Function transmission_sys::tr_torrentSetCompletenessCallback

pub unsafe extern "C" fn tr_torrentSetCompletenessCallback(
    torrent: *mut tr_torrent, 
    func: tr_torrent_completeness_func, 
    user_data: *mut c_void
)

Register to be notified whenever a torrent's "completeness" changes. This will be called, for example, when a torrent finishes downloading and changes from TR_LEECH to either TR_SEED or TR_PARTIAL_SEED.

func is invoked FROM LIBTRANSMISSION'S THREAD! This means func must be fast (to avoid blocking peers), shouldn't call libtransmission functions (to avoid deadlock), and shouldn't modify client-level memory without using a mutex!

@see tr_completeness