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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . R P C -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2009, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- <http://www.gnu.org/licenses/>. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- Version for ??? with Unchecked_Deallocation; with Ada.Streams; with System.RPC.Net_Trace; with System.RPC.Garlic; with System.RPC.Streams; pragma Elaborate (System.RPC.Garlic); package body System.RPC is -- ??? general note: the debugging calls are very heavy, especially -- those that create exception handlers in every procedure. Do we -- really still need all this stuff? use type Ada.Streams.Stream_Element_Count; use type Ada.Streams.Stream_Element_Offset; use type Garlic.Protocol_Access; use type Garlic.Lock_Method; Max_Of_Message_Id : constant := 127; subtype Message_Id_Type is Integer range -Max_Of_Message_Id .. Max_Of_Message_Id; -- A message id is either a request id or reply id. A message id is -- provided with a message to a receiving stub which uses the opposite -- as a reply id. A message id helps to retrieve to which task is -- addressed a reply. When the environment task receives a message, the -- message id is extracted : a positive message id stands for a call, a -- negative message id stands for a reply. A null message id stands for -- an asynchronous request. subtype Request_Id_Type is Message_Id_Type range 1 .. Max_Of_Message_Id; -- When a message id is positive, it is a request type Message_Length_Per_Request is array (Request_Id_Type) of Ada.Streams.Stream_Element_Count; Header_Size : Ada.Streams.Stream_Element_Count := Streams.Get_Integer_Initial_Size + Streams.Get_SEC_Initial_Size; -- Initial size needed for frequently used header streams Stream_Error : exception; -- Occurs when a read procedure is executed on an empty stream -- or when a write procedure is executed on a full stream Partition_RPC_Receiver : RPC_Receiver; -- Cache the RPC_Receiver passed by Establish_RPC_Receiver type Anonymous_Task_Node; type Anonymous_Task_Node_Access is access Anonymous_Task_Node; -- Types we need to construct a singly linked list of anonymous tasks -- This pool is maintained to avoid a task creation each time a RPC -- occurs - to be cont'd task type Anonymous_Task_Type (Self : Anonymous_Task_Node_Access) is entry Start (Message_Id : Message_Id_Type; Partition : Partition_ID; Params_Size : Ada.Streams.Stream_Element_Count; Result_Size : Ada.Streams.Stream_Element_Count; Protocol : Garlic.Protocol_Access); -- This entry provides an anonymous task a remote call to perform. -- This task calls for a Request id is provided to construct the -- reply id by using -Request. Partition is used to send the reply -- message. Params_Size is the size of the calling stub Params stream. -- Then Protocol (used by the environment task previously) allows -- extraction of the message following the header (The header is -- extracted by the environment task) -- Note: grammar in above is obscure??? needs cleanup end Anonymous_Task_Type; type Anonymous_Task_Access is access Anonymous_Task_Type; type Anonymous_Task_List is record Head : Anonymous_Task_Node_Access; Tail : Anonymous_Task_Node_Access; end record; type Anonymous_Task_Node is record Element : Anonymous_Task_Access; Next : Anonymous_Task_Node_Access; end record; -- Types we need to construct a singly linked list of anonymous tasks. -- This pool is maintained to avoid a task creation each time a RPC occurs. protected Garbage_Collector is procedure Allocate (Item : out Anonymous_Task_Node_Access); -- Anonymous task pool management : if there is an anonymous task -- left, use it. Otherwise, allocate a new one procedure Deallocate (Item : in out Anonymous_Task_Node_Access); -- Anonymous task pool management : queue this task in the pool -- of inactive anonymous tasks. private Anonymous_List : Anonymous_Task_Node_Access; -- The list root of inactive anonymous tasks end Garbage_Collector; task Dispatcher is entry