New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45957 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 121 insertions, 0 deletions

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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      --
+--                                                                          --
+--                                  S p e c                                 --
+--                                                                          --
+--                             $Revision: 1.9 $
+--                                                                          --
+--             Copyright (C) 1995-2000 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).                                  --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This package provides support for the body of Ada.Task_Attributes.
+
+with Ada.Finalization;
+--  used for Limited_Controlled
+
+with System.Storage_Elements;
+--  used for Integer_Address
+
+package System.Tasking.Task_Attributes is
+
+   type Attribute is new Integer;
+   --  A stand-in for the generic formal type of Ada.Task_Attributes
+   --  in the following declarations.
+
+   type Node;
+   type Access_Node is access all Node;
+   type Dummy_Wrapper;
+   type Access_Dummy_Wrapper is access all Dummy_Wrapper;
+
+   type Deallocator is access procedure (P : in out Access_Node);
+   --  Called to deallocate an Wrapper. P is a pointer to a Node within.
+
+   type Instance;
+
+   type Access_Instance is access all Instance;
+
+   type Instance is new Ada.Finalization.Limited_Controlled with record
+      Deallocate    : Deallocator;
+      Initial_Value : aliased System.Storage_Elements.Integer_Address;
+
+      Index : Direct_Index;
+      --  The index of the TCB location used by this instantiation,
+      --  if it is stored in the TCB, otherwise zero.
+
+      Next : Access_Instance;
+      --  Next instance in All_Attributes list.
+   end record;
+
+   procedure Finalize (X : in out Instance);
+
+   type Node is record
+      Wrapper  : Access_Dummy_Wrapper;
+      Instance : Access_Instance;
+      Next     : Access_Node;
+   end record;
+
+   --  The following type is a stand-in for the actual
+   --  wrapper type, which is different for each instantiation
+   --  of Ada.Task_Attributes.
+
+   type Dummy_Wrapper is record
+      Noed : aliased Node;
+
+      Value : aliased Attribute;
+      --  The generic formal type, may be controlled
+   end record;
+
+   In_Use : Direct_Index_Vector := 0;
+   --  is True for direct indices that are already used.
+
+   All_Attributes : Access_Instance;
+   --  A linked list of all indirectly access attributes,
+   --  which includes all those that require finalization.
+
+   All_Attrs_L : aliased System.Task_Primitives.RTS_Lock;
+   --  Protects In_Use, Next_Indirect_Index, and All_Attributes.
+   --  Deadlock prevention order of locking:
+   --    1) All_Attrs_L
+   --    2) All_Tasks_L
+   --    3) any TCB.L
+
+   procedure Initialize_Attributes (T : Task_ID);
+   --  Initialize all attributes created via Ada.Task_Attributes for T.
+   --  This must be called by the creator of the task, inside Create_Task,
+   --  via soft-link Initialize_Attributes_Link. On entry, abortion must
+   --  be deferred and the caller must hold no locks
+
+   procedure Finalize_Attributes (T : Task_ID);
+   --  Finalize all attributes created via Ada.Task_Attributes for T.
+   --  This is to be called by the task after it is marked as terminated
+   --  (and before it actually dies), inside Vulnerable_Free_Task, via the
+   --  soft-link Finalize_Attributes_Link. On entry, abortion must be deferred
+   --  and T.L must be write-locked.
+
+end System.Tasking.Task_Attributes;