/* Copyright (C) 1998, 1999 Aladdin Enterprises.  All rights reserved.
  
  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License version 2
  as published by the Free Software Foundation.


  This software is provided AS-IS with no warranty, either express or
  implied. That is, this program 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 this program; if not, write to the Free Software Foundation, Inc.,
  59 Temple Place, Suite 330, Boston, MA, 02111-1307.
  
  For more information about licensing, please refer to
  http://www.ghostscript.com/licensing/. For information on
  commercial licensing, go to http://www.artifex.com/licensing/ or
  contact Artifex Software, Inc., 101 Lucas Valley Road #110,
  San Rafael, CA  94903, U.S.A., +1(415)492-9861.
*/

/* $Id: gp_nsync.c,v 1.4 2002/02/21 22:24:52 giles Exp $ */
/* Dummy thread / semaphore / monitor implementation */
#include "std.h"
#include "gserror.h"
#include "gserrors.h"
#include "gpsync.h"

/* ------- Synchronization primitives -------- */

/* Semaphores */

uint
gp_semaphore_sizeof(void)
{
    return sizeof(gp_semaphore);
}

int
gp_semaphore_open(gp_semaphore * sema)
{
    if (sema)
	*(int *)sema = 0;
    return 0;
}

int
gp_semaphore_close(gp_semaphore * sema)
{
    return 0;
}

int
gp_semaphore_wait(gp_semaphore * sema)
{
    if (*(int *)sema == 0)
	return_error(gs_error_unknownerror); /* no real waiting */
    --(*(int *)sema);
    return 0;
}

int
gp_semaphore_signal(gp_semaphore * sema)
{
    ++(*(int *)sema);
    return 0;
}

/* Monitors */

uint
gp_monitor_sizeof(void)
{
    return sizeof(gp_monitor);
}

int
gp_monitor_open(gp_monitor * mon)
{
    if (mon)
	mon->dummy_ = 0;
    return 0;
}

int
gp_monitor_close(gp_monitor * mon)
{
    return 0;
}

int
gp_monitor_enter(gp_monitor * mon)
{
    if (mon->dummy_ != 0)
	return_error(gs_error_unknownerror);
    mon->dummy_ = mon;
    return 0;
}

int
gp_monitor_leave(gp_monitor * mon)
{
    if (mon->dummy_ != mon)
	return_error(gs_error_unknownerror);
    mon->dummy_ = 0;
    return 0;
}

/* Thread creation */

int
gp_create_thread(gp_thread_creation_callback_t proc, void *proc_data)
{
    return_error(gs_error_unknownerror);
}
