libast/vmalloc/vmclear.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                 Eclipse Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*          http://www.eclipse.org/org/documents/epl-v10.html           *
*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
*                                                                      *
*              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
{
    Seg_t       *seg, *next;
    Block_t     *tp;
    size_t      size, s;
    Vmdata_t    *vd = vm->data;

    SETLOCK(vm, 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(vm, 0);

    return 0;
}

#endif