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------------------------------------------------------------------------------
-- --
-- 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 --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2024, 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 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. --
-- --
-- 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 SuSV3 threads version of this package
-- 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.
-- Since this is a multi target file, the signal <-> exception mapping
-- is simple minded. If you need a more precise and target specific
-- signal handling, create a new s-intman.adb that will fit your needs.
-- This file assumes that:
-- SIGINT exists and will be kept unmasked unless the pragma
-- Unreserve_All_Interrupts is specified anywhere in the application.
-- System.OS_Interface contains the following:
-- SIGADAABORT: the signal that will be used to abort tasks.
-- Unmasked: the OS specific set of signals that should be unmasked in
-- all the threads. SIGADAABORT is unmasked by
-- default
-- Reserved: the OS specific set of signals that are reserved.
package body System.Interrupt_Management is
use Interfaces.C;
use System.OS_Interface;
Unreserve_All_Interrupts : constant Interfaces.C.int;
pragma Import
(C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts");
-----------------------
-- Local Subprograms --
-----------------------
function State (Int : Interrupt_ID) return Character;
pragma Import (C, State, "__gnat_get_interrupt_state");
-- Get interrupt state. Defined in init.c The input argument is the
-- interrupt number, and the result is one of the following:
User : constant Character := 'u';
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)
----------------
-- Initialize --
----------------
Initialized : Boolean := False;
procedure Initialize is
begin
if Initialized then
return;
end if;
Initialized := True;
-- Need to call pthread_init very early because it is doing signal
-- initializations.
pthread_init;
Abort_Task_Interrupt := SIGADAABORT;
pragma Assert (Keep_Unmasked = (Interrupt_ID'Range => False));
pragma Assert (Reserve = (Interrupt_ID'Range => False));
-- Process state of exception signals
for J in Exception_Signals'Range loop
declare
Sig : constant Signal := Exception_Signals (J);
Id : constant Interrupt_ID := Interrupt_ID (Sig);
begin
if State (Id) /= User then
Keep_Unmasked (Id) := True;
Reserve (Id) := True;
end if;
end;
end loop;
if State (Abort_Task_Interrupt) /= User then
Keep_Unmasked (Abort_Task_Interrupt) := True;
Reserve (Abort_Task_Interrupt) := True;
end if;
-- Set SIGINT to unmasked state as long as it is not in "User" state.
-- Check for Unreserve_All_Interrupts last.
if State (SIGINT) /= User then
Keep_Unmasked (SIGINT) := True;
Reserve (SIGINT) := True;
end if;
-- Check all signals for state that requires keeping them unmasked and
-- reserved.
for J in Interrupt_ID'Range loop
if State (J) = Default or else State (J) = Runtime then
Keep_Unmasked (J) := True;
Reserve (J) := True;
end if;
end loop;
-- Add the set of signals that must always be unmasked for this target
for J in Unmasked'Range loop
Keep_Unmasked (Interrupt_ID (Unmasked (J))) := True;
Reserve (Interrupt_ID (Unmasked (J))) := True;
end loop;
-- Add target-specific reserved signals
for J in Reserved'Range loop
Reserve (Interrupt_ID (Reserved (J))) := True;
end loop;
-- Process pragma Unreserve_All_Interrupts. This overrides any settings
-- due to pragma Interrupt_State:
if Unreserve_All_Interrupts /= 0 then
Keep_Unmasked (SIGINT) := False;
Reserve (SIGINT) := False;
end if;
-- We do not really have Signal 0. We just use this value to identify
-- non-existent signals (see s-intnam.ads). Therefore, Signal should not
-- be used in all signal related operations hence mark it as reserved.
Reserve (0) := True;
end Initialize;
end System.Interrupt_Management;
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