Simon Willison’s Weblog

29th July 2007 - Link Blog

Thread Synchronization Mechanisms in Python. Locks, RLocks, Semaphores, Events and Conditions as explained by Fredrik Lundh.

Posted 29th July 2007 at 9:32 pm

Recent articles

Experimenting with Starlette 1.0 with Claude skills - 22nd March 2026
Profiling Hacker News users based on their comments - 21st March 2026
Thoughts on OpenAI acquiring Astral and uv/ruff/ty - 19th March 2026

This is a link post by Simon Willison, posted on 29th July 2007.

conditions 1 effbot 4 events 108 fredrik-lundh 7 locks 1 python 1235 rlocks 1 semaphores 1 threads 18 tutorial 18

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe