threading support in compiler^library

Not sure what POSIX falls into. OS-level library?

Java (followed by c#) absorbed many concurrency features into the compiler, by adding language keywords. Is this related to the VM? I think so. Is The library approach still necessary in the presence of VM? Yes. confirmed that jvm uses pthreads on linux and macOS.

Python, perl and most languages have no VM and use the common add-on “library” approach. The library is usually a wrapper over C threading library.

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