-#!/usr/bin/perl
-
package Devel::GlobalDestruction;
use strict;
use warnings;
-use XSLoader;
-
-our $VERSION = '0.03';
+our $VERSION = '0.09';
-use Sub::Exporter -setup => {
- exports => [ qw(in_global_destruction) ],
- groups => { default => [ -all ] },
+use Sub::Exporter::Progressive -setup => {
+ exports => [ qw(in_global_destruction) ],
+ groups => { default => [ -all ] },
};
-if ($] >= 5.013007) {
- eval 'sub in_global_destruction () { ${^GLOBAL_PHASE} eq q[DESTRUCT] }';
+# 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 XSLoader;
+ XSLoader::load(__PACKAGE__, $VERSION);
+ 1;
+}) {
+ # the eval already installed everything, nothing to do
+}
+# Not core nor XS
+# The whole thing is in an eval to prevent perl from parsing it in the
+# first place under perls where none of this is needed
+#
else {
- XSLoader::load(__PACKAGE__, $VERSION);
+ eval <<'PP_IGD' or die $@;
+
+# 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 $CGI::SpeedyCGI::i_am_speedy;
+
+my ($in_global_destruction, $before_is_installed);
+
+sub in_global_destruction () { $in_global_destruction }
+
+# end_av trick suggested by liz++
+require B;
+my $add_endblock = sub {
+ push @{ B::end_av()->object_2svref }, sub { $in_global_destruction = 1 };
+};
+
+# This block will fire towards the end of the program execution
+# Use it to inject an END block which is guaranteed to run last
+# (as long as something else doesn't inject yet another block in
+# the same manner afterwards, at which point it hardly matters
+# anyway)
+#
+END { $add_endblock->() }
+
+# threads do not execute the global ENDs (it would be stupid). However
+# one can register a new thread-local END from within a thread, and
+# achieve the same result. A logical place to do this would be CLONE, which
+# is claimed to run in the context of the new thread. However this does
+# not really seem to be the case - any END inserted in a CLONE is ignored :(
+# Hence blatantly hooking threads::create
+#
+if ($INC{'threads.pm'}) {
+ require Scalar::Util;
+
+ my $orig_create = threads->can('create');
+ no warnings 'redefine';
+
+ *threads::create = sub {
+ my $class = shift;
+ my $target = shift;
+
+ unless ( (Scalar::Util::reftype($target)||'') eq 'CODE' ) {
+ no strict 'refs';
+ $target = \&{ caller() . "::$target" };
+ }
+
+ @_ = (
+ $class,
+ sub {
+ # Perls compiled with THREADS_HAVE_PIDS do not copy end_av properly
+ # between threads, so B::end_av ends up returning a B::SPECIAL and it
+ # goes downhill from there
+ # Install a noop END just to be on the safe side
+ { local $@; eval 'END {}' }
+ $add_endblock->();
+ goto $target
+ },
+ @_,
+ );
+
+ goto $orig_create;
+ };
+
+ $before_is_installed = 1;
+}
+
+# just in case threads got loaded after us (silly)
+sub CLONE {
+ unless ($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
=head1 EXPORTS
-This module uses L<Sub::Exporter> so the exports may be renamed, aliased, etc.
+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 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
-
-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.
-
=head1 AUTHORS
Yuval Kogman E<lt>nothingmuch@woobling.orgE<gt>
Florian Ragwitz E<lt>rafl@debian.orgE<gt>
-=head1 COPYRIGHT
+Jesse Luehrs E<lt>doy@tozt.netE<gt>
- 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.
+Peter Rabbitson E<lt>ribasushi@cpan.orgE<gt>
-=cut
+Arthur Axel 'fREW' Schmidt E<lt>frioux@gmail.comE<gt>
+
+Elizabeth Mattijsen E<lt>liz@dijkmat.nlE<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
projects / p5sagit/Devel-GlobalDestruction.git / blobdiff