gcc/ada/s-tataat.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --         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      --
   6 --                                                                          --
   7 --                                  B o d y                                 --
   8 --                                                                          --
   9 --          Copyright (C) 2014-2015, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNARL was developed by the GNARL team at Florida State University.       --
  28 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 with System.Parameters; use System.Parameters;
  33 with System.Tasking.Initialization; use System.Tasking.Initialization;
  34 with System.Task_Primitives.Operations;
  35
  36 package body System.Tasking.Task_Attributes is
  37
  38    package STPO renames System.Task_Primitives.Operations;
  39
  40    type Index_Info is record
  41       Used : Boolean;
  42       --  Used is True if a given index is used by an instantiation of
  43       --  Ada.Task_Attributes, False otherwise.
  44
  45       Require_Finalization : Boolean;
  46       --  Require_Finalization is True if the attribute requires finalization
  47    end record;
  48
  49    Index_Array : array (1 .. Max_Attribute_Count) of Index_Info :=
  50                    (others => (False, False));
  51
  52    --  Note that this package will use an efficient implementation with no
  53    --  locks and no extra dynamic memory allocation if Attribute can fit in a
  54    --  System.Address type and Initial_Value is 0 (or null for an access type).
  55
  56    function Next_Index (Require_Finalization : Boolean) return Integer is
  57       Self_Id : constant Task_Id := STPO.Self;
  58
  59    begin
  60       Task_Lock (Self_Id);
  61
  62       for J in Index_Array'Range loop
  63          if not Index_Array (J).Used then
  64             Index_Array (J).Used := True;
  65             Index_Array (J).Require_Finalization := Require_Finalization;
  66             Task_Unlock (Self_Id);
  67             return J;
  68          end if;
  69       end loop;
  70
  71       Task_Unlock (Self_Id);
  72       raise Storage_Error with "Out of task attributes";
  73    end Next_Index;
  74
  75    --------------
  76    -- Finalize --
  77    --------------
  78
  79    procedure Finalize (Index : Integer) is
  80       Self_Id : constant Task_Id := STPO.Self;
  81    begin
  82       pragma Assert (Index in Index_Array'Range);
  83       Task_Lock (Self_Id);
  84       Index_Array (Index).Used := False;
  85       Task_Unlock (Self_Id);
  86    end Finalize;
  87
  88    --------------------------
  89    -- Require_Finalization --
  90    --------------------------
  91
  92    function Require_Finalization (Index : Integer) return Boolean is
  93    begin
  94       pragma Assert (Index in Index_Array'Range);
  95       return Index_Array (Index).Require_Finalization;
  96    end Require_Finalization;
  97
  98 end System.Tasking.Task_Attributes;