File : s-tataat.adb
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) 2014-2015, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT 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 -- --
19 -- --
20 -- --
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 with System.Parameters; use System.Parameters;
33 with System.Tasking.Initialization; use System.Tasking.Initialization;
34 with System.Task_Primitives.Operations;
35
36 package body System.Tasking.Task_Attributes is
37
38 package STPO renames System.Task_Primitives.Operations;
39
40 type Index_Info is record
41 Used : Boolean;
42 -- Used is True if a given index is used by an instantiation of
43 -- Ada.Task_Attributes, False otherwise.
44
45 Require_Finalization : Boolean;
46 -- Require_Finalization is True if the attribute requires finalization
47 end record;
48
49 Index_Array : array (1 .. Max_Attribute_Count) of Index_Info :=
50 (others => (False, False));
51
52 -- Note that this package will use an efficient implementation with no
53 -- locks and no extra dynamic memory allocation if Attribute can fit in a
54 -- System.Address type and Initial_Value is 0 (or null for an access type).
55
56 function Next_Index (Require_Finalization : Boolean) return Integer is
57 Self_Id : constant Task_Id := STPO.Self;
58
59 begin
60 Task_Lock (Self_Id);
61
62 for J in Index_Array'Range loop
63 if not Index_Array (J).Used then
64 Index_Array (J).Used := True;
65 Index_Array (J).Require_Finalization := Require_Finalization;
66 Task_Unlock (Self_Id);
67 return J;
68 end if;
69 end loop;
70
71 Task_Unlock (Self_Id);
72 raise Storage_Error with "Out of task attributes";
73 end Next_Index;
74
75 --------------
76 -- Finalize --
77 --------------
78
79 procedure Finalize (Index : Integer) is
80 Self_Id : constant Task_Id := STPO.Self;
81 begin
82 pragma Assert (Index in Index_Array'Range);
83 Task_Lock (Self_Id);
84 Index_Array (Index).Used := False;
85 Task_Unlock (Self_Id);
86 end Finalize;
87
88 --------------------------
89 -- Require_Finalization --
90 --------------------------
91
92 function Require_Finalization (Index : Integer) return Boolean is
93 begin
94 pragma Assert (Index in Index_Array'Range);
95 return Index_Array (Index).Require_Finalization;
96 end Require_Finalization;
97
98 end System.Tasking.Task_Attributes;