/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#include "vmem_base.h"

#include "umem_base.h"

uint_t vmem_backend = 0;

vmem_t *

vmem_heap_arena(vmem_alloc_t **allocp, vmem_free_t **freep)

{

	static mutex_t arena_mutex = DEFAULTMUTEX;

	/*

	 * Allow the init thread through, block others until the init completes

	 */

	if (umem_ready != UMEM_READY && umem_init_thr != thr_self() &&

	    umem_init() == 0)

		return (NULL);

	(void) mutex_lock(&arena_mutex);

	if (vmem_heap == NULL)

		vmem_heap_init();

	(void) mutex_unlock(&arena_mutex);

	if (allocp != NULL)

		*allocp = vmem_heap_alloc;

	if (freep != NULL)

		*freep = vmem_heap_free;

	return (vmem_heap);

}