async

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 create Async 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). Changes in 2.0.2: Add a Monad instance for Concurrently * Bump base dependency to allow 4.9 Changes in 2.0.1.6: Add workaround to waitCatch for #14 Changes in 2.0.1.5: Bump base dependencies for GHC 7.8 Changes in 2.0.1.4: Bump base dependency of test suite Changes in 2.0.1.3: Bump base dependency to allow 4.6 Changes in 2.0.1.2: Bump stm dependency to 2.4 Changes in 2.0.1.1: Safe Haskell support: Control.Concurrent.Async is now Trustworthy Changes in 2.0.1.0: Added a Functor instance for Async Added asyncBound, asyncOn, asyncWithUnmask, asyncOnWithUnmask, withAsyncBound, withAsyncOn, withAsyncWithUnmask, withAsyncOnWithUnmask. Added mapConcurrently Added Concurrently (with Applicative and Alternative instances)