File: vmdisc.c

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#include	"vmhdr.h"

/*	Change the discipline for a region.  The old discipline
**	is returned.  If the new discipline is NIL then the
**	discipline is not changed.
**
**	Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94.
*/
#if __STD_C
Vmdisc_t* vmdisc(Vmalloc_t* vm, Vmdisc_t* disc)
#else
Vmdisc_t* vmdisc(vm, disc)
Vmalloc_t*	vm;
Vmdisc_t*	disc;
#endif
{
	Vmdisc_t*	old = vm->disc;

	if(disc)
	{	if(disc->memoryf != old->memoryf)
			return NIL(Vmdisc_t*);
		if(old->exceptf &&
		   (*old->exceptf)(vm,VM_DISC,(Void_t*)disc,old) != 0 )
			return NIL(Vmdisc_t*);
		vm->disc = disc;
	}
	return old;
}