Michael Ilseman 5eb5e34897 [stdlib] Shims for UBreakIterator and thread local storage. ...

Introduce shims for using UBreakIterators from ICU. Also introduce
shims for using thread local storage via pthreads.

We will be relying on ICU and UBreakIterators for grapheme
breaking. But, UBreakIterators are very expensive to create,
especially for the way we do grapheme breaking, which is relatively
stateless. Thus, we will stash one or more into thread local storage
and reset it as needed.

Note: Currently, pthread_key_t is hard coded for a single platform
(Darwin), but I have a static_assert alongside directions on how to
adapt it to any future platforms who differ in key type.

2017-05-16 20:28:31 -07:00

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