218 lines
7.2 KiB
Ada
218 lines
7.2 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . T A S K I N G . T A S K _ A T T R I B U T E S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1991-1994, Florida State University --
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-- Copyright (C) 1995-2008, AdaCore --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNARL; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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with Ada.Unchecked_Conversion;
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with System.Task_Primitives.Operations;
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with System.Tasking.Initialization;
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package body System.Tasking.Task_Attributes is
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use Task_Primitives.Operations;
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use Tasking.Initialization;
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function To_Access_Address is new Ada.Unchecked_Conversion
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(Access_Node, Access_Address);
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-- Store pointer to indirect attribute list
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--------------
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-- Finalize --
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--------------
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procedure Finalize (X : in out Instance) is
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Q, To_Be_Freed : Access_Node;
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Self_Id : constant Task_Id := Self;
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begin
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-- Defer abort. Note that we use the nestable versions of Defer_Abort
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-- and Undefer_Abort, because abort can already deferred when this is
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-- called during finalization, which would cause an assert failure
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-- in Defer_Abort.
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Defer_Abort_Nestable (Self_Id);
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Lock_RTS;
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-- Remove this instantiation from the list of all instantiations
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declare
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P : Access_Instance;
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Q : Access_Instance := All_Attributes;
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begin
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while Q /= null and then Q /= X'Unchecked_Access loop
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P := Q; Q := Q.Next;
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end loop;
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pragma Assert (Q /= null);
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if P = null then
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All_Attributes := Q.Next;
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else
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P.Next := Q.Next;
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end if;
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end;
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if X.Index /= 0 then
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-- Free location of this attribute, for reuse
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In_Use := In_Use and not (2**Natural (X.Index));
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-- There is no need for finalization in this case, since controlled
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-- types are too big to fit in the TCB.
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else
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-- Remove nodes for this attribute from the lists of all tasks,
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-- and deallocate the nodes. Deallocation does finalization, if
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-- necessary.
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declare
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C : System.Tasking.Task_Id := All_Tasks_List;
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P : Access_Node;
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begin
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while C /= null loop
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Write_Lock (C);
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Q := To_Access_Node (C.Indirect_Attributes);
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while Q /= null
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and then Q.Instance /= X'Unchecked_Access
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loop
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P := Q;
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Q := Q.Next;
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end loop;
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if Q /= null then
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if P = null then
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C.Indirect_Attributes := To_Access_Address (Q.Next);
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else
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P.Next := Q.Next;
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end if;
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-- Can't Deallocate now since we are holding RTS_Lock
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Q.Next := To_Be_Freed;
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To_Be_Freed := Q;
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end if;
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Unlock (C);
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C := C.Common.All_Tasks_Link;
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end loop;
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end;
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end if;
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Unlock_RTS;
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while To_Be_Freed /= null loop
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Q := To_Be_Freed;
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To_Be_Freed := To_Be_Freed.Next;
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X.Deallocate.all (Q);
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end loop;
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Undefer_Abort_Nestable (Self_Id);
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exception
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when others =>
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null;
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pragma Assert (False,
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"Exception in task attribute instance finalization");
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end Finalize;
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-------------------------
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-- Finalize Attributes --
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-------------------------
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-- This is to be called just before the ATCB is deallocated.
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-- It relies on the caller holding T.L write-lock on entry.
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procedure Finalize_Attributes (T : Task_Id) is
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P : Access_Node;
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Q : Access_Node := To_Access_Node (T.Indirect_Attributes);
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begin
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-- Deallocate all the indirect attributes of this task
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while Q /= null loop
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P := Q;
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Q := Q.Next; P.Instance.Deallocate.all (P);
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end loop;
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T.Indirect_Attributes := null;
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exception
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when others =>
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null;
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pragma Assert (False,
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"Exception in per-task attributes finalization");
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end Finalize_Attributes;
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---------------------------
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-- Initialize Attributes --
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---------------------------
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-- This is to be called by System.Tasking.Stages.Create_Task
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procedure Initialize_Attributes (T : Task_Id) is
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P : Access_Instance;
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Self_Id : constant Task_Id := Self;
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begin
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Defer_Abort (Self_Id);
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Lock_RTS;
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-- Initialize all the direct-access attributes of this task
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P := All_Attributes;
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while P /= null loop
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if P.Index /= 0 then
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T.Direct_Attributes (P.Index) :=
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Direct_Attribute_Element
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(System.Storage_Elements.To_Address (P.Initial_Value));
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end if;
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P := P.Next;
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end loop;
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Unlock_RTS;
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Undefer_Abort (Self_Id);
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exception
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when others =>
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null;
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pragma Assert (False);
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end Initialize_Attributes;
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end System.Tasking.Task_Attributes;
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