/***************************************************************************
                          lib/ibstop.c
                             -------------------

    copyright            : (C) 2003 by Frank Mori Hess
    email                : fmhess@users.sourceforge.net
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
#include "ib_internal.h"
#include <pthread.h>

int internal_ibstop(ibConf_t *conf)
{
	int retval;

	pthread_mutex_lock(&conf->async.lock);
	if (!conf->async.in_progress) {
		pthread_mutex_unlock(&conf->async.lock);
		return 0;
	}
	retval = pthread_cancel(conf->async.thread);
	if (retval) {
		pthread_mutex_unlock(&conf->async.lock);
		return 0;
	}
	pthread_mutex_unlock(&conf->async.lock);
	retval = gpib_aio_join(&conf->async);
	if (retval)
		return -1;
	pthread_mutex_lock(&conf->async.lock);
	conf->async.in_progress = 0;
	pthread_mutex_unlock(&conf->async.lock);

	setIberr(conf->async.iberr);
	setIbcnt(conf->async.ibcntl);

	return 0;
}

int ibstop(int ud)
{
	ibConf_t *conf;
	int retval;

	conf = general_enter_library(ud, 1, 1);
	if (!conf)
		return general_exit_library(ud, 1, 0, 0, 0, 0, 1);

	retval = internal_ibstop(conf);
	if (retval < 0)
		return general_exit_library(ud, 1, 0, 0, 0, 0, 1);

	return general_exit_library(ud, conf->async.ibsta & ERR, 0, 0, 0, 0, 1);
}
