[PATCH] D29818: [libcxx] Threading support: Attempt to externalize system_clock::now() and steady_clock::now() implementations

[Asiri Rathnayake via Phabricator via cfe-commits]

rmaprath created this revision.

These implementations depend heavily on the underlying platform. It would be good to put them behind a porting function within the threading API as quite a bit of threading functionality depend on the clocks.

The `steady_clock::now()` implementation was difficult to pluck out for `__APPLE__` because it uses some static functions within the library sources.

I have tested these changes on linux, I will test them on Windows and Mac before committing (if this gets approved).


https://reviews.llvm.org/D29818

Files:
  include/__threading_support
  src/chrono.cpp

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