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Server : LiteSpeed System : Linux srv104790275 5.15.0-161-generic #171-Ubuntu SMP Sat Oct 11 08:17:01 UTC 2025 x86_64 User : dewac4139 ( 1077) PHP Version : 8.0.30 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, Directory : /usr/lib/python3/dist-packages/filelock/ |
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from __future__ import annotations
import os
import sys
from typing import cast
from ._api import BaseFileLock
#: a flag to indicate if the fcntl API is available
has_fcntl = False
if sys.platform == "win32": # pragma: win32 cover
class UnixFileLock(BaseFileLock):
"""Uses the :func:`fcntl.flock` to hard lock the lock file on unix systems."""
def _acquire(self) -> None:
raise NotImplementedError
def _release(self) -> None:
raise NotImplementedError
else: # pragma: win32 no cover
try:
import fcntl
except ImportError:
pass
else:
has_fcntl = True
class UnixFileLock(BaseFileLock):
"""Uses the :func:`fcntl.flock` to hard lock the lock file on unix systems."""
def _acquire(self) -> None:
open_mode = os.O_RDWR | os.O_CREAT | os.O_TRUNC
fd = os.open(self._lock_file, open_mode)
try:
fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB)
except OSError:
os.close(fd)
else:
self._lock_file_fd = fd
def _release(self) -> None:
# Do not remove the lockfile:
# https://github.com/tox-dev/py-filelock/issues/31
# https://stackoverflow.com/questions/17708885/flock-removing-locked-file-without-race-condition
fd = cast(int, self._lock_file_fd)
self._lock_file_fd = None
fcntl.flock(fd, fcntl.LOCK_UN)
os.close(fd)
__all__ = [
"has_fcntl",
"UnixFileLock",
]