usr/src/lib/libast/common/vmalloc/vmclear.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #if defined(_UWIN) && defined(_BLD_ast)
  23
  24 void _STUB_vmclear(){}
  25
  26 #else
  27
  28 #include        "vmhdr.h"
  29
  30 /*      Clear out all allocated space.
  31 **
  32 **      Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94.
  33 */
  34 #if __STD_C
  35 int vmclear(Vmalloc_t* vm)
  36 #else
  37 int vmclear(vm)
  38 Vmalloc_t*      vm;
  39 #endif
  40 {
  41         reg Seg_t*      seg;
  42         reg Seg_t*      next;
  43         reg Block_t*    tp;
  44         reg size_t      size, s;
  45         reg Vmdata_t*   vd = vm->data;
  46         reg int         inuse;
  47
  48         SETINUSE(vd, inuse);
  49         if(!(vd->mode&VM_TRUST) )
  50         {       if(ISLOCK(vd,0))
  51                 {       CLRINUSE(vd, inuse);
  52                         return -1;
  53                 }
  54                 SETLOCK(vd,0);
  55         }
  56
  57         vd->free = vd->wild = NIL(Block_t*);
  58         vd->pool = 0;
  59
  60         if(vd->mode&(VM_MTBEST|VM_MTDEBUG|VM_MTPROFILE) )
  61         {       vd->root = NIL(Block_t*);
  62                 for(s = 0; s < S_TINY; ++s)
  63                         TINY(vd)[s] = NIL(Block_t*);
  64                 for(s = 0; s <= S_CACHE; ++s)
  65                         CACHE(vd)[s] = NIL(Block_t*);
  66         }
  67
  68         for(seg = vd->seg; seg; seg = next)
  69         {       next = seg->next;
  70
  71                 tp = SEGBLOCK(seg);
  72                 size = seg->baddr - ((Vmuchar_t*)tp) - 2*sizeof(Head_t);
  73
  74                 SEG(tp) = seg;
  75                 SIZE(tp) = size;
  76                 if((vd->mode&(VM_MTLAST|VM_MTPOOL)) )
  77                         seg->free = tp;
  78                 else
  79                 {       SIZE(tp) |= BUSY|JUNK;
  80                         LINK(tp) = CACHE(vd)[C_INDEX(SIZE(tp))];
  81                         CACHE(vd)[C_INDEX(SIZE(tp))] = tp;
  82                 }
  83
  84                 tp = BLOCK(seg->baddr);
  85                 SEG(tp) = seg;
  86                 SIZE(tp) = BUSY;
  87         }
  88
  89         CLRLOCK(vd,0);
  90         CLRINUSE(vd, inuse);
  91         return 0;
  92 }
  93
  94 #endif