/*
 * CDE - Common Desktop Environment
 *
 * Copyright (c) 1993-2012, The Open Group. All rights reserved.
 *
 * These libraries and programs are free software; you can
 * redistribute them and/or modify them under the terms of the GNU
 * Lesser General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * These libraries and programs are distributed in the hope that
 * they 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 these libraries and programs; if not, write
 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA 02110-1301 USA
 */
/* $XConsortium: vmclear.c /main/2 1996/05/08 20:01:27 drk $ */
/***************************************************************
*                                                              *
*                      AT&T - PROPRIETARY                      *
*                                                              *
*         THIS IS PROPRIETARY SOURCE CODE LICENSED BY          *
*                          AT&T CORP.                          *
*                                                              *
*                Copyright (c) 1995 AT&T Corp.                 *
*                     All Rights Reserved                      *
*                                                              *
*           This software is licensed by AT&T Corp.            *
*       under the terms and conditions of the license in       *
*       http://www.research.att.com/orgs/ssr/book/reuse        *
*                                                              *
*               This software was created by the               *
*           Software Engineering Research Department           *
*                    AT&T Bell Laboratories                    *
*                                                              *
*               For further information contact                *
*                     gsf@research.att.com                     *
*                                                              *
***************************************************************/
#include	"vmhdr.h"

/*	Clear out all allocated space.
**
**	Written by (Kiem-)Phong Vo, kpv@research.att.com, 01/16/94.
*/
#if __STD_C
int vmclear(Vmalloc_t* vm)
#else
vmclear(vm)
Vmalloc_t*	vm;
#endif
{
	reg Seg_t*	seg;
	reg Seg_t*	next;
	reg Block_t*	tp;
	reg size_t	size, s;
	reg Vmdata_t*	vd = vm->data;

	if(!(vd->mode&VM_TRUST) )
	{	if(ISLOCK(vd,0))
			return -1;
		SETLOCK(vd,0);
	}

	vd->free = vd->wild = NIL(Block_t*);
	vd->pool = 0;

	if(vd->mode&(VM_MTBEST|VM_MTDEBUG|VM_MTPROFILE) )
	{	vd->root = NIL(Block_t*);
		for(s = 0; s < S_TINY; ++s)
			TINY(vd)[s] = NIL(Block_t*);
		for(s = 0; s <= S_CACHE; ++s)
			CACHE(vd)[s] = NIL(Block_t*);
	}

	for(seg = vd->seg; seg; seg = next)
	{	next = seg->next;

		tp = SEGBLOCK(seg);
		size = seg->baddr - ((uchar*)tp) - 2*sizeof(Head_t);

		SEG(tp) = seg;
		SIZE(tp) = size;
		if((vd->mode&(VM_MTLAST|VM_MTPOOL)) )
			seg->free = tp;
		else
		{	SIZE(tp) |= BUSY|JUNK;
			LINK(tp) = CACHE(vd)[C_INDEX(SIZE(tp))];
			CACHE(vd)[C_INDEX(SIZE(tp))] = tp;
		}

		tp = BLOCK(seg->baddr);
		SEG(tp) = seg;
		SIZE(tp) = BUSY;
	}

	CLRLOCK(vd,0);
	return 0;
}