gcc/ada/libgnarl/s-intman__vxworks.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --           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          --
   6 --                                                                          --
   7 --                                  B o d y                                 --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2018, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNARL was developed by the GNARL team at Florida State University.       --
  28 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This is the VxWorks version of this package
  33
  34 --  It is simpler than other versions because the Ada interrupt handling
  35 --  mechanisms are used for hardware interrupts rather than signals.
  36
  37 package body System.Interrupt_Management is
  38
  39    use System.OS_Interface;
  40
  41    -----------------------
  42    -- Local Subprograms --
  43    -----------------------
  44
  45    function State (Int : Interrupt_ID) return Character;
  46    pragma Import (C, State, "__gnat_get_interrupt_state");
  47    --  Get interrupt state. Defined in init.c The input argument is the
  48    --  hardware interrupt number, and the result is one of the following:
  49
  50    Runtime : constant Character := 'r';
  51    Default : constant Character := 's';
  52    --    'n'   this interrupt not set by any Interrupt_State pragma
  53    --    'u'   Interrupt_State pragma set state to User
  54    --    'r'   Interrupt_State pragma set state to Runtime
  55    --    's'   Interrupt_State pragma set state to System (use "default"
  56    --           system handler)
  57
  58    ----------------
  59    -- Initialize --
  60    ----------------
  61
  62    Initialized : Boolean := False;
  63    --  Set to True once Initialize is called, further calls have no effect
  64
  65    procedure Initialize is
  66
  67    begin
  68       if Initialized then
  69          return;
  70       end if;
  71
  72       Initialized := True;
  73
  74       --  Change this if you want to use another signal for task abort.
  75       --  SIGTERM might be a good one.
  76
  77       Abort_Task_Interrupt := SIGABRT;
  78
  79       --  Initialize hardware interrupt handling
  80
  81       pragma Assert (Reserve = (Interrupt_ID'Range => False));
  82
  83       --  Check all interrupts for state that requires keeping them reserved
  84
  85       for J in Interrupt_ID'Range loop
  86          if State (J) = Default or else State (J) = Runtime then
  87             Reserve (J) := True;
  88          end if;
  89       end loop;
  90
  91    end Initialize;
  92
  93 end System.Interrupt_Management;