gcc/m2/gm2-libs-iso/RTco.def

   1 (* RTco.def provides minimal access to thread primitives.
   2
   3 Copyright (C) 2019-2024 Free Software Foundation, Inc.
   4 Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
   5
   6 This file is part of GNU Modula-2.
   7
   8 GNU Modula-2 is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GNU Modula-2 is distributed in the hope that it will be useful, but
  14 WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  *)
  26
  27 DEFINITION MODULE FOR "C" RTco ;
  28
  29 FROM SYSTEM IMPORT ADDRESS ;
  30
  31 IMPORT RTentity ;  (* Imported so the initialization call graph
  32                       understands that RTco.cc depends upon RTentity.  *)
  33
  34 (* init initializes the module and allows the application to lazily invoke threads.  *)
  35
  36 PROCEDURE init () : INTEGER ;
  37
  38 PROCEDURE initThread (p: PROC; stackSize: CARDINAL; interruptLevel: CARDINAL) : INTEGER ;
  39
  40 PROCEDURE initSemaphore (value: CARDINAL) : INTEGER ;
  41
  42 PROCEDURE wait (semaphore: INTEGER) ;
  43
  44 PROCEDURE signal (semaphore: INTEGER) ;
  45
  46 PROCEDURE transfer (VAR p1: INTEGER; p2: INTEGER) ;
  47
  48 PROCEDURE waitThread (tid: INTEGER) ;
  49
  50 PROCEDURE signalThread (tid: INTEGER) ;
  51
  52 PROCEDURE currentThread () : INTEGER ;
  53
  54
  55 (* currentInterruptLevel returns the interrupt level of the current thread.  *)
  56
  57 PROCEDURE currentInterruptLevel () : CARDINAL ;
  58
  59
  60 (* turninterrupts returns the old interrupt level and assigns the interrupt level
  61    to newLevel.  *)
  62
  63 PROCEDURE turnInterrupts (newLevel: CARDINAL) : CARDINAL ;
  64
  65
  66 (*
  67    select access to the select system call which will be thread safe.
  68    This is typically called from the idle process to wait for an interrupt.
  69 *)
  70
  71 PROCEDURE select (p1: INTEGER;
  72                   p2: ADDRESS;
  73                   p3: ADDRESS;
  74                   p4: ADDRESS;
  75                   p5: ADDRESS) : INTEGER ;
  76
  77
  78 END RTco.