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Readme
Locket implements a file-based lock that can be used by multiple processes provided they use the same path.
.. code-block:: python
import locket
# Wait for lock
with locket.lock_file("path/to/lock/file"):
perform_action()
# Raise LockError if lock cannot be acquired immediately
with locket.lock_file("path/to/lock/file", timeout=0):
perform_action()
# Raise LockError if lock cannot be acquired after thirty seconds
with locket.lock_file("path/to/lock/file", timeout=30):
perform_action()
# Without context managers:
lock = locket.lock_file("path/to/lock/file")
try:
lock.acquire()
perform_action()
finally:
lock.release()
Locks largely behave as (non-reentrant) Lock
instances from the threading
module in the standard library. Specifically, their behaviour is:
Locks are uniquely identified by the file being locked, both in the same process and across different processes.
Locks are either in a locked or unlocked state.
When the lock is unlocked, calling acquire()
returns immediately and changes
the lock state to locked.
When the lock is locked, calling acquire()
will block until the lock state
changes to unlocked, or until the timeout expires.
If a process holds a lock, any thread in that process can call release()
to
change the state to unlocked.
Calling release()
on an unlocked lock raises LockError
.
Behaviour of locks after fork
is undefined.
.. code-block:: sh
pip install locket
FAQs
File-based locks for Python on Linux and Windows
We found that locket demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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