112 lines
5.8 KiB
Ada
112 lines
5.8 KiB
Ada
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------------------------------------------------------------------------------
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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) 1992-2014, 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 package encapsulates and centralizes information about all uses of
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-- interrupts (or signals), including the target-dependent mapping of
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-- interrupts (or signals) to exceptions.
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-- Unlike the original design, System.Interrupt_Management can only be used
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-- for tasking systems.
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-- PLEASE DO NOT put any subprogram declarations with arguments of type
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-- Interrupt_ID into the visible part of this package. The type Interrupt_ID
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-- is used to derive the type in Ada.Interrupts, and adding more operations
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-- to that type would be illegal according to the Ada Reference Manual. This
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-- is the reason why the signals sets are implemented using visible arrays
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-- 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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-- 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 : Interrupt_ID;
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-- The interrupt that is used to implement task abort if an interrupt is
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-- used for that purpose. This is one of the reserved interrupts.
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Keep_Unmasked : Interrupt_Set := (others => False);
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-- Keep_Unmasked (I) is true iff the interrupt I is one that must be kept
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-- unmasked at all times, except (perhaps) for short critical sections.
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-- This includes interrupts that are mapped to exceptions (see
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-- System.Interrupt_Exceptions.Is_Exception), but may also include
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-- interrupts (e.g. timer) that need to be kept unmasked for other
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-- reasons. Where interrupts are implemented as OS signals, and signal
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-- masking is per-task, the interrupt should be unmasked in ALL TASKS.
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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;
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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.
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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 implementations Interrupt_Mask is represented as a linked list
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procedure Adjust_Context_For_Raise
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(Signo : System.OS_Interface.Signal;
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Ucontext : System.Address);
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pragma Import
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(C, Adjust_Context_For_Raise, "__gnat_adjust_context_for_raise");
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-- Target specific hook performing adjustments to the signal's machine
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-- context, to be called before an exception may be raised from a signal
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-- handler. This service is provided by init.c, together with the
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-- non-tasking signal handler.
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end System.Interrupt_Management;
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