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# SPDX-License-Identifier: Apache-2.0
# Copyright 2012-2021 The Meson development team
# Copyright © 2021-2023 Intel Corporation
from __future__ import annotations
"""Windows specific implementations of mesonlib functionality."""
import msvcrt
import typing as T
from .core import MesonException
from .platform import DirectoryLockBase, DirectoryLockAction
__all__ = ['DirectoryLock', 'DirectoryLockAction']
class DirectoryLock(DirectoryLockBase):
def __enter__(self) -> None:
self.lockfile = open(self.lockpath, 'w+', encoding='utf-8')
try:
mode = msvcrt.LK_LOCK
if self.action != DirectoryLockAction.WAIT:
mode = msvcrt.LK_NBLCK
msvcrt.locking(self.lockfile.fileno(), mode, 1)
except BlockingIOError:
self.lockfile.close()
if self.action == DirectoryLockAction.IGNORE:
return
raise MesonException(self.err)
except PermissionError:
self.lockfile.close()
raise MesonException(self.err)
def __exit__(self, *args: T.Any) -> None:
if self.lockfile is None or self.lockfile.closed:
return
msvcrt.locking(self.lockfile.fileno(), msvcrt.LK_UNLCK, 1)
self.lockfile.close()
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