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Edit File : _windows.py \| Size : 2.13 KB
from __future__ import annotations import os import sys from contextlib import suppress from errno import EACCES from pathlib import Path from typing import cast from ._api import BaseFileLock from ._util import ensure_directory_exists, raise_on_not_writable_file if sys.platform == "win32": # pragma: win32 cover import msvcrt class WindowsFileLock(BaseFileLock): """Uses the :func:`msvcrt.locking` function to hard lock the lock file on Windows systems.""" def _acquire(self) -> None: raise_on_not_writable_file(self.lock_file) ensure_directory_exists(self.lock_file) flags = ( os.O_RDWR # open for read and write \| os.O_CREAT # create file if not exists \| os.O_TRUNC # truncate file if not empty ) try: fd = os.open(self.lock_file, flags, self._context.mode) except OSError as exception: if exception.errno != EACCES: # has no access to this lock raise else: try: msvcrt.locking(fd, msvcrt.LK_NBLCK, 1) except OSError as exception: os.close(fd) # close file first if exception.errno != EACCES: # file is already locked raise else: self._context.lock_file_fd = fd def _release(self) -> None: fd = cast("int", self._context.lock_file_fd) self._context.lock_file_fd = None msvcrt.locking(fd, msvcrt.LK_UNLCK, 1) os.close(fd) with suppress(OSError): # Probably another instance of the application hat acquired the file lock. Path(self.lock_file).unlink() else: # pragma: win32 no cover class WindowsFileLock(BaseFileLock): """Uses the :func:`msvcrt.locking` function to hard lock the lock file on Windows systems.""" def _acquire(self) -> None: raise NotImplementedError def _release(self) -> None: raise NotImplementedError __all__ = [ "WindowsFileLock", ] Back

Edit File : _windows.py | Size : 2.13 KB

from __future__ import annotations

import os
import sys
from contextlib import suppress
from errno import EACCES
from pathlib import Path
from typing import cast

from ._api import BaseFileLock
from ._util import ensure_directory_exists, raise_on_not_writable_file

if sys.platform == "win32":  # pragma: win32 cover
    import msvcrt

class WindowsFileLock(BaseFileLock):
        """Uses the :func:`msvcrt.locking` function to hard lock the lock file on Windows systems."""

def _acquire(self) -> None:
            raise_on_not_writable_file(self.lock_file)
            ensure_directory_exists(self.lock_file)
            flags = (
                os.O_RDWR  # open for read and write
                | os.O_CREAT  # create file if not exists
                | os.O_TRUNC  # truncate file if not empty
            )
            try:
                fd = os.open(self.lock_file, flags, self._context.mode)
            except OSError as exception:
                if exception.errno != EACCES:  # has no access to this lock
                    raise
            else:
                try:
                    msvcrt.locking(fd, msvcrt.LK_NBLCK, 1)
                except OSError as exception:
                    os.close(fd)  # close file first
                    if exception.errno != EACCES:  # file is already locked
                        raise
                else:
                    self._context.lock_file_fd = fd

def _release(self) -> None:
            fd = cast("int", self._context.lock_file_fd)
            self._context.lock_file_fd = None
            msvcrt.locking(fd, msvcrt.LK_UNLCK, 1)
            os.close(fd)

with suppress(OSError):  # Probably another instance of the application hat acquired the file lock.
                Path(self.lock_file).unlink()

else:  # pragma: win32 no cover

class WindowsFileLock(BaseFileLock):
        """Uses the :func:`msvcrt.locking` function to hard lock the lock file on Windows systems."""

def _acquire(self) -> None:
            raise NotImplementedError

def _release(self) -> None:
            raise NotImplementedError

__all__ = [
    "WindowsFileLock",
]

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