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# 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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"""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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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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