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vmset.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                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_vmset(){}

#else

#include    "vmhdr.h"


/*    Set the control flags for a region.
**
**    Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94.
*/
#if __STD_C
int vmset(reg Vmalloc_t* vm, int flags, int on)
#else
int vmset(vm, flags, on)
reg Vmalloc_t*    vm;   /* region being worked on           */
int         flags;      /* flags must be in VM_FLAGS        */
int         on;   /* !=0 if turning on, else turning off    */
#endif
{
      reg int           mode;
      reg Vmdata_t*     vd = vm->data;

      if(flags == 0 && on == 0)
            return vd->mode;

      if(!(vd->mode&VM_TRUST) )
      {     if(ISLOCK(vd,0))
                  return 0;
            SETLOCK(vd,0);
      }

      mode = vd->mode;

      if(on)
            vd->mode |=  (flags&VM_FLAGS);
      else  vd->mode &= ~(flags&VM_FLAGS);

      if(vd->mode&(VM_TRACE|VM_MTDEBUG))
            vd->mode &= ~VM_TRUST;

      CLRLOCK(vd,0);

      return mode;
}

#endif

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