gcc/ada/5gintman.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) 1997-1998, 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 an Irix (old pthread library) 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 System.OS_Interface;
  48 --  used for various Constants, Signal and types
  49
  50 package body System.Interrupt_Management is
  51
  52    use System.OS_Interface;
  53
  54    type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
  55
  56    Exception_Interrupts : constant Interrupt_List :=
  57      (SIGILL,
  58       SIGABRT,
  59       SIGFPE,
  60       SIGSEGV,
  61       SIGBUS);
  62
  63    Reserved_Interrupts : constant Interrupt_List :=
  64      (0,
  65       SIGTRAP,
  66       SIGKILL,
  67       SIGSYS,
  68       SIGALRM,
  69       SIGSTOP,
  70       SIGPTINTR,
  71       SIGPTRESCHED);
  72
  73    Abort_Signal : constant := 48;
  74    --
  75    --  Serious MOJO:  The SGI pthreads library only supports the
  76    --                 unnamed signal number 48 for pthread_kill!
  77    --
  78
  79    ----------------------
  80    -- Notify_Exception --
  81    ----------------------
  82
  83    --  This function identifies the Ada exception to be raised using the
  84    --  information when the system received a synchronous signal.
  85    --  Since this function is machine and OS dependent, different code has to
  86    --  be provided for different target.
  87    --  On SGI, the signal handling is done is a-init.c, even when tasking is
  88    --  involved.
  89
  90    ---------------------------
  91    -- Initialize_Interrupts --
  92    ---------------------------
  93
  94    --  Nothing needs to be done on this platform.
  95
  96    procedure Initialize_Interrupts is
  97    begin
  98       null;
  99    end Initialize_Interrupts;
 100
 101 begin
 102    Abort_Task_Interrupt := Abort_Signal;
 103
 104    for I in Reserved_Interrupts'Range loop
 105       Keep_Unmasked (Reserved_Interrupts (I)) := True;
 106       Reserve (Reserved_Interrupts (I)) := True;
 107    end loop;
 108
 109    for I in Exception_Interrupts'Range loop
 110       Keep_Unmasked (Exception_Interrupts (I)) := True;
 111       Reserve (Reserved_Interrupts (I)) := True;
 112    end loop;
 113
 114 end System.Interrupt_Management;