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) 1995-2006, 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 with System
.Task_Primitives
.Operations
;
36 -- used for Write_Lock
40 with System
.Tasking
.Initialization
;
41 -- used for Defer_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
59 procedure Finalize
(X
: in out Instance
) is
60 Q
, To_Be_Freed
: Access_Node
;
61 Self_Id
: constant Task_Id
:= Self
;
64 Defer_Abort
(Self_Id
);
67 -- Remove this instantiation from the list of all instantiations.
71 Q
: Access_Instance
:= All_Attributes
;
74 while Q
/= null and then Q
/= X
'Unchecked_Access loop
78 pragma Assert
(Q
/= null);
81 All_Attributes
:= Q
.Next
;
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.
96 -- Remove nodes for this attribute from the lists of all tasks,
97 -- and deallocate the nodes. Deallocation does finalization, if
101 C
: System
.Tasking
.Task_Id
:= All_Tasks_List
;
108 Q
:= To_Access_Node
(C
.Indirect_Attributes
);
110 and then Q
.Instance
/= X
'Unchecked_Access
118 C
.Indirect_Attributes
:= To_Access_Address
(Q
.Next
);
123 -- Can't Deallocate now since we are holding RTS_Lock
125 Q
.Next
:= To_Be_Freed
;
130 C
:= C
.Common
.All_Tasks_Link
;
137 while To_Be_Freed
/= null loop
139 To_Be_Freed
:= To_Be_Freed
.Next
;
140 X
.Deallocate
.all (Q
);
143 Undefer_Abort
(Self_Id
);
148 pragma Assert
(False,
149 "Exception in task attribute instance finalization");
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
161 Q
: Access_Node
:= To_Access_Node
(T
.Indirect_Attributes
);
164 -- Deallocate all the indirect attributes of this task
168 Q
:= Q
.Next
; P
.Instance
.Deallocate
.all (P
);
171 T
.Indirect_Attributes
:= 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
188 Self_Id
: constant Task_Id
:= Self
;
191 Defer_Abort
(Self_Id
);
194 -- Initialize all the direct-access attributes of this task
200 T
.Direct_Attributes
(P
.Index
) :=
201 Direct_Attribute_Element
202 (System
.Storage_Elements
.To_Address
(P
.Initial_Value
));
209 Undefer_Abort
(Self_Id
);
214 pragma Assert
(False);
215 end Initialize_Attributes
;
217 end System
.Tasking
.Task_Attributes
;