| # 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() |
