/* Copyright (C) 1998, 1999 artofcode LLC.  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 as published by the
  Free Software Foundation; either version 2 of the License, or (at your
  option) any later version.

  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.

*/

/*$Id: gp_nsync.c,v 1.2.6.1.2.1 2003/01/17 00:49:02 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);
}