eventpair - Mutually signalable pair of events for concurrent programming
Event Pairs are linked pairs of user-signalable objects. The 8 signal bits reserved for userspace (ZX_USER_SIGNAL_0 through ZX_USER_SIGNAL_7) may be set or cleared on the local or opposing endpoint of an Event Pair.
zx_eventpair_create()- create a connected pair of events
zx_object_signal_peer()- set or clear the user signals in the opposite end