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+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+require "thread"
+
+module Qpid
+
+ class Closed < Exception; end
+
+ class Queue < Queue
+
+ @@END = Object.new()
+
+ def close()
+ # sentinal to indicate the end of the queue
+ self << @@END
+ end
+
+ def pop(*args)
+ result = super(*args)
+ if @@END.equal? result
+ # we put another sentinal on the end in case there are
+ # subsequent calls to pop by this or other threads
+ self << @@END
+ raise Closed.new()
+ else
+ return result
+ end
+ end
+
+ alias shift pop
+ alias deq pop
+
+ end
+
+end