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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) 1992-2006 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, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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.
+
+-- 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.
+
+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 --
+ -----------------------
+
+ 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:
+
+ 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)
+
+ 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;
+
+ 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);
+
+ 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;
+
+ ----------------
+ -- Initialize --
+ ----------------
+
+ Initialized : Boolean := False;
+
+ procedure Initialize is
+ mask : aliased sigset_t;
+ Result : int;
+ begin
+ if Initialized then
+ return;
+ end if;
+
+ 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;
+
+ -- 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 Initialize;
+
+end System.Interrupt_Management;