common/vmalloc/vmclear.c

	vmclear.c revision 3e14f97f673e8a630f076077de35afdd43dc1587
/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#if defined(_UWIN) && defined(_BLD_ast)

void _STUB_vmclear(){}

#else

#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
int 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;
    reg int     inuse;

    SETINUSE(vd, inuse);
    if(!(vd->mode&VM_TRUST) )
    {   if(ISLOCK(vd,0))
        {   CLRINUSE(vd, inuse);
            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 - ((Vmuchar_t*)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);
    CLRINUSE(vd, inuse);
    return 0;
}

#endif