epoll select dispatcher to use. If null is supplied, the global theScheduler.epoll() instance will be used instead (see schedule() / stopTimeout())
limit on the number of events which can be managed by the scheduler at one time. (0 = no limit)
use this bucket element allocator for the expiry registration to ISelectClient map. If it is null the default map allocator (BucketElementGCAllocator) is used.
Constructor.