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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --            S Y S T E M . P A R T I T I O N _ I N T E R F A C E           --
   6 --                                                                          --
   7 --                                  S p e c                                 --
   8 --                                                                          --
   9 --          Copyright (C) 1995-2007, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This unit may be used directly from an application program by providing
  35 --  an appropriate WITH, and the interface can be expected to remain stable.
  36
  37 with Ada.Exceptions;
  38 with Ada.Streams;
  39 with Interfaces;
  40 with System.RPC;
  41
  42 package System.Partition_Interface is
  43
  44    pragma Elaborate_Body;
  45
  46    type DSA_Implementation_Name is (No_DSA, GARLIC_DSA, PolyORB_DSA);
  47    DSA_Implementation : constant DSA_Implementation_Name := No_DSA;
  48    --  Identification of this DSA implementation variant
  49
  50    PCS_Version : constant := 1;
  51    --  Version of the PCS API (for Exp_Dist consistency check).
  52    --  This version number is matched against Gnatvsn.PCS_Version_Number to
  53    --  ensure that the versions of Exp_Dist and the PCS are consistent.
  54
  55    --  RCI receiving stubs contain a table of descriptors for
  56    --  all user subprograms exported by the unit.
  57
  58    type Subprogram_Id is new Natural;
  59    First_RCI_Subprogram_Id : constant := 2;
  60
  61    type RCI_Subp_Info is record
  62       Addr : System.Address;
  63       --  Local address of the proxy object
  64    end record;
  65
  66    type RCI_Subp_Info_Access is access all RCI_Subp_Info;
  67    type RCI_Subp_Info_Array is array (Integer range <>) of
  68      aliased RCI_Subp_Info;
  69
  70    subtype Unit_Name is String;
  71    --  Name of Ada units
  72
  73    type Main_Subprogram_Type is access procedure;
  74
  75    type RACW_Stub_Type is tagged record
  76       Origin       : RPC.Partition_ID;
  77       Receiver     : Interfaces.Unsigned_64;
  78       Addr         : Interfaces.Unsigned_64;
  79       Asynchronous : Boolean;
  80    end record;
  81
  82    type RACW_Stub_Type_Access is access RACW_Stub_Type;
  83    --  This type is used by the expansion to implement distributed objects.
  84    --  Do not change its definition or its layout without updating
  85    --  exp_dist.adb.
  86
  87    type RAS_Proxy_Type is tagged limited record
  88       All_Calls_Remote : Boolean;
  89       Receiver         : System.Address;
  90       Subp_Id          : Subprogram_Id;
  91    end record;
  92
  93    type RAS_Proxy_Type_Access is access RAS_Proxy_Type;
  94    pragma No_Strict_Aliasing (RAS_Proxy_Type_Access);
  95    --  This type is used by the expansion to implement distributed objects.
  96    --  Do not change its definition or its layout without updating
  97    --  Exp_Dist.Build_Remote_Subprogram_Proxy_Type.
  98
  99    --  The Request_Access type is used for communication between the PCS
 100    --  and the RPC receiver generated by the compiler: it contains all the
 101    --  necessary information for the receiver to process an incoming call.
 102
 103    type RST_Access is access all Ada.Streams.Root_Stream_Type'Class;
 104    type Request_Access is record
 105       Params : RST_Access;
 106       --  A stream describing the called subprogram and its parameters
 107
 108       Result : RST_Access;
 109       --  A stream where the result, raised exception, or out values,
 110       --  are marshalled.
 111    end record;
 112
 113    procedure Check
 114      (Name    : Unit_Name;
 115       Version : String;
 116       RCI     : Boolean := True);
 117    --  Use by the main subprogram to check that a remote receiver
 118    --  unit has has the same version than the caller's one.
 119
 120    function Same_Partition
 121       (Left  : not null access RACW_Stub_Type;
 122        Right : not null access RACW_Stub_Type) return Boolean;
 123    --  Determine whether Left and Right correspond to objects instantiated
 124    --  on the same partition, for enforcement of E.4(19).
 125
 126    function Get_Active_Partition_ID (Name : Unit_Name) return RPC.Partition_ID;
 127    --  Similar in some respects to RCI_Locator.Get_Active_Partition_ID
 128
 129    function Get_Active_Version (Name : Unit_Name) return String;
 130    --  Similar in some respects to Get_Active_Partition_ID
 131
 132    function Get_Local_Partition_ID return RPC.Partition_ID;
 133    --  Return the Partition_ID of the current partition
 134
 135    function Get_Passive_Partition_ID
 136      (Name : Unit_Name) return RPC.Partition_ID;
 137    --  Return the Partition_ID of the given shared passive partition
 138
 139    function Get_Passive_Version (Name : Unit_Name) return String;
 140    --  Return the version corresponding to a shared passive unit
 141
 142    function Get_RCI_Package_Receiver
 143      (Name : Unit_Name) return Interfaces.Unsigned_64;
 144    --  Similar in some respects to RCI_Locator.Get_RCI_Package_Receiver
 145
 146    procedure Get_Unique_Remote_Pointer
 147      (Handler : in out RACW_Stub_Type_Access);
 148    --  Get a unique pointer on a remote object
 149
 150    procedure Raise_Program_Error_Unknown_Tag
 151      (E : Ada.Exceptions.Exception_Occurrence);
 152    pragma No_Return (Raise_Program_Error_Unknown_Tag);
 153    --  Raise Program_Error with the same message as E one
 154
 155    type RPC_Receiver is access procedure (R : Request_Access);
 156    procedure Register_Receiving_Stub
 157      (Name          : Unit_Name;
 158       Receiver      : RPC_Receiver;
 159       Version       : String := "";
 160       Subp_Info     : System.Address;
 161       Subp_Info_Len : Integer);
 162    --  Register the fact that the Name receiving stub is now elaborated.
 163    --  Register the access value to the package RPC_Receiver procedure.
 164
 165    procedure Get_RAS_Info
 166      (Name          :  Unit_Name;
 167       Subp_Id       :  Subprogram_Id;
 168       Proxy_Address : out Interfaces.Unsigned_64);
 169    --  Look up the address of the proxy object for the given subprogram
 170    --  in the named unit, or Null_Address if not present on the local
 171    --  partition.
 172
 173    procedure Register_Passive_Package
 174      (Name    : Unit_Name;
 175       Version : String := "");
 176    --  Register a passive package
 177
 178    generic
 179       RCI_Name : String;
 180       Version  : String;
 181    package RCI_Locator is
 182       pragma Unreferenced (Version);
 183
 184       function Get_RCI_Package_Receiver return Interfaces.Unsigned_64;
 185       function Get_Active_Partition_ID return RPC.Partition_ID;
 186    end RCI_Locator;
 187    --  RCI package information caching
 188
 189    procedure Run (Main : Main_Subprogram_Type := null);
 190    --  Run the main subprogram
 191
 192 end System.Partition_Interface;