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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) 1991-2009, 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 3, or (at your option) any later ver- --
+-- sion. GNAT 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. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNARL was developed by the GNARL team at Florida State University. --
+-- Extensive contributions were provided by Ada Core Technologies, Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the Alpha/VMS 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.
+
+-- PLEASE DO NOT add any with-clauses to this package
+
+-- 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 below are
+-- implemented as visible arrays rather than functions.)
+
+with System.OS_Interface;
+
+package System.Interrupt_Management is
+ pragma Preelaborate;
+
+ type Interrupt_Mask is limited private;
+
+ type Interrupt_ID is new System.OS_Interface.Signal;
+
+ type Interrupt_Set is array (Interrupt_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;
+ -- Then the initialization code will be portable.
+
+ Abort_Task_Interrupt : Interrupt_ID;
+ -- The interrupt that is used to implement task abort, if an interrupt is
+ -- used for that purpose. This is one of the reserved interrupts.
+
+ Keep_Unmasked : Interrupt_Set := (others => False);
+ -- Keep_Unmasked (I) is true iff the interrupt I is one that must be kept
+ -- unmasked at all times, except (perhaps) for short critical sections.
+ -- This includes interrupts that are mapped to exceptions (see
+ -- System.Interrupt_Exceptions.Is_Exception), but may also include
+ -- interrupts (e.g. timer) that need to be kept unmasked for other
+ -- reasons. Where interrupts are implemented as OS signals, and signal
+ -- masking is per-task, the interrupt 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.
+
+ Keep_Masked : Interrupt_Set := (others => False);
+ -- Keep_Masked (I) is true iff the interrupt I must always be masked.
+ -- Where interrupts are implemented as OS signals, and signal masking is
+ -- per-task, the interrupt should be masked in ALL TASKS. There might not
+ -- be any interrupts in this class, depending on the environment. For
+ -- example, if interrupts are OS signals and signal masking is per-task,
+ -- use of the sigwait operation requires the signal be masked in all tasks.
+
+ 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
+ use type System.OS_Interface.unsigned_long;
+
+ type Interrupt_Mask is new System.OS_Interface.sigset_t;
+
+ -- Interrupts on VMS are implemented with a mailbox. A QIO read is
+ -- registered on the Rcv channel and the interrupt occurs by registering
+ -- a QIO write on the Snd channel. The maximum number of pending
+ -- interrupts is arbitrarily set at 1000. One nice feature of using
+ -- a mailbox is that it is trivially extendable to cross process
+ -- interrupts.
+
+ Rcv_Interrupt_Chan : System.OS_Interface.unsigned_short := 0;
+ Snd_Interrupt_Chan : System.OS_Interface.unsigned_short := 0;
+ Interrupt_Mailbox : Interrupt_ID := 0;
+ Interrupt_Bufquo : System.OS_Interface.unsigned_long :=
+ 1000 * (Interrupt_ID'Size / 8);
+
+end System.Interrupt_Management;