------------------------------------------------------------------------------
-- --
--- 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) 1991-2003 Free Software Foundation, Inc. --
+-- Copyright (C) 1991-2005 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- --
-- 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. --
+-- 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 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.
--- This is designed to work for both tasking and non-tasking systems,
--- without pulling in any of the tasking support.
-
--- 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-dependences.
-
--- 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.)
+-- 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;
-- used for Signal
-- sigset_t
package System.Interrupt_Management is
-
- pragma Elaborate_Body;
+ pragma Preelaborate;
type Interrupt_Mask is limited private;
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
+ -- 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.
+
+ -- Then the initialization code will be portable
Abort_Task_Interrupt : Interrupt_ID;
- -- The interrupt that is used to implement task abortion,
- -- if an interrupt is used for that purpose.
- -- This is one of the reserved interrupts.
+ -- 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.
+ -- 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 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.
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_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.
+ -- 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.
-private
+ 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;
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);
+ Interrupt_Bufquo : System.OS_Interface.unsigned_long :=
+ 1000 * (Interrupt_ID'Size / 8);
end System.Interrupt_Management;
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