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