gcc/ada/s-intman-irix.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) 1991-1994, Florida State University            --
  10 ---                     Copyright (C) 1995-2006, AdaCore                     --
  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,  51  Franklin  Street,  Fifth  Floor, --
  21 -- Boston, MA 02110-1301, 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.       --
  31 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  This is a SGI Pthread version of this package.
  36
  37 --  Make a careful study of all signals available under the OS,
  38 --  to see which need to be reserved, kept always unmasked,
  39 --  or kept always unmasked.
  40 --  Be on the lookout for special signals that
  41 --  may be used by the thread library.
  42
  43 package body System.Interrupt_Management is
  44
  45    use System.OS_Interface;
  46
  47    type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
  48    Exception_Interrupts : constant Interrupt_List :=
  49      (SIGTSTP, SIGILL, SIGTRAP, SIGEMT, SIGFPE, SIGBUS, SIGSTOP, SIGKILL,
  50       SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ, SIGPROF, SIGPTINTR, SIGPTRESCHED,
  51       SIGABRT, SIGPIPE);
  52
  53    Unreserve_All_Interrupts : Interfaces.C.int;
  54    pragma Import
  55      (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts");
  56
  57    function State (Int : Interrupt_ID) return Character;
  58    pragma Import (C, State, "__gnat_get_interrupt_state");
  59
  60    --  Get interrupt state.  Defined in a-init.c
  61    --  The input argument is the interrupt number,
  62    --  and the result is one of the following:
  63
  64    User    : constant Character := 'u';
  65    Runtime : constant Character := 'r';
  66    Default : constant Character := 's';
  67    --    'n'   this interrupt not set by any Interrupt_State pragma
  68    --    'u'   Interrupt_State pragma set state to User
  69    --    'r'   Interrupt_State pragma set state to Runtime
  70    --    's'   Interrupt_State pragma set state to System (use "default"
  71    --           system handler)
  72
  73    ----------------
  74    -- Initialize --
  75    ----------------
  76
  77    Initialized : Boolean := False;
  78
  79    procedure Initialize is
  80       use type Interfaces.C.int;
  81    begin
  82       if Initialized then
  83          return;
  84       end if;
  85
  86       Initialized := True;
  87       Abort_Task_Interrupt := SIGABRT;
  88
  89       --  Change this if you want to use another signal for task abort.
  90       --  SIGTERM might be a good one.
  91
  92       pragma Assert (Keep_Unmasked = (Interrupt_ID'Range => False));
  93       pragma Assert (Reserve = (Interrupt_ID'Range => False));
  94
  95       --  Process state of exception signals
  96
  97       for J in Exception_Interrupts'Range loop
  98          if State (Exception_Interrupts (J)) /= User then
  99             Keep_Unmasked (Exception_Interrupts (J)) := True;
 100             Reserve (Exception_Interrupts (J)) := True;
 101          end if;
 102       end loop;
 103
 104       if State (Abort_Task_Interrupt) /= User then
 105          Keep_Unmasked (Abort_Task_Interrupt) := True;
 106          Reserve (Abort_Task_Interrupt) := True;
 107       end if;
 108
 109       --  Set SIGINT to unmasked state as long as it's
 110       --  not in "User" state.  Check for Unreserve_All_Interrupts last
 111
 112       if State (SIGINT) /= User then
 113          Keep_Unmasked (SIGINT) := True;
 114       end if;
 115
 116       --  Check all signals for state that requires keeping them
 117       --  unmasked and reserved
 118
 119       for J in Interrupt_ID'Range loop
 120          if State (J) = Default or else State (J) = Runtime then
 121             Keep_Unmasked (J) := True;
 122             Reserve (J) := True;
 123          end if;
 124       end loop;
 125
 126       --  Process pragma Unreserve_All_Interrupts. This overrides any
 127       --  settings due to pragma Interrupt_State:
 128
 129       if Unreserve_All_Interrupts /= 0 then
 130          Keep_Unmasked (SIGINT) := False;
 131          Reserve (SIGINT) := False;
 132       end if;
 133
 134       --  We do not have Signal 0 in reality. We just use this value
 135       --  to identify not existing signals (see s-intnam.ads). Therefore,
 136       --  Signal 0 should not be used in all signal related operations hence
 137       --  mark it as reserved.
 138
 139       Reserve (0) := True;
 140    end Initialize;
 141
 142 end System.Interrupt_Management;