Scheduler implementations, value+time record class and the standard factory class to return standard RxJava schedulers or wrap any Executor-based (thread pool) instances.


Schedulers Static factory methods for returning standard Scheduler instances. 
TestScheduler A special, non thread-safe scheduler for testing operators that require a scheduler without introducing real concurrency and allows manually advancing a virtual time. 
Timed<T> Holds onto a value along with time information.