RING_WAIT
ENGINE_READ(engine, RING_CTL) & (RING_WAIT | RING_WAIT_SEMAPHORE) ? " [waiting]" : "");
if ((regs[CTX_RING_CTL] & ~(RING_WAIT | RING_WAIT_SEMAPHORE)) !=
if (val & RING_WAIT)
busy = val & (RING_WAIT_SEMAPHORE | RING_WAIT);
itimer.it_value.tv_sec = RING_WAIT;