1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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 --
9 -- Copyright (C) 1992-2008, Free Software Foundation, Inc. --
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 2, or (at your option) any later ver- --
14 -- sion. GNARL 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is the VxWorks version of this package
36 -- This package encapsulates and centralizes information about all
37 -- uses of interrupts (or signals), including the target-dependent
38 -- mapping of interrupts (or signals) to exceptions.
40 -- Unlike the original design, System.Interrupt_Management can only
41 -- be used for tasking systems.
43 -- PLEASE DO NOT put any subprogram declarations with arguments of
44 -- type Interrupt_ID into the visible part of this package. The type
45 -- Interrupt_ID is used to derive the type in Ada.Interrupts, and
46 -- adding more operations to that type would be illegal according
47 -- to the Ada Reference Manual. This is the reason why the signals
48 -- sets are implemeneted using visible arrays rather than functions.
50 with System.OS_Interface;
54 package System.Interrupt_Management is
57 type Interrupt_Mask is limited private;
59 type Interrupt_ID is new Interfaces.C.int
60 range 0 .. System.OS_Interface.Max_Interrupt;
62 type Interrupt_Set is array (Interrupt_ID) of Boolean;
64 subtype Signal_ID is Interrupt_ID
65 range 0 .. Interfaces.C."-" (System.OS_Interface.NSIG, 1);
67 type Signal_Set is array (Signal_ID) of Boolean;
69 -- The following objects serve as constants, but are initialized in the
70 -- body to aid portability. This permits us to use more portable names for
71 -- interrupts, where distinct names may map to the same interrupt ID
74 -- For example, suppose SIGRARE is a signal that is not defined on all
75 -- systems, but is always reserved when it is defined. If we have the
76 -- convention that ID zero is not used for any "real" signals, and SIGRARE
77 -- = 0 when SIGRARE is not one of the locally supported signals, we can
79 -- Reserved (SIGRARE) := true;
80 -- and the initialization code will be portable.
82 Abort_Task_Interrupt : Signal_ID;
83 -- The signal that is used to implement task abort if an interrupt is used
84 -- for that purpose. This is one of the reserved signals.
86 Keep_Unmasked : Signal_Set := (others => False);
87 -- Keep_Unmasked (I) is true iff the signal I is one that must that must
88 -- be kept unmasked at all times, except (perhaps) for short critical
89 -- sections. This includes signals that are mapped to exceptions, but may
90 -- also include interrupts (e.g. timer) that need to be kept unmasked for
91 -- other reasons. Where signal masking is per-task, the signal should be
92 -- unmasked in ALL TASKS.
94 Reserve : Interrupt_Set := (others => False);
95 -- Reserve (I) is true iff the interrupt I is one that cannot be permitted
96 -- to be attached to a user handler. The possible reasons are many. For
97 -- example, it may be mapped to an exception used to implement task abort,
98 -- or used to implement time delays.
100 procedure Initialize_Interrupts;
101 -- Under VxWorks, there is no signal inheritance between tasks.
102 -- This procedure is used to initialize signal-to-exception mapping in
105 procedure Initialize;
106 -- Initialize the various variables defined in this package.
107 -- This procedure must be called before accessing any object from this
108 -- package and can be called multiple times.
111 type Interrupt_Mask is new System.OS_Interface.sigset_t;
112 -- In some implementation Interrupt_Mask can be represented as a linked
115 end System.Interrupt_Management;