Upgrade to threads 2.21

Author: jdhedden

Porting/Maintainers.pl

@@ -1160,7 +1160,7 @@ package Maintainers;
     },
 
     'threads' => {
-        'DISTRIBUTION' => 'JDHEDDEN/threads-2.16.tar.gz',
+        'DISTRIBUTION' => 'JDHEDDEN/threads-2.21.tar.gz',
         'FILES'        => q[dist/threads],
         'EXCLUDED'     => [
             qr{^examples/},

dist/threads/t/exit.t

@@ -48,7 +48,7 @@ my $rc = $thr->join();
 ok(! defined($rc), 'Exited: threads->exit()');
 
 
-run_perl(prog => 'use threads 2.16;' .
+run_perl(prog => 'use threads 2.21;' .
                  'threads->exit(86);' .
                  'exit(99);',
          nolib => ($ENV{PERL_CORE}) ? 0 : 1,
@@ -98,7 +98,7 @@ $rc = $thr->join();
 ok(! defined($rc), 'Exited: $thr->set_thread_exit_only');
 
 
-run_perl(prog => 'use threads 2.16 qw(exit thread_only);' .
+run_perl(prog => 'use threads 2.21 qw(exit thread_only);' .
                  'threads->create(sub { exit(99); })->join();' .
                  'exit(86);',
          nolib => ($ENV{PERL_CORE}) ? 0 : 1,
@@ -108,7 +108,7 @@ run_perl(prog => 'use threads 2.16 qw(exit thread_only);' .
     is($?>>8, 86, "'use threads 'exit' => 'thread_only'");
 }
 
-my $out = run_perl(prog => 'use threads 2.16;' .
+my $out = run_perl(prog => 'use threads 2.21;' .
                            'threads->create(sub {' .
                            '    exit(99);' .
                            '});' .
@@ -124,7 +124,7 @@ my $out = run_perl(prog => 'use threads 2.16;' .
 like($out, qr/1 finished and unjoined/, "exit(status) in thread");
 
 
-$out = run_perl(prog => 'use threads 2.16 qw(exit thread_only);' .
+$out = run_perl(prog => 'use threads 2.21 qw(exit thread_only);' .
                         'threads->create(sub {' .
                         '   threads->set_thread_exit_only(0);' .
                         '   exit(99);' .
@@ -141,7 +141,7 @@ $out = run_perl(prog => 'use threads 2.16 qw(exit thread_only);' .
 like($out, qr/1 finished and unjoined/, "set_thread_exit_only(0)");
 
 
-run_perl(prog => 'use threads 2.16;' .
+run_perl(prog => 'use threads 2.21;' .
                  'threads->create(sub {' .
                  '   $SIG{__WARN__} = sub { exit(99); };' .
                  '   die();' .

dist/threads/t/thread.t

@@ -161,7 +161,7 @@ package main;
 
 # bugid #24165
 
-run_perl(prog => 'use threads 2.16;' .
+run_perl(prog => 'use threads 2.21;' .
                  'sub a{threads->create(shift)} $t = a sub{};' .
                  '$t->tid; $t->join; $t->tid',
          nolib => ($ENV{PERL_CORE}) ? 0 : 1,