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28 lines
667 B
Python
28 lines
667 B
Python
import contextlib
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import os
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import sys
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if sys.platform.startswith("win"):
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import msvcrt
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else:
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import fcntl
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@contextlib.contextmanager
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def acquire_lock(filename):
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if not sys.platform.startswith("win"):
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with open(filename, "a+") as f:
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fcntl.flock(f, fcntl.LOCK_EX)
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yield f
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fcntl.flock(f, fcntl.LOCK_UN)
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else: # Windows
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with open(filename, "w") as f:
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msvcrt.locking(f.fileno(), msvcrt.LK_LOCK, 1)
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yield f
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msvcrt.locking(f.fileno(), msvcrt.LK_UNLCK, 1)
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try:
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os.remove(filename)
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except OSError:
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pass # best effort to remove the lock file
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