/*!
@function SecTrustKeychainsGetMutex
@abstract Get the global mutex for accessing trust keychains during an evaluation
- @param result On return, a reference to the global mutex which manages access to trust keychains
+ @return On return, a reference to the global mutex which manages access to trust keychains
@discussion This function is intended to be used by C++ implementation layers to share a
common global mutex for managing access to trust keychains (i.e. the root certificate store).
*/