Function aeron_archive_persistent_subscription_context_get_join_difference_counter 

pub unsafe extern "C" fn aeron_archive_persistent_subscription_context_get_join_difference_counter(
    context: *mut aeron_archive_persistent_subscription_context_t,
) -> *mut aeron_counter_t

Get the counter for tracking the join difference of the persistent subscription.

@param context to query. @return the join difference counter. @see aeron_archive_persistent_subscription_context_set_join_difference_counter