Realtime threads with Swift

[tera]

@David_Smith

Side tables are used for weak references, and if the inline refcount overflows.

When does it overflow? on 2^8? 2^16? 2^32? 2^64?

Edit: found this old post, is this layout used now? So it is enough to retain an object 256 times when ref count overflows?

@gparker42

1 bit is nonpointer
1 bit has associated references
1 bit has destructor
44 bits class pointer
6 bits magic for tools
1 bit is weakly referenced
1 bit is deallocating
1 bit has additional refcount in side allocation
8 bits refcount