File : s-intman-vxworks.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
4 -- --
5 -- S Y S T E M . I N T E R R U P T _ M A N A G E M E N T --
6 -- --
7 -- S p e c --
8 -- --
9 -- Copyright (C) 1992-2010, 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 -- --
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 -- 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 the VxWorks version of this package
33
34 -- This package encapsulates and centralizes information about all
35 -- uses of interrupts (or signals), including the target-dependent
36 -- mapping of interrupts (or signals) to exceptions.
37
38 -- Unlike the original design, System.Interrupt_Management can only
39 -- be used for tasking systems.
40
41 -- PLEASE DO NOT put any subprogram declarations with arguments of
42 -- type Interrupt_ID into the visible part of this package. The type
43 -- Interrupt_ID is used to derive the type in Ada.Interrupts, and
44 -- adding more operations to that type would be illegal according
45 -- to the Ada Reference Manual. This is the reason why the signals
46 -- sets are implemented using visible arrays rather than functions.
47
48 with System.OS_Interface;
49
50 with Interfaces.C;
51
52 package System.Interrupt_Management is
53 pragma Preelaborate;
54
55 type Interrupt_Mask is limited private;
56
57 type Interrupt_ID is new Interfaces.C.int
58 range 0 .. System.OS_Interface.Max_Interrupt;
59
60 type Interrupt_Set is array (Interrupt_ID) of Boolean;
61
62 subtype Signal_ID is Interrupt_ID range 0 .. System.OS_Interface.NSIG - 1;
63
64 type Signal_Set is array (Signal_ID) of Boolean;
65
66 -- The following objects serve as constants, but are initialized in the
67 -- body to aid portability. This permits us to use more portable names for
68 -- interrupts, where distinct names may map to the same interrupt ID
69 -- value.
70
71 -- For example, suppose SIGRARE is a signal that is not defined on all
72 -- systems, but is always reserved when it is defined. If we have the
73 -- convention that ID zero is not used for any "real" signals, and SIGRARE
74 -- = 0 when SIGRARE is not one of the locally supported signals, we can
75 -- write:
76 -- Reserved (SIGRARE) := True;
77 -- and the initialization code will be portable.
78
79 Abort_Task_Interrupt : Signal_ID;
80 -- The signal that is used to implement task abort if an interrupt is used
81 -- for that purpose. This is one of the reserved signals.
82
83 Reserve : Interrupt_Set := (others => False);
84 -- Reserve (I) is true iff the interrupt I is one that cannot be permitted
85 -- to be attached to a user handler. The possible reasons are many. For
86 -- example, it may be mapped to an exception used to implement task abort,
87 -- or used to implement time delays.
88
89 procedure Initialize_Interrupts;
90 pragma Import (C, Initialize_Interrupts, "__gnat_install_handler");
91 -- Under VxWorks, there is no signal inheritance between tasks.
92 -- This procedure is used to initialize signal-to-exception mapping in
93 -- each task.
94
95 procedure Initialize;
96 -- Initialize the various variables defined in this package. This procedure
97 -- must be called before accessing any object from this package and can be
98 -- called multiple times (only the first call has any effect).
99
100 private
101 type Interrupt_Mask is new System.OS_Interface.sigset_t;
102 -- In some implementation Interrupt_Mask can be represented as a linked
103 -- list.
104
105 end System.Interrupt_Management;