/*

 * libringbuffer/smp.c

 *

 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; only

 * version 2.1 of the License.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#define _GNU_SOURCE

#include <unistd.h>

#include <pthread.h>

#include "smp.h"

int __num_possible_cpus;

void _get_num_possible_cpus(void)

{

	int result;

	/* On Linux, when some processors are offline

	 * _SC_NPROCESSORS_CONF counts the offline

	 * processors, whereas _SC_NPROCESSORS_ONLN

	 * does not. If we used _SC_NPROCESSORS_ONLN,

	 * getcpu() could return a value greater than

	 * this sysconf, in which case the arrays

	 * indexed by processor would overflow.

	 */

	result = sysconf(_SC_NPROCESSORS_CONF);

	if (result == -1)

		return;

	__num_possible_cpus = result;

}