7.2.119 sleep-until

(sleep-until TIME)

Suspend reading commands from this stream until TIME (in seconds). Commands already read will still be executed; sleep-until inside progn won't delay execution of the rest of the progn's contents. Time is measured according to this stream's clock, as set by set-clock; if never set, the first sleep-until sets it to 0 (so initially (sleep-until TIME) is the same as (sleep-for TIME)). Returns the number of seconds until TIME.