gcc/ada/s-tpoaal.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --             SYSTEM.TASK_PRIMITIVES.OPERATIONS.ATCB_ALLOCATION            --
   6 --                                                                          --
   7 --                                  B o d y                                 --
   8 --                                                                          --
   9 --             Copyright (C) 2011, Free Software Foundation, Inc.           --
  10 --                                                                          --
  11 -- GNARL 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 Ada.Unchecked_Deallocation;
  33
  34 separate (System.Task_Primitives.Operations)
  35 package body ATCB_Allocation is
  36
  37    ---------------
  38    -- Free_ATCB --
  39    ---------------
  40
  41    procedure Free_ATCB (T : Task_Id) is
  42       Tmp     : Task_Id := T;
  43       Is_Self : constant Boolean := T = Self;
  44
  45       procedure Free is new
  46         Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
  47
  48    begin
  49       if Is_Self then
  50          declare
  51             Local_ATCB : aliased Ada_Task_Control_Block (0);
  52             --  Create a dummy ATCB and initialize it minimally so that "Free"
  53             --  can still call Self and Defer/Undefer_Abort after Tmp is freed
  54             --  by the underlying memory management library.
  55
  56          begin
  57             Local_ATCB.Common.LL.Thread        := T.Common.LL.Thread;
  58             Local_ATCB.Common.Current_Priority := T.Common.Current_Priority;
  59
  60             Specific.Set (Local_ATCB'Unchecked_Access);
  61             Free (Tmp);
  62
  63             --  Note: it is assumed here that for all platforms, Specific.Set
  64             --  deletes the task specific information if passed a null value.
  65
  66             Specific.Set (null);
  67          end;
  68
  69       else
  70          Free (Tmp);
  71       end if;
  72    end Free_ATCB;
  73
  74    --------------
  75    -- New_ATCB --
  76    --------------
  77
  78    function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
  79    begin
  80       return new Ada_Task_Control_Block (Entry_Num);
  81    end New_ATCB;
  82
  83 end ATCB_Allocation;