1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC --
9 -- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
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/>. --
27 -- GNARL was developed by the GNARL team at Florida State University. --
28 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
30 ------------------------------------------------------------------------------
32 -- This is a LynxOS version of this package.
34 separate (System.Task_Primitives.Operations)
35 package body Specific is
41 procedure Initialize (Environment_Task : Task_Id) is
42 pragma Warnings (Off, Environment_Task);
43 Result : Interfaces.C.int;
46 Result := st_keycreate (null, ATCB_Key'Access);
47 pragma Assert (Result = 0);
54 function Is_Valid_Task return Boolean is
55 Result : Interfaces.C.int;
56 Value : aliased System.Address;
58 Result := st_getspecific (ATCB_Key, Value'Address);
59 pragma Assert (Result = 0);
60 return (Value /= System.Null_Address);
67 procedure Set (Self_Id : Task_Id) is
68 Result : Interfaces.C.int;
71 Result := st_setspecific (ATCB_Key, To_Address (Self_Id));
72 pragma Assert (Result = 0);
79 -- To make Ada tasks and C threads interoperate better, we have added some
80 -- functionality to Self. Suppose a C main program (with threads) calls an
81 -- Ada procedure and the Ada procedure calls the tasking runtime system.
82 -- Eventually, a call will be made to self. Since the call is not coming
83 -- from an Ada task, there will be no corresponding ATCB.
85 -- What we do in Self is to catch references that do not come from
86 -- recognized Ada tasks, and create an ATCB for the calling thread.
88 -- The new ATCB will be "detached" from the normal Ada task master
89 -- hierarchy, much like the existing implicitly created signal-server
92 function Self return Task_Id is
93 Value : aliased System.Address;
95 Result : Interfaces.C.int;
96 pragma Unreferenced (Result);
99 Result := st_getspecific (ATCB_Key, Value'Address);
100 -- Is it OK not to check this result???
102 -- If the key value is Null, then it is a non-Ada task.
104 if Value /= System.Null_Address then
105 return To_Task_Id (Value);
107 return Register_Foreign_Thread;