1 ------------------------------------------------------------------------------
3 -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC --
9 -- Copyright (C) 1992-2004, 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 2, or (at your option) any later ver- --
14 -- sion. GNARL 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is a LynxOS version of this package.
36 separate (System.Task_Primitives.Operations)
37 package body Specific is
43 procedure Initialize (Environment_Task : Task_Id) is
44 pragma Warnings (Off, Environment_Task);
45 Result : Interfaces.C.int;
48 Result := st_keycreate (null, ATCB_Key'Access);
49 pragma Assert (Result = 0);
56 function Is_Valid_Task return Boolean is
57 Result : Interfaces.C.int;
58 Value : aliased System.Address;
60 Result := st_getspecific (ATCB_Key, Value'Address);
61 pragma Assert (Result = 0);
62 return (Value /= System.Null_Address);
69 procedure Set (Self_Id : Task_Id) is
70 Result : Interfaces.C.int;
73 Result := st_setspecific (ATCB_Key, To_Address (Self_Id));
74 pragma Assert (Result = 0);
81 -- To make Ada tasks and C threads interoperate better, we have added some
82 -- functionality to Self. Suppose a C main program (with threads) calls an
83 -- Ada procedure and the Ada procedure calls the tasking runtime system.
84 -- Eventually, a call will be made to self. Since the call is not coming
85 -- from an Ada task, there will be no corresponding ATCB.
87 -- What we do in Self is to catch references that do not come from
88 -- recognized Ada tasks, and create an ATCB for the calling thread.
90 -- The new ATCB will be "detached" from the normal Ada task master
91 -- hierarchy, much like the existing implicitly created signal-server
94 function Self return Task_Id is
95 Value : aliased System.Address;
97 Result : Interfaces.C.int;
98 pragma Unreferenced (Result);
101 Result := st_getspecific (ATCB_Key, Value'Address);
102 -- Is it OK not to check this result???
104 -- If the key value is Null, then it is a non-Ada task.
106 if Value /= System.Null_Address then
107 return To_Task_Id (Value);
109 return Register_Foreign_Thread;