File : s-taspri-xi.ads
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
4 -- --
5 -- S Y S T E M . T A S K _ P R I M I T I V E S --
6 -- --
7 -- S p e c --
8 -- --
9 -- Copyright (C) 2001-2014, 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 -- This is the version of this package for Ravenscar bare board targets
33
34 pragma Polling (Off);
35 -- Turn off polling, we do not want ATC polling to take place during tasking
36 -- operations. It causes infinite loops and other problems.
37
38 with System.OS_Interface;
39
40 package System.Task_Primitives is
41 pragma Preelaborate;
42
43 type Task_Body_Access is access procedure;
44 -- Pointer to the task body's entry point (or possibly a wrapper
45 -- declared local to the GNARL).
46
47 type Private_Data is limited private;
48 -- Any information that the GNULLI needs maintained on a per-task
49 -- basis. A component of this type is guaranteed to be included
50 -- in the Ada_Task_Control_Block.
51
52 subtype Task_Address is System.Address;
53 Task_Address_Size : constant := Standard'Address_Size;
54 -- Type used for task addresses and its size
55
56 Alternate_Stack_Size : constant := 0;
57 -- No alternate signal stack is used on this platform
58
59 private
60
61 type Private_Data is limited record
62 Thread_Desc : aliased System.OS_Interface.Thread_Descriptor;
63 -- Thread descriptor associated to the ATCB to which it belongs
64
65 Thread : aliased System.OS_Interface.Thread_Id :=
66 System.OS_Interface.Null_Thread_Id;
67 -- Thread Id associated to the ATCB to which it belongs.
68 -- ??? It is mostly used by GDB, so we may want to remove it at some
69 -- point.
70 pragma Atomic (Thread);
71 -- Thread field may be updated by two different threads of control.
72 -- (See, Enter_Task and Create_Task in s-taprop.adb).
73 -- They put the same value (thr_self value). We do not want to
74 -- use lock on those operations and the only thing we have to
75 -- make sure is that they are updated in atomic fashion.
76
77 Lwp : aliased System.Address := System.Null_Address;
78 -- This element duplicates the Thread element. It is read by gdb when
79 -- the remote protocol is used.
80 end record;
81
82 end System.Task_Primitives;