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[bpt/guile.git] / libguile / iselect.h

/* classes: h_files */

#ifndef ISELECTH
#define ISELECTH

/*	Copyright (C) 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.  
 */

#include "libguile/__scm.h"

/* Needed for FD_SET on some systems.  */
#include <sys/types.h>

# ifdef TIME_WITH_SYS_TIME
#  include <sys/time.h>
#  include <time.h>
# else
#  ifdef HAVE_SYS_TIME_H
#   include <sys/time.h>
#  else
#   ifdef HAVE_TIME_H
#    include <time.h>
#   endif
#  endif
# endif

#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif

#ifdef FD_SET

#define SELECT_TYPE fd_set
#define SELECT_SET_SIZE FD_SETSIZE

#else /* no FD_SET */

/* Define the macros to access a single-int bitmap of descriptors.  */
#define SELECT_SET_SIZE 32
#define SELECT_TYPE int
#define FD_SET(n, p) (*(p) |= (1 << (n)))
#define FD_CLR(n, p) (*(p) &= ~(1 << (n)))
#define FD_ISSET(n, p) (*(p) & (1 << (n)))
#define FD_ZERO(p) (*(p) = 0)

#endif /* no FD_SET */

extern int scm_internal_select (int fds,
				SELECT_TYPE *rfds,
				SELECT_TYPE *wfds,
				SELECT_TYPE *efds,
				struct timeval *timeout);

#ifdef GUILE_ISELECT

extern int scm_I_am_dead;

extern void scm_error_revive_threads (void);
extern void scm_init_iselect (void);

#endif /* GUILE_ISELECT */

#endif