1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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 --
9 -- Copyright (C) 1991-1994, Florida State University --
10 -- Copyright (C) 1995-2010, AdaCore --
12 -- GNAT 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 3, or (at your option) any later ver- --
15 -- sion. GNAT 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. --
19 -- As a special exception under Section 7 of GPL version 3, you are granted --
20 -- additional permissions described in the GCC Runtime Library Exception, --
21 -- version 3.1, as published by the Free Software Foundation. --
23 -- You should have received a copy of the GNU General Public License and --
24 -- a copy of the GCC Runtime Library Exception along with this program; --
25 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
26 -- <http://www.gnu.org/licenses/>. --
28 -- GNARL was developed by the GNARL team at Florida State University. --
29 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
31 ------------------------------------------------------------------------------
33 with Ada
.Unchecked_Conversion
;
35 with System
.Task_Primitives
.Operations
;
36 with System
.Tasking
.Initialization
;
38 package body System
.Tasking
.Task_Attributes
is
40 use Task_Primitives
.Operations
;
41 use Tasking
.Initialization
;
43 function To_Access_Address
is new Ada
.Unchecked_Conversion
44 (Access_Node
, Access_Address
);
45 -- Store pointer to indirect attribute list
51 procedure Finalize
(X
: in out Instance
) is
52 Q
, To_Be_Freed
: Access_Node
;
53 Self_Id
: constant Task_Id
:= Self
;
56 -- Defer abort. Note that we use the nestable versions of Defer_Abort
57 -- and Undefer_Abort, because abort can already deferred when this is
58 -- called during finalization, which would cause an assert failure
61 Defer_Abort_Nestable
(Self_Id
);
64 -- Remove this instantiation from the list of all instantiations
68 Q
: Access_Instance
:= All_Attributes
;
71 while Q
/= null and then Q
/= X
'Unchecked_Access loop
75 pragma Assert
(Q
/= null);
78 All_Attributes
:= Q
.Next
;
86 -- Free location of this attribute, for reuse
88 In_Use
:= In_Use
and not (2**Natural (X
.Index
));
90 -- There is no need for finalization in this case, since controlled
91 -- types are too big to fit in the TCB.
94 -- Remove nodes for this attribute from the lists of all tasks,
95 -- and deallocate the nodes. Deallocation does finalization, if
99 C
: System
.Tasking
.Task_Id
:= All_Tasks_List
;
106 Q
:= To_Access_Node
(C
.Indirect_Attributes
);
108 and then Q
.Instance
/= X
'Unchecked_Access
116 C
.Indirect_Attributes
:= To_Access_Address
(Q
.Next
);
121 -- Can't Deallocate now since we are holding RTS_Lock
123 Q
.Next
:= To_Be_Freed
;
128 C
:= C
.Common
.All_Tasks_Link
;
135 while To_Be_Freed
/= null loop
137 To_Be_Freed
:= To_Be_Freed
.Next
;
138 X
.Deallocate
.all (Q
);
141 Undefer_Abort_Nestable
(Self_Id
);
146 pragma Assert
(False,
147 "Exception in task attribute instance finalization");
150 -------------------------
151 -- Finalize Attributes --
152 -------------------------
154 -- This is to be called just before the ATCB is deallocated.
155 -- It relies on the caller holding T.L write-lock on entry.
157 procedure Finalize_Attributes
(T
: Task_Id
) is
159 Q
: Access_Node
:= To_Access_Node
(T
.Indirect_Attributes
);
162 -- Deallocate all the indirect attributes of this task
166 Q
:= Q
.Next
; P
.Instance
.Deallocate
.all (P
);
169 T
.Indirect_Attributes
:= null;
174 pragma Assert
(False,
175 "Exception in per-task attributes finalization");
176 end Finalize_Attributes
;
178 ---------------------------
179 -- Initialize Attributes --
180 ---------------------------
182 -- This is to be called by System.Tasking.Stages.Create_Task
184 procedure Initialize_Attributes
(T
: Task_Id
) is
186 Self_Id
: constant Task_Id
:= Self
;
189 Defer_Abort
(Self_Id
);
192 -- Initialize all the direct-access attributes of this task
198 T
.Direct_Attributes
(P
.Index
) :=
199 Direct_Attribute_Element
200 (System
.Storage_Elements
.To_Address
(P
.Initial_Value
));
207 Undefer_Abort
(Self_Id
);
212 pragma Assert
(False);
213 end Initialize_Attributes
;
215 end System
.Tasking
.Task_Attributes
;