igrigorik/em-synchrony

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1035 stars · 145 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A Ruby library providing Fiber-aware EventMachine clients and convenience primitives such as connection pools, iterators, and synchronization classes. It lets developers write evented, non-blocking code in a synchronous style using Ruby Fibers.

Use cases

• write async eventmachine code without callback nesting
• fiber-aware connection pooling for mysql2 or redis
• run concurrent http requests with em-http-request in synchronous style
• control concurrency when iterating over async tasks
• convert callback-based async functions into synchronous calls
• use fiber-aware mutex, condition variables, and threads

When to choose

• you maintain a legacy Ruby EventMachine codebase that already uses em-synchrony
• you need synchronous-style code on top of EventMachine clients in Ruby
• you want fiber-based concurrency control primitives in Ruby

When to avoid

• starting a new Ruby project - prefer modern async gems like async or concurrent-ruby
• you are not using EventMachine as your reactor
• you need actively maintained software with recent releases

Facets

library · maturity maintenance

concurrency http-client database-driver caching message-queue developer-tools backend networking ruby eventmachine fibers async reactor-pattern connection-pool ruby-gem linux macos

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