| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNU ADA 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. -- |
| -- -- |
| -- 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- -- |
| -- 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. -- |
| -- -- |
| -- 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. -- |
| -- -- |
| -- GNARL was developed by the GNARL team at Florida State University. -- |
| -- Extensive contributions were provided by Ada Core Technologies, Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This package encapsulates and centralizes information about all |
| -- uses of interrupts (or signals), including the target-dependent |
| -- mapping of interrupts (or signals) to exceptions. |
| |
| -- 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. |
| |
| with System.OS_Interface; |
| -- used for sigset_t |
| |
| with Interfaces.C; |
| -- used for int |
| |
| package System.Interrupt_Management is |
| |
| pragma Elaborate_Body; |
| |
| type Interrupt_Mask is limited private; |
| |
| type Interrupt_ID is new Interfaces.C.int |
| range 0 .. System.OS_Interface.Max_Interrupt; |
| |
| 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; |
| -- and 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. |
| |
| Keep_Unmasked : Interrupt_Set := (others => False); |
| -- Keep_Unmasked (I) is true iff the interrupt I is one that must |
| -- 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. |
| |
| 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. |
| |
| private |
| type Interrupt_Mask is new System.OS_Interface.sigset_t; |
| -- In some implementation Interrupt_Mask can be represented |
| -- as a linked list. |
| |
| end System.Interrupt_Management; |
