1 ------------------------------------------------------------------------------
3 -- GNU ADA 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) 1995-2003, Ada Core Technologies --
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. --
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 an Irix (old pthread library) version of this package.
37 -- PLEASE DO NOT add any dependences on other packages.
38 -- This package is designed to work with or without tasking support.
40 -- Make a careful study of all signals available under the OS,
41 -- to see which need to be reserved, kept always unmasked,
42 -- or kept always unmasked.
44 -- Be on the lookout for special signals that
45 -- may be used by the thread library.
47 with System
.OS_Interface
;
48 -- used for various Constants, Signal and types
52 package body System
.Interrupt_Management
is
54 use System
.OS_Interface
;
56 type Interrupt_List
is array (Interrupt_ID
range <>) of Interrupt_ID
;
58 Exception_Interrupts
: constant Interrupt_List
:=
65 Reserved_Interrupts
: constant Interrupt_List
:=
75 Abort_Signal
: constant := 48;
77 -- Serious MOJO: The SGI pthreads library only supports the
78 -- unnamed signal number 48 for pthread_kill!
81 Unreserve_All_Interrupts
: Interfaces
.C
.int
;
83 (C
, Unreserve_All_Interrupts
, "__gl_unreserve_all_interrupts");
85 ----------------------
86 -- Notify_Exception --
87 ----------------------
89 -- This function identifies the Ada exception to be raised using the
90 -- information when the system received a synchronous signal.
91 -- Since this function is machine and OS dependent, different code has to
92 -- be provided for different target.
93 -- On SGI, the signal handling is done is a-init.c, even when tasking is
96 ---------------------------
97 -- Initialize_Interrupts --
98 ---------------------------
100 -- Nothing needs to be done on this platform.
102 procedure Initialize_Interrupts
is
105 end Initialize_Interrupts
;
109 function State
(Int
: Interrupt_ID
) return Character;
110 pragma Import
(C
, State
, "__gnat_get_interrupt_state");
111 -- Get interrupt state. Defined in a-init.c
112 -- The input argument is the interrupt number,
113 -- and the result is one of the following:
115 User
: constant Character := 'u';
116 Runtime
: constant Character := 'r';
117 Default
: constant Character := 's';
118 -- 'n' this interrupt not set by any Interrupt_State pragma
119 -- 'u' Interrupt_State pragma set state to User
120 -- 'r' Interrupt_State pragma set state to Runtime
121 -- 's' Interrupt_State pragma set state to System (use "default"
127 Abort_Task_Interrupt
:= Abort_Signal
;
129 pragma Assert
(Keep_Unmasked
= (Interrupt_ID
'Range => False));
130 pragma Assert
(Reserve
= (Interrupt_ID
'Range => False));
132 -- Process state of exception signals
134 for J
in Exception_Interrupts
'Range loop
135 if State
(Exception_Interrupts
(J
)) /= User
then
136 Keep_Unmasked
(Exception_Interrupts
(J
)) := True;
137 Reserve
(Exception_Interrupts
(J
)) := True;
141 if State
(Abort_Task_Interrupt
) /= User
then
142 Keep_Unmasked
(Abort_Task_Interrupt
) := True;
143 Reserve
(Abort_Task_Interrupt
) := True;
146 -- Set SIGINT to unmasked state as long as it's
147 -- not in "User" state. Check for Unreserve_All_Interrupts last
149 if State
(SIGINT
) /= User
then
150 Keep_Unmasked
(SIGINT
) := True;
153 -- Check all signals for state that requires keeping them
154 -- unmasked and reserved
156 for J
in Interrupt_ID
'Range loop
157 if State
(J
) = Default
or else State
(J
) = Runtime
then
158 Keep_Unmasked
(J
) := True;
163 -- Add target-specific reserved signals
165 for J
in Reserved_Interrupts
'Range loop
166 Reserve
(Interrupt_ID
(Reserved_Interrupts
(J
))) := True;
169 -- Process pragma Unreserve_All_Interrupts. This overrides any
170 -- settings due to pragma Interrupt_State:
172 if Unreserve_All_Interrupts
/= 0 then
173 Keep_Unmasked
(SIGINT
) := False;
174 Reserve
(SIGINT
) := False;
177 -- We do not have Signal 0 in reality. We just use this value
178 -- to identify not existing signals (see s-intnam.ads). Therefore,
179 -- Signal 0 should not be used in all signal related operations hence
180 -- mark it as reserved.
184 end System
.Interrupt_Management
;