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If you agree with Hans Boehm, "Threads Cannot be Implemented as a Library": http://www.hpl.hp.com/techreports/2004/HPL-2004-209.pdf

The C11 standard added concurrency primitives to the language.

Interesting. Do you know what the tool support is like? What compilers implement it, if debuggers support it, etc.

tool support is pretty much non-existent. expect it to have the same amount of tooling and support as pthreads.