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
35separate (System.Task_Primitives.Operations)
36package 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
100end Specific;
101