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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S . --
-- S P E C I F I C --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
-- --
-- GNARL is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNARL; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This is a version for Solaris native threads
separate (System.Task_Primitives.Operations)
package body Specific is
----------------
-- Initialize --
----------------
procedure Initialize (Environment_Task : Task_Id) is
Result : Interfaces.C.int;
begin
Result := thr_setspecific (ATCB_Key, To_Address (Environment_Task));
pragma Assert (Result = 0);
end Initialize;
-------------------
-- Is_Valid_Task --
-------------------
function Is_Valid_Task return Boolean is
Unknown_Task : aliased System.Address;
Result : Interfaces.C.int;
begin
Result := thr_getspecific (ATCB_Key, Unknown_Task'Unchecked_Access);
pragma Assert (Result = 0);
return Unknown_Task /= System.Null_Address;
end Is_Valid_Task;
---------
-- Set --
---------
procedure Set (Self_Id : Task_Id) is
Result : Interfaces.C.int;
begin
Result := thr_setspecific (ATCB_Key, To_Address (Self_Id));
pragma Assert (Result = 0);
end Set;
----------
-- Self --
----------
-- To make Ada tasks and C threads interoperate better, we have
-- added some functionality to Self. Suppose a C main program
-- (with threads) calls an Ada procedure and the Ada procedure
-- calls the tasking run-time system. Eventually, a call will be
-- made to self. Since the call is not coming from an Ada task,
-- there will be no corresponding ATCB.
-- What we do in Self is to catch references that do not come
-- from recognized Ada tasks, and create an ATCB for the calling
-- thread.
-- The new ATCB will be "detached" from the normal Ada task
-- master hierarchy, much like the existing implicitly created
-- signal-server tasks.
function Self return Task_Id is
Result : Interfaces.C.int;
Self_Id : aliased System.Address;
begin
Result := thr_getspecific (ATCB_Key, Self_Id'Unchecked_Access);
pragma Assert (Result = 0);
if Self_Id = System.Null_Address then
return Register_Foreign_Thread;
else
return To_Task_Id (Self_Id);
end if;
end Self;
end Specific;
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