New_Request (Request : out Request_Id_Type); -- To get a new request entry Wait_On (Request_Id_Type) (Length : out Ada.Streams.Stream_Element_Count); -- To block the calling stub when it waits for a reply -- When it is resumed, we provide the size of the reply entry Wake_Up (Request : Request_Id_Type; Length : Ada.Streams.Stream_Element_Count); -- To wake up the calling stub when the environment task has -- received a reply for this request end Dispatcher; task Environnement is entry Start; -- Receive no message until Partition_Receiver is set -- Establish_RPC_Receiver decides when the environment task -- is allowed to start end Environnement; protected Partition_Receiver is entry Is_Set; -- Blocks if the Partition_RPC_Receiver has not been set procedure Set; -- Done by Establish_RPC_Receiver when Partition_RPC_Receiver -- is known private Was_Set : Boolean := False; -- True when Partition_RPC_Receiver has been set end Partition_Receiver; -- Anonymous tasks have to wait for the Partition_RPC_Receiver -- to be established type Debug_Level is (D_Elaborate, -- About the elaboration of this package D_Communication, -- About calls to Send and Receive D_Debug, -- Verbose D_Exception); -- Exception handler -- Debugging levels package Debugging is new System.RPC.Net_Trace (Debug_Level, "RPC : "); -- Debugging package procedure D (Flag : Debug_Level; Info : String) renames Debugging.Debug; -- Shortcut ------------------------ -- Partition_Receiver -- ------------------------ protected body Partition_Receiver is ------------------------------- -- Partition_Receiver.Is_Set -- ------------------------------- entry Is_Set when Was_Set is begin null; end Is_Set; ---------------------------- -- Partition_Receiver.Set -- ---------------------------- procedure Set is begin Was_Set := True; end Set; end Partition_Receiver; --------------- -- Head_Node -- --------------- procedure Head_Node (Index : out Packet_Node_Access; Stream : Params_Stream_Type) is begin Index := Stream.Extra.Head; exception when others => D (D_Exception, "exception in Head_Node"); raise; end Head_Node; --------------- -- Tail_Node -- --------------- procedure Tail_Node (Index : out Packet_Node_Access; Stream : Params_Stream_Type) is begin Index := Stream.Extra.Tail; exception when others => D (D_Exception, "exception in Tail_Node"); raise; end Tail_Node; --------------- -- Null_Node -- --------------- function Null_Node (Index : Packet_Node_Access) return Boolean is begin return Index = null; exception when others => D (D_Exception, "exception in Null_Node"); raise; end Null_Node; ---------------------- -- Delete_Head_Node -- ---------------------- procedure Delete_Head_Node (Stream : in out Params_Stream_Type) is procedure Free is new Unchecked_Deallocation (Packet_Node, Packet_Node_Access); Next_Node : Packet_Node_Access := Stream.Extra.Head.Next; begin -- Delete head node and free memory usage Free (Stream.Extra.Head); Stream.Extra.Head := Next_Node; -- If the extra storage is empty, update tail as well if Stream.Extra.Head = null then Stream.Extra.Tail := null; end if; exception when others => D (D_Exception, "exception in Delete_Head_Node"); raise; end Delete_Head_Node; --------------- -- Next_Node -- --------------- procedure Next_Node (Node : in out Packet_Node_Access) is begin -- Node is set to the next node -- If not possible, Stream_Error is raised if Node = null then raise Stream_Error; else Node := Node.Next; end if; exception when others => D (D_Exception, "exception in Next_Node"); raise; end Next_Node; --------------------- -- Append_New_Node -- --------------------- procedure Append_New_Node (Stream : in out Params_Stream_Type) is Index : Packet_Node_Access; begin -- Set Index to the end of the linked list Tail_Node (Index, Stream); if Null_Node (Index) then -- The list is empty : set head as well Stream.Extra.Head := new Packet_Node; Stream.Extra.Tail := Stream.Extra.Head; else -- The list is not empty : link new node with tail Stream.Extra.Tail.Next := new Packet_Node; Stream.Extra.Tail := Stream.Extra.Tail.Next; end if; exception when others => D (D_Exception, "exception in Append_New_Node"); raise; end Append_New_Node; ---------- -- Read -- ---------- procedure Read (Stream : in out Params_Stream_Type; Item : out Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset) renames System.RPC.Streams.Read; ----------- -- Write -- ----------- procedure Write (Stream : in out Params_Stream_Type; Item : Ada.Streams.Stream_Element_Array) renames System.RPC.Streams.Write; ----------------------- -- Garbage_Collector -- ----------------------- protected body Garbage_Collector is -------------------------------- -- Garbage_Collector.Allocate -- -------------------------------- procedure Allocate (Item : out Anonymous_Task_Node_Access) is New_Anonymous_Task_Node : Anonymous_Task_Node_Access; Anonymous_Task : Anonymous_Task_Access; begin -- If the list is empty, allocate a new anonymous task -- Otherwise, reuse the first queued anonymous task if Anonymous_List = null then -- Create a new anonymous task -- Provide this new task with its id to allow it -- to enqueue itself into the free anonymous task list -- with the function Deallocate New_Anonymous_Task_Node := new Anonymous_Task_Node; Anonymous_Task := new Anonymous_Task_Type (New_Anonymous_Task_Node); New_Anonymous_Task_Node.all := (Anonymous_Task, null); else -- Extract one task from the list -- Set the Next field to null to avoid possible bugs New_Anonymous_Task_Node := Anonymous_List; Anonymous_List := Anonymous_List.Next; New_Anonymous_Task_Node.Next := null; end if; -- Item is an out parameter Item := New_Anonymous_Task_Node; exception when others => D (D_Exception, "exception in Allocate (Anonymous Task)"); raise; end Allocate; ---------------------------------- -- Garbage_Collector.Deallocate -- ---------------------------------- procedure Deallocate (Item : in out Anonymous_Task_Node_Access) is begin -- Enqueue the task in the free list Item.Next := Anonymous_List; Anonymous_List := Item; exception when others => D (D_Exception, "exception in Deallocate (Anonymous Task)"); raise; end Deallocate; end Garbage_Collector; ------------ -- Do_RPC -- ------------ procedure Do_RPC (Partition : Partition_ID; Params : access Params_Stream_Type; Result : access Params_Stream_Type) is Protocol : Protocol_Access; Request : Request_Id_Type; Header : aliased Params_Stream_Type (Header_Size); R_Length : Ada.Streams.Stream_Element_Count; begin -- Parameters order : -- Opcode (provided and used by garlic) -- (1) Size (provided by s-rpc and used by garlic) -- (size of (2)+(3)+(4)+(5)) -- (2) Request (provided by calling stub (resp receiving stub) and -- used by anonymous task (resp Do_RPC)) -- *** ZERO IF APC *** -- (3) Res.len. (provided by calling stubs and used by anonymous task) -- *** ZERO IF APC *** -- (4) Receiver (provided by calling stubs and used by anonymous task) -- (5) Params (provided by calling stubs and used by anonymous task) -- The call is a remote call or a local call. A local call occurs -- when the pragma All_Calls_Remote has been specified. Do_RPC is -- called and the execution has to be performed in the PCS if Partition /= Garlic.Get_My_Partition_ID then -- Get a request id to be resumed when the reply arrives Dispatcher.New_Request (Request); -- Build header = request (2) + result.initial_size (3) D (D_Debug, "Do_RPC - Build header"); Streams.Allocate (Header); Streams.Integer_Write_Attribute -- (2) (Header'Access, Request); System.RPC.Streams.SEC_Write_Attribute -- (3) (Header'Access, Result.Initial_Size); -- Get a protocol method to communicate with the remote partition -- and give the message size D (D_Communication, "Do_RPC - Lookup for protocol to talk to partition" & Partition_ID'Image (Partition)); Garlic.Initiate_Send (Partition, Streams.Get_Stream_Size (Header'Access) + Streams.Get_Stream_Size (Params), -- (1) Protocol, Garlic.Remote_Call); -- Send the header by using the protocol method D (D_Communication, "Do_RPC - Send Header to partition" & Partition_ID'Image (Partition)); Garlic.Send (Protocol.all, Partition, Header'Access); -- (2) + (3) -- The header is deallocated Streams.Deallocate (Header); -- Send Params from Do_RPC D (D_Communication, "Do_RPC - Send Params to partition" & Partition_ID'Image (Partition)); Garlic.Send (Protocol.all, Partition, Params); -- (4) + (5) -- Let Garlic know we have nothing else to send Garlic.Complete_Send (Protocol.all, Partition); D (D_Debug, "Do_RPC - Suspend"); -- Wait for a reply and get the reply message length Dispatcher.Wait_On (Request) (R_Length); D (D_Debug, "Do_RPC - Resume"); declare New_Result : aliased Params_Stream_Type (R_Length); begin -- Adjust the Result stream size right now to be able to load -- the stream in one receive call. Create a temporary result -- that will be substituted to Do_RPC one Streams.Allocate (New_Result); -- Receive the reply message from receiving stub D (D_Communication, "Do_RPC - Receive Result from partition" & Partition_ID'Image (Partition)); Garlic.Receive (Protocol.all, Partition, New_Result'Access); -- Let Garlic know we have nothing else to receive Garlic.Complete_Receive (Protocol.all, Partition); -- Update calling stub Result stream D (D_Debug, "Do_RPC - Reconstruct Result"); Streams.Deallocate (Result.all); Result.Initial := New_Result.Initial; Streams.Dump ("|||", Result.all); end; else -- Do RPC locally and first wait for Partition_RPC_Receiver to be -- set Partition_Receiver.Is_Set; D (D_Debug, "Do_RPC - Locally"); Partition_RPC_Receiver.all (Params, Result); end if; exception when others => D (D_Exception, "exception in Do_RPC"); raise; end Do_RPC; ------------ -- Do_APC -- ------------ procedure Do_APC (Partition : Partition_ID; Params : access Params_Stream_Type) is Message_Id : Message_Id_Type := 0; Protocol : Protocol_Access; Header : aliased Params_Stream_Type (Header_Size); begin -- For more informations, see above -- Request = 0 as we are not waiting for a reply message -- Result length = 0 as we don't expect a result at all if Partition /= Garlic.Get_My_Partition_ID then -- Build header = request (2) + result.initial_size (3) -- As we have an APC, the request id is null to indicate -- to the receiving stub that we do not expect a reply -- This comes from 0 = -0 D (D_Debug, "Do_APC - Build Header"); Streams.Allocate (Header); Streams.Integer_Write_Attribute (Header'Access, Integer (Message_Id)); Streams.SEC_Write_Attribute (Header'Access, 0); -- Get a protocol method to communicate with the remote partition -- and give the message size D (D_Communication, "Do_APC - Lookup for protocol to talk to partition" & Partition_ID'Image (Partition)); Garlic.Initiate_Send (Partition, Streams.Get_Stream_Size (Header'Access) + Streams.Get_Stream_Size (Params), Protocol, Garlic.Remote_Call); -- Send the header by using the protocol method D (D_Communication, "Do_APC - Send Header to partition" & Partition_ID'Image (Partition)); Garlic.Send (Protocol.all, Partition, Header'Access); -- The header is deallocated Streams.Deallocate (Header); -- Send Params from Do_APC D (D_Communication, "Do_APC - Send Params to partition" & Partition_ID'Image (Partition)); Garlic.Send (Protocol.all, Partition, Params); -- Let Garlic know we have nothing else to send Garlic.Complete_Send (Protocol.all, Partition); else declare Result : aliased Params_Stream_Type (0); begin -- Result is here a dummy parameter -- No reason to deallocate as it is not allocated at all Partition_Receiver.Is_Set; D (D_Debug, "Do_APC - Locally"); Partition_RPC_Receiver.all (Params, Result'Access); end; end if; exception when others => D (D_Exception, "exception in Do_APC"); raise; end Do_APC; ---------------------------- -- Establish_RPC_Receiver -- ---------------------------- procedure Establish_RPC_Receiver (Partition : Partition_ID; Receiver : RPC_Receiver) is begin -- Set Partition_RPC_Receiver and allow RPC mechanism Partition_RPC_Receiver := Receiver; Partition_Receiver.Set; D (D_Elaborate, "Partition_Receiver is set"); exception when others => D (D_Exception, "exception in