concdt

concdt is an open‑source library designed to provide efficient, thread‑safe concurrent data structures for modern programming languages. Initially released in 2021 under the Apache License 2.0, the project aims to reduce the overhead associated with locking mechanisms by leveraging lock‑free algorithms such as compare‑and‑swap (CAS), single‑writer/multiple‑reader (SWMR) patterns, and atomic reference counting. The library is written primarily in Rust but includes bindings for C++ and Python, allowing developers to integrate concurrent collections into a variety of codebases without sacrificing performance or safety.

Key features of concdt include a concurrent hash map, a lock‑free queue, a wait‑free stack, and utilities for atomic reference counting. All structures expose a minimal API that mirrors the standard library's collections, enabling easy migration of existing code. The library also provides a testing harness that measures contention, latency, and throughput under multi‑threaded workloads, helping users to benchmark and tune their applications. Additionally, concdt offers a 'nogc' mode in which garbage collection is disabled, making it suitable for long‑running services where memory reclamation needs to be deterministic.

The development community consists of academics, system engineers, and open‑source contributors. Updates are released quarterly, and the project actively tracks issues on GitHub, encouraging pull requests for new concurrent patterns. concdt has been cited in several research papers on concurrent programming and is implemented in a number of high‑performance servers, such as distributed key‑value stores and real‑time analytics platforms.