-#!/usr/bin/perl
-
package Devel::GlobalDestruction;
use strict;
use warnings;
-use vars qw($VERSION @ISA);
+our $VERSION = '0.06';
-BEGIN {
- $VERSION = '0.02';
+use Sub::Exporter -setup => {
+ exports => [ qw(in_global_destruction) ],
+ groups => { default => [ -all ] },
+};
- local $@;
+# we run 5.14+ - everything is in core
+#
+if (defined ${^GLOBAL_PHASE}) {
+ eval 'sub in_global_destruction () { ${^GLOBAL_PHASE} eq q[DESTRUCT] }';
+}
+# try to load the xs version if it was compiled
+#
+elsif (eval {
+ require XSLoader;
+ XSLoader::load(__PACKAGE__, $VERSION);
+ 1;
+}) {
+ # the eval already installed everything, nothing to do
+}
+# Not core nor XS
+#
+else {
+
+ # SpeedyCGI runs END blocks every cycle but somehow keeps object instances
+ # hence DIAF
+ die("The pure-perl version of @{[__PACKAGE__]} can not function correctly under CGI::SpeedyCGI. "
+ . "Please ensure you have a working compiler, and reinstall @{[__PACKAGE__]} to enable the XS "
+ . "codepath.\n"
+ ) if $CGI::SpeedyCGI::i_am_speedy;
+
+ eval <<'PP_IGD' or die $@;
+
+my ($in_global_destruction, $before_is_installed);
+
+sub in_global_destruction { $in_global_destruction }
+
+# This block will fire towards the end of the program execution
+# Since there is no way for us to generate an END which will execute *last*
+# this is *NOT 100% INCOMPATIBLE* with XS/${^GLOBAL_PHASE}. We *may* end up
+# with a true in_gloal_destruction() in the middle of another END block
+# There are no practical cases where this matters.
+#
+END {
+ $in_global_destruction = 1;
+}
- eval {
- require XSLoader;
- __PACKAGE__->XSLoader::load($VERSION);
- 1;
- } or do {
- require DynaLoader;
- push @ISA, 'DynaLoader';
- __PACKAGE__->bootstrap($VERSION);
- };
+# threads do not execute the global ENDs (it would be stupid). However
+# one can register a new END via simple string eval within a thread, and
+# achieve the same result. A logical place to do this would be CLONE, which
+# is claimed to run in the context of the new thread. However this does
+# not really seem to be the case - any END evaled in a CLONE is ignored :(
+# Hence blatantly hooking threads::create
+#
+if ($INC{'threads.pm'}) {
+ my $orig_create = threads->can('create');
+ no warnings 'redefine';
+ *threads::create = sub {
+ { local $@; eval 'END { $in_global_destruction = 1 }' };
+ goto $orig_create;
+ };
+ $before_is_installed = 1;
}
-use Sub::Exporter -setup => {
- exports => [ qw(in_global_destruction) ],
- groups => { default => [ -all ] },
-};
+# just in case threads got loaded after us (silly)
+sub CLONE {
+ unless ($before_is_installed) {
+ require Carp;
+ Carp::croak("You must load the 'threads' module before @{[ __PACKAGE__ ]}");
+ }
+}
-__PACKAGE__
+1; # keep eval happy
-__END__
+PP_IGD
-=pod
+}
+
+1; # keep require happy
+
+
+__END__
=head1 NAME
-Devel::GlobalDestruction - Expose PL_dirty, the flag which marks global
+Devel::GlobalDestruction - Expose the flag which marks global
destruction.
=head1 SYNOPSIS
- package Foo;
- use Devel::GlobalDestruction;
+ package Foo;
+ use Devel::GlobalDestruction;
- use namespace::clean; # to avoid having an "in_global_destruction" method
+ use namespace::clean; # to avoid having an "in_global_destruction" method
- sub DESTROY {
- return if in_global_destruction;
+ sub DESTROY {
+ return if in_global_destruction;
- do_something_a_little_tricky();
- }
+ do_something_a_little_tricky();
+ }
=head1 DESCRIPTION
=item in_global_destruction
-Returns the current value of C<PL_dirty>.
+Returns true if the interpreter is in global destruction. In perl 5.14+, this
+returns C<${^GLOBAL_PHASE} eq 'DESTRUCT'>, and on earlier perls, it returns the
+current value of C<PL_dirty>.
=back
-=head1 VERSION CONTROL
+=head1 AUTHORS
-This module is maintained using Darcs. You can get the latest version from
-L<http://nothingmuch.woobling.org/code>, and use C<darcs send> to commit
-changes.
+Yuval Kogman E<lt>nothingmuch@woobling.orgE<gt>
-=head1 AUTHOR
+Florian Ragwitz E<lt>rafl@debian.orgE<gt>
-Yuval Kogman E<lt>nothingmuch@woobling.orgE<gt>
+Jesse Luehrs E<lt>doy@tozt.netE<gt>
+
+Peter Rabbitson E<lt>ribasushi@cpan.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.
+ 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
-
-
projects / p5sagit/Devel-GlobalDestruction.git / blobdiff