File-based locks for Python for Linux and Windows
Locket implements a lock that can be used by multiple processes provided they use the same path.
import locket # Wait for lock with locket.lock_file("path/to/lock/file"): perform_action() # Raise error if lock cannot be acquired immediately with locket.lock_file("path/to/lock/file", timeout=0): perform_action() # Raise error 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.
- Behaviour of locks after fork is undefined.
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