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) 1991-1994, Florida State University --
10 --- Copyright (C) 1995-2005, AdaCore --
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. --
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. --
30 -- GNARL was developed by the GNARL team at Florida State University. --
31 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
33 ------------------------------------------------------------------------------
35 -- This is a SGI Pthread version of this package.
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.
46 with System
.OS_Interface
;
47 -- used for various Constants, Signal and types
49 package body System
.Interrupt_Management
is
51 use System
.OS_Interface
;
53 type Interrupt_List
is array (Interrupt_ID
range <>) of Interrupt_ID
;
54 Exception_Interrupts
: constant Interrupt_List
:=
55 (SIGTSTP
, SIGILL
, SIGTRAP
, SIGEMT
, SIGFPE
, SIGBUS
, SIGSTOP
, SIGKILL
,
56 SIGSEGV
, SIGSYS
, SIGXCPU
, SIGXFSZ
, SIGPROF
, SIGPTINTR
, SIGPTRESCHED
,
59 Unreserve_All_Interrupts
: Interfaces
.C
.int
;
61 (C
, Unreserve_All_Interrupts
, "__gl_unreserve_all_interrupts");
63 function State
(Int
: Interrupt_ID
) return Character;
64 pragma Import
(C
, State
, "__gnat_get_interrupt_state");
66 -- Get interrupt state. Defined in a-init.c
67 -- The input argument is the interrupt number,
68 -- and the result is one of the following:
70 User
: constant Character := 'u';
71 Runtime
: constant Character := 'r';
72 Default
: constant Character := 's';
73 -- 'n' this interrupt not set by any Interrupt_State pragma
74 -- 'u' Interrupt_State pragma set state to User
75 -- 'r' Interrupt_State pragma set state to Runtime
76 -- 's' Interrupt_State pragma set state to System (use "default"
83 Initialized
: Boolean := False;
85 procedure Initialize
is
86 use type Interfaces
.C
.int
;
93 Abort_Task_Interrupt
:= SIGABRT
;
95 -- Change this if you want to use another signal for task abort.
96 -- SIGTERM might be a good one.
98 pragma Assert
(Keep_Unmasked
= (Interrupt_ID
'Range => False));
99 pragma Assert
(Reserve
= (Interrupt_ID
'Range => False));
101 -- Process state of exception signals
103 for J
in Exception_Interrupts
'Range loop
104 if State
(Exception_Interrupts
(J
)) /= User
then
105 Keep_Unmasked
(Exception_Interrupts
(J
)) := True;
106 Reserve
(Exception_Interrupts
(J
)) := True;
110 if State
(Abort_Task_Interrupt
) /= User
then
111 Keep_Unmasked
(Abort_Task_Interrupt
) := True;
112 Reserve
(Abort_Task_Interrupt
) := True;
115 -- Set SIGINT to unmasked state as long as it's
116 -- not in "User" state. Check for Unreserve_All_Interrupts last
118 if State
(SIGINT
) /= User
then
119 Keep_Unmasked
(SIGINT
) := True;
122 -- Check all signals for state that requires keeping them
123 -- unmasked and reserved
125 for J
in Interrupt_ID
'Range loop
126 if State
(J
) = Default
or else State
(J
) = Runtime
then
127 Keep_Unmasked
(J
) := True;
132 -- Process pragma Unreserve_All_Interrupts. This overrides any
133 -- settings due to pragma Interrupt_State:
135 if Unreserve_All_Interrupts
/= 0 then
136 Keep_Unmasked
(SIGINT
) := False;
137 Reserve
(SIGINT
) := False;
140 -- We do not have Signal 0 in reality. We just use this value
141 -- to identify not existing signals (see s-intnam.ads). Therefore,
142 -- Signal 0 should not be used in all signal related operations hence
143 -- mark it as reserved.
148 end System
.Interrupt_Management
;