| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNU ADA 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 -- |
| -- -- |
| -- $Revision: 1.2 $ |
| -- -- |
| -- Copyright (C) 1991-2003, Florida State University -- |
| -- Copyright (C) 2008-2012, 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 3, or (at your option) any later ver- -- |
| -- sion. GNAT 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. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNARL was developed by the GNARL team at Florida State University. It is -- |
| -- now maintained by Ada Core Technologies Inc. in cooperation with Florida -- |
| -- State University (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This is a RTEMS version of this package which uses a special |
| -- variable for Ada self which is context switched implicitly by RTEMS. |
| -- |
| -- This is the same as the POSIX version except that an RTEMS variable |
| -- is used instead of a POSIX key. |
| |
| separate (System.Task_Primitives.Operations) |
| package body Specific is |
| |
| -- The following gives the Ada run-time direct access to a variable |
| -- context switched by RTEMS at the lowest level. |
| |
| ATCB_Key : System.Address; |
| pragma Import (C, ATCB_Key, "rtems_ada_self"); |
| |
| ---------------- |
| -- Initialize -- |
| ---------------- |
| |
| procedure Initialize (Environment_Task : Task_Id) is |
| pragma Warnings (Off, Environment_Task); |
| |
| begin |
| ATCB_Key := To_Address (Environment_Task); |
| end Initialize; |
| |
| ------------------- |
| -- Is_Valid_Task -- |
| ------------------- |
| |
| function Is_Valid_Task return Boolean is |
| begin |
| return ATCB_Key /= System.Null_Address; |
| end Is_Valid_Task; |
| |
| --------- |
| -- Set -- |
| --------- |
| |
| procedure Set (Self_Id : Task_Id) is |
| begin |
| ATCB_Key := To_Address (Self_Id); |
| 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 runtime 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 : System.Address; |
| |
| begin |
| Result := ATCB_Key; |
| |
| -- If the key value is Null, then it is a non-Ada task. |
| |
| if Result /= System.Null_Address then |
| return To_Task_Id (Result); |
| else |
| return Register_Foreign_Thread; |
| end if; |
| end Self; |
| |
| end Specific; |
