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diff --git a/src/grt/grt-unithread.ads b/src/grt/grt-unithread.ads
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+--  GHDL Run Time (GRT) - mono-thread version.
+--  Copyright (C) 2005 - 2014 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.
+--
+--  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.
+with System.Storage_Elements; --  Work around GNAT bug.
+pragma Unreferenced (System.Storage_Elements);
+with Grt.Signals; use Grt.Signals;
+with Grt.Stack2; use Grt.Stack2;
+with Grt.Stacks; use Grt.Stacks;
+
+package Grt.Unithread is
+   procedure Init;
+   procedure Finish;
+
+   type Parallel_Subprg_Acc is access procedure;
+   procedure Run_Parallel (Subprg : Parallel_Subprg_Acc);
+
+   --  Return the old value of LIST.all and store EL into LIST.all.
+   function Atomic_Insert (List : access Ghdl_Signal_Ptr; El : Ghdl_Signal_Ptr)
+                          return Ghdl_Signal_Ptr;
+
+   --  Return the old value.
+   function Atomic_Inc (Val : access Natural) return Natural;
+
+   --  Set and get the current process being executed by the thread.
+   procedure Set_Current_Process (Proc : Process_Acc);
+   function Get_Current_Process return Process_Acc;
+
+   --  The secondary stack for the thread.  In this implementation, there is
+   --  only one secondary stack, shared by all processes. This is allowed,
+   --  because a wait statement cannot appear within a function.  So at a wait
+   --  statement, the secondary stack must be empty.
+   function Get_Stack2 return Stack2_Ptr;
+   procedure Set_Stack2 (St : Stack2_Ptr);
+
+   --  The main stack.  This is initialized by STACK_INIT.
+   --  The return point.
+   function Get_Main_Stack return Stack_Type;
+   procedure Set_Main_Stack (St : Stack_Type);
+private
+   pragma Inline (Run_Parallel);
+   pragma Inline (Atomic_Insert);
+   pragma Inline (Atomic_Inc);
+   pragma Inline (Get_Stack2);
+   pragma Inline (Set_Stack2);
+
+   pragma Inline (Get_Main_Stack);
+   pragma Export (C, Set_Main_Stack, "grt_set_main_stack");
+
+   pragma Inline (Set_Current_Process);
+   pragma Inline (Get_Current_Process);
+
+end Grt.Unithread;