int qemu_calculate_timeout(void) { #ifndef CONFIG_IOTHREAD int timeout; if (!vm_running) timeout = 5000; else { /* XXX: use timeout computed from timers */ int64_t add; int64_t delta; /* Advance virtual time to the next event. */ delta = qemu_icount_delta(); if (delta > 0) { /* If virtual time is ahead of real time then just wait for IO. */ timeout = (delta + 999999) / 1000000; } else { /* Wait for either IO to occur or the next timer event. */ add = qemu_next_deadline(); /* We advance the timer before checking for IO. Limit the amount we advance so that early IO activity won't get the guest too far ahead. */ if (add > 10000000) add = 10000000; delta += add; qemu_icount += qemu_icount_round (add); timeout = delta / 1000000; if (timeout < 0) timeout = 0; } } return timeout; #else /* CONFIG_IOTHREAD */ return 1000; #endif }