Merge "init: don't wait if we have more work to do"

        // By default, sleep until something happens.

        int epoll_timeout_ms = -1;

        // If there's more work to do, wake up again immediately.

        if (am.HasMoreCommands()) epoll_timeout_ms = 0;

        // If there's a process that needs restarting, wake up in time for that.

        if (process_needs_restart_at != 0) {

            epoll_timeout_ms = (process_needs_restart_at - time(nullptr)) * 1000;

            if (epoll_timeout_ms < 0) epoll_timeout_ms = 0;

        }

        // If there's more work to do, wake up again immediately.

        if (am.HasMoreCommands()) epoll_timeout_ms = 0;

        bootchart_sample(&epoll_timeout_ms);

        epoll_event ev;