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authorRichard Kenner <kenner@gcc.gnu.org>2001-10-02 10:30:19 -0400
committerRichard Kenner <kenner@gcc.gnu.org>2001-10-02 10:30:19 -0400
commitcacbc3505bac280b8db4f7d08a4a4b44ab69c0be (patch)
tree86d33ed164722c539e5c03eb27ae96b8b7667e75 /gcc/ada/s-tataat.adb
parent19235870adf79a3422aed017819c537f1d1375ac (diff)
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New Language: Ada
From-SVN: r45957
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+------------------------------------------------------------------------------
+-- --
+-- 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: 1.14 $
+-- --
+-- 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;