eio

You can manage OCaml fiber lifecycles using structured concurrency with Switch.run, which orchestrates fibers and ensures deterministic cleanup and safe cancellation for concurrent network I/O operations.

The best way to test concurrent OCaml applications deterministically is using Eio_mock, which provides testing and mocking support for simulating file, network, and time operations without real side effects.

OCaml structured concurrency requires explicit capability passing for resources like net, clock, and fs to enforce safe resource handling, preventing unmanaged access and ensuring scalable asynchronous code.

Yes, you can build streaming pipelines and HTTP clients in OCaml using Eio integration patterns with cohttp-eio and bytesrw for robust data streaming and network operations.

You handle error propagation and cancellation across OCaml fibers using Eio primitives within Switch.run, which manages structured concurrency to safely cancel child fibers and propagate errors upstream.

You need switches for parallel data processing in OCaml because they provide structured concurrency to manage complex fiber lifecycles, whereas simple async tasks may not require explicit lifecycle boundaries.