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package NDB::Util::Event;
use strict;
use Carp;
use Errno;
require NDB::Util::Base;
use vars qw(@ISA);
@ISA = qw(NDB::Util::Base);
# constructors
my $log;
sub initmodule {
$log = NDB::Util::Log->instance;
}
NDB::Util::Event->attributes();
sub new {
my $class = shift;
@_ % 2 == 0 or confess 0+@_;
my(%attr) = @_;
my $event = $class->SUPER::new(%attr);
return $event;
}
# set and test bits
sub check {
my $event = shift;
my($file, $type) = @_;
my $fileno;
if (ref($file) eq 'GLOB') {
$fileno = fileno($file);
}
elsif (ref($file)) {
$file->can("getfh") or confess 'oops';
$fileno = fileno($file->getfh);
}
else {
$fileno = $file;
}
defined($fileno) or confess 'oops';
$fileno =~ s/^\s+|\s+$//g;
$fileno =~ /^\d+$/ or confess 'oops';
$type =~ /^[rwe]$/ or confess 'oops';
return ($fileno, $type);
}
sub set {
my $event = shift;
@_ == 2 or confess 0+@_;
my($fileno, $type) = $event->check(@_);
vec($event->{"i_$type"}, $fileno, 1) = 1;
}
sub clear {
my $event = shift;
@_ == 2 or confess 0+@_;
my($fileno, $type) = $event->check(@_);
vec($event->{"i_$type"}, $fileno, 1) = 0;
}
sub test {
my $event = shift;
@_ == 2 or confess 0+@_;
my($fileno, $type) = $event->check(@_);
return vec($event->{"o_$type"}, $fileno, 1);
}
# poll
sub poll {
my $event = shift;
@_ <= 1 or confess 'oops';
my $timeout = shift;
if (defined($timeout)) {
$timeout =~ /^\d+$/ or confess 'oops';
}
$event->{o_r} = $event->{i_r};
$event->{o_w} = $event->{i_w};
$event->{o_e} = $event->{i_e};
my $n;
$n = select($event->{o_r}, $event->{o_w}, $event->{o_e}, $timeout);
if ($n < 0 || ! defined($n)) {
if ($! == Errno::EINTR) {
$log->put("select interrupted");
return 0;
}
$log->put("select failed: $!");
return undef;
}
if (! $n) {
$log->put("select timed out");
}
return $n;
}
1;
# vim:set sw=4:
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