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) 1992-2009, 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 LynxOS version of this package. 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 Warnings (Off, Environment_Task); 43 Result : Interfaces.C.int; 44 45 begin 46 Result := st_keycreate (null, ATCB_Key'Access); 47 pragma Assert (Result = 0); 48 end Initialize; 49 50 ------------------- 51 -- Is_Valid_Task -- 52 ------------------- 53 54 function Is_Valid_Task return Boolean is 55 Result : Interfaces.C.int; 56 Value : aliased System.Address; 57 begin 58 Result := st_getspecific (ATCB_Key, Value'Address); 59 pragma Assert (Result = 0); 60 return (Value /= System.Null_Address); 61 end Is_Valid_Task; 62 63 --------- 64 -- Set -- 65 --------- 66 67 procedure Set (Self_Id : Task_Id) is 68 Result : Interfaces.C.int; 69 70 begin 71 Result := st_setspecific (ATCB_Key, To_Address (Self_Id)); 72 pragma Assert (Result = 0); 73 end Set; 74 75 ---------- 76 -- Self -- 77 ---------- 78 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. 84 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. 87 88 -- The new ATCB will be "detached" from the normal Ada task master 89 -- hierarchy, much like the existing implicitly created signal-server 90 -- tasks. 91 92 function Self return Task_Id is 93 Value : aliased System.Address; 94 95 Result : Interfaces.C.int; 96 pragma Unreferenced (Result); 97 98 begin 99 Result := st_getspecific (ATCB_Key, Value'Address); 100 -- Is it OK not to check this result??? 101 102 -- If the key value is Null, then it is a non-Ada task. 103 104 if Value /= System.Null_Address then 105 return To_Task_Id (Value); 106 else 107 return Register_Foreign_Thread; 108 end if; 109 end Self; 110 111end Specific; 112