Establish_RPC_Receiver"); raise; end Establish_RPC_Receiver; ---------------- -- Dispatcher -- ---------------- task body Dispatcher is Last_Request : Request_Id_Type := Request_Id_Type'First; Current_Rqst : Request_Id_Type := Request_Id_Type'First; Current_Size : Ada.Streams.Stream_Element_Count; begin loop -- Three services: -- New_Request to get an entry in Dispatcher table -- Wait_On for Do_RPC calls -- Wake_Up called by environment task when a Do_RPC receives -- the result of its remote call select accept New_Request (Request : out Request_Id_Type) do Request := Last_Request; -- << TODO >> -- ??? Availability check if Last_Request = Request_Id_Type'Last then Last_Request := Request_Id_Type'First; else Last_Request := Last_Request + 1; end if; end New_Request; or accept Wake_Up (Request : Request_Id_Type; Length : Ada.Streams.Stream_Element_Count) do -- The environment reads the header and has been notified -- of the reply id and the size of the result message Current_Rqst := Request; Current_Size := Length; end Wake_Up; -- << TODO >> -- ??? Must be select with delay for aborted tasks select accept Wait_On (Current_Rqst) (Length : out Ada.Streams.Stream_Element_Count) do Length := Current_Size; end Wait_On; or -- To free the Dispatcher when a task is aborted delay 1.0; end select; or terminate; end select; end loop; exception when others => D (D_Exception, "exception in Dispatcher body"); raise; end Dispatcher; ------------------------- -- Anonymous_Task_Type -- ------------------------- task body Anonymous_Task_Type is Whoami : Anonymous_Task_Node_Access := Self; C_Message_Id : Message_Id_Type; -- Current Message Id C_Partition : Partition_ID; -- Current Partition Params_S : Ada.Streams.Stream_Element_Count; -- Params message size Result_S : Ada.Streams.Stream_Element_Count; -- Result message size C_Protocol : Protocol_Access; -- Current Protocol begin loop -- Get a new RPC to execute select accept Start (Message_Id : Message_Id_Type; Partition : Partition_ID; Params_Size : Ada.Streams.Stream_Element_Count; Result_Size : Ada.Streams.Stream_Element_Count; Protocol : Protocol_Access) do C_Message_Id := Message_Id; C_Partition := Partition; Params_S := Params_Size; Result_S := Result_Size; C_Protocol := Protocol; end Start; or terminate; end select; declare Params : aliased Params_Stream_Type (Params_S); Result : aliased Params_Stream_Type (Result_S); Header : aliased Params_Stream_Type (Header_Size); begin -- We reconstruct all the client context : Params and Result -- with the SAME size, then we receive Params from calling stub D (D_Communication, "Anonymous Task - Receive Params from partition" & Partition_ID'Image (C_Partition)); Garlic.Receive (C_Protocol.all, C_Partition, Params'Access); -- Let Garlic know we don't receive anymore Garlic.Complete_Receive (C_Protocol.all, C_Partition); -- Check that Partition_RPC_Receiver has been set Partition_Receiver.Is_Set; -- Do it locally D (D_Debug, "Anonymous Task - Perform Partition_RPC_Receiver for request" & Message_Id_Type'Image (C_Message_Id)); Partition_RPC_Receiver (Params'Access, Result'Access); -- If this was a RPC we send the result back -- Otherwise, do nothing else than deallocation if C_Message_Id /= 0 then -- Build Header = -C_Message_Id + Result Size -- Provide the request id to the env task of the calling -- stub partition We get the real result stream size : the -- calling stub (in Do_RPC) updates its size to this one D (D_Debug, "Anonymous Task - Build Header"); Streams.Allocate (Header); Streams.Integer_Write_Attribute (Header'Access, Integer (-C_Message_Id)); Streams.SEC_Write_Attribute (Header'Access, Streams.Get_Stream_Size (Result'Access)); -- Get a protocol method to communicate with the remote -- partition and give the message size D (D_Communication, "Anonymous Task - Lookup for protocol talk to partition" & Partition_ID'Image (C_Partition)); Garlic.Initiate_Send (C_Partition, Streams.Get_Stream_Size (Header'Access) + Streams.Get_Stream_Size (Result'Access), C_Protocol, Garlic.Remote_Call); -- Send the