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diff --git a/ace/UPIPE_Acceptor.h b/ace/UPIPE_Acceptor.h
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+/* -*- C++ -*- */
+// $Id$
+
+
+// ============================================================================
+//
+// = LIBRARY
+//    ace
+// 
+// = FILENAME
+//    UPIPE_Acceptor.h
+//
+// = AUTHOR
+//    Gerhard Lenzer and Douglas C. Schmidt
+// 
+// ============================================================================
+
+#if !defined (ACE_UPIPE_ACCEPTOR_H) 
+#define ACE_UPIPE_ACCEPTOR_H
+
+#include "ace/UPIPE_Stream.h"
+#include "ace/Synch.h"
+#include "ace/SPIPE_Acceptor.h"
+#include "ace/Thread_Manager.h"
+
+#if defined (ACE_HAS_THREADS)
+
+class ACE_Export ACE_UPIPE_Acceptor : public ACE_SPIPE_Acceptor
+  // = TITLE
+  //     Defines the format and interface for the listener side of the
+  //     ACE_UPIPE_Stream.
+{
+public:
+  // = Initialization and termination.
+  ACE_UPIPE_Acceptor (void);
+  // Default constructor.
+
+  ACE_UPIPE_Acceptor (const ACE_UPIPE_Addr &local_sap, 
+		      int reuse_addr = 0);
+  // Initialize passive endpoint.
+  
+  int open (const ACE_UPIPE_Addr &local_sap, 
+	    int reuse_addr = 0);
+  // Initialize passive endpoint.
+
+  ~ACE_UPIPE_Acceptor (void);
+  // Close down and release resources.
+
+  int close (void);
+  // Close down and release resources.
+
+  int remove (void);
+  // Close down and release resources and remove the underlying SPIPE
+  // rendezvous point. 
+
+  // = Passive connection acceptance method.
+  int accept (ACE_UPIPE_Stream &server_stream, 
+	      ACE_UPIPE_Addr *remote_addr = 0,
+	      ACE_Time_Value *timeout = 0, 
+	      int restart = 1);
+  // Accept a new data transfer connection.  A <timeout> of 0 means
+  // block forever, a <timeout> of {0, 0} means poll.  <restart> == 1
+  // means "restart if interrupted."
+  
+  void dump (void) const;
+  // Dump the state of an object.
+
+  ACE_ALLOC_HOOK_DECLARE;
+  // Declare the dynamic allocation hooks.
+
+private:
+  ACE_Thread_Manager tm;
+  // Manage threads.
+
+  ACE_Message_Block mb_;    
+  // To confirm connection establishment.
+};
+
+#include "ace/UPIPE_Acceptor.i"
+#endif /* ACE_HAS_THREADS */
+#endif /* ACE_UPIPE_ACCEPTOR_H */