usr/src/lib/libast/common/vmalloc/vmset.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_vmset(){}
  25
  26 #else
  27
  28 #include        "vmhdr.h"
  29
  30
  31 /*      Set the control flags for a region.
  32 **
  33 **      Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94.
  34 */
  35 #if __STD_C
  36 int vmset(reg Vmalloc_t* vm, int flags, int on)
  37 #else
  38 int vmset(vm, flags, on)
  39 reg Vmalloc_t*  vm;     /* region being worked on               */
  40 int             flags;  /* flags must be in VM_FLAGS            */
  41 int             on;     /* !=0 if turning on, else turning off  */
  42 #endif
  43 {
  44         reg int         mode, inuse;
  45         reg Vmdata_t*   vd = vm->data;
  46
  47         if(flags == 0 && on == 0)
  48                 return vd->mode;
  49
  50         SETINUSE(vd, inuse);
  51         if(!(vd->mode&VM_TRUST) )
  52         {       if(ISLOCK(vd,0))
  53                 {       CLRINUSE(vd, inuse);
  54                         return 0;
  55                 }
  56                 SETLOCK(vd,0);
  57         }
  58
  59         mode = vd->mode;
  60
  61         if(on)
  62                 vd->mode |=  (flags&VM_FLAGS);
  63         else    vd->mode &= ~(flags&VM_FLAGS);
  64
  65         if(vd->mode&(VM_TRACE|VM_MTDEBUG))
  66                 vd->mode &= ~VM_TRUST;
  67
  68         CLRLOCK(vd,0);
  69         CLRINUSE(vd, inuse);
  70
  71         return mode;
  72 }
  73
  74 #endif