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