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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
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--                                                                          --
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--            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         --
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--                                                                          --
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--                                  S p e c                                 --
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--                                                                          --
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--          Copyright (C) 1992-2010, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNARL is free software; you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNARL was developed by the GNARL team at Florida State University.       --
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-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This is the VxWorks version of this package
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--  This package encapsulates and centralizes information about all
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--  uses of interrupts (or signals), including the target-dependent
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--  mapping of interrupts (or signals) to exceptions.
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--  Unlike the original design, System.Interrupt_Management can only
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--  be used for tasking systems.
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--  PLEASE DO NOT put any subprogram declarations with arguments of
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--  type Interrupt_ID into the visible part of this package. The type
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--  Interrupt_ID is used to derive the type in Ada.Interrupts, and
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--  adding more operations to that type would be illegal according
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--  to the Ada Reference Manual. This is the reason why the signals
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--  sets are implemented using visible arrays rather than functions.
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with System.OS_Interface;
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with Interfaces.C;
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package System.Interrupt_Management is
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   pragma Preelaborate;
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   type Interrupt_Mask is limited private;
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   type Interrupt_ID is new Interfaces.C.int
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     range 0 .. System.OS_Interface.Max_Interrupt;
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   type Interrupt_Set is array (Interrupt_ID) of Boolean;
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   subtype Signal_ID is Interrupt_ID range 0 .. System.OS_Interface.NSIG - 1;
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   type Signal_Set is array (Signal_ID) of Boolean;
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   --  The following objects serve as constants, but are initialized in the
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   --  body to aid portability. This permits us to use more portable names for
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   --  interrupts, where distinct names may map to the same interrupt ID
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   --  value.
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   --  For example, suppose SIGRARE is a signal that is not defined on all
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   --  systems, but is always reserved when it is defined. If we have the
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   --  convention that ID zero is not used for any "real" signals, and SIGRARE
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   --  = 0 when SIGRARE is not one of the locally supported signals, we can
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   --  write:
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   --     Reserved (SIGRARE) := True;
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   --  and the initialization code will be portable.
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   Abort_Task_Interrupt : Signal_ID;
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   --  The signal that is used to implement task abort if an interrupt is used
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   --  for that purpose. This is one of the reserved signals.
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   Reserve : Interrupt_Set := (others => False);
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   --  Reserve (I) is true iff the interrupt I is one that cannot be permitted
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   --  to be attached to a user handler. The possible reasons are many. For
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   --  example, it may be mapped to an exception used to implement task abort,
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   --  or used to implement time delays.
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   procedure Initialize_Interrupts;
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   pragma Import (C, Initialize_Interrupts, "__gnat_install_handler");
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   --  Under VxWorks, there is no signal inheritance between tasks.
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   --  This procedure is used to initialize signal-to-exception mapping in
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   --  each task.
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   procedure Initialize;
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   --  Initialize the various variables defined in this package. This procedure
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   --  must be called before accessing any object from this package and can be
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   --  called multiple times (only the first call has any effect).
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private
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   type Interrupt_Mask is new System.OS_Interface.sigset_t;
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   --  In some implementation Interrupt_Mask can be represented as a linked
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   --  list.
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end System.Interrupt_Management;

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