106 lines
4.6 KiB
Ada
106 lines
4.6 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- SYSTEM.TASK_PRIMITIVES.OPERATIONS.REGISTER_FOREIGN_THREAD --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2002-2009, Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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with System.Task_Info;
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-- Use for Unspecified_Task_Info
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with System.Soft_Links;
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-- used to initialize TSD for a C thread, in function Self
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separate (System.Task_Primitives.Operations)
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function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id is
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Local_ATCB : aliased Ada_Task_Control_Block (0);
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Self_Id : Task_Id;
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Succeeded : Boolean;
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begin
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-- This section is tricky. We must not call anything that might require
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-- an ATCB, until the new ATCB is in place. In order to get an ATCB
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-- immediately, we fake one, so that it is then possible to e.g allocate
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-- memory (which might require accessing self).
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-- Record this as the Task_Id for the thread
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Local_ATCB.Common.LL.Thread := Thread;
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Local_ATCB.Common.Current_Priority := System.Priority'First;
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Specific.Set (Local_ATCB'Unchecked_Access);
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-- It is now safe to use an allocator
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Self_Id := new Ada_Task_Control_Block (0);
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-- Finish initialization
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Lock_RTS;
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System.Tasking.Initialize_ATCB
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(Self_Id, null, Null_Address, Null_Task,
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Foreign_Task_Elaborated'Access,
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System.Priority'First, Task_Info.Unspecified_Task_Info, 0, Self_Id,
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Succeeded);
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Unlock_RTS;
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pragma Assert (Succeeded);
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Self_Id.Master_of_Task := 0;
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Self_Id.Master_Within := Self_Id.Master_of_Task + 1;
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for L in Self_Id.Entry_Calls'Range loop
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Self_Id.Entry_Calls (L).Self := Self_Id;
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Self_Id.Entry_Calls (L).Level := L;
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end loop;
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Self_Id.Common.State := Runnable;
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Self_Id.Awake_Count := 1;
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Self_Id.Common.Task_Image (1 .. 14) := "foreign thread";
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Self_Id.Common.Task_Image_Len := 14;
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-- Since this is not an ordinary Ada task, we will start out undeferred
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Self_Id.Deferral_Level := 0;
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System.Soft_Links.Create_TSD (Self_Id.Common.Compiler_Data);
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-- ???
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-- The following call is commented out to avoid dependence on
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-- the System.Tasking.Initialization package.
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-- It seems that if we want Ada.Task_Attributes to work correctly
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-- for C threads we will need to raise the visibility of this soft
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-- link to System.Soft_Links.
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-- We are putting that off until this new functionality is otherwise
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-- stable.
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-- System.Tasking.Initialization.Initialize_Attributes_Link.all (T);
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Enter_Task (Self_Id);
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return Self_Id;
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end Register_Foreign_Thread;
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