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diff --git a/meson/mesonbuild/mesonlib/posix.py b/meson/mesonbuild/mesonlib/posix.py
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+++ b/meson/mesonbuild/mesonlib/posix.py
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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()