-- --
-- B o d y --
-- --
--- Copyright (C) 1998-2006, Free Software Foundation, Inc. --
--- --
+-- Copyright (C) 1998-2009, 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 2, or (at your option) any later ver- --
+-- 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
+-- 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. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- 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. --
-- --
------------------------------------------------------------------------------
-with Ada.Exceptions;
with Ada.IO_Exceptions;
with Ada.Streams;
+with Ada.Streams.Stream_IO;
with System.Global_Locks;
with System.Soft_Links;
with System.File_IO;
with System.HTable;
-with Unchecked_Deallocation;
-with Unchecked_Conversion;
+with Ada.Unchecked_Deallocation;
+with Ada.Unchecked_Conversion;
package body System.Shared_Storage is
package SFI renames System.File_IO;
+ package SIO renames Ada.Streams.Stream_IO;
+
type String_Access is access String;
- procedure Free is new Unchecked_Deallocation
+ procedure Free is new Ada.Unchecked_Deallocation
(Object => String, Name => String_Access);
Dir : String_Access;
-- Links for LRU chain
end record;
- procedure Free is new Unchecked_Deallocation
+ procedure Free is new Ada.Unchecked_Deallocation
(Object => Shared_Var_File_Entry,
Name => Shared_Var_File_Entry_Ptr);
- procedure Free is new Unchecked_Deallocation
+ procedure Free is new Ada.Unchecked_Deallocation
(Object => File_Stream_Type'Class,
Name => File_Stream_Access);
function To_AFCB_Ptr is
- new Unchecked_Conversion (SIO.File_Type, FCB.AFCB_Ptr);
+ new Ada.Unchecked_Conversion (SIO.File_Type, FCB.AFCB_Ptr);
LRU_Head : Shared_Var_File_Entry_Ptr;
LRU_Tail : Shared_Var_File_Entry_Ptr;
-- created entry is returned, after first moving it to the head of
-- the LRU chain. If not, then null is returned.
+ function Shared_Var_ROpen (Var : String) return SIO.Stream_Access;
+ -- As described above, this routine returns null if the
+ -- corresponding shared storage does not exist, and otherwise, if
+ -- the storage does exist, a Stream_Access value that references
+ -- the shared storage, ready to read the current value.
+
+ function Shared_Var_WOpen (Var : String) return SIO.Stream_Access;
+ -- As described above, this routine returns a Stream_Access value
+ -- that references the shared storage, ready to write the new
+ -- value. The storage is created by this call if it does not
+ -- already exist.
+
+ procedure Shared_Var_Close (Var : SIO.Stream_Access);
+ -- This routine signals the end of a read/assign operation. It can
+ -- be useful to embrace a read/write operation between a call to
+ -- open and a call to close which protect the whole operation.
+ -- Otherwise, two simultaneous operations can result in the
+ -- raising of exception Data_Error by setting the access mode of
+ -- the variable in an incorrect mode.
+
---------------
-- Enter_SFE --
---------------
end Shared_Var_Lock;
----------------------
+ -- Shared_Var_Procs --
+ ----------------------
+
+ package body Shared_Var_Procs is
+
+ use type SIO.Stream_Access;
+
+ ----------
+ -- Read --
+ ----------
+
+ procedure Read is
+ S : SIO.Stream_Access := null;
+ begin
+ S := Shared_Var_ROpen (Full_Name);
+ if S /= null then
+ Typ'Read (S, V);
+ Shared_Var_Close (S);
+ end if;
+ end Read;
+
+ ------------
+ -- Write --
+ ------------
+
+ procedure Write is
+ S : SIO.Stream_Access := null;
+ begin
+ S := Shared_Var_WOpen (Full_Name);
+ Typ'Write (S, V);
+ Shared_Var_Close (S);
+ return;
+ end Write;
+
+ end Shared_Var_Procs;
+
+ ----------------------
-- Shared_Var_ROpen --
----------------------
-- Error if we cannot create the file
when others =>
- Ada.Exceptions.Raise_Exception
- (Program_Error'Identity,
- "Cannot create shared variable file for """ &
- S & '"'); -- "
+ raise Program_Error with
+ "Cannot create shared variable file for """ & S & '"';
end;
end;
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