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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2009, 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. --
-- 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
pragma Unreferenced (Environment_Task);
Result : Interfaces.C.int;
begin
Result := thr_keycreate (ATCB_Key'Access, System.Null_Address);
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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