16 lines
642 B
Python
16 lines
642 B
Python
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import fcntl
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from collections.abc import Generator
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from contextlib import contextmanager
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from pathlib import Path
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@contextmanager
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def locked_open(filename: str | Path, mode: str = "r") -> Generator:
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"""
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This is a context manager that provides an advisory write lock on the file specified by `filename` when entering the context, and releases the lock when leaving the context. The lock is acquired using the `fcntl` module's `LOCK_EX` flag, which applies an exclusive write lock to the file.
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"""
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with open(filename, mode) as fd:
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fcntl.flock(fd, fcntl.LOCK_EX)
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yield fd
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fcntl.flock(fd, fcntl.LOCK_UN)
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