Fast Re-entrant Optimistic Lock

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library 0.8.3 ·python
verified May 21, 2026

Fastrlock is a C-level implementation of a re-entrant, optimistic lock for CPython, serving as a drop-in replacement for `threading.RLock`. Implemented in Cython, it offers both a Python and a C-API, designed to optimize for non-congested locking scenarios. It is actively maintained with periodic updates to support newer Python versions, with its current version being 0.8.3.

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