1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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 --
9 -- Copyright (C) 1995-2010, AdaCore --
11 -- GNAT 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 3, or (at your option) any later ver- --
14 -- sion. GNAT 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. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNARL was developed by the GNARL team at Florida State University. --
28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
30 ------------------------------------------------------------------------------
32 -- This is a SGI Pthread version of this package
34 -- Make a careful study of all signals available under the OS, to see which
35 -- need to be reserved, kept always unmasked, or kept always unmasked. Be on
36 -- the lookout for special signals that may be used by the thread library.
38 package body System.Interrupt_Management is
40 use System.OS_Interface;
42 type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
43 Exception_Interrupts : constant Interrupt_List :=
44 (SIGTSTP, SIGILL, SIGTRAP, SIGEMT, SIGFPE, SIGBUS, SIGSTOP, SIGKILL,
45 SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ, SIGPROF, SIGPTINTR, SIGPTRESCHED,
48 Unreserve_All_Interrupts : Interfaces.C.int;
50 (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts");
52 function State (Int : Interrupt_ID) return Character;
53 pragma Import (C, State, "__gnat_get_interrupt_state");
55 -- Get interrupt state. Defined in a-init.c
56 -- The input argument is the interrupt number,
57 -- and the result is one of the following:
59 User : constant Character := 'u';
60 Runtime : constant Character := 'r';
61 Default : constant Character := 's';
62 -- 'n' this interrupt not set by any Interrupt_State pragma
63 -- 'u' Interrupt_State pragma set state to User
64 -- 'r' Interrupt_State pragma set state to Runtime
65 -- 's' Interrupt_State pragma set state to System (use "default"
72 Initialized : Boolean := False;
74 procedure Initialize is
75 use type Interfaces.C.int;
82 Abort_Task_Interrupt := SIGABRT;
84 -- Change this if you want to use another signal for task abort.
85 -- SIGTERM might be a good one.
87 pragma Assert (Keep_Unmasked = (Interrupt_ID'Range => False));
88 pragma Assert (Reserve = (Interrupt_ID'Range => False));
90 -- Process state of exception signals
92 for J in Exception_Interrupts'Range loop
93 if State (Exception_Interrupts (J)) /= User then
94 Keep_Unmasked (Exception_Interrupts (J)) := True;
95 Reserve (Exception_Interrupts (J)) := True;
99 if State (Abort_Task_Interrupt) /= User then
100 Keep_Unmasked (Abort_Task_Interrupt) := True;
101 Reserve (Abort_Task_Interrupt) := True;
104 -- Set SIGINT to unmasked state as long as it's
105 -- not in "User" state. Check for Unreserve_All_Interrupts last
107 if State (SIGINT) /= User then
108 Keep_Unmasked (SIGINT) := True;
111 -- Check all signals for state that requires keeping them
112 -- unmasked and reserved
114 for J in Interrupt_ID'Range loop
115 if State (J) = Default or else State (J) = Runtime then
116 Keep_Unmasked (J) := True;
121 -- Process pragma Unreserve_All_Interrupts. This overrides any
122 -- settings due to pragma Interrupt_State:
124 if Unreserve_All_Interrupts /= 0 then
125 Keep_Unmasked (SIGINT) := False;
126 Reserve (SIGINT) := False;
129 -- We do not have Signal 0 in reality. We just use this value
130 -- to identify not existing signals (see s-intnam.ads). Therefore,
131 -- Signal 0 should not be used in all signal related operations hence
132 -- mark it as reserved.
137 end System.Interrupt_Management;