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diff --git a/translate/grt/grt-unithread.adb b/translate/grt/grt-unithread.adb
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+++ b/translate/grt/grt-unithread.adb
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+--  GHDL Run Time (GRT) - mono-thread version.
+--  Copyright (C) 2005 Tristan Gingold
+--
+--  GHDL is free software; you can redistribute it and/or modify it under
+--  the terms of the GNU General Public License as published by the Free
+--  Software Foundation; either version 2, or (at your option) any later
+--  version.
+--
+--  GHDL is distributed in the hope that it will be useful, but WITHOUT 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
+--  along with GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+with Grt.Types; use Grt.Types;
+
+package body Grt.Unithread is
+   procedure Init is
+   begin
+      null;
+   end Init;
+
+   procedure Finish is
+   begin
+      null;
+   end Finish;
+
+   procedure Run_Parallel (Subprg : Parallel_Subprg_Acc) is
+   begin
+      Subprg.all;
+   end Run_Parallel;
+
+   function Atomic_Insert (List : access Ghdl_Signal_Ptr; El : Ghdl_Signal_Ptr)
+                          return Ghdl_Signal_Ptr
+   is
+      Prev : Ghdl_Signal_Ptr;
+   begin
+      Prev := List.all;
+      List.all := El;
+      return Prev;
+   end Atomic_Insert;
+
+   function Atomic_Inc (Val : access Natural) return Natural
+   is
+      Res : Natural;
+   begin
+      Res := Val.all;
+      Val.all := Val.all + 1;
+      return Res;
+   end Atomic_Inc;
+
+   Current_Process : Process_Acc;
+   Current_Process_Id : Process_Id;
+
+   --  Called by linux.c
+   function Grt_Get_Current_Process return Process_Acc;
+   pragma Export (C, Grt_Get_Current_Process);
+
+   function Grt_Get_Current_Process return Process_Acc is
+   begin
+      return Current_Process;
+   end Grt_Get_Current_Process;
+
+
+   procedure Set_Current_Process (Id : Process_Id; Proc : Process_Acc) is
+   begin
+      Current_Process := Proc;
+      Current_Process_Id := Id;
+   end Set_Current_Process;
+
+   function Get_Current_Process return Process_Acc is
+   begin
+      return Current_Process;
+   end Get_Current_Process;
+
+   function Get_Current_Process_Id return Process_Id is
+   begin
+      return Current_Process_Id;
+   end Get_Current_Process_Id;
+
+   Stack2 : Stack2_Ptr;
+
+   function Get_Stack2 return Stack2_Ptr is
+   begin
+      return Stack2;
+   end Get_Stack2;
+
+   procedure Set_Stack2 (St : Stack2_Ptr) is
+   begin
+      Stack2 := St;
+   end Set_Stack2;
+
+   Main_Stack : Stack_Type;
+
+   function Get_Main_Stack return Stack_Type is
+   begin
+      return Main_Stack;
+   end Get_Main_Stack;
+
+   procedure Set_Main_Stack (St : Stack_Type) is
+   begin
+      Main_Stack := St;
+   end Set_Main_Stack;
+end Grt.Unithread;