Latest recipes tagged "threadsafe"

safetkinter.py (Python)

2012-06-05T03:23:47-07:00

Python recipe 578153 by Stephen Chappell (threadsafe, tkinter).

This module clones several classes from the tkinter library for use with threads. Instances from these new classes should run on whatever thread the root was created on. Child classes inherit the parent's safety.

affinity.py (Python)

2012-06-05T03:12:55-07:00

Python recipe 578151 by Stephen Chappell (cpu_usage, threadsafe).

Allow a simple way to ensure execution is confined to one thread.

This module defines the Affinity data type that runs code on a single thread. An instance of the class will execute functions only on the thread that made the object in the first place. The class is useful in a GUI's main loop.

Multiprocess-safe logging file-handler + interprocess RLock (Python)

2010-09-22T17:30:10-07:00

Python recipe 577395 by Jan Kaliszewski (concurrency, file, file_lock, flock, handler, logging, process, rlock, threading, threadsafe). Revision 11.

A Python 2.x/3.x-compatibile multiprocess-safe logging file-handler (logging.FileHandler replacement, designed for logging to a single file from multiple independent processes) together with a simple interprocess recursive lock -- universal abstract classes + Unix/Linux implementation.

Update: It's is a deeply revised version. Especially, now it --

is Python 2.4, 2.5, 2.6, 3.1 -compatibile (previously Py>=2.6 was needed); probably works also with 2.7, 3.0 and 3.2 (but not tested if it does);
is multiprocess-safe as well as thread-safe (proviously thread safety within a process was missed);
is based on public interfaces only (previously FileHandler._open() was called and overriden);
implement full RLock instance interface, as documented for threading.RLock (previously non-blocking mode and context-manager interface were missing).

The module contains:

Unix/Linux-only example implementation (with flock-based locking): FLockRLock and FLockFileHandler classes.
universal abstract classes -- which may be useful at developing implementation for non-Unix platforms: MultiprocessRLock, MultiprocessFileHandler, LockedFileHandler,

Also a quick-and-dirty test was added.

It is still an alpha version -- I'll be very grateful for any feedback.

Further updates:

2010-09-20: Some corrections, especially: non-blocking mode bug in MultiprocessRLock.acquire() fixed; _test() function improved; plus fixes in the description below.
2010-09-22: _test() improved and moved to description section. Mistaken copyright-notice removed.

Flexible observer pattern implementation (Python)

2012-12-06T19:23:11-08:00

Python recipe 576962 by Glenn Eychaner (event, observer, pattern, publish, subscribe, threadsafe). Revision 16.

A simple, flexible, general-purpose observer pattern.

Observers can be callable objects or objects with a particular named method (handle_notify() by default). Events can be any object, and observers can select which events they are interested in receiving. Support for a number of different types of lightweight event objects is included.