ThreadTimeouts_tloTimeout Field

A thread-local containing the calling thread's timeout value. Values which are greater or equal to zero are used to indicate timeout timestamps. Negative values are relative timeouts which haven't yet been realized into a timestamp. This allows for an optimization where we can avoid obtaining the current time when "setting" the timeout, and defer it until we are about to block.

protected static ThreadLocal<ThreadTimeoutLongHolder> s_tloTimeout