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yes, sorry, I meant WaitOnAddress. I thought they were also called keyed events (or at least that was the NT name) but I might be wrong.

Keyed event is older thing, somewhat similar but lacks value comparison.

WaitOnAddress() allows 32 or 64 bit addresses. "[in] AddressSize The size of the value, in bytes. This parameter can be 1, 2, 4, or 8."

Thank god there's no Linus at MSFT to pointlessly veto 64-bit futex support.