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Type Reason Java.Lang.IllegalStateException if attempting to register more than the maximum supported number of parties
Adds a new unarrived party to this phaser. If an ongoing invocation of Phaser.OnAdvance(int, System.Int32) is in progress, this method may await its completion before returning. If this phaser has a parent, and this phaser previously had no registered parties, this child phaser is also registered with its parent. If this phaser is terminated, the attempt to register has no effect, and a negative value is returned.