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diff --git a/tests/Priority_Buffer_Test.cpp b/tests/Priority_Buffer_Test.cpp
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+// ============================================================================
+// @(#)Priority_Buffer_Test.cpp	1.1	10/18/96
+
+//
+// = LIBRARY
+//    tests
+// 
+// = FILENAME
+//    Priority_Buffer_Test.cpp
+//
+// = DESCRIPTION
+//      This is a simple test to illustrate the priority mechanism of
+//      ACE Message_Queues. The producer uses an ASX Message_Queue to
+//      enqueue a bunch of messages with different priorities which
+//      are then dequeued by the consumer.
+//
+// = AUTHOR
+//    Prashant Jain and Doug Schmidt
+// 
+// ============================================================================
+
+#include "ace/Log_Msg.h"
+#include "ace/Message_Queue.h"
+#include "ace/Thread_Manager.h"
+#include "ace/Service_Config.h"
+#include "test_config.h"
+
+#if defined (ACE_HAS_THREADS)
+
+// Global thread manager.
+static ACE_Thread_Manager thr_mgr;
+static int count = 0;
+
+// Make the queue be capable of being *very* large.
+static const long max_queue = LONG_MAX;
+
+// The consumer dequeues a message from the ACE_Message_Queue, writes
+// the message to the stderr stream, and deletes the message.  The
+// producer sends a 0-sized message to inform the consumer to stop
+// reading and exit.
+
+static void *
+consumer (ACE_Message_Queue<ACE_MT_SYNCH> *msg_queue)
+{
+  int cur_priority = 27;
+  int local_count = 0;
+
+  // Keep looping, reading a message out of the queue, until we
+  // get a message with a length == 0, which signals us to quit.
+  for (char c = 'z'; ; c--)
+    {
+      ACE_Message_Block *mb = 0;
+
+      int result = msg_queue->dequeue_head (mb);
+
+      if (result == -1)
+        break;
+
+      local_count++;
+
+      int length = mb->length ();
+      ACE_ASSERT (mb->msg_priority () < cur_priority);
+      cur_priority = mb->msg_priority ();
+
+      if (length > 0)
+	ACE_ASSERT (c == *mb->rd_ptr ());
+
+      // Free up the buffer memory and the Message_Block. Note that
+      // the destructor of Message Block will delete the the actual
+      // buffer.
+      delete mb;
+
+      if (length == 0)
+	break;
+    }
+  ACE_ASSERT (local_count == count);
+  return 0;
+}
+
+// The producer reads data from the stdin stream, creates a message,
+// and then queues the message in the message list, where it is
+// removed by the consumer thread.  A 0-sized message is enqueued when
+// there is no more data to read.  The consumer uses this as a flag to
+// know when to exit.
+
+static void *
+producer (ACE_Message_Queue<ACE_MT_SYNCH> *msg_queue)
+{
+  // Insert thread into thr_mgr.
+  ACE_Thread_Control thread_control (&thr_mgr);
+  ACE_NEW_THREAD;
+
+  ACE_Message_Block *mb = 0;
+
+  for (char c = 'a'; c <= 'z'; c++)
+    {
+      count++;
+
+      // Allocate a new message
+      
+      ACE_NEW_RETURN (mb, ACE_Message_Block (1), 0);
+      *mb->rd_ptr () = c;
+
+      // Set the priority.
+      mb->msg_priority (count);
+      mb->wr_ptr (1);
+      
+      // Enqueue in priority order.
+      if (msg_queue->enqueue (mb) == -1)
+	ACE_ERROR_RETURN ((LM_ERROR, "(%t) %p\n", "put_next"), 0);
+    }
+
+  // Now send a 0-sized shutdown message to the other thread
+  ACE_NEW_RETURN (mb, ACE_Message_Block ((size_t) 0), 0);
+
+  if (msg_queue->enqueue_tail (mb) == -1)
+    ACE_ERROR ((LM_ERROR, "(%t) %p\n", "put_next"));
+
+  count++;
+
+  // Now read all the items out in priority order (i.e., ordered by
+  // the size of the lines!).
+  consumer (msg_queue);
+
+  // The destructor of ACE_Thread_Control removes the exiting thread
+  // from the thr_mgr automatically.
+  return 0; 
+}
+
+// Spawn off one thread that copies stdin to stdout in order of the
+// size of each line.
+
+int 
+main (int argc, char *argv[])
+{
+  ACE_START_TEST;
+
+  // Message queue.
+  ACE_Message_Queue<ACE_MT_SYNCH> msg_queue (max_queue);
+
+  if (thr_mgr.spawn (ACE_THR_FUNC (producer), (void *) &msg_queue,
+		     THR_NEW_LWP | THR_DETACHED) == -1)
+    ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "spawn"), 1);
+
+  // Wait for producer and consumer threads to exit.
+  thr_mgr.wait ();
+
+  ACE_END_TEST;
+  return 0;
+}
+#else
+int 
+main (int, char *[])
+{
+  ACE_ERROR ((LM_ERROR, "threads not supported on this platform\n"));
+  return 0;
+}
+#endif /* ACE_HAS_THREADS */