void main_loop_wait(int timeout) { IOHandlerRecord *ioh; fd_set rfds, wfds, xfds; int ret, nfds; struct timeval tv; qemu_bh_update_timeout(&timeout); host_main_loop_wait(&timeout); /* poll any events */ /* XXX: separate device handlers from system ones */ nfds = -1; FD_ZERO(&rfds); FD_ZERO(&wfds); FD_ZERO(&xfds); for(ioh = first_io_handler; ioh != NULL; ioh = ioh->next) { if (ioh->deleted) continue; if (ioh->fd_read && (!ioh->fd_read_poll || ioh->fd_read_poll(ioh->opaque) != 0)) { FD_SET(ioh->fd, &rfds); if (ioh->fd > nfds) nfds = ioh->fd; } if (ioh->fd_write) { FD_SET(ioh->fd, &wfds); if (ioh->fd > nfds) nfds = ioh->fd; } } tv.tv_sec = timeout / 1000; tv.tv_usec = (timeout % 1000) * 1000; slirp_select_fill(&nfds, &rfds, &wfds, &xfds); qemu_mutex_unlock_iothread(); ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv); qemu_mutex_lock_iothread(); if (ret > 0) { IOHandlerRecord **pioh; for(ioh = first_io_handler; ioh != NULL; ioh = ioh->next) { if (!ioh->deleted && ioh->fd_read && FD_ISSET(ioh->fd, &rfds)) { ioh->fd_read(ioh->opaque); } if (!ioh->deleted && ioh->fd_write && FD_ISSET(ioh->fd, &wfds)) { ioh->fd_write(ioh->opaque); } } /* remove deleted IO handlers */ pioh = &first_io_handler; while (*pioh) { ioh = *pioh; if (ioh->deleted) { *pioh = ioh->next; qemu_free(ioh); } else pioh = &ioh->next; } } slirp_select_poll(&rfds, &wfds, &xfds, (ret < 0)); /* rearm timer, if not periodic */ if (alarm_timer->flags & ALARM_FLAG_EXPIRED) { alarm_timer->flags &= ~ALARM_FLAG_EXPIRED; qemu_rearm_alarm_timer(alarm_timer); } /* vm time timers */ if (vm_running) { if (!cur_cpu || likely(!(cur_cpu->singlestep_enabled & SSTEP_NOTIMER))) qemu_run_timers(&active_timers[QEMU_TIMER_VIRTUAL], qemu_get_clock(vm_clock)); } /* real time timers */ qemu_run_timers(&active_timers[QEMU_TIMER_REALTIME], qemu_get_clock(rt_clock)); /* Check bottom-halves last in case any of the earlier events triggered them. */ qemu_bh_poll(); }