------------------------------------------------------------------------------
-- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- 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) 1992-2003 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2009, 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 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
+-- 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. 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, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- 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. --
+-- 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 VxWorks version of this package.
+-- 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
-- Unlike the original design, System.Interrupt_Management can only
-- be used for tasking systems.
--- PLEASE DO NOT remove the Elaborate_Body pragma from this package.
--- Elaboration of this package should happen early, as most other
--- initializations depend on it. Forcing immediate elaboration of
--- the body also helps to enforce the design assumption that this
--- is a second-level package, just one level above System.OS_Interface
--- with no cross-dependencies.
-
-- 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.
+-- sets are implemented 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 Elaborate_Body;
+ pragma Preelaborate;
type Interrupt_Mask is limited private;
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
+ -- 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 abortion if
- -- an interrupt is used for that purpose. This is one of the
- -- reserved signals.
+ Abort_Task_Interrupt : 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
+ -- 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 abortion, or used to implement time delays.
+ -- 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;
- -- On systems where there is no signal inheritance between tasks (e.g
- -- VxWorks, GNU/LinuxThreads), this procedure is used to initialize
- -- interrupts handling in each task. Otherwise this function should
- -- only be called by initialize in this package body.
+ -- 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 (only the first call has any effect).
private
type Interrupt_Mask is new System.OS_Interface.sigset_t;
- -- In some implementation Interrupt_Mask can be represented
- -- as a linked list.
+ -- In some implementation Interrupt_Mask can be represented as a linked
+ -- list.
end System.Interrupt_Management;
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