1------------------------------------------------------------------------------
2--                                                                          --
3--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
4--                                                                          --
5--                SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC                --
6--                                                                          --
7--                                B o d y                                   --
8--                                                                          --
9--         Copyright (C) 1992-2018, 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-- 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.               --
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 a version for Solaris native threads
33
34separate (System.Task_Primitives.Operations)
35package body Specific is
36
37   ----------------
38   -- Initialize --
39   ----------------
40
41   procedure Initialize (Environment_Task : Task_Id) is
42      pragma Unreferenced (Environment_Task);
43      Result : Interfaces.C.int;
44   begin
45      Result := thr_keycreate (ATCB_Key'Access, System.Null_Address);
46      pragma Assert (Result = 0);
47   end Initialize;
48
49   -------------------
50   -- Is_Valid_Task --
51   -------------------
52
53   function Is_Valid_Task return Boolean is
54      Unknown_Task : aliased System.Address;
55      Result       : Interfaces.C.int;
56   begin
57      Result := thr_getspecific (ATCB_Key, Unknown_Task'Unchecked_Access);
58      pragma Assert (Result = 0);
59      return Unknown_Task /= System.Null_Address;
60   end Is_Valid_Task;
61
62   ---------
63   -- Set --
64   ---------
65
66   procedure Set (Self_Id : Task_Id) is
67      Result : Interfaces.C.int;
68   begin
69      Result := thr_setspecific (ATCB_Key, To_Address (Self_Id));
70      pragma Assert (Result = 0);
71   end Set;
72
73   ----------
74   -- Self --
75   ----------
76
77   --  To make Ada tasks and C threads interoperate better, we have
78   --  added some functionality to Self. Suppose a C main program
79   --  (with threads) calls an Ada procedure and the Ada procedure
80   --  calls the tasking run-time system. Eventually, a call will be
81   --  made to self. Since the call is not coming from an Ada task,
82   --  there will be no corresponding ATCB.
83
84   --  What we do in Self is to catch references that do not come
85   --  from recognized Ada tasks, and create an ATCB for the calling
86   --  thread.
87
88   --  The new ATCB will be "detached" from the normal Ada task
89   --  master hierarchy, much like the existing implicitly created
90   --  signal-server tasks.
91
92   function Self return Task_Id is
93      Result  : Interfaces.C.int;
94      Self_Id : aliased System.Address;
95   begin
96      Result := thr_getspecific (ATCB_Key, Self_Id'Unchecked_Access);
97      pragma Assert (Result = 0);
98
99      if Self_Id = System.Null_Address then
100         return Register_Foreign_Thread;
101      else
102         return To_Task_Id (Self_Id);
103      end if;
104   end Self;
105
106end Specific;
107