s-shasto.ads, [...]: Move Shared_Var_ROpen...

2008-08-22  Kevin Pouget  <pouget@adacore.com>

	* s-shasto.ads, s-shasto.adb: Move Shared_Var_ROpen, Shared_Var_WOpen and
	Shared_Var_Close procedure specifications from package spec to package body.

	* rtsfind.ads: Remove RE_Shared_Var_Close, RE_Shared_Var_ROpen,
	RE_Shared_Var_WOpen entries.

	* exp_dist.adb: Update RE_Any_Content_Ptr to RE_Any_Container_Ptr in
	Build_To_Any_Call, Build_TypeCode_Call and Build_From_Any_Call procedures.

From-SVN: r139445

gcc/ada/exp_dist.adb

@@ -8452,7 +8452,7 @@ package body Exp_Dist is
 
             --  Special DSA types
 
-            elsif Is_RTE (U_Type, RE_Any_Content_Ptr) then
+            elsif Is_RTE (U_Type, RE_Any_Container_Ptr) then
                Lib_RE := RE_FA_A;
 
             --  Other (non-primitive) types
@@ -9317,8 +9317,9 @@ package body Exp_Dist is
 
             --  Special DSA types
 
-            elsif Is_RTE (U_Type, RE_Any_Content_Ptr) then
+            elsif Is_RTE (U_Type, RE_Any_Container_Ptr) then
                Lib_RE := RE_TA_A;
+               U_Type := Typ;
 
             elsif U_Type = Underlying_Type (RTE (RE_TypeCode)) then
                --  No corresponding FA_TC ???
@@ -10086,7 +10087,7 @@ package body Exp_Dist is
 
                --  Special DSA types
 
-               elsif Is_RTE (U_Type, RE_Any_Content_Ptr) then
+               elsif Is_RTE (U_Type, RE_Any_Container_Ptr) then
                   Lib_RE := RE_TC_A;
 
                --  Other (non-primitive) types

gcc/ada/rtsfind.ads

@@ -697,7 +697,7 @@ package Rtsfind is
      RE_Get_Local_Partition_Id,          -- System.DSA_Services
      RE_Get_Passive_Partition_Id,        -- System.DSA_Services
 
-     RE_Any_Content_Ptr,                 -- System.DSA_Types
+     RE_Any_Container_Ptr,               -- System.DSA_Types
 
      RE_Register_Exception,              -- System.Exception_Table
 
@@ -1261,11 +1261,8 @@ package Rtsfind is
      RE_SS_Mark,                         -- System.Secondary_Stack
      RE_SS_Release,                      -- System.Secondary_Stack
 
-     RE_Shared_Var_Close,                -- System.Shared_Storage
      RE_Shared_Var_Lock,                 -- System.Shared_Storage
-     RE_Shared_Var_ROpen,                -- System.Shared_Storage
      RE_Shared_Var_Unlock,               -- System.Shared_Storage
-     RE_Shared_Var_WOpen,                -- System.Shared_Storage
      RE_Shared_Var_Procs,                -- System.Shared_Storage
 
      RE_Abort_Undefer_Direct,            -- System.Standard_Library
@@ -1854,7 +1851,7 @@ package Rtsfind is
      RE_Get_Local_Partition_Id           => System_DSA_Services,
      RE_Get_Passive_Partition_Id         => System_DSA_Services,
 
-     RE_Any_Content_Ptr                  => System_DSA_Types,
+     RE_Any_Container_Ptr                => System_DSA_Types,
 
      RE_Register_Exception               => System_Exception_Table,
 
@@ -2418,11 +2415,8 @@ package Rtsfind is
      RE_SS_Pool                          => System_Secondary_Stack,
      RE_SS_Release                       => System_Secondary_Stack,
 
-     RE_Shared_Var_Close                 => System_Shared_Storage,
      RE_Shared_Var_Lock                  => System_Shared_Storage,
-     RE_Shared_Var_ROpen                 => System_Shared_Storage,
      RE_Shared_Var_Unlock                => System_Shared_Storage,
-     RE_Shared_Var_WOpen                 => System_Shared_Storage,
      RE_Shared_Var_Procs                 => System_Shared_Storage,
 
      RE_Abort_Undefer_Direct             => System_Standard_Library,

gcc/ada/s-shasto.adb

@@ -33,6 +33,7 @@
 
 with Ada.IO_Exceptions;
 with Ada.Streams;
+with Ada.Streams.Stream_IO;
 
 with System.Global_Locks;
 with System.Soft_Links;
@@ -55,6 +56,8 @@ 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 Ada.Unchecked_Deallocation
      (Object => String, Name => String_Access);
@@ -168,6 +171,26 @@ package body System.Shared_Storage is
    --  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 --
    ---------------

gcc/ada/s-shasto.ads

@@ -82,30 +82,16 @@
 --    For each shared variable, var, an instantiation of the below generic
 --    package is created which provides Read and Write supporting procedures.
 
---    The routine Shared_Var_ROpen in package System.Shared_Storage
---    either returns null if the storage does not exist, or otherwise a
---    Stream_Access value that references the corresponding shared
---    storage, ready to read the current value.
-
---    The routine Shared_Var_WOpen in package System.Shared_Storage
---    returns a Stream_Access value that references the corresponding
---    shared storage, ready to write the new value.
-
---    Note that there is no general synchronization for these storage
---    read and write operations, since it is assumed that a correctly
---    operating programs will provide appropriate synchronization. In
---    particular, variables can be protected using protected types with
---    no entries.
-
---    The routine Shared_Var_Close is called to indicate the end of a
---    read/write operations. This can be useful even in the context of
---    the GNAT implementation. For instance, when a read operation and a
---    write operation occur at the same time on the same partition, as
---    the same stream is used simultaneously, both operations can
---    terminate abruptly by raising exception Mode_Error because the
---    stream has been opened in read mode and then in write mode and at
---    least used by the read operation. To avoid this unexpected
---    behaviour, we introduce a synchronization at the partition level.
+--    The routine Read in package System.Shared_Storage.Shared_Var_Procs
+--    ensures to assign variable V to the last written value among processes
+--    referencing it. A call to this procedure is generated by the expander
+--    before each read access to the shared variable.
+
+--    The routine Write in package System.Shared_Storage.Shared_Var_Proc
+--    set a new value to the shared variable and, according to the used
+--    implementation, propagate this value among processes referencing it.
+--    A call to this procedure is generated by the expander after each
+--    assignement of the shared varible.
 
 --  Note: a special circuit allows the use of stream attributes Read and
 --  Write for limited types (using the corresponding attribute for the
@@ -150,32 +136,8 @@
 --    These calls to the read and assign routines, as well as the lock
 --    and unlock routines, are inserted by the expander (see exp_smem.adb).
 
-with Ada.Streams.Stream_IO;
-
 package System.Shared_Storage is
 
-   package SIO renames Ada.Streams.Stream_IO;
-
-   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.
-
    procedure Shared_Var_Lock (Var : String);
    --  This procedure claims the shared storage lock. It is used for
    --  protected types in shared passive packages. A call to this
@@ -185,7 +147,7 @@ package System.Shared_Storage is
 
    procedure Shared_Var_Unlock (Var : String);
    --  This procedure releases the shared storage lock obtained by a
-   --  prior call to the Shared_Mem_Lock procedure, and is to be
+   --  prior call to the Shared_Var_Lock procedure, and is to be
    --  generated as the last operation in the body of a protected
    --  subprogram.