A python package that provides useful locks
Cross-platform locks for threads and processes.
pip install fasteners
Lock for processes has the same API as the threading.Lock for threads:
import fasteners import threading lock = threading.Lock() # for threads lock = fasteners.InterProcessLock('path/to/lock.file') # for processes with lock: ... # exclusive access # or alternatively lock.acquire() ... # exclusive access lock.release()
Reader Writer lock has a similar API, which is the same for threads or processes:
import fasteners rw_lock = fasteners.ReaderWriterLock() # for threads rw_lock = fasteners.InterProcessReaderWriterLock('path/to/lock.file') # for processes with rw_lock.write_lock(): ... # write access with rw_lock.read_lock(): ... # read access # or alternatively rw_lock.acquire_read_lock() ... # read access rw_lock.release_read_lock() rw_lock.acquire_write_lock() ... # write access rw_lock.release_write_lock()
Python standard library provides a lock for threads (both a reentrant one, and a non-reentrant one, see below). Fasteners extends this, and provides a lock for processes, as well as Reader Writer locks for both threads and processes. Definitions of terms used in this overview can be found in the glossary.
The specifics of the locks are as follows:
fasteners.InterProcessLock uses fcntl on Unix-like systems and
msvc _locking on Windows.
As a result, if used cross-platform it guarantees an intersection of their features:
fasteners.InterProcessReaderWriterLock also uses fcntl on Unix-like systems and
LockFileEx on Windows. Their
features are as follows:
Fasteners does not provide a simple thread lock, but for the sake of comparison note that the
provides both a reentrant and non-reentrant locks:
fasteners.ReaderWriterLock at the moment is as follows:
If your threads are created by some other means than the standard library
module (for example
eventlet), you may need to provide the corresponding thread
identification and synchronisation functions to the
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