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1994-05-19
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5KB
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145 lines
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . T A S K _ S P E C I F I C _ D A T A --
-- --
-- B o d y --
-- --
-- $Revision: 1.3 $ --
-- --
-- Copyright (c) 1992,1993,1994 NYU, All Rights Reserved --
-- --
-- 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- --
-- 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, 675 Mass Ave, Cambridge, MA 02139, USA. --
-- --
------------------------------------------------------------------------------
with System.Secondary_Stack;
with Unchecked_Conversion;
with Unchecked_Deallocation;
with System.Tasking_Soft_Links; use System.Tasking_Soft_Links;
pragma Elaborate (System.Secondary_Stack);
-- This pragma elaborate is required to ensure that the body of package
-- System.Secondary_Stack has been elaborated, so that procedure SS_Init
-- can be called from the elaboration routine of our package body. Note
-- that replacing this by Elaborate_All does not work, since we have
-- carefully arranged that SS_Init does not call us indirectly, but
-- other subprograms in Secondary_Stack do call routines in this package,
-- so an elaboration circularity would result.
package body System.Task_Specific_Data is
type TSD is record
Jmpbuf_Address : Address := Null_Address;
GNAT_Exception : Address := Null_Address;
Sec_Stack_Addr : Address := Null_Address;
end record;
type TSD_Ptr is access TSD;
function From_Address is new
Unchecked_Conversion (Address, TSD_Ptr);
function To_Address is new
Unchecked_Conversion (TSD_Ptr, Address);
------------------------
-- Get_Jmpbuf_Address --
------------------------
function Get_Jmpbuf_Address return Address is
begin
return From_Address (Get_TSD_Address (True)).Jmpbuf_Address;
end Get_Jmpbuf_Address;
------------------------
-- Set_Jmpbuf_Address --
------------------------
procedure Set_Jmpbuf_Address (Addr : Address) is
begin
From_Address (Get_TSD_Address (True)).Jmpbuf_Address := Addr;
end Set_Jmpbuf_Address;
------------------------
-- Get_GNAT_Exception --
------------------------
function Get_GNAT_Exception return Address is
begin
return From_Address (Get_TSD_Address (True)).GNAT_Exception;
end Get_GNAT_Exception;
------------------------
-- Set_GNAT_Exception --
------------------------
procedure Set_GNAT_Exception (Addr : Address) is
begin
From_Address (Get_TSD_Address (True)).GNAT_Exception := Addr;
end Set_GNAT_Exception;
------------------------
-- Get_Sec_Stack_Addr --
------------------------
function Get_Sec_Stack_Addr return Address is
begin
return From_Address (Get_TSD_Address (True)).Sec_Stack_Addr;
end Get_Sec_Stack_Addr;
------------------------
-- Set_Sec_Stack_Addr --
------------------------
procedure Set_Sec_Stack_Addr (Addr : Address) is
begin
From_Address (Get_TSD_Address (True)).Sec_Stack_Addr := Addr;
end Set_Sec_Stack_Addr;
----------------
-- Create_TSD --
----------------
function Create_TSD return Address is
New_TSD : constant TSD_Ptr := new TSD;
begin
System.Secondary_Stack.SS_Init (New_TSD.Sec_Stack_Addr, 10*1024);
-- Allocate 10K secondary stack
return To_Address (New_TSD);
end Create_TSD;
-----------------
-- Destroy_TSD --
-----------------
procedure Destroy_TSD (TSD_Addr : Address) is
Old_TSD : TSD_Ptr := From_Address (TSD_Addr);
procedure Free is new
Unchecked_Deallocation (TSD, TSD_Ptr);
begin
System.Secondary_Stack.SS_Free (Old_TSD.Sec_Stack_Addr);
Free (Old_TSD);
end Destroy_TSD;
begin
-- Intialize the TSD for the non-tasking case
Non_Tasking_TSD := Create_TSD;
end System.Task_Specific_Data;