Life & fun · alternatives · 2026

24 alternatives to A concurrent thread-safe hash map implemented in C++

A concurrent thread-safe hash map implemented in C++ - kshk123/hashMap

A thread-safe hash map library written in C++ that allows multiple threads to safely access and modify data simultaneously without conflicts. It is designed for developers building concurrent applications who need… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. A concurrent thread-safe hash map implemented in C++ launched in 2017; newer entries below may have overtaken it.

1
A hash array-mapped trie implementation in C▲171
Long-simmering side project that is finally ready to see the light. HAMTs are a cool persistent data structure and implementing one has been a lot of fun. Beyond the code, there is likely some value in the extensive and largely complete implementation docs; basic benchmarks are linked in the README, too. Kind of aiming to be "the libavl for HAMTs". That is obviously a high and aspirational bar but a distinct possibility if it stirs up a little interest and/or contribution. Anyways, it's time for this to go out, collect feedback and maybe even some use outside of toy projects. Let me…
2023 · github.com · its alternatives →
2
A portable hash map in C▲176
A small, portable, linear probing hash map. Contribute to e-dant/salmagundi development by creating an account on GitHub.
2024 · github.com · its alternatives →
3
A Lock- and wait-free hashtable (and an array too), written in C▲24
📶 A lock- and wait-free hashtable (and an array too) - mulle-concurrent/mulle-concurrent
2016 · github.com · its alternatives →
4
Whirlwind – Async concurrent hashmap for Rust▲140
Hey HN, this is Will and David from Fortress (https://news.ycombinator.com/item?id=41426998). We use a lot of async Rust internally, and created this library out of a need for an async-aware concurrent hashmap since there weren’t many available in the Rust ecosystem. Whirlwind is a sharded HashMap with a fully asynchronous API. Just as dashmap is a replacement for std::sync::RwLock, whirlwind aims to be a replacement for tokio::sync::RwLock. It has a similar design and performance characteristics to dashmap, but seems to perform better in read-heavy workloads with tokio's…
2024 · github.com · its alternatives →
5
A pure C89 implementation of Go channels, with blocking selects▲271
A pure C (-std=c89) implementation of Go channels, including blocking and non-blocking selects. - GitHub - rochus-keller/CspChan: A pure C (-std=c89) implementation of Go channels, including blocking and non-blocking selects.
2023 · github.com · its alternatives →
6
Integer Map Data Structure▲91
This project presents a new data structure for storing ordered integer maps. The proposed data structure is a compressive, cache-friendly, radix tree that has performance comparable to an unordered map (`std::unordered_map`) and is an order of magnitude faster than an ordered map (`std::map`).
2024 · github.com · its alternatives →
7
Hydrogen, a multithread non-blocking Linux server framework in Rust▲154
Multithreaded, non-blocking Linux server framework in Rust - nathansizemore/hydrogen
2016 · github.com · its alternatives →
8AS
A Simple GPU Hash Table▲119
A Simple GPU Hash Table
2020 · nosferalatu.com · its alternatives →
9
A thread hierarchy management library in C▲53
Non-preemptive Thread Hierarchy Manager. Contribute to gueststar/nthm development by creating an account on GitHub.
2020 · github.com · its alternatives →
10
Coros – A Modern C++ Library for Task Parallelism▲129
Hello Hacker News. I’m Martin, a graduate student from Prague, and I’ve been working on Coros, a C++ library for task-based parallelism. After spending some time with OpenMP and oneTBB, I wanted to try building a library using modern features from the C++ standard library. I’ve used coroutines for task encapsulation and C++23 expected for exception handling, while trying to maintain good performance. Additionally, I’ve implemented monadic-like behavior to allow easy chaining of tasks, similar to the monadic operations in std::expected. You can check out the project here:…
2024 · github.com · its alternatives →
11
Array with Constant Time Access and Fast Insertion and Deletion▲300
Contribute to igushev/IgushArray development by creating an account on GitHub.
2019 · github.com · its alternatives →
12UC
uThreads – Concurrent User Threads in C and C++▲135
2016 · samanbarghi.com · its alternatives →
13
Simple Hash Table Implementation for C▲42
Simple hash table implementation for C. Contribute to watmough/jwHash development by creating an account on GitHub.
2015 · github.com · its alternatives →
14
Neco – Coroutine Library for C▲145
Concurrency library for C (coroutines). Contribute to tidwall/neco development by creating an account on GitHub.
2024 · github.com · its alternatives →
15
CXXStateTree – A modern C++ library for hierarchical state machines▲48
Hi HN! I've built [CXXStateTree](https://github.com/ZigRazor/CXXStateTree), a modern C++ header-only library to create hierarchical state machines with clean, intuitive APIs. It supports: - Deeply nested states - Entry/exit handlers - State transitions with guards and actions - Asynchronous transitions with `co_await` (C++20 coroutines) - Optional runtime type identification for flexibility It's ideal for complex control logic, embedded systems, games, robotics, and anywhere you'd use a finite state machine. I’d love feedback, use cases, or contributions from the…
2025 · github.com · its alternatives →
16
Rain hashes – well designed, simple and fast variable sized hashes▲79
The fastest 128-bit and 256-bit hash, passes all tests, and under 140 source lines of code. API library and CLI tool in C++ and NodeJS/Wasm - DOSAYGO-STUDIO/rain
2024 · github.com · its alternatives →
17
A Golang Package for Consistent Hashing with Bounded Loads▲50
A Go library that implements Consistent Hashing and Consistent Hashing With Bounded Loads. - lafikl/consistent
2017 · github.com · its alternatives →
18
A Fast, Malloc-Free C++14 Json Parser and Encoder▲98
Meta programming utilities for C++14. Merged in matt-42/lithium - matt-42/iod
2014 · github.com · its alternatives →
19
Chan – pure C implementation of Go channels▲150
Pure C implementation of Go channels. Contribute to tylertreat/chan development by creating an account on GitHub.
2014 · github.com · its alternatives →
20
Evenk C++ concurrency library▲35
A C++ library for concurrent programming. Contribute to ademakov/Evenk development by creating an account on GitHub.
2015 · github.com · its alternatives →
21
Libconcurrent – Coroutines in C▲91
:copyright: Concurrent Programming Library (Coroutine) for C11 - sharow/libconcurrent
2016 · github.com · its alternatives →
22
A header only C++11 LRU Cache template class, with no dependencies▲29
A header only C++11 LRU Cache template class that allows you to define key, value and optionally the Map type. uses a double linked list and a std::unordered_map style container to provide fast insert, delete and update No dependencies other than the C++ standard library. This is a C++11 remake of m
2016 · github.com · its alternatives →
23
A simple GPU hash table that can process 300M+ operations/second▲8
A simple GPU hash table implemented in CUDA using lock free techniques - nosferalatu/SimpleGPUHashTable
2020 · github.com · its alternatives →
24
LazyCode – C++14 composable, lazily evaluated map, filter, fold▲66
C++14: bringing in those expressions that you wish you had, Lazily evaluated, compossible generators, maps, filters, ranges and more... - GitHub - SaadAttieh/lazyCode: C++14: bringing in those expressions that you wish you had, Lazily evaluated, compossible generators, maps, filters, ranges and more
2018 · github.com · its alternatives →

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