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Create a new lock object.
:param lock_file: path to the file
:param timeout: default timeout when acquiring the lock, in seconds. It will be used as fallback value in the acquire method, if no timeout value (``None``) is given. If you want to disable the timeout, set it to a negative value. A timeout of 0 means that there is exactly one attempt to acquire the file lock.
:param mode: file permissions for the lockfile
:param thread_local: Whether this object's internal context should be thread local or not. If this is set to ``False`` then the lock will be reentrant across threads.
:param blocking: whether the lock should be blocking or not
:param is_singleton: If this is set to ``True`` then only one instance of this class will be created per lock file. This is useful if you want to use the lock object for reentrant locking without needing to pass the same object around.
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:return: the default timeout value, in seconds
.. versionadded:: 2.0.0
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:return: A boolean indicating if the lock file is holding the lock currently.
.. versionchanged:: 2.0.0
This was previously a method and is now a property.
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Try to acquire the file lock.
:param timeout: maximum wait time for acquiring the lock, ``None`` means use the default :attr:`~timeout` is and
if ``timeout < 0``, there is no timeout and this method will block until the lock could be acquired
:param poll_interval: interval of trying to acquire the lock file
:param poll_intervall: deprecated, kept for backwards compatibility, use ``poll_interval`` instead
:param blocking: defaults to True. If False, function will return immediately if it cannot obtain a lock on the
first attempt. Otherwise, this method will block until the timeout expires or the lock is acquired.
:raises Timeout: if fails to acquire lock within the timeout period
:return: a context object that will unlock the file when the context is exited
.. code-block:: python
# You can use this method in the context manager (recommended)
with lock.acquire():
pass
# Or use an equivalent try-finally construct:
lock.acquire()
try:
pass
finally:
lock.release()
.. versionchanged:: 2.0.0
This method returns now a *proxy* object instead of *self*,
so that it can be used in a with statement without side effects.
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Releases the file lock. Please note, that the lock is only completely released, if the lock counter is 0.
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Acquire the lock.
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