header by using the protocol method D (D_Communication, "Anonymous Task - Send Header to partition" & Partition_ID'Image (C_Partition)); Garlic.Send (C_Protocol.all, C_Partition, Header'Access); -- Send Result toDo_RPC D (D_Communication, "Anonymous Task - Send Result to partition" & Partition_ID'Image (C_Partition)); Garlic.Send (C_Protocol.all, C_Partition, Result'Access); -- Let Garlic know we don't send anymore Garlic.Complete_Send (C_Protocol.all, C_Partition); Streams.Deallocate (Header); end if; Streams.Deallocate (Params); Streams.Deallocate (Result); end; -- Enqueue into the anonymous task free list : become inactive Garbage_Collector.Deallocate (Whoami); end loop; exception when others => D (D_Exception, "exception in Anonymous_Task_Type body"); raise; end Anonymous_Task_Type; ----------------- -- Environment -- ----------------- task body Environnement is Partition : Partition_ID; Message_Size : Ada.Streams.Stream_Element_Count; Result_Size : Ada.Streams.Stream_Element_Count; Message_Id : Message_Id_Type; Header : aliased Params_Stream_Type (Header_Size); Protocol : Protocol_Access; Anonymous : Anonymous_Task_Node_Access; begin -- Wait the Partition_RPC_Receiver to be set accept Start; D (D_Elaborate, "Environment task elaborated"); loop -- We receive first a fixed size message : the header -- Header = Message Id + Message Size Streams.Allocate (Header); -- Garlic provides the size of the received message and the -- protocol to use to communicate with the calling partition Garlic.Initiate_Receive (Partition, Message_Size, Protocol, Garlic.Remote_Call); D (D_Communication, "Environment task - Receive protocol to talk to active partition" & Partition_ID'Image (Partition)); -- Extract the header to route the message either to -- an anonymous task (Message Id > 0 <=> Request Id) -- or to a waiting task (Message Id < 0 <=> Reply Id) D (D_Communication, "Environment task - Receive Header from partition" & Partition_ID'Image (Partition)); Garlic.Receive (Protocol.all, Partition, Header'Access); -- Evaluate the remaining size of the message Message_Size := Message_Size - Streams.Get_Stream_Size (Header'Access); -- Extract from header : message id and message size Streams.Integer_Read_Attribute (Header'Access, Message_Id); Streams.SEC_Read_Attribute (Header'Access, Result_Size); if Streams.Get_Stream_Size (Header'Access) /= 0 then -- If there are stream elements left in the header ??? D (D_Exception, "Header is not empty"); raise Program_Error; end if; if Message_Id < 0 then -- The message was sent by a receiving stub : wake up the -- calling task - We have a reply there D (D_Debug, "Environment Task - Receive Reply from partition" & Partition_ID'Image (Partition)); Dispatcher.Wake_Up (-Message_Id, Result_Size); else -- The message was send by a calling stub : get an anonymous -- task to perform the job D (D_Debug, "Environment Task - Receive Request from partition" & Partition_ID'Image (Partition)); Garbage_Collector.Allocate (Anonymous); -- We subtracted the size of the header from the size of the -- global message in order to provide immediately Params size Anonymous.Element.Start (Message_Id, Partition, Message_Size, Result_Size, Protocol); end if; -- Deallocate header : unnecessary - WARNING Streams.Deallocate (Header); end loop; exception when others => D (D_Exception, "exception in Environment"); raise; end Environnement; begin -- Set debugging information Debugging.Set_Environment_Variable ("RPC"); Debugging.Set_Debugging_Name ("D", D_Debug); Debugging.Set_Debugging_Name ("E", D_Exception); Debugging.Set_Debugging_Name ("C", D_Communication); Debugging.Set_Debugging_Name ("Z", D_Elaborate); D (D_Elaborate, "To be elaborated"); -- When this body is elaborated we should ensure that RCI name server -- has been already elaborated : this means that Establish_RPC_Receiver -- has already been called and that Partition_RPC_Receiver is set Environnement.Start; D (D_Elaborate, "ELABORATED"); end System.RPC;
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