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) 1995-2005, 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
.Storage_Elements
;
36 -- used for To_Address
38 with System
.Task_Primitives
.Operations
;
39 -- used for Write_Lock
43 with System
.Tasking
.Initialization
;
44 -- used for Defer_Abort
47 with Unchecked_Conversion
;
49 package body System
.Tasking
.Task_Attributes
is
51 use Task_Primitives
.Operations
;
52 use Tasking
.Initialization
;
54 function To_Access_Address
is new Unchecked_Conversion
55 (Access_Node
, Access_Address
);
56 -- Store pointer to indirect attribute list
62 procedure Finalize
(X
: in out Instance
) is
63 Q
, To_Be_Freed
: Access_Node
;
64 Self_Id
: constant Task_Id
:= Self
;
67 Defer_Abort
(Self_Id
);
70 -- Remove this instantiation from the list of all instantiations.
74 Q
: Access_Instance
:= All_Attributes
;
77 while Q
/= null and then Q
/= X
'Unchecked_Access loop
81 pragma Assert
(Q
/= null);
84 All_Attributes
:= Q
.Next
;
91 -- Free location of this attribute, for reuse.
93 In_Use
:= In_Use
and not (2**Natural (X
.Index
));
95 -- There is no need for finalization in this case, since controlled
96 -- types are too big to fit in the TCB.
99 -- Remove nodes for this attribute from the lists of all tasks,
100 -- and deallocate the nodes. Deallocation does finalization, if
104 C
: System
.Tasking
.Task_Id
:= All_Tasks_List
;
111 Q
:= To_Access_Node
(C
.Indirect_Attributes
);
113 and then Q
.Instance
/= X
'Unchecked_Access
121 C
.Indirect_Attributes
:= To_Access_Address
(Q
.Next
);
126 -- Can't Deallocate now since we are holding RTS_Lock
128 Q
.Next
:= To_Be_Freed
;
133 C
:= C
.Common
.All_Tasks_Link
;
140 while To_Be_Freed
/= null loop
142 To_Be_Freed
:= To_Be_Freed
.Next
;
143 X
.Deallocate
.all (Q
);
146 Undefer_Abort
(Self_Id
);
151 pragma Assert
(False,
152 "Exception in task attribute instance finalization");
155 -------------------------
156 -- Finalize Attributes --
157 -------------------------
159 -- This is to be called just before the ATCB is deallocated.
160 -- It relies on the caller holding T.L write-lock on entry.
162 procedure Finalize_Attributes
(T
: Task_Id
) is
164 Q
: Access_Node
:= To_Access_Node
(T
.Indirect_Attributes
);
167 -- Deallocate all the indirect attributes of this task
171 Q
:= Q
.Next
; P
.Instance
.Deallocate
.all (P
);
174 T
.Indirect_Attributes
:= null;
179 pragma Assert
(False,
180 "Exception in per-task attributes finalization");
181 end Finalize_Attributes
;
183 ---------------------------
184 -- Initialize Attributes --
185 ---------------------------
187 -- This is to be called by System.Tasking.Stages.Create_Task
189 procedure Initialize_Attributes
(T
: Task_Id
) is
191 Self_Id
: constant Task_Id
:= Self
;
194 Defer_Abort
(Self_Id
);
197 -- Initialize all the direct-access attributes of this task
203 T
.Direct_Attributes
(P
.Index
) :=
204 Direct_Attribute_Element
205 (System
.Storage_Elements
.To_Address
(P
.Initial_Value
));
212 Undefer_Abort
(Self_Id
);
217 pragma Assert
(False);
218 end Initialize_Attributes
;
220 end System
.Tasking
.Task_Attributes
;