async: Run IO operations asynchronously and wait for their results

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).

Modules

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Flags

Manual Flags

Name	Description	Default
debug-auto-label	Strictly for debugging as it might have a non-negligible overhead. Enabling this flag will auto-label the threads spawned by async. Use it to find where are unlabelled threads spawned in your program (be it your code or dependency code).	Disabled

Automatic Flags

Name	Description	Default
bench		Disabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

Downloads

• async-2.2.6.tar.gz [browse] (Cabal source package)
• Package description (as included in the package)

Maintainer's Corner

Package maintainers

• PeterSimons, SimonMarlow

For package maintainers and hackage trustees

• edit package information

Candidates

• 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5