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/******************************** -*- C -*- ****************************
*
* Header file for asynchronous events
*
*
***********************************************************************/
/***********************************************************************
*
* Copyright 2001, 2002, 2006, 2008, 2009 Free Software Foundation, Inc.
* Written by Paolo Bonzini.
*
* This file is part of GNU Smalltalk.
*
* GNU Smalltalk 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.
*
* Linking GNU Smalltalk statically or dynamically with other modules is
* making a combined work based on GNU Smalltalk. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* In addition, as a special exception, the Free Software Foundation
* give you permission to combine GNU Smalltalk with free software
* programs or libraries that are released under the GNU LGPL and with
* independent programs running under the GNU Smalltalk virtual machine.
*
* You may copy and distribute such a system following the terms of the
* GNU GPL for GNU Smalltalk and the licenses of the other code
* concerned, provided that you include the source code of that other
* code when and as the GNU GPL requires distribution of source code.
*
* Note that people who make modified versions of GNU Smalltalk are not
* obligated to grant this special exception for their modified
* versions; it is their choice whether to do so. The GNU General
* Public License gives permission to release a modified version without
* this exception; this exception also makes it possible to release a
* modified version which carries forward this exception.
*
* GNU Smalltalk 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
* GNU Smalltalk; see the file COPYING. If not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
***********************************************************************/
#ifndef GST_EVENTS_H
#define GST_EVENTS_H
/* Array of semaphores associated to the C signals. */
extern volatile OOP _gst_sem_int_vec[NSIG]
ATTRIBUTE_HIDDEN;
/* Initialize the data structures used to hold information about
asynchronous events requested by Smalltalk programs. */
extern void _gst_init_async_events (void)
ATTRIBUTE_HIDDEN;
/* Arrange so that when the SIG signal arrives from the operating
system, SEMAPHOREOOP is signaled by the virtual machine. A
previous wait for the same signal, if any, are discarded. */
extern void _gst_async_interrupt_wait (OOP semaphoreOOP,
int sig)
ATTRIBUTE_HIDDEN;
/* These are defined in sysdep/.../events.c. */
/* Arrange so that after DELAY milliseconds SEMAPHOREOOP is signaled
by the virtual machine. Previous waits are discarded. */
extern void _gst_async_timed_wait (OOP semaphoreOOP,
int delay)
ATTRIBUTE_HIDDEN;
/* Answer whether a timeout has been scheduled and a semaphore was
passed to the virtual machine, to be signaled when the timer
fires. */
extern mst_Boolean _gst_is_timeout_programmed (void)
ATTRIBUTE_PURE
ATTRIBUTE_HIDDEN;
/* Check for asynchronously reported error conditions related to file
descriptor FD. */
extern int _gst_get_fd_error (int fd)
ATTRIBUTE_HIDDEN;
/* Fire and remove all I/O handlers for file descriptor FD. */
extern void _gst_remove_fd_polling_handlers (int fd)
ATTRIBUTE_HIDDEN;
/* Initialize the socket for asynchronous event notifications for the
kind of socket given by PASSIVE and on the file descriptor FD. */
extern void _gst_register_socket (int fd,
mst_Boolean passive)
ATTRIBUTE_HIDDEN;
/* Check whether I/O is possible on the FD file descriptor; COND is 0
to check for pending input, 1 to check for the possibility of doing
non-blocking output, 2 to check for pending exceptional situations
(such as out-of-band data). Answer -1 if there is an error (including
POLLHUP -- in that case errno is left to 0), 0 if I/O is impossible,
1 if possible. */
extern int _gst_sync_file_polling (int fd,
int cond)
ATTRIBUTE_HIDDEN;
/* Check whether I/O is possible on the FD file descriptor; COND is 0
to check for pending input, 1 to check for the possibility of doing
non-blocking output, 2 to check for pending exceptional situations
(such as out-of-band data). Answer -1 if there is an error (including
POLLHUP -- in that case errno is left to 0), 0 if I/O is impossible,
1 if possible. If 0 is answered, the virtual machine arranges things
so that when the given condition is true SEMAPHOREOOP is signaled.
Note: due to lack of support from many kernels, waiting for a
semaphore to be signaled when *output* is possible is risky and
known to works for sockets only. */
extern int _gst_async_file_polling (int fd,
int cond,
OOP semaphoreOOP)
ATTRIBUTE_HIDDEN;
/* Pause until a signal is received. */
extern void _gst_pause (void);
/* Wake up from a pause. */
extern void _gst_wakeup (void);
#endif /* GST_EVENTS_H */
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