/* classes: h_files */

#ifndef THREADSH
#define THREADSH

/* Copyright (C) 1996, 1997, 1998, 2000 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.  */

/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
   gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */


#include "libguile/__scm.h"
#include "libguile/procs.h"
#include "libguile/throw.h"



/* smob tags for the thread datatypes */
extern long scm_tc16_thread;
extern long scm_tc16_mutex;
extern long scm_tc16_condvar;

#define SCM_THREADP(x) (!SCM_IMP (x) && (SCM_TYP16 (x) == scm_tc16_thread))
#define SCM_THREAD_DATA(x) ((void *) SCM_CELL_WORD_1 (x))

#define SCM_MUTEXP(x) (!SCM_IMP (x) && (SCM_TYP16 (x) == scm_tc16_mutex))
#define SCM_MUTEX_DATA(x) ((void *) SCM_CELL_WORD_1 (x))

#define SCM_CONDVARP(x) (!SCM_IMP (x) && (SCM_TYP16 (x) == scm_tc16_condvar))
#define SCM_CONDVAR_DATA(x) ((void *) SCM_CELL_WORD_1 (x))

/* Initialize implementation specific details of the threads support */
void scm_threads_init (SCM_STACKITEM *);
void scm_threads_mark_stacks (void);
void scm_init_threads (SCM_STACKITEM *);

/* */
SCM scm_threads_make_mutex (void);
SCM scm_threads_lock_mutex (SCM);
SCM scm_threads_unlock_mutex (SCM);
SCM scm_threads_monitor (void);

SCM scm_spawn_thread (scm_catch_body_t body, void *body_data,
		      scm_catch_handler_t handler, void *handler_data);

/* These are versions of the ordinary sleep and usleep functions,
   that play nicely with the thread system.  */
unsigned long scm_thread_sleep (unsigned long);
unsigned long scm_thread_usleep (unsigned long);


/* The C versions of the Scheme-visible thread functions.  */
#ifdef USE_COOP_THREADS
extern SCM scm_single_thread_p (void);
#endif
extern SCM scm_yield (void);
extern SCM scm_call_with_new_thread (SCM argl);
extern SCM scm_join_thread (SCM t);
extern SCM scm_make_mutex (void);
extern SCM scm_lock_mutex (SCM m);
extern SCM scm_unlock_mutex (SCM m);
extern SCM scm_make_condition_variable (void);
extern SCM scm_wait_condition_variable (SCM cond, SCM mutex);
extern SCM scm_signal_condition_variable (SCM cond);

#ifdef USE_COOP_THREADS
#include "libguile/coop-defs.h"
#endif

#endif  /* THREADSH */

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/
