File : s-tasinf-vxworks.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S Y S T E M . T A S K _ I N F O --
6 -- --
7 -- S p e c --
8 -- --
9 -- Copyright (C) 1992-2014, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT 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 -- --
19 -- --
20 -- --
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 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 -- This package contains the definitions and routines associated with the
33 -- implementation and use of the Task_Info pragma. It is specialized
34 -- appropriately for targets that make use of this pragma.
35
36 -- Note: the compiler generates direct calls to this interface, via Rtsfind.
37 -- Any changes to this interface may require corresponding compiler changes.
38
39 -- The functionality in this unit is now provided by the predefined package
40 -- System.Multiprocessors and the CPU aspect. This package is obsolescent.
41
42 -- This is the VxWorks version of this package
43
44 with Interfaces.C;
45
46 package System.Task_Info is
47 pragma Obsolescent (Task_Info, "use System.Multiprocessors and CPU aspect");
48 pragma Preelaborate;
49 pragma Elaborate_Body;
50 -- To ensure that a body is allowed
51
52 -----------------------------------------
53 -- Implementation of Task_Info Feature --
54 -----------------------------------------
55
56 -- The Task_Info pragma:
57
58 -- pragma Task_Info (EXPRESSION);
59
60 -- allows the specification on a task by task basis of a value of type
61 -- System.Task_Info.Task_Info_Type to be passed to a task when it is
62 -- created. The specification of this type, and the effect on the task
63 -- that is created is target dependent.
64
65 -- The Task_Info pragma appears within a task definition (compare the
66 -- definition and implementation of pragma Priority). If no such pragma
67 -- appears, then the value Unspecified_Task_Info is passed. If a pragma
68 -- is present, then it supplies an alternative value. If the argument of
69 -- the pragma is a discriminant reference, then the value can be set on
70 -- a task by task basis by supplying the appropriate discriminant value.
71
72 -- Note that this means that the type used for Task_Info_Type must be
73 -- suitable for use as a discriminant (i.e. a scalar or access type).
74
75 ------------------
76 -- Declarations --
77 ------------------
78
79 subtype Task_Info_Type is Interfaces.C.int;
80 -- This is a CPU number (natural - CPUs are 0-indexed on VxWorks)
81
82 use type Interfaces.C.int;
83
84 Unspecified_Task_Info : constant Task_Info_Type := -1;
85 -- Value passed to task in the absence of a Task_Info pragma
86 -- This value means do not try to set the CPU affinity
87
88 end System.Task_Info;