(* RTco.def provides minimal access to thread primitives.

Copyright (C) 2019-2025 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.

This file is part of GNU Modula-2.

GNU Modula-2 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 3, or (at your option)
any later version.

GNU Modula-2 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.

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/>.  *)

DEFINITION MODULE FOR "C" RTco ;

FROM SYSTEM IMPORT ADDRESS ;

IMPORT RTentity ;  (* Imported so the initialization call graph
                      understands that RTco.cc depends upon RTentity.  *)

(* init initializes the module and allows the application to lazily invoke threads.  *)

PROCEDURE init () : INTEGER ;

PROCEDURE initThread (p: PROC; stackSize: CARDINAL; interruptLevel: CARDINAL) : INTEGER ;

PROCEDURE initSemaphore (value: CARDINAL) : INTEGER ;

PROCEDURE wait (semaphore: INTEGER) ;

PROCEDURE signal (semaphore: INTEGER) ;

PROCEDURE transfer (VAR p1: INTEGER; p2: INTEGER) ;

PROCEDURE waitThread (tid: INTEGER) ;

PROCEDURE signalThread (tid: INTEGER) ;

PROCEDURE currentThread () : INTEGER ;


(* currentInterruptLevel returns the interrupt level of the current thread.  *)

PROCEDURE currentInterruptLevel () : CARDINAL ;


(* turninterrupts returns the old interrupt level and assigns the interrupt level
   to newLevel.  *)

PROCEDURE turnInterrupts (newLevel: CARDINAL) : CARDINAL ;


(*
   select access to the select system call which will be thread safe.
   This is typically called from the idle process to wait for an interrupt.
*)

PROCEDURE select (p1: INTEGER;
                  p2: ADDRESS;
                  p3: ADDRESS;
                  p4: ADDRESS;
                  p5: ADDRESS) : INTEGER ;


END RTco.
