-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2005 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2010, 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- --
+-- 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. 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. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- 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. --
+-- 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 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;
+-- This is the VxWorks version of this package
-with System.OS_Interface;
--- used for various Constants, Signal and types
+-- It is simpler than other versions because the Ada interrupt handling
+-- mechanisms are used for hardware interrupts rather than signals.
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);
-
- Exception_Action : aliased struct_sigaction;
- -- Keep this variable global so that it is initialized only once
-
- 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;
+ 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
+ -- hardware interrupt number, and the result is one of the following:
- Result : int;
- pragma Unreferenced (Result);
+ 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
- Result := pthread_sigmask (SIG_SETMASK, null, Mask'Unchecked_Access);
- Result := sigdelset (Mask'Access, signo);
- Result := pthread_sigmask (SIG_SETMASK, Mask'Unchecked_Access, null);
-
- Map_And_Raise_Exception (signo);
- end Notify_Exception;
+ ----------------
+ -- Initialize --
+ ----------------
- ---------------------------
- -- Initialize_Interrupts --
- ---------------------------
+ Initialized : Boolean := False;
+ -- Set to True once Initialize is called, further calls have no effect
- -- Since there is no signal inheritance between VxWorks tasks, we need
- -- to initialize signal handling in each task.
+ procedure Initialize is
- 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)
+ if Initialized then
+ return;
+ end if;
- begin
- -- Initialize signal handling
+ Initialized := True;
-- 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;
+ Abort_Task_Interrupt := SIGABRT;
-- Initialize hardware interrupt handling
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
+ end Initialize;
- Keep_Unmasked (Abort_Task_Signal) := True;
- end;
end System.Interrupt_Management;
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