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Microsoft's new F# programming language provides the powerful combination of functional programming (first-class lexical closures and tail calls) with an efficient concurrent garbage collector that makes it easy to leverage multicores.
OCaml, Haskell, Erlang and all free Lisp and Scheme implementations that I know of do not have concurrent GCs. Scala and Clojure have a concurrent GC but no tail calls.
So there appear to be no open source programming languages that combine these features. Is that correct?
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Garbage collection (GC) is a memory recovery feature built into programming languages such as C# and Java.
Concurrent garbage collection enables interactive applications to be more responsive by minimizing pauses for a collection. Managed threads can continue to run most of the time while the concurrent garbage collection thread is running. This design results in shorter pauses while a garbage collection is occurring.
Garbage collection is the process in which programs try to free up memory space that is no longer used by objects. Garbage collection is implemented differently for every language. Most high-level programming languages have some sort of garbage collection built in.
Primitive programming languages like C and C++ do not have their garbage collection instead expect the developer to not only allocate the object but also deallocate it explicitly. Hence we see the functions like "malloc" and "free".
Erlang has a shared nothing model where each process has it's own garbage collector. Whether you consider that to be no concurrency or not it's up to you. But it sure scales very well as the number of processes goes up.
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Latest version of GHC supports parallel GC. See the release notes.
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