Subversion Repositories openrisc

------------------------------------------------------------------------------

--                                                                          --

--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --

--                                                                          --

--                SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC                --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--         Copyright (C) 1992-2011, Free Software Foundation, Inc.          --

--                                                                          --

-- 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 3,  or (at your option) any later ver- --

-- sion.  GNAT 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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNARL was developed by the GNARL team at Florida State University.       --

-- Extensive contributions were provided by Ada Core Technologies, Inc.     --

--                                                                          --

------------------------------------------------------------------------------

--  This is a VxWorks version of this package where foreign threads are

--  recognized. The implementation is based on VxWorks taskVarLib.

separate (System.Task_Primitives.Operations)

package body Specific is

   ATCB_Key : aliased System.Address := System.Null_Address;

   --  Key used to find the Ada Task_Id associated with a thread

   ATCB_Key_Addr : System.Address := ATCB_Key'Address;

   pragma Export (Ada, ATCB_Key_Addr, "__gnat_ATCB_key_addr");

   --  Exported to support the temporary AE653 task registration

   --  implementation. This mechanism is used to minimize impact on other

   --  targets.

   ----------------

   -- Initialize --

   ----------------

   procedure Initialize is

   begin

      null;

   end Initialize;

   -------------------

   -- Is_Valid_Task --

   -------------------

   function Is_Valid_Task return Boolean is

   begin

      return taskVarGet (taskIdSelf, ATCB_Key'Access) /= ERROR;

   end Is_Valid_Task;

   ---------

   -- Set --

   ---------

   procedure Set (Self_Id : Task_Id) is

      Result : STATUS;

   begin

      --  If argument is null, destroy task specific data, to make API

      --  consistent with other platforms, and thus compatible with the

      --  shared version of s-tpoaal.adb.

      if Self_Id = null then

         Result := taskVarDelete (taskIdSelf, ATCB_Key'Access);

         pragma Assert (Result /= ERROR);

         return;

      end if;

      if taskVarGet (0, ATCB_Key'Access) = ERROR then

         Result := taskVarAdd (0, ATCB_Key'Access);

         pragma Assert (Result = OK);

      end if;

      ATCB_Key := To_Address (Self_Id);

   end Set;

   ----------

   -- Self --

   ----------

   function Self return Task_Id is

   begin

      return To_Task_Id (ATCB_Key);

   end Self;

end Specific;