| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- |
| -- -- |
| -- SYSTEM.TASK_PRIMITIVES.OPERATIONS.REGISTER_FOREIGN_THREAD -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2002-2011, 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. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with System.Task_Info; |
| -- Use for Unspecified_Task_Info |
| |
| with System.Soft_Links; |
| -- used to initialize TSD for a C thread, in function Self |
| |
| with System.Multiprocessors; |
| |
| 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, System.Multiprocessors.Not_A_Specific_CPU, null, |
| 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; |
| |
| -- We do not provide an alternate stack for foreign threads |
| |
| Self_Id.Common.Task_Alternate_Stack := Null_Address; |
| |
| 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; |
