Python select.html方法代码示例

# 需要导入模块: import select [as 别名]
# 或者: from select import html [as 别名]
def __init__(self, _kqueueImpl=select):
        """
        Initialize kqueue object, file descriptor tracking dictionaries, and
        the base class.

        See:
            - http://docs.python.org/library/select.html
            - www.freebsd.org/cgi/man.cgi?query=kqueue
            - people.freebsd.org/~jlemon/papers/kqueue.pdf

        @param _kqueueImpl: The implementation of L{_IKQueue} to use. A
            hook for testing.
        """
        self._impl = _kqueueImpl
        self._kq = self._impl.kqueue()
        self._reads = set()
        self._writes = set()
        self._selectables = {}
        posixbase.PosixReactorBase.__init__(self) 

# 需要导入模块: import select [as 别名]
# 或者: from select import html [as 别名]
def __init__(self, watch_manager, default_proc_fun=None, read_freq=0,
                 threshold=0, timeout=None):
        """
        Initialization, initialize base classes. read_freq, threshold and
        timeout parameters are used when looping.

        @param watch_manager: Watch Manager.
        @type watch_manager: WatchManager instance
        @param default_proc_fun: Default processing method. See base class.
        @type default_proc_fun: instance of ProcessEvent
        @param read_freq: if read_freq == 0, events are read asap,
                          if read_freq is > 0, this thread sleeps
                          max(0, read_freq - (timeout / 1000)) seconds.
        @type read_freq: int
        @param threshold: File descriptor will be read only if the accumulated
                          size to read becomes >= threshold. If != 0, you likely
                          want to use it in combination with an appropriate
                          value set for read_freq because without that you would
                          keep looping without really reading anything and that
                          until the amount of events to read is >= threshold. At
                          least with read_freq you might sleep.
        @type threshold: int
        @param timeout: see read_freq above. If provided, it must be set in
                        milliseconds. See
                        https://docs.python.org/2/library/select.html#select.poll.poll
        @type timeout: int
        """
        # Init threading base class
        threading.Thread.__init__(self)
        # Stop condition
        self._stop_event = threading.Event()
        # Init Notifier base class
        Notifier.__init__(self, watch_manager, default_proc_fun, read_freq,
                          threshold, timeout)
        # Create a new pipe used for thread termination
        self._pipe = os.pipe()
        self._pollobj.register(self._pipe[0], select.POLLIN) 

# 需要导入模块: import select [as 别名]
# 或者: from select import html [as 别名]
def tail_file(file_path, from_head=False):
        """
        创建子进程tail file
        Args:
            file_path: 文件路径
            from_head: 是否重头开始读取文件

        Returns:

        """
        # 安全注释, 防止OP不小心kill子进程
        safe_comment = "'(Do not kill me, parent PID: %d)'" % os.getpid()
        if from_head is True:
            # 先输出现有文件全部内容, 然后tail文件
            # -F 当文件变化时能切换到新的文件
            cmd = "cat %s && tail -F %s %s" % (file_path, file_path, safe_comment)
        else:
            cmd = "tail -F %s %s" % (file_path, safe_comment)

        try:
            process = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True, bufsize=-1)
        except OSError as e:
            return False, str(e)
        else:
            # https://docs.python.org/2/library/select.html
            poll = select.epoll()
            poll.register(process.stdout)

            return process, poll 

# 需要导入模块: import select [as 别名]
# 或者: from select import html [as 别名]
def __init__(self, watch_manager, default_proc_fun=None, read_freq=0,
                 threshold=0, timeout=None):
        """
        Initialization, initialize base classes. read_freq, threshold and
        timeout parameters are used when looping.

        @param watch_manager: Watch Manager.
        @type watch_manager: WatchManager instance
        @param default_proc_fun: Default processing method. See base class.
        @type default_proc_fun: instance of ProcessEvent
        @param read_freq: if read_freq == 0, events are read asap,
                          if read_freq is > 0, this thread sleeps
                          max(0, read_freq - (timeout / 1000)) seconds.
        @type read_freq: int
        @param threshold: File descriptor will be read only if the accumulated
                          size to read becomes >= threshold. If != 0, you likely
                          want to use it in combination with an appropriate
                          value set for read_freq because without that you would
                          keep looping without really reading anything and that
                          until the amount of events to read is >= threshold. At
                          least with read_freq you might sleep.
        @type threshold: int
        @param timeout: see read_freq above. If provided, it must be set in
                        milliseconds. See
                        https://docs.python.org/3/library/select.html#select.poll.poll
        @type timeout: int
        """
        # Init threading base class
        threading.Thread.__init__(self)
        # Stop condition
        self._stop_event = threading.Event()
        # Init Notifier base class
        Notifier.__init__(self, watch_manager, default_proc_fun, read_freq,
                          threshold, timeout)
        # Create a new pipe used for thread termination
        self._pipe = os.pipe()
        self._pollobj.register(self._pipe[0], select.POLLIN)