Python select.epoll方法代码示例

# 需要导入模块: import select [as 别名]
# 或者: from select import epoll [as 别名]
def _can_allocate(struct):
    """Checks that select structs can be allocated by the underlying operating system.

    Otherwise it could be just advertised by the select module. We don't check select() because we'll be hopeful
    that most platforms that don't have it available will not advertise it. (ie: GAE).
    """
    try:
        # select.poll() objects won't fail until used.
        if struct == 'poll':
            p = select.poll()
            p.poll(0)

        # All others will fail on allocation.
        else:
            getattr(select, struct)().close()
        return True
    except (OSError, AttributeError):
        return False


# Choose the best implementation, roughly:
# kqueue == epoll > poll > select. Devpoll not supported. (See above)
# select() also can't accept a FD > FD_SETSIZE (usually around 1024) 

# 需要导入模块: import select [as 别名]
# 或者: from select import epoll [as 别名]
def DefaultSelector():
    """This function serves as a first call for DefaultSelector to detect.

    It is for when the select module is being monkey-patched incorrectly by eventlet, greenlet,
    and preserve proper behavior.
    """
    global _DEFAULT_SELECTOR
    if _DEFAULT_SELECTOR is None:
        if _can_allocate('kqueue'):
            _DEFAULT_SELECTOR = KqueueSelector
        elif _can_allocate('epoll'):
            _DEFAULT_SELECTOR = EpollSelector
        elif _can_allocate('poll'):
            _DEFAULT_SELECTOR = PollSelector
        elif hasattr(select, 'select'):
            _DEFAULT_SELECTOR = SelectSelector
        else:  # Platform-specific: AppEngine
            raise ValueError('Platform does not have a selector')
    return _DEFAULT_SELECTOR() 

# 需要导入模块: import select [as 别名]
# 或者: from select import epoll [as 别名]
def _can_allocate(struct):
    """ Checks that select structs can be allocated by the underlying
    operating system, not just advertised by the select module. We don't
    check select() because we'll be hopeful that most platforms that
    don't have it available will not advertise it. (ie: GAE) """
    try:
        # select.poll() objects won't fail until used.
        if struct == 'poll':
            p = select.poll()
            p.poll(0)

        # All others will fail on allocation.
        else:
            getattr(select, struct)().close()
        return True
    except (OSError, AttributeError) as e:
        return False


# Choose the best implementation, roughly:
# kqueue == epoll > poll > select. Devpoll not supported. (See above)
# select() also can't accept a FD > FD_SETSIZE (usually around 1024) 

# 需要导入模块: import select [as 别名]
# 或者: from select import epoll [as 别名]
def DefaultSelector():
    """ This function serves as a first call for DefaultSelector to
    detect if the select module is being monkey-patched incorrectly
    by eventlet, greenlet, and preserve proper behavior. """
    global _DEFAULT_SELECTOR
    if _DEFAULT_SELECTOR is None:
        if _can_allocate('kqueue'):
            _DEFAULT_SELECTOR = KqueueSelector
        elif _can_allocate('epoll'):
            _DEFAULT_SELECTOR = EpollSelector
        elif _can_allocate('poll'):
            _DEFAULT_SELECTOR = PollSelector
        elif hasattr(select, 'select'):
            _DEFAULT_SELECTOR = SelectSelector
        else:  # Platform-specific: AppEngine
            raise ValueError('Platform does not have a selector')
    return _DEFAULT_SELECTOR() 

# 需要导入模块: import select [as 别名]
# 或者: from select import epoll [as 别名]
def __init__(self):
        if hasattr(select, 'epoll'):
            self._impl = select.epoll()
            model = 'epoll'
        elif hasattr(select, 'kqueue'):
            self._impl = KqueueLoop()
            model = 'kqueue'
        elif hasattr(select, 'select'):
            self._impl = SelectLoop()
            model = 'select'
        else:
            raise Exception('can not find any available functions in select '
                            'package')
        self._fdmap = {}  # (f, handler)
        self._last_time = time.time()
        self._periodic_callbacks = []
        self._stopping = False
        logging.debug('using event model: %s', model) 

# 需要导入模块: import select [as 别名]
# 或者: from select import epoll [as 别名]
def test_fromfd(self):
        server, client = self._connected_pair()

        ep = select.epoll(2)
        ep2 = select.epoll.fromfd(ep.fileno())

        ep2.register(server.fileno(), select.EPOLLIN | select.EPOLLOUT)
        ep2.register(client.fileno(), select.EPOLLIN | select.EPOLLOUT)

        events = ep.poll(1, 4)
        events2 = ep2.poll(0.9, 4)
        self.assertEqual(len(events), 2)
        self.assertEqual(len(events2), 2)

        ep.close()
        try:
            ep2.poll(1, 4)
        except IOError, e:
            self.assertEqual(e.args[0], errno.EBADF, e) 

# 需要导入模块: import select [as 别名]
# 或者: from select import epoll [as 别名]
def poll(self, timeout):
        try:
            r, w, e = select.select(self._r, self._w, [], timeout)
        except select.error as err:
            if err.errno == errno.EINTR:
                return
            raise

        smap_get = self.socket_map.get
        for fd in r:
            obj = smap_get(fd)
            if obj is None or not obj.readable():
                continue
            _read(obj)
        for fd in w:
            obj = smap_get(fd)
            if obj is None or not obj.writable():
                continue
            _write(obj)


# ===================================================================
# --- poll() / epoll()
# =================================================================== 

# 需要导入模块: import select [as 别名]
# 或者: from select import epoll [as 别名]
def initialize(self, **kwargs):
        super(EPollIOLoop, self).initialize(impl=select.epoll(), **kwargs) 

# 需要导入模块: import select [as 别名]
# 或者: from select import epoll [as 别名]
def __init__(self):
            super(EpollSelector, self).__init__()
            self._epoll = select.epoll() 

# 需要导入模块: import select [as 别名]
# 或者: from select import epoll [as 别名]
def select(self, timeout=None):
            if timeout is not None:
                if timeout <= 0:
                    timeout = 0.0
                else:
                    # select.epoll.poll() has a resolution of 1 millisecond
                    # but luckily takes seconds so we don't need a wrapper
                    # like PollSelector. Just for better rounding.
                    timeout = math.ceil(timeout * 1e3) * 1e-3
                timeout = float(timeout)
            else:
                timeout = -1.0  # epoll.poll() must have a float.

            # We always want at least 1 to ensure that select can be called
            # with no file descriptors registered. Otherwise will fail.
            max_events = max(len(self._fd_to_key), 1)

            ready = []
            fd_events = _syscall_wrapper(self._epoll.poll, True,
                                         timeout=timeout,
                                         maxevents=max_events)
            for fd, event_mask in fd_events:
                events = 0
                if event_mask & ~select.EPOLLIN:
                    events |= EVENT_WRITE
                if event_mask & ~select.EPOLLOUT:
                    events |= EVENT_READ

                key = self._key_from_fd(fd)
                if key:
                    ready.append((key, events & key.events))
            return ready