*** pgsql/src/include/utils/tuplestore.h	2008/03/25 19:26:53	1.23
--- pgsql/src/include/utils/tuplestore.h	2008/10/01 19:51:50	1.24
***************
*** 11,16 ****
--- 11,18 ----
   * before it has all been written.	This is particularly useful for cursors,
   * because it allows random access within the already-scanned portion of
   * a query without having to process the underlying scan to completion.
+  * Also, it is possible to support multiple independent read pointers.
+  *
   * A temporary file is used to handle the data if it exceeds the
   * space limit specified by the caller.
   *
***************
*** 22,28 ****
   * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   * Portions Copyright (c) 1994, Regents of the University of California
   *
!  * $PostgreSQL: pgsql/src/include/utils/tuplestore.h,v 1.22 2008/01/01 19:45:59 momjian Exp $
   *
   *-------------------------------------------------------------------------
   */
--- 24,30 ----
   * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   * Portions Copyright (c) 1994, Regents of the University of California
   *
!  * $PostgreSQL: pgsql/src/include/utils/tuplestore.h,v 1.23 2008/03/25 19:26:53 neilc Exp $
   *
   *-------------------------------------------------------------------------
   */
*************** extern void tuplestore_putvalues(Tuplest
*** 57,72 ****
  /* tuplestore_donestoring() used to be required, but is no longer used */
  #define tuplestore_donestoring(state)	((void) 0)
  
  extern bool tuplestore_gettupleslot(Tuplestorestate *state, bool forward,
  						TupleTableSlot *slot);
  extern bool tuplestore_advance(Tuplestorestate *state, bool forward);
  
- extern void tuplestore_end(Tuplestorestate *state);
- 
  extern bool tuplestore_ateof(Tuplestorestate *state);
  
  extern void tuplestore_rescan(Tuplestorestate *state);
! extern void tuplestore_markpos(Tuplestorestate *state);
! extern void tuplestore_restorepos(Tuplestorestate *state);
  
  #endif   /* TUPLESTORE_H */
--- 59,79 ----
  /* tuplestore_donestoring() used to be required, but is no longer used */
  #define tuplestore_donestoring(state)	((void) 0)
  
+ extern int	tuplestore_alloc_read_pointer(Tuplestorestate *state, int eflags);
+ 
+ extern void tuplestore_select_read_pointer(Tuplestorestate *state, int ptr);
+ 
+ extern void tuplestore_copy_read_pointer(Tuplestorestate *state,
+ 										 int srcptr, int destptr);
+ 
  extern bool tuplestore_gettupleslot(Tuplestorestate *state, bool forward,
  						TupleTableSlot *slot);
  extern bool tuplestore_advance(Tuplestorestate *state, bool forward);
  
  extern bool tuplestore_ateof(Tuplestorestate *state);
  
  extern void tuplestore_rescan(Tuplestorestate *state);
! 
! extern void tuplestore_end(Tuplestorestate *state);
  
  #endif   /* TUPLESTORE_H */