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+Tue Sep  1 18:16:32 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* thread_sync.c (queue_do_close): ignore multiple close to allow
+	  multiple producers.
+	  https://bugs.ruby-lang.org/issues/10600#note-14
+
 Tue Sep  1 18:06:26 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* thread_tools.c: rename thread_tools.c to thread_sync.c.