File : s-tpoaal.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
4 -- --
5 -- SYSTEM.TASK_PRIMITIVES.OPERATIONS.ATCB_ALLOCATION --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 2011, Free Software Foundation, Inc. --
10 -- --
11 -- GNARL 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 Ada.Unchecked_Deallocation;
33
34 separate (System.Task_Primitives.Operations)
35 package body ATCB_Allocation is
36
37 ---------------
38 -- Free_ATCB --
39 ---------------
40
41 procedure Free_ATCB (T : Task_Id) is
42 Tmp : Task_Id := T;
43 Is_Self : constant Boolean := T = Self;
44
45 procedure Free is new
46 Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
47
48 begin
49 if Is_Self then
50 declare
51 Local_ATCB : aliased Ada_Task_Control_Block (0);
52 -- Create a dummy ATCB and initialize it minimally so that "Free"
53 -- can still call Self and Defer/Undefer_Abort after Tmp is freed
54 -- by the underlying memory management library.
55
56 begin
57 Local_ATCB.Common.LL.Thread := T.Common.LL.Thread;
58 Local_ATCB.Common.Current_Priority := T.Common.Current_Priority;
59
60 Specific.Set (Local_ATCB'Unchecked_Access);
61 Free (Tmp);
62
63 -- Note: it is assumed here that for all platforms, Specific.Set
64 -- deletes the task specific information if passed a null value.
65
66 Specific.Set (null);
67 end;
68
69 else
70 Free (Tmp);
71 end if;
72 end Free_ATCB;
73
74 --------------
75 -- New_ATCB --
76 --------------
77
78 function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
79 begin
80 return new Ada_Task_Control_Block (Entry_Num);
81 end New_ATCB;
82
83 end ATCB_Allocation;