



'''simple docstring'''




import logging
import os
import threading
import time


try:
						import warnings
except ImportError:
						lowerCamelCase				:str							       =   None

try:
						import msvcrt
except ImportError:
						lowerCamelCase				:Dict							       =   None

try:
						import fcntl
except ImportError:
						lowerCamelCase				:Any							       =   None


# Backward compatibility
# ------------------------------------------------
try:
						TimeoutError
except NameError:
						lowerCamelCase				:List[Any]							       =   OSError


# Data
# ------------------------------------------------
lowerCamelCase				:Union[str, Any]							       =   [
    """Timeout""",
    """BaseFileLock""",
    """WindowsFileLock""",
    """UnixFileLock""",
    """SoftFileLock""",
    """FileLock""",
]

lowerCamelCase				:Dict							       =   """3.0.12"""


lowerCamelCase				:Optional[Any]							       =   None



def       a     (					):
			'''simple docstring'''





			global _logger
			A_      :		List[str]      =	_logger or logging.getLogger(__name__       )
			return _logger







class       _lowerCAmelCase				(     _a					):


	def __init__(self			, lowercase				):
				A_      :		Tuple      =	lock_file
				return None


	def __str__(self				):
				A_      :		int      =	F'The file lock \'{self.lock_file}\' could not be acquired.'
				return temp







class       _lowerCAmelCase				:


	def __init__(self			, lowercase				):
				A_      :		Optional[int]      =	lock
				return None


	def __enter__(self				):
				return self.lock


	def __exit__(self			, lowercase			, lowercase			, lowercase				):
				self.lock.release()
				return None







class       _lowerCAmelCase				:


	def __init__(self			, lowercase			, lowercase=-1			, lowercase=None				):
				A_      :		List[str]      =	max_filename_length if max_filename_length is not None else 255
				# Hash the filename if it's too long
				A_      :		Tuple      =	self.hash_filename_if_too_long(__lowerCamelCase			, __lowerCamelCase				)
				# The path to the lock file.
				A_      :		Tuple      =	lock_file

				# The file descriptor for the *_lock_file* as it is returned by the
				# os.open() function.
				# This file lock is only NOT None, if the object currently holds the
				# lock.
				A_      :		Any      =	None

				# The default timeout value.
				A_      :		List[Any]      =	timeout

				# We use this lock primarily for the lock counter.
				A_      :		Dict      =	threading.Lock()

				# The lock counter is used for implementing the nested locking
				# mechanism. Whenever the lock is acquired, the counter is increased and
				# the lock is only released, when this value is 0 again.
				A_      :		List[Any]      =	0
				return None


	@property
	def        _a      (self				):
				return self._lock_file


	@property
	def        _a      (self				):
				return self._timeout


	@timeout.setter
	def        _a      (self			, lowercase				):
				A_      :		int      =	float(__lowerCamelCase				)
				return None


	def        _a      (self				):
				raise NotImplementedError()


	def        _a      (self				):
				raise NotImplementedError()


	@property
	def        _a      (self				):
				return self._lock_file_fd is not None


	def        _a      (self			, lowercase=None			, lowercase=0.05				):
				# Use the default timeout, if no timeout is provided.
				if timeout is None:
							A_      :		str      =	self.timeout

				# Increment the number right at the beginning.
				# We can still undo it, if something fails.
				with self._thread_lock:
							self._lock_counter += 1

				A_      :		str      =	id(self				)
				A_      :		Union[str, Any]      =	self._lock_file
				A_      :		Optional[Any]      =	time.time()
				try:
							while True:
										with self._thread_lock:
													if not self.is_locked:
																logger().debug(F'Attempting to acquire lock {lock_id} on {lock_filename}'				)
																self._acquire()

										if self.is_locked:
													logger().debug(F'Lock {lock_id} acquired on {lock_filename}'				)
													break
										elif timeout >= 0 and time.time() - start_time > timeout:
													logger().debug(F'Timeout on acquiring lock {lock_id} on {lock_filename}'				)
													raise Timeout(self._lock_file				)
										else:
													logger().debug(
													    F'Lock {lock_id} not acquired on {lock_filename}, waiting {poll_intervall} seconds ...'				)
													time.sleep(__lowerCamelCase				)
				except:  # noqa
							# Something did go wrong, so decrement the counter.
							with self._thread_lock:
										A_      :		str      =	max(0			, self._lock_counter - 1				)

							raise
				return _Acquire_ReturnProxy(lock=self				)


	def        _a      (self			, lowercase=False				):
				with self._thread_lock:
							if self.is_locked:
										self._lock_counter -= 1

										if self._lock_counter == 0 or force:
													A_      :		Tuple      =	id(self				)
													A_      :		List[Any]      =	self._lock_file

													logger().debug(F'Attempting to release lock {lock_id} on {lock_filename}'				)
													self._release()
													A_      :		Dict      =	0
													logger().debug(F'Lock {lock_id} released on {lock_filename}'				)

