async (original) (raw)

Maintained by Simon Marlow

This version can be pinned in stack with:async-2.2.5@sha256:b7648c6165729a973d95cb328f9fd874813a81c727707e8b2552b4f03399763b,3366

Module documentation for 2.2.5

• Control
  • Control.Concurrent
    * Control.Concurrent.Async
    * Control.Concurrent.Async.Internal

This package provides a higher-level interface over threads, in which an Async a is a concurrent thread that will eventually deliver a value of type a. The package provides ways to createAsync computations, wait for their results, and cancel them.

Using Async is safer than using threads in two ways:

• When waiting for a thread to return a result, if the thread dies with an exception then the caller must either re-throw the exception (wait) or handle it (waitCatch); the exception cannot be ignored.
• The API makes it possible to build a tree of threads that are automatically killed when their parent dies (see withAsync).