gcc/ada/s-tpopsp-vxworks.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --    S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S .   --
   6 --                             S P E C I F I C                              --
   7 --                                                                          --
   8 --                                 B o d y                                  --
   9 --                                                                          --
  10 --         Copyright (C) 1992-2005, Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  20 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  21 -- Boston, MA 02110-1301, USA.                                              --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNARL was developed by the GNARL team at Florida State University.       --
  31 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  This is a VxWorks version of this package where foreign threads are
  36 --  recognized.
  37
  38 separate (System.Task_Primitives.Operations)
  39 package body Specific is
  40
  41    ATCB_Key : aliased System.Address := System.Null_Address;
  42    --  Key used to find the Ada Task_Id associated with a thread
  43
  44    ATCB_Key_Addr : System.Address := ATCB_Key'Address;
  45    pragma Export (Ada, ATCB_Key_Addr, "__gnat_ATCB_key_addr");
  46    --  Exported to support the temporary AE653 task registration
  47    --  implementation. This mechanism is used to minimize impact on other
  48    --  targets.
  49
  50    ------------
  51    -- Delete --
  52    ------------
  53
  54    procedure Delete is
  55       Result : STATUS;
  56    begin
  57       Result := taskVarDelete (taskIdSelf, ATCB_Key'Access);
  58       pragma Assert (Result /= ERROR);
  59    end Delete;
  60
  61    ----------------
  62    -- Initialize --
  63    ----------------
  64
  65    procedure Initialize is
  66    begin
  67       null;
  68    end Initialize;
  69
  70    -------------------
  71    -- Is_Valid_Task --
  72    -------------------
  73
  74    function Is_Valid_Task return Boolean is
  75    begin
  76       return taskVarGet (taskIdSelf, ATCB_Key'Access) /= ERROR;
  77    end Is_Valid_Task;
  78
  79    ---------
  80    -- Set --
  81    ---------
  82
  83    procedure Set (Self_Id : Task_Id) is
  84       Result : STATUS;
  85
  86    begin
  87       if taskVarGet (0, ATCB_Key'Access) = ERROR then
  88          Result := taskVarAdd (0, ATCB_Key'Access);
  89          pragma Assert (Result = OK);
  90       end if;
  91
  92       ATCB_Key := To_Address (Self_Id);
  93    end Set;
  94
  95    ----------
  96    -- Self --
  97    ----------
  98
  99    function Self return Task_Id is
 100    begin
 101       return To_Task_Id (ATCB_Key);
 102    end Self;
 103
 104 end Specific;