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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 . --
+-- R E G I S T E R _ F O R E I G N _ T H R E A D --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2002-2007, 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. --
+-- --
+------------------------------------------------------------------------------
+
+with System.Task_Info;
+-- Use for Unspecified_Task_Info
+
+with System.Soft_Links;
+-- used to initialize TSD for a C thread, in function Self
+
+separate (System.Task_Primitives.Operations)
+function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id is
+ Local_ATCB : aliased Ada_Task_Control_Block (0);
+ Self_Id : Task_Id;
+ Succeeded : Boolean;
+
+begin
+ -- This section is tricky. We must not call anything that might require
+ -- an ATCB, until the new ATCB is in place. In order to get an ATCB
+ -- immediately, we fake one, so that it is then possible to e.g allocate
+ -- memory (which might require accessing self).
+
+ -- Record this as the Task_Id for the thread
+
+ Local_ATCB.Common.LL.Thread := Thread;
+ Local_ATCB.Common.Current_Priority := System.Priority'First;
+ Specific.Set (Local_ATCB'Unchecked_Access);
+
+ -- It is now safe to use an allocator
+
+ Self_Id := new Ada_Task_Control_Block (0);
+
+ -- Finish initialization
+
+ Lock_RTS;
+ System.Tasking.Initialize_ATCB
+ (Self_Id, null, Null_Address, Null_Task,
+ Foreign_Task_Elaborated'Access,
+ System.Priority'First, Task_Info.Unspecified_Task_Info, 0, Self_Id,
+ Succeeded);
+ Unlock_RTS;
+ pragma Assert (Succeeded);
+
+ Self_Id.Master_of_Task := 0;
+ Self_Id.Master_Within := Self_Id.Master_of_Task + 1;
+
+ for L in Self_Id.Entry_Calls'Range loop
+ Self_Id.Entry_Calls (L).Self := Self_Id;
+ Self_Id.Entry_Calls (L).Level := L;
+ end loop;
+
+ Self_Id.Common.State := Runnable;
+ Self_Id.Awake_Count := 1;
+
+ Self_Id.Common.Task_Image (1 .. 14) := "foreign thread";
+ Self_Id.Common.Task_Image_Len := 14;
+
+ -- Since this is not an ordinary Ada task, we will start out undeferred
+
+ Self_Id.Deferral_Level := 0;
+
+ System.Soft_Links.Create_TSD (Self_Id.Common.Compiler_Data);
+
+ -- ???
+ -- The following call is commented out to avoid dependence on
+ -- the System.Tasking.Initialization package.
+ -- It seems that if we want Ada.Task_Attributes to work correctly
+ -- for C threads we will need to raise the visibility of this soft
+ -- link to System.Soft_Links.
+ -- We are putting that off until this new functionality is otherwise
+ -- stable.
+
+ -- System.Tasking.Initialization.Initialize_Attributes_Link.all (T);
+
+ Enter_Task (Self_Id);
+
+ return Self_Id;
+end Register_Foreign_Thread;