* config/alpha/alpha.c, config/alpha/alpha.md,
[official-gcc.git] / gcc / ada / s-tataat.adb
blobc0dede8cc44b72b66d950897ab8b39e282ffb05c
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
4 -- --
5 -- S Y S T E M . T A S K I N G . T A S K _ A T T R I B U T E S --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1991-1994, Florida State University --
10 -- Copyright (C) 1995-2006, AdaCore --
11 -- --
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. --
22 -- --
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. --
29 -- --
30 -- GNARL was developed by the GNARL team at Florida State University. --
31 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 -- --
33 ------------------------------------------------------------------------------
35 with System.Task_Primitives.Operations;
36 -- used for Write_Lock
37 -- Unlock
38 -- Lock/Unlock_RTS
40 with System.Tasking.Initialization;
41 -- used for Defer_Abort
42 -- Undefer_Abort
44 with Unchecked_Conversion;
46 package body System.Tasking.Task_Attributes is
48 use Task_Primitives.Operations;
49 use Tasking.Initialization;
51 function To_Access_Address is new Unchecked_Conversion
52 (Access_Node, Access_Address);
53 -- Store pointer to indirect attribute list
55 --------------
56 -- Finalize --
57 --------------
59 procedure Finalize (X : in out Instance) is
60 Q, To_Be_Freed : Access_Node;
61 Self_Id : constant Task_Id := Self;
63 begin
64 Defer_Abort (Self_Id);
65 Lock_RTS;
67 -- Remove this instantiation from the list of all instantiations.
69 declare
70 P : Access_Instance;
71 Q : Access_Instance := All_Attributes;
73 begin
74 while Q /= null and then Q /= X'Unchecked_Access loop
75 P := Q; Q := Q.Next;
76 end loop;
78 pragma Assert (Q /= null);
80 if P = null then
81 All_Attributes := Q.Next;
82 else
83 P.Next := Q.Next;
84 end if;
85 end;
87 if X.Index /= 0 then
88 -- Free location of this attribute, for reuse.
90 In_Use := In_Use and not (2**Natural (X.Index));
92 -- There is no need for finalization in this case, since controlled
93 -- types are too big to fit in the TCB.
95 else
96 -- Remove nodes for this attribute from the lists of all tasks,
97 -- and deallocate the nodes. Deallocation does finalization, if
98 -- necessary.
100 declare
101 C : System.Tasking.Task_Id := All_Tasks_List;
102 P : Access_Node;
104 begin
105 while C /= null loop
106 Write_Lock (C);
108 Q := To_Access_Node (C.Indirect_Attributes);
109 while Q /= null
110 and then Q.Instance /= X'Unchecked_Access
111 loop
112 P := Q;
113 Q := Q.Next;
114 end loop;
116 if Q /= null then
117 if P = null then
118 C.Indirect_Attributes := To_Access_Address (Q.Next);
119 else
120 P.Next := Q.Next;
121 end if;
123 -- Can't Deallocate now since we are holding RTS_Lock
125 Q.Next := To_Be_Freed;
126 To_Be_Freed := Q;
127 end if;
129 Unlock (C);
130 C := C.Common.All_Tasks_Link;
131 end loop;
132 end;
133 end if;
135 Unlock_RTS;
137 while To_Be_Freed /= null loop
138 Q := To_Be_Freed;
139 To_Be_Freed := To_Be_Freed.Next;
140 X.Deallocate.all (Q);
141 end loop;
143 Undefer_Abort (Self_Id);
145 exception
146 when others =>
147 null;
148 pragma Assert (False,
149 "Exception in task attribute instance finalization");
150 end Finalize;
152 -------------------------
153 -- Finalize Attributes --
154 -------------------------
156 -- This is to be called just before the ATCB is deallocated.
157 -- It relies on the caller holding T.L write-lock on entry.
159 procedure Finalize_Attributes (T : Task_Id) is
160 P : Access_Node;
161 Q : Access_Node := To_Access_Node (T.Indirect_Attributes);
163 begin
164 -- Deallocate all the indirect attributes of this task
166 while Q /= null loop
167 P := Q;
168 Q := Q.Next; P.Instance.Deallocate.all (P);
169 end loop;
171 T.Indirect_Attributes := null;
173 exception
174 when others =>
175 null;
176 pragma Assert (False,
177 "Exception in per-task attributes finalization");
178 end Finalize_Attributes;
180 ---------------------------
181 -- Initialize Attributes --
182 ---------------------------
184 -- This is to be called by System.Tasking.Stages.Create_Task
186 procedure Initialize_Attributes (T : Task_Id) is
187 P : Access_Instance;
188 Self_Id : constant Task_Id := Self;
190 begin
191 Defer_Abort (Self_Id);
192 Lock_RTS;
194 -- Initialize all the direct-access attributes of this task
196 P := All_Attributes;
198 while P /= null loop
199 if P.Index /= 0 then
200 T.Direct_Attributes (P.Index) :=
201 Direct_Attribute_Element
202 (System.Storage_Elements.To_Address (P.Initial_Value));
203 end if;
205 P := P.Next;
206 end loop;
208 Unlock_RTS;
209 Undefer_Abort (Self_Id);
211 exception
212 when others =>
213 null;
214 pragma Assert (False);
215 end Initialize_Attributes;
217 end System.Tasking.Task_Attributes;