| 1 |
=head1 NAME |
| 2 |
|
| 3 |
Coro::Select - a (slow but event-aware) replacement for CORE::select |
| 4 |
|
| 5 |
=head1 SYNOPSIS |
| 6 |
|
| 7 |
use Coro::Select; # replace select globally |
| 8 |
use Core::Select 'select'; # only in this module |
| 9 |
use Coro::Select (); # use Coro::Select::select |
| 10 |
|
| 11 |
=head1 DESCRIPTION |
| 12 |
|
| 13 |
This module tries to create a fully working replacement for perl's |
| 14 |
C<select> built-in, using C<Event> watchers to do the job, so other |
| 15 |
coroutines can run in parallel. |
| 16 |
|
| 17 |
To be effective globally, this module must be C<use>'d before any other |
| 18 |
module that uses C<select>, so it should generally be the first module |
| 19 |
C<use>'d in the main program. |
| 20 |
|
| 21 |
You can also invoke it from the commandline as C<perl -MCoro::Select>. |
| 22 |
|
| 23 |
=over 4 |
| 24 |
|
| 25 |
=cut |
| 26 |
|
| 27 |
package Coro::Select; |
| 28 |
|
| 29 |
use strict; |
| 30 |
|
| 31 |
use Event; |
| 32 |
|
| 33 |
use Coro; |
| 34 |
use Coro::Event; |
| 35 |
|
| 36 |
use base Exporter::; |
| 37 |
|
| 38 |
our $VERSION = 1.5; |
| 39 |
our @EXPORT_OK = "select"; |
| 40 |
|
| 41 |
sub import { |
| 42 |
my $pkg = shift; |
| 43 |
if (@_) { |
| 44 |
$pkg->export (scalar caller 0, @_); |
| 45 |
} else { |
| 46 |
$pkg->export ("CORE::GLOBAL", "select"); |
| 47 |
} |
| 48 |
} |
| 49 |
|
| 50 |
sub select(;*$$$) { # not the correct prototype, but well... :() |
| 51 |
warn "select<@_>\n";#d# |
| 52 |
if (@_ == 0) { |
| 53 |
return CORE::select; |
| 54 |
} elsif (@_ == 1) { |
| 55 |
return CORE::select $_[0]; |
| 56 |
} elsif (defined $_[3] && !$_[3]) { |
| 57 |
return CORE::select (@_); |
| 58 |
} else { |
| 59 |
my $current = $Coro::current; |
| 60 |
my $nfound = 0; |
| 61 |
my @w; |
| 62 |
for ([0, 'r'], [1, 'w'], [2, 'e']) { |
| 63 |
my ($i, $poll) = @$_; |
| 64 |
if (defined (my $vec = $_[$i])) { |
| 65 |
my $rvec = \$_[$i]; |
| 66 |
for my $b (0 .. (8 * length $vec)) { |
| 67 |
if (vec $vec, $b, 1) { |
| 68 |
(vec $$rvec, $b, 1) = 0; |
| 69 |
push @w, |
| 70 |
Event->io (fd => $b, poll => $poll, cb => sub { |
| 71 |
(vec $$rvec, $b, 1) = 1; |
| 72 |
$nfound++; |
| 73 |
$current->ready; |
| 74 |
}); |
| 75 |
} |
| 76 |
} |
| 77 |
} |
| 78 |
} |
| 79 |
|
| 80 |
push @w, |
| 81 |
Event->timer (after => $_[3], cb => sub { |
| 82 |
$current->ready; |
| 83 |
}); |
| 84 |
|
| 85 |
Coro::schedule; |
| 86 |
# wait here |
| 87 |
|
| 88 |
$_->cancel for @w; |
| 89 |
return $nfound; |
| 90 |
} |
| 91 |
} |
| 92 |
|
| 93 |
1; |
| 94 |
|
| 95 |
=back |
| 96 |
|
| 97 |
=head1 AUTHOR |
| 98 |
|
| 99 |
Marc Lehmann <schmorp@schmorp.de> |
| 100 |
http://home.schmorp.de/ |
| 101 |
|
| 102 |
=cut |
| 103 |
|
| 104 |
|
