thread.c: must be initialized to set name

* thread.c (get_initialized_threadptr): extract ensuring that the
  thread is initialized.
* thread.c (rb_thread_setname): thread must be initialized to set
  the name.  [ruby-core:74963] [Bug #12290]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54598 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
index ca162f152f..05bb536111 100644
--- a/test/ruby/test_thread.rb
+++ b/test/ruby/test_thread.rb
@@ -1098,4 +1098,10 @@ q.pop
     t.kill
     t.join
   end
+
+  def test_thread_setname_uninitialized
+    bug12290 = '[ruby-core:74963] [Bug #12290]'
+    c = Class.new(Thread) {def initialize() self.name = "foo" end}
+    assert_raise(ThreadError, bug12290) {c.new {}}
+  end
 end