Hi everybody,
 after I have seen that gcc since 4.9 has a working implementation of
atomics, I convinced myself to implement C11 threads within musl.

I was really amazed, in essence this was just work of several
hours. The cleanness of musl made it really a pleasant experience.

I think the implementation is straight forward, there are only very
few minor glitches possible. But I thought that I first discuss with
you.

Choices :

 - all types are just the corresponding POSIX types

Issues :

 - a lot of C11 are just weak symbols. to avoid polluting the link
   space of a C11 application, I had to transform a lot of POSIX
   function symbols into weak symbols, too.

 - the include file threads.h includes pthread.h, so the namespace of
   the C11 implementation is poluted with the pthreads stuff

 - pthread_create and thrd_create are still too tightly linked
   together. It would be good to split the corresponding file in two,
   but this would make maintenance a bit more difficult.

 - there are still some symbols missing, for some of the functions
   that I implemented as macro. work for a winter day

 - I don't have much tests for all of this


I join my version of the threads.h file that has some comments on the
minor choices.

Jens


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