use strict;
use warnings;
-our $VERSION = '0.05';
+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 ] },
};
+# we run 5.14+ - everything is in core
+#
if (defined ${^GLOBAL_PHASE}) {
- eval 'sub in_global_destruction () { ${^GLOBAL_PHASE} eq q[DESTRUCT] }';
+ 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;
+ require XSLoader;
+ XSLoader::load(__PACKAGE__, $VERSION);
+ 1;
}) {
- # the eval already installed everything, nothing to do
+ # the eval already installed everything, nothing to do
}
-else {
+# We need pure-perl and we are running under -c
+# None of the END-block trickery will work, use a global scope guard instead,
+# as it is more than adequate in this situation
+# The whole thing is in an eval to prevent perl from parsing it in the
+# first place where none of this is needed
+#
+elsif ($^C) {
+ eval <<'PP_IGD' or die $@;
+
+ my $in_global_destruction;
+
+ sub in_global_destruction () { $in_global_destruction }
+
+ {
+ package Devel::GlobalDestgruction::_MinusC::ScopeGuard;
+ sub DESTROY { shift->[0]->() };
+ }
- # 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;
+ no warnings 'once';
+ $Devel::GlobalDestgruction::_MinusC::guard = bless [sub {
+ $in_global_destruction = 1;
+ }], 'Devel::GlobalDestgruction::_MinusC::ScopeGuard';
+ 1; # keep eval happy
+
+PP_IGD
+}
+# 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 {
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 }
+sub in_global_destruction () { $in_global_destruction }
-END {
- $in_global_destruction = 1;
-}
+# 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 { $add_endblock->() }
# threads do not execute the global ENDs (it would be stupid). However
-# one can register a new END via simple string eval within a thread, and
+# one can register a new thread-local END from within a thread, and
# achieve the same result. A logical place to do this would be CLONE, which
# is claimed to run in the context of the new thread. However this does
-# not really seem to be the case - any END evaled in a CLONE is ignored :(
+# not really seem to be the case - any END inserted in a CLONE is ignored :(
# Hence blatantly hooking threads::create
-
+#
if ($INC{'threads.pm'}) {
+ require Scalar::Util;
+
my $orig_create = threads->can('create');
no warnings 'redefine';
+
*threads::create = sub {
- { local $@; eval 'END { $in_global_destruction = 1 }' };
+ 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;
}
=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
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>
+
=head1 COPYRIGHT
Copyright (c) 2008 Yuval Kogman. All rights reserved
projects / p5sagit/Devel-GlobalDestruction.git / blobdiff