/* classes: h_files */

#ifndef COOP_THREADSH
#define COOP_THREADSH

/*	Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
 * 
 * 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, 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for GUILE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.  */


/* This file is only included by coop-threads.c while coop-defs.h is
   included by threads.h, which, in turn, is included by
   libguile.h. */

/* The coop_t struct is declared in coop-defs.h. */

#include "libguile/__scm.h"

#include <time.h>

#include "coop-defs.h"
#include "../qt/qt.h"

/* This code is based on a sample thread libraru by David Keppel.
   Portions of this file fall under the following copyright: */

/*
 * QuickThreads -- Threads-building toolkit.
 * Copyright (c) 1993 by David Keppel
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation for any purpose and without fee is hereby
 * granted, provided that the above copyright notice and this notice
 * appear in all copies.  This software is provided as a
 * proof-of-concept and for demonstration purposes; there is no
 * representation about the suitability of this software for any
 * purpose.
 */

/* Each thread starts by calling a user-supplied function of this
   type. */

typedef void (coop_userf_t)(void *p0);

/* Call this before any other primitives. */
extern void coop_init (void);

/* When one or more threads are created by the main thread,
   the system goes multithread when this is called.  It is done
   (no more runable threads) when this returns. */

extern void coop_start (void);

/* Create a thread and make it runable.  When the thread starts
   running it will call `f' with arguments `p0' and `p1'. */

extern coop_t *coop_create (coop_userf_t *f, void *p0);

/* The current thread stops running but stays runable.
   It is an error to call `coop_yield' before `coop_start'
   is called or after `coop_start' returns. */

extern void coop_yield (void);

/* Like `coop_yield' but the thread is discarded.  Any intermediate
   state is lost.  The thread can also terminate by simply
   returning. */

extern void coop_abort (void);

/* The following are needed in iselect.c */

extern coop_t *coop_qget (coop_q_t *);
extern void coop_qput (coop_q_t *, coop_t *);
extern void *coop_sleephelp (qt_t *, void *, void *);

#ifdef GUILE_ISELECT
extern coop_t *coop_wait_for_runnable_thread ();
#endif

extern coop_q_t coop_global_runq;	/* A queue of runable threads. */
extern coop_q_t coop_global_sleepq;
extern coop_q_t coop_tmp_queue;
extern coop_q_t coop_global_allq;	/* A queue of all threads. */
extern coop_t *coop_global_curr;       	/* Currently-executing thread. */

#endif /* COOP_THREADSH */