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# Copyright (c) 1997-2024
# Ewgenij Gawrilow, Michael Joswig, and the polymake team
# Technische Universität Berlin, Germany
# https://polymake.org
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version: http://www.gnu.org/licenses/gpl.txt.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#-------------------------------------------------------------------------------
use strict;
use namespaces;
use warnings qw(FATAL void syntax misc);
package Polymake::Scope;
use Polymake::Struct (
[ '$locals' => 'undef' ],
'%cleanup', # \Object => [ args ] || \&method
);
sub DESTROY {
local interrupts(block);
my ($self) = @_;
# undo locals before performing cleanup actions
delete $self->[0];
while (my ($key, $action) = each %{$self->cleanup}) {
local $@;
eval {
if (is_code($action)) {
$action->($key);
} else {
$key->cleanup($action);
}
};
err_print($@) if $@;
}
}
package Polymake::AtEnd;
my (%names, @actions, @before, @after);
END {
local interrupts(block);
my ($delayed, $succeeded);
# remove dependencies on unregistered actions
my $n = keys %names;
for (my $i = 0; $i <= $n; ++$i) {
if (!defined($actions[$i])) {
foreach (keys %{$before[$i]}) {
delete $after[$_]->{$i};
}
}
}
while (1) {
$delayed = $succeeded = 0;
for (my $i = 0; $i <= $#actions; ++$i) {
next if !defined($actions[$i]);
if (keys(%{$after[$i]}) == 0) {
eval { $actions[$i]->() };
if ($@) {
print STDERR "cleanup in package ", sub_pkg($actions[$i]), " failed:", $@ =~ /\n./ ? "\n" : " ", $@;
}
undef $actions[$i];
foreach (keys %{$before[$i]}) {
delete $after[$_]->{$i};
}
++$succeeded;
} else {
++$delayed;
}
}
if ($delayed) {
if (!$succeeded) {
my @blocked;
while (my ($name, $i) = each %names) {
push @blocked, $name if defined($actions[$i]);
}
print STDERR "deadlock due to circular dependencies between AtEnd actions: ", join(", ", @blocked), "\n";
last;
}
} else {
last;
}
}
}
sub find_id {
my ($name) = @_;
$names{$name} //= do {
my $i = keys %names;
$before[$i] = { };
$after[$i] = { };
$i
}
}
sub add {
$_[0] eq __PACKAGE__ && shift;
my ($name, $action, %relations) = @_;
my $i = find_id($name);
my $ignore_multiple = delete $relations{ignore_multiple};
($actions[$i] &&= do {
if ($ignore_multiple) {
return;
} elsif (sub_pkg($actions[$i]) eq sub_pkg($action)) {
croak( "package ", sub_pkg($action), " tries to install multiple AtEnd actions with the same key '$name'" );
} else {
croak( "packages ", sub_pkg($actions[$i]), " and ", sub_pkg($action), " use the same AtEnd action key '$name'" );
}
}) = $action;
if (defined (my $before = delete $relations{before})) {
foreach (ref($before) ? @$before : $before) {
my $b = find_id($_);
if (exists $after[$i]->{$b}) {
croak( "circular dependency between AtEnd actions $name and $_" );
}
$before[$i]->{$b} = true;
$after[$b]->{$i} = true;
}
}
if (defined (my $after=delete $relations{after})) {
foreach (ref($after) ? @$after : $after) {
my $a=find_id($_);
if (exists $before[$i]->{$a}) {
croak( "circular dependency between AtEnd actions $name and $_" );
}
$before[$a]->{$i} = true;
$after[$i]->{$a} = true;
}
}
if (keys %relations) {
croak( "unknown AtEnd option(s): ", join(",", keys %relations));
}
}
sub forget {
my $name=pop;
if (defined (my $i = $names{$name})) {
delete $actions[$i];
}
}
1
# Local Variables:
# cperl-indent-level:3
# indent-tabs-mode:nil
# End:
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