mirror of
https://github.com/SickGear/SickGear.git
synced 2024-11-25 22:35:05 +00:00
63 lines
1.8 KiB
Python
63 lines
1.8 KiB
Python
from __future__ import annotations
|
|
|
|
import os
|
|
import sys
|
|
from errno import ENOENT
|
|
from typing import cast
|
|
|
|
from ._api import BaseFileLock
|
|
from ._util import raise_on_exist_ro_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_exist_ro_file(self._lock_file)
|
|
mode = (
|
|
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, mode)
|
|
except OSError as exception:
|
|
if exception.errno == ENOENT: # No such file or directory
|
|
raise
|
|
else:
|
|
try:
|
|
msvcrt.locking(fd, msvcrt.LK_NBLCK, 1)
|
|
except OSError:
|
|
os.close(fd)
|
|
else:
|
|
self._lock_file_fd = fd
|
|
|
|
def _release(self) -> None:
|
|
fd = cast(int, self._lock_file_fd)
|
|
self._lock_file_fd = None
|
|
msvcrt.locking(fd, msvcrt.LK_UNLCK, 1)
|
|
os.close(fd)
|
|
|
|
try:
|
|
os.remove(self._lock_file)
|
|
# Probably another instance of the application hat acquired the file lock.
|
|
except OSError:
|
|
pass
|
|
|
|
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",
|
|
]
|