Merge pull request #1830 from aaugustin/instant-reload-os-x

except ImportError:

    pass

try:

    import select

    select.kevent, select.kqueue

    USE_KQUEUE = True

    import resource

    NOFILES_SOFT, NOFILES_HARD = resource.getrlimit(resource.RLIMIT_NOFILE)

except AttributeError:

    USE_KQUEUE = False

RUN_RELOADER = True

_mtimes = {}

    # If we are here the code must have changed.

    return True

def kqueue_code_changed():

    """

    Checks for changed code using kqueue. After being called

    it blocks until a change event has been fired.

    """

    # Maximum number of open file descriptors is typically too low (256).

    filenames = list(gen_filenames())

    resource.setrlimit(resource.RLIMIT_NOFILE,

                       (NOFILES_SOFT + len(filenames), NOFILES_HARD))

    kqueue = select.kqueue()

    fds = [open(filename) for filename in filenames]

    _filter = select.KQ_FILTER_VNODE

    flags = select.KQ_EV_ADD

    fflags = select.KQ_NOTE_DELETE | select.KQ_NOTE_WRITE | select.KQ_NOTE_RENAME

    kevents = [select.kevent(fd, _filter, flags, fflags) for fd in fds]

    kqueue.control(kevents, 1)

    for fd in fds:

        fd.close()

    kqueue.close()

    return True

def code_changed():

    global _mtimes, _win

    for filename in gen_filenames():

    ensure_echo_on()

    if USE_INOTIFY:

        fn = inotify_code_changed

    elif USE_KQUEUE:

        fn = kqueue_code_changed

    else:

        fn = code_changed

    while RUN_RELOADER: