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Diffstat (limited to 'gcc/ada/5zintman.ads')
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1 files changed, 123 insertions, 0 deletions
diff --git a/gcc/ada/5zintman.ads b/gcc/ada/5zintman.ads new file mode 100644 index 00000000000..b0a4c3c5bda --- /dev/null +++ b/gcc/ada/5zintman.ads @@ -0,0 +1,123 @@ +------------------------------------------------------------------------------ +-- -- +-- 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 is the VxWorks 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. + +-- 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; + + subtype Signal_ID is Interrupt_ID + range 0 .. Interfaces.C."-" (System.OS_Interface.NSIG, 1); + + 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 + -- 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. + + 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 + -- 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; |