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1994-05-19
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79 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 --
-- --
-- S p e c --
-- --
-- $Revision: 1.5 $ --
-- --
-- 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. --
-- --
------------------------------------------------------------------------------
-- This package contains an interface for manipulation of task specific data
package System.Task_Specific_Data is
-- The basic approach is that for every task, there is an allocated
-- instance of the type TSD, which is a private type used to represent
-- task specific data.
-- In the non-tasking case, there is one specific instance of the TSD
-- declared statically in this package, and initialized by the package
-- body initialization. Together with the interface mechanism provided
-- in System.Tasking_Soft_Links, this ensures that we can avoid bringing
-- in the tasking stuff unless tasking is actually active.
-- In the tasking case, a TSD is allocated for each task, saved in the
-- TCB, and obtained by calling System.Tasking_Soft_Links.Get_TSD_Address.
Non_Tasking_TSD : Address;
-- A pointer to the TSD allocated for the non-tasking case (this gets
-- fetched by the non-tasking case version of the Get_TSD_Address
-- routine in System.Tasking_Soft_Links.
function Get_Jmpbuf_Address return Address;
procedure Set_Jmpbuf_Address (Addr : Address);
pragma Inline (Get_Jmpbuf_Address);
pragma Inline (Set_Jmpbuf_Address);
-- These routines provide a task specific address used to store the
-- address of the current longjmp/setjmp jump buffer for exception
-- management (under the current scheme which uses longjmp/setjmp)
function Get_GNAT_Exception return Address;
procedure Set_GNAT_Exception (Addr : Address);
pragma Inline (Get_GNAT_Exception);
pragma Inline (Set_GNAT_Exception);
-- These routines provide a task specific address used to temporarily
-- store the address of the current exception during propagation.
function Get_Sec_Stack_Addr return Address;
procedure Set_Sec_Stack_Addr (Addr : Address);
pragma Inline (Get_Sec_Stack_Addr);
pragma Inline (Set_Sec_Stack_Addr);
-- These routines provide a task specific address used to reference
-- the currently allocated secondary stack.
function Create_TSD return Address;
-- Called from GNULLI when a new thread is created to allocate a new
-- TSD for the task an return a pointer to this allocated TSD. This
-- call also performs any required initialization of the TSD.
procedure Destroy_TSD (TSD_Addr : Address);
-- Called from GNULLI just before a thread is destroyed to release
-- the storage for the TSD, after performing any required finalization.
end System.Task_Specific_Data;