# Extensions

The following extensions are available globally.

- `os_unfair_lock_s`
  See more

  #### Declaration

  Swift

      extension os_unfair_lock_s

- `_opaque_pthread_rwlock_t`
  See more

  #### Declaration

  Swift

      extension _opaque_pthread_rwlock_t

- `NSLocking`
  See more

  #### Declaration

  Swift

      extension NSLocking

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