A platform independent file lock.

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Project description

This package contains a single module, which implements a platform independent file locking mechanism for Python.

The lock includes a lock counter and is thread safe. This means, that when you lock the same lock object (in the same application) twice, you will get no timeout error.

Examples

import filelock

lock = filelock.FileLock("my_lock_file")

# This is the easiest way to use the file lock. Note, that the FileLock
# object blocks until the lock can be acquired.
with lock:
        print("Doing awesome stuff")

# If you don't want to wait an undefined time for the file lock, you can use
# the *acquire* method to provide a *timeout* paramter:
try:
        with lock.acquire(timeout=10):
                print("Doing more awesome stuff!")
except filelock.Timeout as err:
        print("Could not acquire the file lock. Leaving here!")
        exit(1)

# When you're using Python 3.3+, *filelock.Timeout* is a subclass of
# *TimeoutError* else OSError. So you can do this too:
try:
        with lock.acquire(timeout=10):
                print("Doing more awesome stuff!")
except TimeoutError as err:
        print("Could not acquire the file lock. Leaving here!")
        exit(1)

# If you don't want to use or if you can't use the *with-statement*, the
# example above is equal to this one:
try:
        lock.acquire(timeout=10)
except filelock.Timeout as err:
        print("Could not acquire the file lock. Leaving here!")
        exit(1)
else:
        print("Doing more awesome stuff!")
finally:
        lock.release()

# You can even nest the lock or acquiring it multiple times in the same
# application.
with lock:
        assert lock.is_locked()
        with lock:
                assert lock.is_locked()
        assert lock.is_locked()
assert (not lock.is_locked())

License

This package is public domain.

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