gcc/ada/5fintman.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA 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 --                             $Revision: 1.5 $
  10 --                                                                          --
  11 --            Copyright (C) 1991-2001, Florida State University             --
  12 --                                                                          --
  13 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNARL was developed by the GNARL team at Florida State University. It is --
  32 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  33 -- State University (http://www.gnat.com).                                  --
  34 --                                                                          --
  35 ------------------------------------------------------------------------------
  36
  37 --  This is a SGI Pthread version of this package.
  38
  39 --  PLEASE DO NOT add any dependences on other packages.
  40 --  This package is designed to work with or without tasking support.
  41
  42 --  Make a careful study of all signals available under the OS,
  43 --  to see which need to be reserved, kept always unmasked,
  44 --  or kept always unmasked.
  45 --  Be on the lookout for special signals that
  46 --  may be used by the thread library.
  47
  48 with Interfaces.C;
  49 --  used for int
  50
  51 with System.OS_Interface;
  52 --  used for various Constants, Signal and types
  53
  54 package body System.Interrupt_Management is
  55
  56    use System.OS_Interface;
  57
  58    type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
  59    Exception_Interrupts : constant Interrupt_List :=
  60      (SIGTSTP, SIGILL, SIGTRAP, SIGEMT, SIGFPE, SIGBUS, SIGSTOP, SIGKILL,
  61       SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ, SIGPROF, SIGPTINTR, SIGPTRESCHED,
  62       SIGABRT, SIGPIPE);
  63
  64    ---------------------------
  65    -- Initialize_Interrupts --
  66    ---------------------------
  67
  68    --  Nothing needs to be done on this platform.
  69
  70    procedure Initialize_Interrupts is
  71    begin
  72       null;
  73    end Initialize_Interrupts;
  74
  75    Unreserve_All_Interrupts : Interfaces.C.int;
  76    pragma Import
  77      (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts");
  78
  79    use type Interfaces.C.int;
  80
  81 begin
  82    Abort_Task_Interrupt := SIGABRT;
  83    --  Change this if you want to use another signal for task abort.
  84    --  SIGTERM might be a good one.
  85
  86    for I in Exception_Interrupts'Range loop
  87       Keep_Unmasked (Exception_Interrupts (I)) := True;
  88    end loop;
  89
  90    --  By keeping SIGINT unmasked, allow the user to do a Ctrl-C, but in the
  91    --  same time, disable the ability of handling this signal via
  92    --  Ada.Interrupts.
  93    --  The pragma Unreserve_All_Interrupts let the user the ability to
  94    --  change this behavior.
  95
  96    if Unreserve_All_Interrupts = 0 then
  97       Keep_Unmasked (SIGINT) := True;
  98    end if;
  99
 100    Keep_Unmasked (Abort_Task_Interrupt) := True;
 101
 102    Reserve := Keep_Unmasked or Keep_Masked;
 103    Reserve (0) := True;
 104 end System.Interrupt_Management;