
1261 or open *$sym, "<&=$_[0]" # cygwin needs this
1262 or open *$sym, ">&=$_[0]" # or this
1263 or return undef;
1264
1265 *$sym
1266}
1267 1299
1268min_parallel 8; 1300min_parallel 8;
1269 1301
1270END { flush } 1302END { flush }
1271 1303

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines