gcc/ada/s-tpopsp-vxworks.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --                SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC                --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --         Copyright (C) 1992-2011, 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 --  This is a VxWorks version of this package where foreign threads are
  33 --  recognized. The implementation is based on VxWorks taskVarLib.
  34
  35 separate (System.Task_Primitives.Operations)
  36 package body Specific is
  37
  38    ATCB_Key : aliased System.Address := System.Null_Address;
  39    --  Key used to find the Ada Task_Id associated with a thread
  40
  41    ATCB_Key_Addr : System.Address := ATCB_Key'Address;
  42    pragma Export (Ada, ATCB_Key_Addr, "__gnat_ATCB_key_addr");
  43    --  Exported to support the temporary AE653 task registration
  44    --  implementation. This mechanism is used to minimize impact on other
  45    --  targets.
  46
  47    ----------------
  48    -- Initialize --
  49    ----------------
  50
  51    procedure Initialize is
  52    begin
  53       null;
  54    end Initialize;
  55
  56    -------------------
  57    -- Is_Valid_Task --
  58    -------------------
  59
  60    function Is_Valid_Task return Boolean is
  61    begin
  62       return taskVarGet (taskIdSelf, ATCB_Key'Access) /= ERROR;
  63    end Is_Valid_Task;
  64
  65    ---------
  66    -- Set --
  67    ---------
  68
  69    procedure Set (Self_Id : Task_Id) is
  70       Result : STATUS;
  71
  72    begin
  73       --  If argument is null, destroy task specific data, to make API
  74       --  consistent with other platforms, and thus compatible with the
  75       --  shared version of s-tpoaal.adb.
  76
  77       if Self_Id = null then
  78          Result := taskVarDelete (taskIdSelf, ATCB_Key'Access);
  79          pragma Assert (Result /= ERROR);
  80          return;
  81       end if;
  82
  83       if taskVarGet (0, ATCB_Key'Access) = ERROR then
  84          Result := taskVarAdd (0, ATCB_Key'Access);
  85          pragma Assert (Result = OK);
  86       end if;
  87
  88       ATCB_Key := To_Address (Self_Id);
  89    end Set;
  90
  91    ----------
  92    -- Self --
  93    ----------
  94
  95    function Self return Task_Id is
  96    begin
  97       return To_Task_Id (ATCB_Key);
  98    end Self;
  99
 100 end Specific;