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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
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--                                                                          --
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--           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          --
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--                                                                          --
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--                                  B o d y                                 --
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--                                                                          --
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--                      Copyright (C) 1995-2010, AdaCore                    --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNARL was developed by the GNARL team at Florida State University.       --
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-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This is a SGI Pthread version of this package
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--  Make a careful study of all signals available under the OS, to see which
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--  need to be reserved, kept always unmasked, or kept always unmasked. Be on
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--  the lookout for special signals that may be used by the thread library.
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package body System.Interrupt_Management is
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   use System.OS_Interface;
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   type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
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   Exception_Interrupts : constant Interrupt_List :=
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     (SIGTSTP, SIGILL, SIGTRAP, SIGEMT, SIGFPE, SIGBUS, SIGSTOP, SIGKILL,
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      SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ, SIGPROF, SIGPTINTR, SIGPTRESCHED,
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      SIGABRT, SIGPIPE);
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   Unreserve_All_Interrupts : Interfaces.C.int;
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   pragma Import
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     (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts");
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   function State (Int : Interrupt_ID) return Character;
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   pragma Import (C, State, "__gnat_get_interrupt_state");
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   --  Get interrupt state.  Defined in a-init.c
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   --  The input argument is the interrupt number,
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   --  and the result is one of the following:
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   User    : constant Character := 'u';
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   Runtime : constant Character := 'r';
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   Default : constant Character := 's';
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   --    'n'   this interrupt not set by any Interrupt_State pragma
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   --    'u'   Interrupt_State pragma set state to User
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   --    'r'   Interrupt_State pragma set state to Runtime
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   --    's'   Interrupt_State pragma set state to System (use "default"
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   --           system handler)
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   ----------------
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   -- Initialize --
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   ----------------
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   Initialized : Boolean := False;
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   procedure Initialize is
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      use type Interfaces.C.int;
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   begin
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      if Initialized then
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         return;
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      end if;
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      Initialized := True;
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      Abort_Task_Interrupt := SIGABRT;
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      --  Change this if you want to use another signal for task abort.
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      --  SIGTERM might be a good one.
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      pragma Assert (Keep_Unmasked = (Interrupt_ID'Range => False));
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      pragma Assert (Reserve = (Interrupt_ID'Range => False));
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      --  Process state of exception signals
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      for J in Exception_Interrupts'Range loop
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         if State (Exception_Interrupts (J)) /= User then
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            Keep_Unmasked (Exception_Interrupts (J)) := True;
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            Reserve (Exception_Interrupts (J)) := True;
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         end if;
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      end loop;
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      if State (Abort_Task_Interrupt) /= User then
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         Keep_Unmasked (Abort_Task_Interrupt) := True;
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         Reserve (Abort_Task_Interrupt) := True;
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      end if;
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      --  Set SIGINT to unmasked state as long as it's
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      --  not in "User" state.  Check for Unreserve_All_Interrupts last
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      if State (SIGINT) /= User then
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         Keep_Unmasked (SIGINT) := True;
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      end if;
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      --  Check all signals for state that requires keeping them
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      --  unmasked and reserved
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      for J in Interrupt_ID'Range loop
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         if State (J) = Default or else State (J) = Runtime then
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            Keep_Unmasked (J) := True;
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            Reserve (J) := True;
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         end if;
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      end loop;
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      --  Process pragma Unreserve_All_Interrupts. This overrides any
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      --  settings due to pragma Interrupt_State:
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      if Unreserve_All_Interrupts /= 0 then
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         Keep_Unmasked (SIGINT) := False;
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         Reserve (SIGINT) := False;
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      end if;
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      --  We do not have Signal 0 in reality. We just use this value
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      --  to identify not existing signals (see s-intnam.ads). Therefore,
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      --  Signal 0 should not be used in all signal related operations hence
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      --  mark it as reserved.
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      Reserve (0) := True;
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   end Initialize;
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end System.Interrupt_Management;

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