If called by a ForkJoinTask operating in this pool, equivalent
in effect to {@link ForkJoinTask#helpQuiesce}. Otherwise,
waits and/or attempts to assist performing tasks until this
pool {@link #isQuiescent} or the indicated timeout elapses.
@param timeout the maximum time to wait
@param unit the time unit of the timeout argument
@return {@code true} if quiescent; {@code false} if the
timeout elapsed.
If called by a ForkJoinTask operating in this pool, equivalent in effect to {@link ForkJoinTask#helpQuiesce}. Otherwise, waits and/or attempts to assist performing tasks until this pool {@link #isQuiescent} or the indicated timeout elapses.
@param timeout the maximum time to wait @param unit the time unit of the timeout argument @return {@code true} if quiescent; {@code false} if the timeout elapsed.