Fig 3The gate lockClick or Space: take a ticket38 holds · 3 queued · waited 10 s · load 11.67
Ticket in the vise: the gate run holding the lockSix session stations, the ticket rail, the gate vise and the smaller GPU visePoll clock: a tick per 5 s poll, a turn per 60 s log lineEvery gate run takes a FIFO ticket named by its start time and PID, only the oldest live ticket may take the lock (an atomic mkdir), and a ticket whose PID has died is swept when it reaches the head. The readout replays the wait and 1-minute load average logged at 35 hand-offs (0 to 3,460 s, load 5.11 to 21.81).