The Meson Build System
http://mesonbuild.com/
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43 lines
1.6 KiB
43 lines
1.6 KiB
# SPDX-license-identifier: Apache-2.0 |
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# Copyright 2012-2021 The Meson development team |
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# Copyright © 2021 Intel Corporation |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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from __future__ import annotations |
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"""Posix specific implementations of mesonlib functionality.""" |
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import fcntl |
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import typing as T |
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from .universal import MesonException |
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from .platform import BuildDirLock as BuildDirLockBase |
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__all__ = ['BuildDirLock'] |
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class BuildDirLock(BuildDirLockBase): |
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def __enter__(self) -> None: |
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self.lockfile = open(self.lockfilename, 'w', encoding='utf-8') |
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try: |
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fcntl.flock(self.lockfile, fcntl.LOCK_EX | fcntl.LOCK_NB) |
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except (BlockingIOError, PermissionError): |
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self.lockfile.close() |
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raise MesonException('Some other Meson process is already using this build directory. Exiting.') |
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except OSError as e: |
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self.lockfile.close() |
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raise MesonException(f'Failed to lock the build directory: {e.strerror}') |
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def __exit__(self, *args: T.Any) -> None: |
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fcntl.flock(self.lockfile, fcntl.LOCK_UN) |
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self.lockfile.close()
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