[PATCH] Add c++2a binary_semaphore

[Sebastian Huber]

Hello Thomas,

some operating systems provide already an implementation of binary 
semaphores with a compatible API, e.g. RTEMS. It would be nice if I 
could use it in libstdc++. I guess you don't want to have #ifdef 
__rtems__ stuff in this code. What about defining a binary semaphore API 
for gthr.h and then implement the optional futex support in 
libgcc/gthr-posix.h?

-- 
Sebastian Huber, embedded brains GmbH

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