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# SPDX-license-identifier: Apache-2.0
# Copyright 2012-2021 The Meson development team
# Copyright © 2021 Intel Corporation
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Posix specific implementations of mesonlib functionality."""
import fcntl
import typing as T
from .universal 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.')
def __exit__(self, *args: T.Any) -> None:
fcntl.flock(self.lockfile, fcntl.LOCK_UN)
self.lockfile.close()
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