				return None


	def __enter__(self				):
				self.acquire()
				return self


	def __exit__(self			, lowercase			, lowercase			, lowercase				):
				self.release()
				return None


	def __del__(self				):
				self.release(force=__lowerCamelCase				)
				return None


	def        _a      (self			, lowercase			, lowercase				):
				A_      :		List[str]      =	os.path.basename(__lowerCamelCase				)
				if len(__lowerCamelCase				) > max_length and max_length > 0:
							A_      :		Union[str, Any]      =	os.path.dirname(__lowerCamelCase				)
							A_      :		Tuple      =	str(hash(__lowerCamelCase				)				)
							A_      :		List[str]      =	filename[: max_length - len(__lowerCamelCase				) - 8] + """...""" + hashed_filename + """.lock"""
							return os.path.join(__lowerCamelCase			, __lowerCamelCase				)
				else:
							return path







class       _lowerCAmelCase				(     _a					):


	def __init__(self			, lowercase			, lowercase=-1			, lowercase=None				):
				from .file_utils import relative_to_absolute_path

				super().__init__(__lowerCamelCase			, timeout=__lowerCamelCase			, max_filename_length=__lowerCamelCase				)
				A_      :		Union[str, Any]      =	"""\\\\?\\""" + relative_to_absolute_path(self.lock_file				)


	def        _a      (self				):
				A_      :		str      =	os.O_RDWR | os.O_CREAT | os.O_TRUNC

				try:
							A_      :		str      =	os.open(self._lock_file			, __lowerCamelCase				)
				except OSError:
							pass
				else:
							try:
										msvcrt.locking(__lowerCamelCase			, msvcrt.LK_NBLCK			, 1				)
							except OSError:
										os.close(__lowerCamelCase				)
							else:
										A_      :		Tuple      =	fd
				return None


	def        _a      (self				):
				A_      :		Dict      =	self._lock_file_fd
				A_      :		Tuple      =	None
				msvcrt.locking(__lowerCamelCase			, msvcrt.LK_UNLCK			, 1				)
				os.close(__lowerCamelCase				)

				try:
							os.remove(self._lock_file				)
				# Probably another instance of the application
				# that acquired the file lock.
				except OSError:
							pass
				return None







class       _lowerCAmelCase				(     _a					):


	def __init__(self			, lowercase			, lowercase=-1			, lowercase=None				):
				A_      :		Union[str, Any]      =	os.statvfs(os.path.dirname(__lowerCamelCase				)				).f_namemax
				super().__init__(__lowerCamelCase			, timeout=__lowerCamelCase			, max_filename_length=__lowerCamelCase				)


	def        _a      (self				):
				A_      :		Union[str, Any]      =	os.O_RDWR | os.O_CREAT | os.O_TRUNC
				A_      :		Optional[Any]      =	os.open(self._lock_file			, __lowerCamelCase				)

				try:
							fcntl.flock(__lowerCamelCase			, fcntl.LOCK_EX | fcntl.LOCK_NB				)
				except OSError:
							os.close(__lowerCamelCase				)
				else:
							A_      :		List[str]      =	fd
				return None


	def        _a      (self				):
				A_      :		str      =	self._lock_file_fd
				A_      :		Tuple      =	None
				fcntl.flock(__lowerCamelCase			, fcntl.LOCK_UN				)
				os.close(__lowerCamelCase				)
				return None







class       _lowerCAmelCase				(     _a					):


	def        _a      (self				):
				A_      :		List[Any]      =	os.O_WRONLY | os.O_CREAT | os.O_EXCL | os.O_TRUNC
				try:
							A_      :		str      =	os.open(self._lock_file			, __lowerCamelCase				)
				except OSError:
							pass
				else:
							A_      :		Union[str, Any]      =	fd
				return None


	def        _a      (self				):
				os.close(self._lock_file_fd				)
				A_      :		Tuple      =	None

				try:
							os.remove(self._lock_file				)
				# The file is already deleted and that's what we want.
				except OSError:
							pass
				return None






lowerCamelCase				:Dict							       =   None

if msvcrt:
						lowerCamelCase				:List[Any]							       =   WindowsFileLock
elif fcntl:
						lowerCamelCase				:Dict							       =   UnixFileLock
else:
						lowerCamelCase				:Dict							       =   SoftFileLock

						if warnings is not None:
												warnings.warn('''only soft file lock is available''')





from __future__ import annotations
def 		a_							( __lowerCAmelCase				):
  if not nums:
    return 0
  lowerCAmelCase__										=      nums[0]
  lowerCAmelCase__										=      0
  for num in nums[1:]:
    lowerCAmelCase__				,      lowerCAmelCase__										=      (
        max_excluding + num,
        max(__lowerCAmelCase   , __lowerCAmelCase				),
    )
  return max(__lowerCAmelCase   , __lowerCAmelCase				)


if __name__ == "__main__":
      import doctest

      doctest.testmod()

