1 files changed, 43 insertions, 0 deletions
diff --git a/mesonbuild/utils/posix.py b/mesonbuild/utils/posix.py
new file mode 100644
index 0000000..51c3cd0
--- /dev/null
+++ b/mesonbuild/utils/posix.py
@@ -0,0 +1,43 @@
+# 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.
+from __future__ import annotations
+
+"""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.')
+        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()