+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
--- --
--- 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 --
--- --
--- B o d y --
--- --
--- $Revision: 1.1 $
--- --
--- Copyright (C) 1995-1999 Florida State University --
--- --
--- GNARL 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. GNARL 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 GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- 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. --
--- --
--- GNARL was developed by the GNARL team at Florida State University. It is --
--- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
--- State University (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
-with System.Storage_Elements;
--- used for To_Address
-
-with System.Task_Primitives.Operations;
--- used for Write_Lock
--- Unlock
--- Lock/Unlock_All_Tasks_List
-
-with System.Tasking.Initialization;
--- used for Defer_Abort
--- Undefer_Abort
-
-with Unchecked_Conversion;
-
-package body System.Tasking.Task_Attributes is
-
- use Task_Primitives.Operations,
- System.Tasking.Initialization;
-
- function To_Access_Node is new Unchecked_Conversion
- (Access_Address, Access_Node);
- -- Tetch pointer to indirect attribute list
-
- function To_Access_Address is new Unchecked_Conversion
- (Access_Node, Access_Address);
- -- Store pointer to indirect attribute list
-
- --------------
- -- Finalize --
- --------------
-
- procedure Finalize (X : in out Instance) is
- Q, To_Be_Freed : Access_Node;
-
- begin
- Defer_Abortion;
- Write_Lock (All_Attrs_L'Access);
-
- -- Remove this instantiation from the list of all instantiations.
-
- declare
- P : Access_Instance;
- Q : Access_Instance := All_Attributes;
-
- begin
- while Q /= null and then Q /= X'Unchecked_Access loop
- P := Q; Q := Q.Next;
- end loop;
-
- pragma Assert (Q /= null);
-
- if P = null then
- All_Attributes := Q.Next;
- else
- P.Next := Q.Next;
- end if;
- end;
-
- if X.Index /= 0 then
-
- -- Free location of this attribute, for reuse.
-
- In_Use := In_Use and not (2**Natural (X.Index));
-
- -- There is no need for finalization in this case,
- -- since controlled types are too big to fit in the TCB.
-
- else
- -- Remove nodes for this attribute from the lists of
- -- all tasks, and deallocate the nodes.
- -- Deallocation does finalization, if necessary.
-
- Lock_All_Tasks_List;
-
- declare
- C : System.Tasking.Task_ID := All_Tasks_List;
- P : Access_Node;
-
- begin
- while C /= null loop
- Write_Lock (C);
-
- Q := To_Access_Node (C.Indirect_Attributes);
- while Q /= null
- and then Q.Instance /= X'Unchecked_Access
- loop
- P := Q;
- Q := Q.Next;
- end loop;
-
- if Q /= null then
- if P = null then
- C.Indirect_Attributes := To_Access_Address (Q.Next);
- else
- P.Next := Q.Next;
- end if;
-
- -- Can't Deallocate now since we are holding the All_Tasks_L
- -- lock.
-
- Q.Next := To_Be_Freed;
- To_Be_Freed := Q;
- end if;
-
- Unlock (C);
- C := C.Common.All_Tasks_Link;
- end loop;
- end;
-
- Unlock_All_Tasks_List;
- end if;
-
- Unlock (All_Attrs_L'Access);
-
- while To_Be_Freed /= null loop
- Q := To_Be_Freed;
- To_Be_Freed := To_Be_Freed.Next;
- X.Deallocate.all (Q);
- end loop;
-
- Undefer_Abortion;
-
- exception
- when others => null;
- pragma Assert (False,
- "Exception in task attribute instance finalization");
- end Finalize;
-
- -------------------------
- -- Finalize Attributes --
- -------------------------
-
- -- This is to be called just before the ATCB is deallocated.
- -- It relies on the caller holding T.L write-lock on entry.
-
- procedure Finalize_Attributes (T : Task_ID) is
- P : Access_Node;
- Q : Access_Node := To_Access_Node (T.Indirect_Attributes);
-
- begin
- -- Deallocate all the indirect attributes of this task.
-
- while Q /= null loop
- P := Q;
- Q := Q.Next; P.Instance.Deallocate.all (P);
- end loop;
-
- T.Indirect_Attributes := null;
-
- exception
- when others => null;
- pragma Assert (False,
- "Exception in per-task attributes finalization");
- end Finalize_Attributes;
-
- ---------------------------
- -- Initialize Attributes --
- ---------------------------
-
- -- This is to be called by System.Task_Stages.Create_Task.
- -- It relies on their being no concurrent access to this TCB,
- -- so it does not defer abortion or lock T.L.
-
- procedure Initialize_Attributes (T : Task_ID) is
- P : Access_Instance;
-
- begin
- Write_Lock (All_Attrs_L'Access);
-
- -- Initialize all the direct-access attributes of this task.
-
- P := All_Attributes;
- while P /= null loop
- if P.Index /= 0 then
- T.Direct_Attributes (P.Index) :=
- System.Storage_Elements.To_Address (P.Initial_Value);
- end if;
-
- P := P.Next;
- end loop;
-
- Unlock (All_Attrs_L'Access);
-
- exception
- when others => null;
- pragma Assert (False);
- end Initialize_Attributes;
-
-end System.Tasking.Task_Attributes;
projects / msp430-gcc.git / blobdiff