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------------------------------------------------------------------------------
-- --
-- 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 --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2004 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.
-- It is likely to need tailoring to fit each operating system
-- and machine architecture.
-- PLEASE DO NOT add any dependences on other packages.
-- This package is designed to work with or without tasking support.
-- See the other warnings in the package specification before making
-- any modifications to this file.
-- Make a careful study of all signals available under the OS,
-- to see which need to be reserved, kept always unmasked,
-- or kept always unmasked.
-- Be on the lookout for special signals that
-- may be used by the thread library.
with Interfaces.C;
with System.OS_Interface;
-- used for various Constants, Signal and types
package body System.Interrupt_Management is
use System.OS_Interface;
use type Interfaces.C.int;
type Signal_List is array (Signal_ID range <>) of Signal_ID;
Exception_Signals : constant Signal_List (1 .. 4) :=
(SIGFPE, SIGILL, SIGSEGV, SIGBUS);
-- Keep these variables global so that they are initialized only once
-- What are "these variables" ???, I see only one
Exception_Action : aliased struct_sigaction;
procedure Map_And_Raise_Exception (signo : Signal);
pragma Import (C, Map_And_Raise_Exception, "__gnat_map_signal");
-- Map signal to Ada exception and raise it. Different versions
-- of VxWorks need different mappings.
-----------------------
-- Local Subprograms --
-----------------------
procedure Notify_Exception (signo : Signal);
-- Identify the Ada exception to be raised using
-- the information when the system received a synchronous signal.
----------------------
-- Notify_Exception --
----------------------
procedure Notify_Exception (signo : Signal) is
Mask : aliased sigset_t;
My_Id : t_id;
Result : int;
pragma Unreferenced (Result);
begin
Result := pthread_sigmask (SIG_SETMASK, null, Mask'Unchecked_Access);
Result := sigdelset (Mask'Access, signo);
Result := pthread_sigmask (SIG_SETMASK, Mask'Unchecked_Access, null);
-- VxWorks will suspend the task when it gets a hardware
-- exception. We take the liberty of resuming the task
-- for the application.
My_Id := taskIdSelf;
if taskIsSuspended (My_Id) /= 0 then
Result := taskResume (My_Id);
end if;
Map_And_Raise_Exception (signo);
end Notify_Exception;
---------------------------
-- Initialize_Interrupts --
---------------------------
-- Since there is no signal inheritance between VxWorks tasks, we need
-- to initialize signal handling in each task.
procedure Initialize_Interrupts is
Result : int;
old_act : aliased struct_sigaction;
begin
for J in Exception_Signals'Range loop
Result :=
sigaction
(Signal (Exception_Signals (J)), Exception_Action'Access,
old_act'Unchecked_Access);
pragma Assert (Result = 0);
end loop;
end Initialize_Interrupts;
begin
declare
mask : aliased sigset_t;
Result : int;
function State (Int : Interrupt_ID) return Character;
pragma Import (C, State, "__gnat_get_interrupt_state");
-- Get interrupt state. Defined in a-init.c
-- The input argument is the interrupt number,
-- and the result is one of the following:
Runtime : constant Character := 'r';
Default : constant Character := 's';
-- 'n' this interrupt not set by any Interrupt_State pragma
-- 'u' Interrupt_State pragma set state to User
-- 'r' Interrupt_State pragma set state to Runtime
-- 's' Interrupt_State pragma set state to System (use "default"
-- system handler)
begin
-- Initialize signal handling
-- Change this if you want to use another signal for task abort.
-- SIGTERM might be a good one.
Abort_Task_Signal := SIGABRT;
Exception_Action.sa_handler := Notify_Exception'Address;
Exception_Action.sa_flags := SA_ONSTACK;
Result := sigemptyset (mask'Access);
pragma Assert (Result = 0);
for J in Exception_Signals'Range loop
Result := sigaddset (mask'Access, Signal (Exception_Signals (J)));
pragma Assert (Result = 0);
end loop;
Exception_Action.sa_mask := mask;
-- Initialize hardware interrupt handling
pragma Assert (Reserve = (Interrupt_ID'Range => False));
-- Check all interrupts for state that requires keeping them reserved
for J in Interrupt_ID'Range loop
if State (J) = Default or else State (J) = Runtime then
Reserve (J) := True;
end if;
end loop;
-- Add exception signals to the set of unmasked signals
for J in Exception_Signals'Range loop
Keep_Unmasked (Exception_Signals (J)) := True;
end loop;
-- The abort signal must also be unmasked
Keep_Unmasked (Abort_Task_Signal) := True;
end;
end System.Interrupt_Management;
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