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 --                             $Revision: 1.6 $                             --
  10 --                                                                          --
  11 --            Copyright (C) 1997-1998, 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 an Irix (old pthread library) 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 System.OS_Interface;
  49 --  used for various Constants, Signal and types
  50
  51 package body System.Interrupt_Management is
  52
  53    use System.OS_Interface;
  54
  55    type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
  56
  57    Exception_Interrupts : constant Interrupt_List :=
  58      (SIGILL,
  59       SIGABRT,
  60       SIGFPE,
  61       SIGSEGV,
  62       SIGBUS);
  63
  64    Reserved_Interrupts : constant Interrupt_List :=
  65      (0,
  66       SIGTRAP,
  67       SIGKILL,
  68       SIGSYS,
  69       SIGALRM,
  70       SIGSTOP,
  71       SIGPTINTR,
  72       SIGPTRESCHED);
  73
  74    Abort_Signal : constant := 48;
  75    --
  76    --  Serious MOJO:  The SGI pthreads library only supports the
  77    --                 unnamed signal number 48 for pthread_kill!
  78    --
  79
  80    ----------------------
  81    -- Notify_Exception --
  82    ----------------------
  83
  84    --  This function identifies the Ada exception to be raised using the
  85    --  information when the system received a synchronous signal.
  86    --  Since this function is machine and OS dependent, different code has to
  87    --  be provided for different target.
  88    --  On SGI, the signal handling is done is a-init.c, even when tasking is
  89    --  involved.
  90
  91    ---------------------------
  92    -- Initialize_Interrupts --
  93    ---------------------------
  94
  95    --  Nothing needs to be done on this platform.
  96
  97    procedure Initialize_Interrupts is
  98    begin
  99       null;
 100    end Initialize_Interrupts;
 101
 102 begin
 103    Abort_Task_Interrupt := Abort_Signal;
 104
 105    for I in Reserved_Interrupts'Range loop
 106       Keep_Unmasked (Reserved_Interrupts (I)) := True;
 107       Reserve (Reserved_Interrupts (I)) := True;
 108    end loop;
 109
 110    for I in Exception_Interrupts'Range loop
 111       Keep_Unmasked (Exception_Interrupts (I)) := True;
 112       Reserve (Reserved_Interrupts (I)) := True;
 113    end loop;
 114
 115 end System.Interrupt_Management;