/usr/share/perl5/Devel/GlobalDestruction.pm is in libdevel-globaldestruction-perl 0.13-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | package Devel::GlobalDestruction;
use strict;
use warnings;
our $VERSION = '0.13';
use Sub::Exporter::Progressive -setup => {
exports => [ qw(in_global_destruction) ],
groups => { default => [ -all ] },
};
# we run 5.14+ - everything is in core
#
if (defined ${^GLOBAL_PHASE}) {
eval 'sub in_global_destruction () { ${^GLOBAL_PHASE} eq q[DESTRUCT] }; 1'
or die $@;
}
# try to load the xs version if it was compiled
#
elsif (eval {
require Devel::GlobalDestruction::XS;
no warnings 'once';
*in_global_destruction = \&Devel::GlobalDestruction::XS::in_global_destruction;
1;
}) {
# the eval already installed everything, nothing to do
}
else {
# internally, PL_main_cv is set to Nullcv immediately before entering
# global destruction and we can use B to detect that. B::main_cv will
# only ever be a B::CV or a B::SPECIAL that is a reference to 0
require B;
eval 'sub in_global_destruction () { ${B::main_cv()} == 0 }; 1'
or die $@;
}
1; # keep require happy
__END__
=head1 NAME
Devel::GlobalDestruction - Provides function returning the equivalent of
C<${^GLOBAL_PHASE} eq 'DESTRUCT'> for older perls.
=head1 SYNOPSIS
package Foo;
use Devel::GlobalDestruction;
use namespace::clean; # to avoid having an "in_global_destruction" method
sub DESTROY {
return if in_global_destruction;
do_something_a_little_tricky();
}
=head1 DESCRIPTION
Perl's global destruction is a little tricky to deal with WRT finalizers
because it's not ordered and objects can sometimes disappear.
Writing defensive destructors is hard and annoying, and usually if global
destruction is happening you only need the destructors that free up non
process local resources to actually execute.
For these constructors you can avoid the mess by simply bailing out if global
destruction is in effect.
=head1 EXPORTS
This module uses L<Sub::Exporter::Progressive> so the exports may be renamed,
aliased, etc. if L<Sub::Exporter> is present.
=over 4
=item in_global_destruction
Returns true if the interpreter is in global destruction. In perl 5.14+, this
returns C<${^GLOBAL_PHASE} eq 'DESTRUCT'>, and on earlier perls, detects it using
the value of C<PL_main_cv> or C<PL_dirty>.
=back
=head1 AUTHORS
Yuval Kogman E<lt>nothingmuch@woobling.orgE<gt>
Florian Ragwitz E<lt>rafl@debian.orgE<gt>
Jesse Luehrs E<lt>doy@tozt.netE<gt>
Peter Rabbitson E<lt>ribasushi@cpan.orgE<gt>
Arthur Axel 'fREW' Schmidt E<lt>frioux@gmail.comE<gt>
Elizabeth Mattijsen E<lt>liz@dijkmat.nlE<gt>
Greham Knop E<lt>haarg@haarg.orgE<gt>
=head1 COPYRIGHT
Copyright (c) 2008 Yuval Kogman. All rights reserved
This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
=cut
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