Mercurial > hg > CbC > CbC_gcc

comparison gcc/ada/libgnarl/s-intman__solaris.adb @ 111:04ced10e8804

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents
children 84e7813d76e9
comparison
equal deleted inserted replaced
68:561a7518be6b 111:04ced10e8804
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT 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 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
10 -- --
11 -- GNARL 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. --
17 -- --
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. --
21 -- --
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/>. --
26 -- --
27 -- GNARL was developed by the GNARL team at Florida State University. --
28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
29 -- --
30 ------------------------------------------------------------------------------
31
32 -- This is a Solaris version of this package
33
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.
36
37 -- Be on the lookout for special signals that may be used by the thread
38 -- library.
39
40 package body System.Interrupt_Management is
41
42 use Interfaces.C;
43 use System.OS_Interface;
44
45 type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID;
46
47 Exception_Interrupts : constant Interrupt_List :=
48 (SIGFPE, SIGILL, SIGSEGV, SIGBUS);
49
50 Unreserve_All_Interrupts : Interfaces.C.int;
51 pragma Import
52 (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts");
53
54 function State (Int : Interrupt_ID) return Character;
55 pragma Import (C, State, "__gnat_get_interrupt_state");
56 -- Get interrupt state. Defined in init.c
57 -- The input argument is the interrupt number,
58 -- and the result is one of the following:
59
60 User : constant Character := 'u';
61 Runtime : constant Character := 'r';
62 Default : constant Character := 's';
63 -- 'n' this interrupt not set by any Interrupt_State pragma
64 -- 'u' Interrupt_State pragma set state to User
65 -- 'r' Interrupt_State pragma set state to Runtime
66 -- 's' Interrupt_State pragma set state to System (use "default"
67 -- system handler)
68
69 ----------------------
70 -- Notify_Exception --
71 ----------------------
72
73 -- This function identifies the Ada exception to be raised using the
74 -- information when the system received a synchronous signal. Since this
75 -- function is machine and OS dependent, different code has to be provided
76 -- for different target.
77
78 procedure Notify_Exception
79 (signo : Signal;
80 info : access siginfo_t;
81 context : access ucontext_t);
82
83 ----------------------
84 -- Notify_Exception --
85 ----------------------
86
87 procedure Notify_Exception
88 (signo : Signal;
89 info : access siginfo_t;
90 context : access ucontext_t)
91 is
92 pragma Unreferenced (info);
93
94 begin
95 -- Perform the necessary context adjustments prior to a raise from a
96 -- signal handler.
97
98 Adjust_Context_For_Raise (signo, context.all'Address);
99
100 -- Check that treatment of exception propagation here is consistent with
101 -- treatment of the abort signal in System.Task_Primitives.Operations.
102
103 case signo is
104 when SIGFPE => raise Constraint_Error;
105 when SIGILL => raise Program_Error;
106 when SIGSEGV => raise Storage_Error;
107 when SIGBUS => raise Storage_Error;
108 when others => null;
109 end case;
110 end Notify_Exception;
111
112 ----------------
113 -- Initialize --
114 ----------------
115
116 Initialized : Boolean := False;
117
118 procedure Initialize is
119 act : aliased struct_sigaction;
120 old_act : aliased struct_sigaction;
121 mask : aliased sigset_t;
122 Result : Interfaces.C.int;
123
124 begin
125 if Initialized then
126 return;
127 end if;
128
129 Initialized := True;
130
131 -- Need to call pthread_init very early because it is doing signal
132 -- initializations.
133
134 pthread_init;
135
136 -- Change this if you want to use another signal for task abort.
137 -- SIGTERM might be a good one.
138
139 Abort_Task_Interrupt := SIGABRT;
140
141 act.sa_handler := Notify_Exception'Address;
142
143 -- Set sa_flags to SA_NODEFER so that during the handler execution
144 -- we do not change the Signal_Mask to be masked for the Signal.
145 -- This is a temporary fix to the problem that the Signal_Mask is
146 -- not restored after the exception (longjmp) from the handler.
147 -- The right fix should be made in sigsetjmp so that we save
148 -- the Signal_Set and restore it after a longjmp.
149
150 -- In that case, this field should be changed back to 0. ??? (Dong-Ik)
151
152 act.sa_flags := 16;
153
154 Result := sigemptyset (mask'Access);
155 pragma Assert (Result = 0);
156
157 -- ??? For the same reason explained above, we can't mask these signals
158 -- because otherwise we won't be able to catch more than one signal.
159
160 act.sa_mask := mask;
161
162 pragma Assert (Keep_Unmasked = (Interrupt_ID'Range => False));
163 pragma Assert (Reserve = (Interrupt_ID'Range => False));
164
165 for J in Exception_Interrupts'Range loop
166 if State (Exception_Interrupts (J)) /= User then
167 Keep_Unmasked (Exception_Interrupts (J)) := True;
168 Reserve (Exception_Interrupts (J)) := True;
169
170 if State (Exception_Interrupts (J)) /= Default then
171 Result :=
172 sigaction
173 (Signal (Exception_Interrupts (J)), act'Unchecked_Access,
174 old_act'Unchecked_Access);
175 pragma Assert (Result = 0);
176 end if;
177 end if;
178 end loop;
179
180 if State (Abort_Task_Interrupt) /= User then
181 Keep_Unmasked (Abort_Task_Interrupt) := True;
182 Reserve (Abort_Task_Interrupt) := True;
183 end if;
184
185 -- Set SIGINT to unmasked state as long as it's
186 -- not in "User" state. Check for Unreserve_All_Interrupts last
187
188 if State (SIGINT) /= User then
189 Keep_Unmasked (SIGINT) := True;
190 Reserve (SIGINT) := True;
191 end if;
192
193 -- Check all signals for state that requires keeping them
194 -- unmasked and reserved
195
196 for J in Interrupt_ID'Range loop
197 if State (J) = Default or else State (J) = Runtime then
198 Keep_Unmasked (J) := True;
199 Reserve (J) := True;
200 end if;
201 end loop;
202
203 -- Add the set of signals that must always be unmasked for this target
204
205 for J in Unmasked'Range loop
206 Keep_Unmasked (Interrupt_ID (Unmasked (J))) := True;
207 Reserve (Interrupt_ID (Unmasked (J))) := True;
208 end loop;
209
210 -- Add target-specific reserved signals
211
212 for J in Reserved'Range loop
213 Reserve (Interrupt_ID (Reserved (J))) := True;
214 end loop;
215
216 -- Process pragma Unreserve_All_Interrupts. This overrides any
217 -- settings due to pragma Interrupt_State:
218
219 if Unreserve_All_Interrupts /= 0 then
220 Keep_Unmasked (SIGINT) := False;
221 Reserve (SIGINT) := False;
222 end if;
223
224 -- We do not have Signal 0 in reality. We just use this value to
225 -- identify not existing signals (see s-intnam.ads). Therefore, Signal 0
226 -- should not be used in all signal related operations hence mark it as
227 -- reserved.
228
229 Reserve (0) := True;
230 end Initialize;
231
232 end System.Interrupt_Management;