------------------------------------------------------------------------------ -- -- -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- SYSTEM.TASK_PRIMITIVES.OPERATIONS.REGISTER_FOREIGN_THREAD -- -- -- -- B o d y -- -- -- -- Copyright (C) 2002-2005, 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, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, 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; use type Interfaces.C.unsigned; 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;