| # SPDX-License-Identifier: Apache-2.0 |
| # Copyright 2012-2021 The Meson development team |
| # Copyright © 2021-2023 Intel Corporation |
| |
| from __future__ import annotations |
| |
| """Posix specific implementations of mesonlib functionality.""" |
| |
| import fcntl |
| import typing as T |
| |
| from .core import MesonException |
| from .platform import BuildDirLock as BuildDirLockBase |
| |
| __all__ = ['BuildDirLock'] |
| |
| class BuildDirLock(BuildDirLockBase): |
| |
| def __enter__(self) -> None: |
| self.lockfile = open(self.lockfilename, 'w', encoding='utf-8') |
| try: |
| fcntl.flock(self.lockfile, fcntl.LOCK_EX | fcntl.LOCK_NB) |
| except (BlockingIOError, PermissionError): |
| self.lockfile.close() |
| raise MesonException('Some other Meson process is already using this build directory. Exiting.') |
| except OSError as e: |
| self.lockfile.close() |
| raise MesonException(f'Failed to lock the build directory: {e.strerror}') |
| |
| def __exit__(self, *args: T.Any) -> None: |
| fcntl.flock(self.lockfile, fcntl.LOCK_UN) |
| self.lockfile.close() |
