1 package Devel::GlobalDestruction;
8 use Sub::Exporter::Progressive -setup => {
9 exports => [ qw(in_global_destruction) ],
10 groups => { default => [ -all ] },
13 # we run 5.14+ - everything is in core
15 if (defined ${^GLOBAL_PHASE}) {
16 eval 'sub in_global_destruction () { ${^GLOBAL_PHASE} eq q[DESTRUCT] }; 1'
19 # try to load the xs version if it was compiled
23 XSLoader::load(__PACKAGE__, $VERSION);
26 # the eval already installed everything, nothing to do
30 eval 'sub in_global_destruction () { B::main_start()->isa(q[B::NULL]) }; 1'
34 1; # keep require happy
41 Devel::GlobalDestruction - Expose the flag which marks global
47 use Devel::GlobalDestruction;
49 use namespace::clean; # to avoid having an "in_global_destruction" method
52 return if in_global_destruction;
54 do_something_a_little_tricky();
59 Perl's global destruction is a little tricky to deal with WRT finalizers
60 because it's not ordered and objects can sometimes disappear.
62 Writing defensive destructors is hard and annoying, and usually if global
63 destruction is happenning you only need the destructors that free up non
64 process local resources to actually execute.
66 For these constructors you can avoid the mess by simply bailing out if global
67 destruction is in effect.
71 This module uses L<Sub::Exporter::Progressive> so the exports may be renamed,
72 aliased, etc. if L<Sub::Exporter> is present.
76 =item in_global_destruction
78 Returns true if the interpreter is in global destruction. In perl 5.14+, this
79 returns C<${^GLOBAL_PHASE} eq 'DESTRUCT'>, and on earlier perls, it returns the
80 current value of C<PL_dirty>.
86 Yuval Kogman E<lt>nothingmuch@woobling.orgE<gt>
88 Florian Ragwitz E<lt>rafl@debian.orgE<gt>
90 Jesse Luehrs E<lt>doy@tozt.netE<gt>
92 Peter Rabbitson E<lt>ribasushi@cpan.orgE<gt>
94 Arthur Axel 'fREW' Schmidt E<lt>frioux@gmail.comE<gt>
96 Elizabeth Mattijsen E<lt>liz@dijkmat.nlE<gt>
100 Copyright (c) 2008 Yuval Kogman. All rights reserved
101 This program is free software; you can redistribute
102 it and/or modify it under the same terms as Perl itself.