RacerDDomain.ThreadsDomainAbstraction of threads that may run in parallel with the current thread. NoThread < AnyThreadExceptSelf < AnyThread
type t = | NoThreadNo threads can run in parallel with the current thread (concretization: empty set). We assume this by default unless we see evidence to the contrary (annotations, use of locks, etc.)
*)| AnyThreadButSelfCurrent thread can run in parallel with other threads, but not with a copy of itself. (concretization : { t | t \in TIDs && t != t_cur })
| AnyThreadCurrent thread can run in parallel with any thread, including itself (concretization: set of all TIDs )
*)return true if two accesses with these thread values can run concurrently
val is_any : t -> bool