vmset.c   [plain text]

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                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