kazu	2018-12-05 18:07:54 +0900 (Wed, 05 Dec 2018)

  New Revision: 66215

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66215

  Log:
    lib/monitor.rb: prevent to initialize MonitorMixin twice
    
    and allow to initialize again when obj.dup.
    
    Suggested by Benoit Daloze.  [ruby-core:88504] [Feature #15000]

  Modified files:
    trunk/lib/monitor.rb
Index: lib/monitor.rb
===================================================================
--- lib/monitor.rb	(revision 66214)
+++ lib/monitor.rb	(revision 66215)
@@ -255,9 +255,13 @@ module MonitorMixin https://github.com/ruby/ruby/blob/trunk/lib/monitor.rb#L255
   # Initializes the MonitorMixin after being included in a class or when an
   # object has been extended with the MonitorMixin
   def mon_initialize
+    if defined?(@mon_mutex) && @mon_mutex_owner_object_id == object_id
+      raise ThreadError, "already initialized"
+    end
+    @mon_mutex = Thread::Mutex.new
+    @mon_mutex_owner_object_id = object_id
     @mon_owner = nil
     @mon_count = 0
-    @mon_mutex = Thread::Mutex.new
   end
 
   def mon_check_owner

--
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