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Evan Wilde 1a546a9ccb [FreeBSD]: Optional observation pthread primitives
The pthread APIs on FreeBSD do not include nullability APIs so the
pthread mutex APIs are imported as pointers to optional values.
Other platforms include nullability APIs and import the pthread APIs as
pointers to the mutex. Splitting the locking primitive type based on the
OS.

Fixes: rdar://150880976
2025-05-09 10:08:35 -07:00
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