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_windows.py

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",
]

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-04-04 08:04:08
..	dir	-	root/root	0755	2025-12-03 06:01:31
__pycache__	dir	-	root/root	0755	2025-04-04 08:04:08
__init__.py	text/plain	1.73 KB	root/root	0644	2025-04-04 08:04:08
_api.py	text/x-script.python	14.2 KB	root/root	0644	2025-04-04 08:04:08
_error.py	text/x-script.python	787 B	root/root	0644	2025-04-04 08:04:08
_soft.py	text/x-script.python	1.67 KB	root/root	0644	2025-04-04 08:04:08
_unix.py	text/x-script.python	2.3 KB	root/root	0644	2025-04-04 08:04:08
_util.py	text/x-script.python	1.67 KB	root/root	0644	2025-04-04 08:04:08
_windows.py	text/x-script.python	2.13 KB	root/root	0644	2025-04-04 08:04:08
asyncio.py	text/plain	12.16 KB	root/root	0644	2025-04-04 08:04:08
py.typed	application/x-empty	0 B	root/root	0644	2025-04-04 08:04:08
version.py	text/plain	513 B	root/root	0644	2025-04-04 08:04:08

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