pub type BandWaitFn = unsafe extern "C" fn(ctx: *mut c_void, us: u64) -> i32;Expand description
phase-509 P9b item 3 – how a band worker waits on its own wake object:
at most us microseconds, returning early when the object is signalled
(WorkerWakeFn). The answer is ignored: either way the worker re-scans.