/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997, 2012 Oracle and/or its affiliates.  All rights reserved.
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 * $Id$
 */

#include "db_config.h"

#include "db_int.h"

#ifdef HAVE_SYSTEM_INCLUDE_FILES
#if defined(HAVE_PSTAT_GETDYNAMIC)
#include <sys/pstat.h>
#endif
#endif

/*
 * __os_cpu_count --
 *	Return the number of CPUs.
 *
 * PUBLIC: u_int32_t __os_cpu_count __P((void));
 */
u_int32_t
__os_cpu_count()
{
#if defined(HAVE_PSTAT_GETDYNAMIC)
	/*
	 * HP/UX.
	 */
	struct pst_dynamic psd;

	return ((u_int32_t)pstat_getdynamic(&psd,
	    sizeof(psd), (size_t)1, 0) == -1 ? 1 : psd.psd_proc_cnt);
#elif defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
	/*
	 * Solaris, Linux.
	 */
	long nproc;

	nproc = sysconf(_SC_NPROCESSORS_ONLN);
	return ((u_int32_t)(nproc > 1 ? nproc : 1));
#else
	return (1);
#endif
}