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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- 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 --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2005 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 2, or (at your option) any later ver- --
-- sion. GNARL 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNARL; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This is the VxWorks version of this package
-- This package encapsulates and centralizes information about all
-- uses of interrupts (or signals), including the target-dependent
-- mapping of interrupts (or signals) to exceptions.
-- Unlike the original design, System.Interrupt_Management can only
-- be used for tasking systems.
-- PLEASE DO NOT put any subprogram declarations with arguments of
-- type Interrupt_ID into the visible part of this package. The type
-- Interrupt_ID is used to derive the type in Ada.Interrupts, and
-- adding more operations to that type would be illegal according
-- to the Ada Reference Manual. This is the reason why the signals
-- sets are implemeneted using visible arrays rather than functions.
with System.OS_Interface;
-- used for sigset_t
with Interfaces.C;
-- used for int
package System.Interrupt_Management is
pragma Preelaborate;
type Interrupt_Mask is limited private;
type Interrupt_ID is new Interfaces.C.int
range 0 .. System.OS_Interface.Max_Interrupt;
type Interrupt_Set is array (Interrupt_ID) of Boolean;
subtype Signal_ID is Interrupt_ID
range 0 .. Interfaces.C."-" (System.OS_Interface.NSIG, 1);
type Signal_Set is array (Signal_ID) of Boolean;
-- The following objects serve as constants, but are initialized in the
-- body to aid portability. This permits us to use more portable names for
-- interrupts, where distinct names may map to the same interrupt ID
-- value.
-- For example, suppose SIGRARE is a signal that is not defined on all
-- systems, but is always reserved when it is defined. If we have the
-- convention that ID zero is not used for any "real" signals, and SIGRARE
-- = 0 when SIGRARE is not one of the locally supported signals, we can
-- write:
-- Reserved (SIGRARE) := true;
-- and the initialization code will be portable.
Abort_Task_Signal : Signal_ID;
-- The signal that is used to implement task abort if an interrupt is used
-- for that purpose. This is one of the reserved signals.
Keep_Unmasked : Signal_Set := (others => False);
-- Keep_Unmasked (I) is true iff the signal I is one that must that must
-- be kept unmasked at all times, except (perhaps) for short critical
-- sections. This includes signals that are mapped to exceptions, but may
-- also include interrupts (e.g. timer) that need to be kept unmasked for
-- other reasons. Where signal masking is per-task, the signal should be
-- unmasked in ALL TASKS.
Reserve : Interrupt_Set := (others => False);
-- Reserve (I) is true iff the interrupt I is one that cannot be permitted
-- to be attached to a user handler. The possible reasons are many. For
-- example, it may be mapped to an exception used to implement task abort,
-- or used to implement time delays.
procedure Initialize_Interrupts;
-- Under VxWorks, there is no signal inheritance between tasks.
-- This procedure is used to initialize signal-to-exception mapping in
-- each task.
procedure Initialize;
-- Initialize the various variables defined in this package.
-- This procedure must be called before accessing any object from this
-- package and can be called multiple times.
private
type Interrupt_Mask is new System.OS_Interface.sigset_t;
-- In some implementation Interrupt_Mask can be represented as a linked
-- list.
end System.Interrupt_Management;
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