[foreign-memaccess] RFR: 8253243: Investigate ways to make MemorySegment::ofNativeRestricted more composable

[Ty Young]

On 9/16/20 9:56 AM, Maurizio Cimadamore wrote:
> MemoryAddress.NULL
>      .asSegmentRestricted(Long.MAX_VALUE)
>      .withOwnerThread(null)
>      .withAccessModes(READ | WRITE);
>

Is there any chance withOwnerThread could be changed so it doesn't 
accept a null? A null mutable Thread variable could unintentionally be 
interpreted as no-thread which may not be desirable.