Concurrent Haskell extends[1] Haskell 98 with explicit concurrency. Its two main underlying concepts are:
A primitive type MVar α implementing a bounded/single-place asynchronous channel, which is either empty or holds a value of type α.
The ability to spawn a concurrent thread via the forkIO primitive.
Built atop this is a collection of useful concurrency and synchronisation abstractions[2] such as unbounded channels, semaphores and sample variables.
Haskell threads have very low overhead: creation, context-switching and scheduling are all internal to the Haskell runtime. These Haskell-level threads are mapped onto a configurable number of OS-level threads, usually one per processor core.
^Simon Peyton Jones, Andrew D. Gordon, and Sigbjorn Finne. Concurrent Haskell. ACM SIGPLAN-SIGACT Symposium on Principles of Programming Languages (PoPL). 1996. (Some sections are out of date with respect to the current implementation.)
^The Haskell Hierarchical Libraries, Control.Concurrent Archived 2012-08-02 at archive.today
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