majnemer added a comment.

In https://reviews.llvm.org/D28226#634282, @compnerd wrote:

> The dynamic behavior only is used for Windows, not pthreads.  So, we dont see 
> it here, but it becomes apparent in the windows support.  I was trying to 
> minimize the changes to libc++ itself to avoid having it to consider the 
> recursive vs non-recursive cases.  If the libc++ maintainers would prefer to 
> expand the interfaces rather than use the dynamic behavior, Im fine with that 
> approach too.


Another argument that I forgot to mention: `__libcpp_condvar_wait` and 
`__libcpp_condvar_timedwait` are only expected to work with non-recursive 
mutexes. I feel that this overwidens the API surface. Flattening it out removes 
the dynamic behavior and makes it clear what operations needs to support what 
types of mutexes.


Repository:
  rL LLVM

https://reviews.llvm.org/D28226



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