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vmclear.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2009 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

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