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#-*- perl -*-
#
# Copyright (C) 2000,2001,2002 Ken'ichi Fukamachi
# All rights reserved. This program is free software; you can
# redistribute it and/or modify it under the same terms as Perl itself.
#
# $FML: PCB.pm,v 1.12 2002/09/22 14:56:41 fukachan Exp $
#
package FML::PCB;
use strict;
use Carp;
use vars qw(%_fml_PCB); # PCB: Process Control Block (malloc it here)
=head1 NAME
FML::PCB -- hold some information for the current process
=head1 SYNOPSIS
$pcb = new FML::PCB;
$pcb->set('lock', 'object', $lockobj);
$lockobj = $pcb->get('lock', 'object');
=head1 DESCRIPTION
=head2 DATA STRUCTURE
C<$curproc>->C<{ pcb }> area holds some information on the current process.
The hash holds several references to other data structures.
Typically, $curproc is composed like this:
$curproc = {
pcb => {
key => value,
},
incoming_message => $r_msg,
article => $r_msg,
... snip ...
};
=head1 METHODS
=head2 C<new( $args )>
initialize the C<pcb> memory area.
If $args HASH REFERENCE is specified, initialize C<pcb> area by it.
=cut
# Descriptions: constructor. bind object to private hash
# Arguments: OBJ($self) HASH_REF($args)
# Side Effects: bind object to internal hash
# Return Value: OBJ
sub new
{
my ($self, $args) = @_;
unless (defined %_fml_PCB) { %_fml_PCB = ();}
my $me = \%_fml_PCB;
# import variables
if (defined $args) {
my ($k, $v);
while (($k, $v) = each %$args) { set($me, $k, $v);}
}
return bless $me, $self;
}
=head2 C<dump_variables()>
show all {key => value} for debug.
=head2 C<get( category, key )>
You must specify C<category> and C<key>.
=head2 C<set( category, key, value)>
You must specify C<category>, C<key> and the C<value>.
=cut
# Descriptions: print out hash {key => value}
# Arguments: NONE
# Side Effects: none
# Return Value: none
sub dump_variables
{
my ($k, $v);
while (($k, $v) = each %_fml_PCB) {
print "${k}: $v\n";
}
}
# Descriptions: get value for $key in $category
# Arguments: OBJ($self) STR($category) STR($key)
# Side Effects: none
# Return Value: STR
sub get
{
my ($self, $category, $key) = @_;
if (defined $self->{ $category }->{ $key }) {
$self->{ $category }->{ $key };
}
else {
undef;
}
}
# Descriptions: set value for $key in $category
# Arguments: OBJ($self) STR($category) STR($key) STR($value)
# Side Effects: none
# Return Value: STR
sub set
{
my ($self, $category, $key, $value) = @_;
$self->{ $category }->{ $key } = $value;
}
=head1 CODING STYLE
See C<http://www.fml.org/software/FNF/> on fml coding style guide.
=head1 AUTHOR
Ken'ichi Fukamachi
=head1 COPYRIGHT
Copyright (C) 2000,2001,2002 Ken'ichi Fukamachi
All rights reserved. This program is free software; you can
redistribute it and/or modify it under the same terms as Perl itself.
=head1 HISTORY
FML::PCB first appeared in fml8 mailing list driver package.
See C<http://www.fml.org/> for more details.
=cut
1;
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