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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--                         G N A T . T H R E A D S                          --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--                    Copyright (C) 1998-2010, AdaCore                      --

--                                                                          --

-- GNAT 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/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Ada.Task_Identification; use Ada.Task_Identification;

with System.Task_Primitives.Operations;

with System.Tasking;

with System.Tasking.Stages;   use System.Tasking.Stages;

with System.OS_Interface;     use System.OS_Interface;

with System.Soft_Links;       use System.Soft_Links;

with Ada.Unchecked_Conversion;

package body GNAT.Threads is

   use System;

   package STPO renames System.Task_Primitives.Operations;

   type Thread_Id_Ptr is access all Thread_Id;

   pragma Warnings (Off);

   --  The following unchecked conversions are aliasing safe, since they

   --  are never used to create pointers to improperly aliased data.

   function To_Addr is new Ada.Unchecked_Conversion (Task_Id, Address);

   function To_Id   is new Ada.Unchecked_Conversion (Address, Task_Id);

   function To_Id   is new Ada.Unchecked_Conversion (Address, Tasking.Task_Id);

   function To_Tid  is new Ada.Unchecked_Conversion

     (Address, Ada.Task_Identification.Task_Id);

   function To_Thread is new Ada.Unchecked_Conversion (Address, Thread_Id_Ptr);

   pragma Warnings (On);

   type Code_Proc is access procedure (Id : Address; Parm : Void_Ptr);

   task type Thread

     (Stsz : Natural;

      Prio : Any_Priority;

      Parm : Void_Ptr;

      Code : Code_Proc)

   is

      pragma Priority (Prio);

      pragma Storage_Size (Stsz);

   end Thread;

   task body Thread is

   begin

      Code.all (To_Addr (Current_Task), Parm);

   end Thread;

   type Tptr is access Thread;

   -------------------

   -- Create_Thread --

   -------------------

   function Create_Thread

     (Code : Address;

      Parm : Void_Ptr;

      Size : Natural;

      Prio : Integer) return System.Address

   is

      TP : Tptr;

      function To_CP is new Ada.Unchecked_Conversion (Address, Code_Proc);

   begin

      TP := new Thread (Size, Prio, Parm, To_CP (Code));

      return To_Addr (TP'Identity);

   end Create_Thread;

   ---------------------

   -- Register_Thread --

   ---------------------

   function Register_Thread return System.Address is

   begin

      return Task_Primitives.Operations.Register_Foreign_Thread.all'Address;

   end Register_Thread;

   -----------------------

   -- Unregister_Thread --

   -----------------------

   procedure Unregister_Thread is

      Self_Id : constant Tasking.Task_Id := Task_Primitives.Operations.Self;

   begin

      Self_Id.Common.State := Tasking.Terminated;

      Destroy_TSD (Self_Id.Common.Compiler_Data);

      Free_Task (Self_Id);

   end Unregister_Thread;

   --------------------------

   -- Unregister_Thread_Id --

   --------------------------

   procedure Unregister_Thread_Id (Thread : System.Address) is

      Thr : constant Thread_Id := To_Thread (Thread).all;

      T   : Tasking.Task_Id;

      use type Tasking.Task_Id;

      --  This use clause should be removed once a visibility problem

      --  with the MaRTE run time has been fixed. ???

      pragma Warnings (Off);

      use type System.OS_Interface.Thread_Id;

      pragma Warnings (On);

   begin

      STPO.Lock_RTS;

      T := Tasking.All_Tasks_List;

      loop

         exit when T = null or else STPO.Get_Thread_Id (T) = Thr;

         T := T.Common.All_Tasks_Link;

      end loop;

      STPO.Unlock_RTS;

      if T /= null then

         T.Common.State := Tasking.Terminated;

         Destroy_TSD (T.Common.Compiler_Data);

         Free_Task (T);

      end if;

   end Unregister_Thread_Id;

   --------------------

   -- Destroy_Thread --

   --------------------

   procedure Destroy_Thread (Id : Address) is

      Tid : constant Task_Id := To_Id (Id);

   begin

      Abort_Task (Tid);

   end Destroy_Thread;

   ----------------

   -- Get_Thread --

   ----------------

   procedure Get_Thread (Id : Address; Thread : Address) is

      Thr : constant Thread_Id_Ptr := To_Thread (Thread);

   begin

      Thr.all := Task_Primitives.Operations.Get_Thread_Id (To_Id (Id));

   end Get_Thread;

   ----------------

   -- To_Task_Id --

   ----------------

   function To_Task_Id

     (Id : System.Address) return Ada.Task_Identification.Task_Id

   is

   begin

      return To_Tid (Id);

   end To_Task_Id;

end GNAT.Threads;